阅读说明：本技术 一种公路混凝土用高效缓凝减水剂及其制备方法 (High-efficiency retarding water reducer for highway concrete and preparation method thereof ) 是由 丁一飞 张振兴 赵汪洋 刘洪磊 郭芳芳 于 2020-12-16 设计创作，主要内容包括：本发明涉及减水剂技术领域,尤其涉及一种公路混凝土用高效缓凝减水剂及其制备方法,该公路混凝土用高效缓凝减水剂包括以下组分：异丁烯醇聚氧乙烯醚、马来酸酐、α-甲基丙烯酸、烯丙基三甲基氯化铵、过硫酸氨、抗坏血酸、木质素磺酸钙、过氧化氢、酸调节剂、碱调节剂和蒸馏水。本发明通过分子设计,在聚羧酸减水剂分子中引入较多的-COO～-,使得减水剂的缓凝效果得到加强,使用α-甲基丙烯酸代替丙烯酸,降低单体自聚程度。通过添加还原剂抗坏血酸,使得反应体系温度由80℃左右降低至室温,在性能基本不变的情况下降低能耗。通过添加改性木质素磺酸钙,使得聚羧酸减水剂在性能损失较小的情况下大幅度降低合成成本。(The invention relates to the technical field of water reducing agents, in particular to a high-efficiency retarding water reducing agent for highway concrete and a preparation method thereof, wherein the high-efficiency retarding water reducing agent for the highway concrete comprises the following components: isobutylene alcohol polyoxyethylene ether, maleic anhydride,Alpha-methacrylic acid, allyl trimethyl ammonium chloride, ammonium persulfate, ascorbic acid, calcium lignosulfonate, hydrogen peroxide, an acid regulator, an alkali regulator and distilled water. The invention introduces more-COO into the polycarboxylate superplasticizer molecules through molecular design ‑ So that the retarding effect of the water reducing agent is enhanced, and the self-polymerization degree of the monomer is reduced by using the alpha-methacrylic acid to replace acrylic acid. The temperature of a reaction system is reduced from about 80 ℃ to room temperature by adding a reducing agent ascorbic acid, and the energy consumption is reduced under the condition of basically unchanged performance. By adding the modified calcium lignosulphonate, the synthesis cost of the polycarboxylic acid water reducing agent is greatly reduced under the condition of less performance loss.)

1. The high-efficiency retarding water reducer for the highway concrete is characterized by comprising the following components: the water-soluble polymer comprises (1) isobutylene alcohol polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride, ammonium persulfate, ascorbic acid, calcium lignosulfonate, hydrogen peroxide, an acid regulator, an alkali regulator and distilled water; wherein the content of the first and second substances,

the mol ratio of four monomers of the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride is 1: 1.2-1.4: 2.2-2.4: 1.2-1.5;

the mass of the ammonium persulfate is 3.2-4.4% of the total mass of the monomers, and the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.20-1.30;

the mass ratio of the calcium lignosulphonate to the hydrogen peroxide is 8-12: 1; the total mass of the calcium lignosulphonate and the hydrogen peroxide is 10-30% of the total mass of the monomers.

2. The high-efficiency retarding water reducer for highway concrete according to claim 1, which is characterized in that: the mol ratio of four monomers of the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride is 1: 1.3: 2.3: 1.4.

3. the high-efficiency retarding water reducer for highway concrete according to claim 1, which is characterized in that: the mass of the ammonium persulfate is 3.8 percent of the total mass of the monomers.

4. The high-efficiency retarding water reducer for highway concrete according to claim 1, which is characterized in that: the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.25.

5. The high-efficiency retarding water reducer for highway concrete according to claim 1, which is characterized in that: the acid regulator is sulfuric acid, and the alkali regulator is sodium hydroxide.

6. The high-efficiency retarding water reducer for highway concrete according to claim 1, which is characterized in that: the mixing amount of the high-efficiency retarding water reducer is 0.2-0.4% of the mass of the cement.

7. A preparation method of a high-efficiency retarding water reducer for highway concrete is characterized by comprising the following steps:

1) according to the mass ratio of 1: 1.5-2.0, weighing lignin transverse calcium and distilled water, adding the lignin transverse calcium and the distilled water into a 250ml three-neck flask, placing the mixture into a magnetic stirring constant-temperature oil bath kettle with a condensation reflux device at a test temperature, stirring and dissolving the mixture, adjusting the pH of the solution to 3.6-4.1 by using an acid regulator, keeping the temperature at 80 ℃ for 0.2-0.5h, dropwise adding a hydrogen peroxide solution, and reacting the solution at 74-78 ℃ for 3-4h to obtain an oxidation modified lignin transverse calcium solution;

2) adding a certain mass of isobutylene alcohol polyoxyethylene ether and distilled water into a 250ml three-neck flask, placing the three-neck flask into a constant-temperature oil bath kettle with magnetic stirring at a test temperature, stirring and dissolving, slowly dropwise adding a small monomer solution prepared from maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride and distilled water, a certain mass of oxidation modified wood calcium abscisic acid aqueous solution, an initiator solution prepared from ammonium persulfate and distilled water, and a reducing agent solution prepared from ascorbic acid and distilled water at the same time after constant temperature, and keeping the temperature for 0.5-1h at 30-40 ℃ after dropwise adding; after the reaction is finished, the temperature is reduced to room temperature, and the pH is adjusted to 7.1-7.3 by using an alkali regulator, so that the high-efficiency retarding water reducer product is obtained.

8. The preparation method of the high-efficiency retarding and water reducing agent for the road concrete according to claim 7 is characterized by comprising the following steps: in the step 1), the mass ratio of 1: 1.8 weighing calcium lignosulphonate and distilled water.

9. The preparation method of the high-efficiency retarding and water reducing agent for the road concrete according to claim 7 is characterized by comprising the following steps: in the step 2), the initiator solution and the reducing agent solution are simultaneously dripped for 1-2 h.

10. The preparation method of the high-efficiency retarding and water reducing agent for the road concrete according to claim 7 is characterized by comprising the following steps: in the step 2), the mass sum of the oxidized modified calcium ligninsulfonate in the oxidized modified calcium ligninsulfonate aqueous solution is 10-30% of the total mass of the monomers, the monomers comprise isobutylene polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid and allyl trimethyl ammonium chloride, and the molar ratio of the four is 1: 1.2-1.4: 2.2-2.4: 1.2-1.5.

Technical Field

The invention relates to the technical field of water reducing agents, and particularly relates to a high-efficiency retarding water reducing agent for highway concrete and a preparation method thereof.

Background

Concrete construction often requires that the setting time of the concrete be delayed in order to facilitate the construction operation and to ensure the quality of the concrete. In hot day concrete construction, the temperature is high, concrete setting is accelerated, slump loss is accelerated, the fluidity is lost quickly, construction is difficult, engineering quality is affected, and therefore the concrete is required to have longer setting time. The construction of mass concrete needs to prolong the setting time of the concrete, delay the hydration heat release process and reduce the cracks generated by temperature stress, and all of the concrete needs to be added with retarder to improve the performance of the concrete.

The retarder is an additive capable of prolonging the setting time of concrete, and is mainly used for delaying the hydration hardening speed of cement so that the freshly mixed concrete can keep plasticity for a long time, thereby being beneficial to the transportation, pouring and vibration of the concrete; the time of occurrence of a hydration temperature peak can be delayed, the hydration temperature peak value is reduced, and the temperature crack of mass concrete is prevented; the adaptability of the high-efficiency water reducing agent and cement can be adjusted, and the slump loss of concrete mixtures is reduced. The retarder has different components and different retarding mechanisms on concrete. The retarding mechanism of the retarder on cement includes: the precipitation hypothesis, the salt-complexing hypothesis, the adsorption hypothesis and the nucleation generation hypothesis are used, and the core is to hinder the hydration of cement and water, so that the aim of retarding coagulation is fulfilled.

Along with the development of economy, the investment scale of infrastructure construction in China is continuously improved, a large amount of concrete is required for the construction of the infrastructure, sand and stone are important components in the concrete, thereby improving the consumption of the sandstone year by year, leading the common high-quality river sand to have large-scale shortage, leading the prior polycarboxylic acid water reducing agent to have inappropriateness phenomenon because the river sand with higher mud content or the machine-made sand is used in many places, the quality of the concrete is seriously reduced, mainly because the main components of the mud in the sand are clay such as montmorillonite, kaolin and the like, the absorption to the polycarboxylic acid water reducing agent is very strong, the saturated adsorption capacity is about 3-4 times of that of cement, when the sand and stone contain a large amount of mud, the clay in the mud can adsorb a large amount of polycarboxylic acid water reducing agent, so that the concrete has the phenomena of sharply reduced fluidity and accelerated loss.

The existing retarding and water reducing agent for highway concrete has the defects in the use process, and firstly, the retarding effect is not ideal, and the production cost is higher; and secondly, the mud resistance effect is not ideal, and the adsorption capacity of the clay to the polycarboxylic acid water reducing agent cannot be reduced.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a high-efficiency retarding water reducer for highway concrete and a preparation method thereof.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

the high-efficiency slow-setting water reducer for the highway concrete comprises the following components: the water-soluble polymer comprises (1) isobutylene alcohol polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride, ammonium persulfate, ascorbic acid, calcium lignosulfonate, hydrogen peroxide, an acid regulator, an alkali regulator and distilled water; wherein the content of the first and second substances,

the mol ratio of four monomers of the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride is 1: 1.2-1.4: 2.2-2.4: 1.2-1.5;

the mass of the ammonium persulfate is 3.2-4.4% of the total mass of the monomers, and the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.20-1.30;

the mass ratio of the calcium lignosulphonate to the hydrogen peroxide is 8-12: 1; the total mass of the calcium lignosulphonate and the hydrogen peroxide is 10-30% of the total mass of the monomers.

Further, in the high-efficiency retarding and water reducing agent for road concrete, the molar ratio of four monomers, namely the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride, is 1: 1.3: 2.3: 1.4.

further, in the high-efficiency retarding and water-reducing agent for highway concrete, the mass of the ammonium persulfate is 3.8% of the total mass of the monomers.

Further, in the high-efficiency retarding and water-reducing agent for road concrete, the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.25.

Further, in the high-efficiency retarding water reducing agent for highway concrete, the acid regulator is sulfuric acid, and the alkali regulator is sodium hydroxide.

Further, in the high-efficiency retarding water reducing agent for highway concrete, the mixing amount of the high-efficiency retarding water reducing agent is 0.2-0.4% of the mass of cement.

A preparation method of a high-efficiency retarding water reducer for highway concrete comprises the following steps:

1) according to the mass ratio of 1: 1.5-2.0, weighing lignin transverse calcium and distilled water, adding the lignin transverse calcium and the distilled water into a 250ml three-neck flask, placing the mixture into a magnetic stirring constant-temperature oil bath kettle with a condensation reflux device at a test temperature, stirring and dissolving the mixture, adjusting the pH of the solution to 3.6-4.1 by using an acid regulator, keeping the temperature at 80 ℃ for 0.2-0.5h, dropwise adding a hydrogen peroxide solution, and reacting the solution at 74-78 ℃ for 3-4h to obtain an oxidation modified lignin transverse calcium solution;

2) adding a certain mass of isobutylene alcohol polyoxyethylene ether and distilled water into a 250ml three-neck flask, placing the three-neck flask into a constant-temperature oil bath kettle with magnetic stirring at a test temperature, stirring and dissolving, slowly dropwise adding a small monomer solution prepared from maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride and distilled water, a certain mass of oxidation modified wood calcium abscisic acid aqueous solution, an initiator solution prepared from ammonium persulfate and distilled water, and a reducing agent solution prepared from ascorbic acid and distilled water at the same time after constant temperature, and keeping the temperature for 0.5-1h at 30-40 ℃ after dropwise adding; after the reaction is finished, the temperature is reduced to room temperature, and the pH is adjusted to 7.1-7.3 by using an alkali regulator, so that the high-efficiency retarding water reducer product is obtained.

Further, the preparation method of the high-efficiency retarding and water-reducing agent for the highway concrete comprises the following steps in step 1) according to the mass ratio of 1: 1.8 weighing calcium lignosulphonate and distilled water.

Further, in the preparation method of the high-efficiency retarding water reducer for the highway concrete, in the step 2), the initiator solution and the reducing agent solution are simultaneously dripped for 1-2 hours.

Further, in the preparation method of the high-efficiency retarding water reducing agent for highway concrete, in the step 2), the total mass of the oxidized modified calcium lignocellate in the oxidized modified calcium lignocellate aqueous solution is 10-30% of the total mass of the monomers, the monomers comprise isobutenol polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid and allyl trimethyl ammonium chloride, and the molar ratio of the four is 1: 1.2-1.4: 2.2-2.4: 1.2-1.5.

The invention has the beneficial effects that:

1. the invention introduces more-COO into the polycarboxylate superplasticizer molecules through molecular design^-So that the retarding effect of the water reducing agent is enhanced, and the self-polymerization degree of the monomer is reduced by using the alpha-methacrylic acid to replace acrylic acid. The temperature of a reaction system is reduced from about 80 ℃ to room temperature by adding a reducing agent ascorbic acid, and the energy consumption is reduced under the condition of basically unchanged performance. By adding the modified calcium lignosulphonate, the synthesis cost of the polycarboxylic acid water reducing agent is greatly reduced under the condition of less performance loss.

2. According to the invention, the molecular structure of the polycarboxylate superplasticizer is redesigned, and the macromonomer isobutylene polyoxyethylene ether with ultrahigh molecular weight (Mn 8000) is selected, so that the length of the side chain of the polycarboxylate superplasticizer molecule is greatly increased, the steric hindrance effect of the polycarboxylate superplasticizer molecule is increased, and the side chain of the polycarboxylate superplasticizer is difficult to enter the intercalation of clay molecules. In addition, during the synthesis process of the polycarboxylic acid water reducing agent, allyl trimethyl ammonium chloride is selected as a functional monomer, so that a cationic group is introduced into a molecular structure, the cationic group can inhibit the expansion of clay, the distance between clay intercalation layers is reduced, the adsorption capacity of the clay on the polycarboxylic acid water reducing agent is reduced, and the effect of resisting the clay is finally achieved.

Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The high-efficiency slow-setting water reducer for the highway concrete comprises the following components: the water-soluble polymer comprises (1) isobutylene alcohol polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride, ammonium persulfate, ascorbic acid, calcium lignosulfonate, hydrogen peroxide, an acid regulator, an alkali regulator and distilled water; wherein the content of the first and second substances,

the mol ratio of four monomers of the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride is 1: 1.3: 2.3: 1.4;

the mass of the ammonium persulfate is 3.8 percent of the total mass of the monomers, and the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.25;

the mass ratio of the calcium lignosulphonate to the hydrogen peroxide is 10: 1; the total mass of the calcium lignosulfonate and the hydrogen peroxide is 15 percent of the total mass of the monomers.

The acid regulator is sulfuric acid, and the alkali regulator is sodium hydroxide.

The embodiment also provides a preparation method of the high-efficiency retarding water reducer for the highway concrete, which comprises the following steps:

1) according to the mass ratio of 1: 1.8 weighing transverse calcium lignin and distilled water, adding the transverse calcium lignin and the distilled water into a 250ml three-neck flask, placing the three-neck flask in a magnetic stirring constant-temperature oil bath with a condensation reflux device at a test temperature, stirring and dissolving, adjusting the pH of the solution to 3.8 by using an acid regulator, keeping the temperature at 80 ℃ for 0.3h, dropwise adding a hydrogen peroxide solution, and reacting at 76 ℃ for 3.5h to obtain an oxidized modified transverse calcium lignin solution;

2) adding a certain mass of isobutylene polyoxyethylene ether and distilled water into a 250ml three-neck flask, placing the three-neck flask into a constant-temperature oil bath kettle with magnetic stirring at a test temperature, stirring and dissolving, slowly dropwise adding a small monomer solution prepared from maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride and distilled water, a certain mass of oxidation modified wood calcium abscisic acid aqueous solution, an initiator solution prepared from ammonium persulfate and distilled water, and a reducing agent solution prepared from ascorbic acid and distilled water at the same time, and dropwise adding the initiator solution and the reducing agent solution at the same time for 1.5 h; after the dropwise addition, preserving the heat for 0.7h at 35 ℃; and after the reaction is finished, cooling the temperature to room temperature, and adjusting the pH to 7.2 by using an alkali regulator to obtain the high-efficiency retarding water reducer product.

Example 2

The high-efficiency slow-setting water reducer for the highway concrete comprises the following components: the water-soluble polymer comprises (1) isobutylene alcohol polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride, ammonium persulfate, ascorbic acid, calcium lignosulfonate, hydrogen peroxide, an acid regulator, an alkali regulator and distilled water; wherein the content of the first and second substances,

the mol ratio of four monomers of the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride is 1: 1.2: 2.4: 1.2;

the mass of the ammonium persulfate is 3.2 percent of the total mass of the monomers, and the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.20;

the mass ratio of the calcium lignosulphonate to the hydrogen peroxide is 12: 1; the total mass of the calcium lignosulfonate and the hydrogen peroxide is 10 percent of the total mass of the monomers.

The acid regulator is sulfuric acid, and the alkali regulator is sodium hydroxide.

The embodiment also provides a preparation method of the high-efficiency retarding water reducer for the highway concrete, which comprises the following steps:

1) according to the mass ratio of 1: 1.5 weighing lignin transverse calcium and distilled water, adding the lignin transverse calcium and the distilled water into a 250ml three-neck flask, placing the mixture into a magnetic stirring constant-temperature oil bath kettle with a condensation reflux device at a test temperature, stirring and dissolving the mixture, adjusting the pH of the solution to be 3.6 by using an acid regulator, keeping the temperature of 80 ℃ for 0.2h, dropwise adding a hydrogen peroxide solution, and reacting the solution at the temperature of 74 ℃ for 4h to obtain an oxidation modified lignin transverse calcium solution;

2) adding a certain mass of isobutenol polyoxyethylene ether and distilled water into a 250ml three-neck flask, placing the three-neck flask in a constant-temperature oil bath kettle with magnetic stirring at a test temperature, stirring and dissolving, slowly dropwise adding a small monomer solution prepared from maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride and distilled water, a certain mass of oxidation modified wood calcium abscisic acid aqueous solution, an initiator solution prepared from ammonium persulfate and distilled water, and a reducing agent solution prepared from ascorbic acid and distilled water at the same time, and dropwise adding the initiator solution and the reducing agent solution at the same time for 1 h; after the dropwise addition, preserving the heat for 1h at 30 ℃; and after the reaction is finished, cooling the temperature to room temperature, and adjusting the pH to 7.3 by using an alkali regulator to obtain the high-efficiency retarding water reducer product.

Example 3

The high-efficiency slow-setting water reducer for the highway concrete comprises the following components: the water-soluble polymer comprises (1) isobutylene alcohol polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride, ammonium persulfate, ascorbic acid, calcium lignosulfonate, hydrogen peroxide, an acid regulator, an alkali regulator and distilled water; wherein the content of the first and second substances,

the mol ratio of four monomers of the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride is 1: 1.4: 2.2: 1.5;

the mass of the ammonium persulfate is 4.4 percent of the total mass of the monomers, and the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.30;

the mass ratio of the calcium lignosulphonate to the hydrogen peroxide is 8: 1; the total mass of the calcium lignosulfonate and the hydrogen peroxide is 30 percent of the total mass of the monomers.

The acid regulator is sulfuric acid, and the alkali regulator is sodium hydroxide.

The embodiment also provides a preparation method of the high-efficiency retarding water reducer for the highway concrete, which comprises the following steps:

1) according to the mass ratio of 1: 2.0 weighing lignin transverse calcium and distilled water, adding the lignin transverse calcium and the distilled water into a 250ml three-neck flask, placing the mixture into a magnetic stirring constant-temperature oil bath kettle with a condensation reflux device at a test temperature, stirring and dissolving the mixture, adjusting the pH of the solution to be 4.1 by using an acid regulator, keeping the temperature at 80 ℃ for 0.5h, dropwise adding a hydrogen peroxide solution, and reacting the solution at 78 ℃ for 3h to obtain an oxidation modified lignin transverse calcium solution;

2) adding a certain mass of isobutenol polyoxyethylene ether and distilled water into a 250ml three-neck flask, placing the three-neck flask in a constant-temperature oil bath kettle with magnetic stirring at a test temperature, stirring and dissolving, slowly dropwise adding a small monomer solution prepared from maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride and distilled water, a certain mass of oxidation modified wood calcium abscisic acid aqueous solution, an initiator solution prepared from ammonium persulfate and distilled water, and a reducing agent solution prepared from ascorbic acid and distilled water at the same time, and dropwise adding the initiator solution and the reducing agent solution at the same time for 2 hours; after the dropwise addition, preserving the heat for 0.5h at 40 ℃; and after the reaction is finished, cooling the temperature to room temperature, and adjusting the pH to 7.1 by using an alkali regulator to obtain the high-efficiency retarding water reducer product.

Example 4

The high-efficiency slow-setting water reducer for the highway concrete comprises the following components: the water-soluble polymer comprises (1) isobutylene alcohol polyoxyethylene ether, maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride, ammonium persulfate, ascorbic acid, calcium lignosulfonate, hydrogen peroxide, an acid regulator, an alkali regulator and distilled water; wherein the content of the first and second substances,

the mol ratio of four monomers of the isobutenol polyoxyethylene ether, the maleic anhydride, the alpha-methacrylic acid and the allyl trimethyl ammonium chloride is 1: 1.3: 2.2: 1.5;

the mass of the ammonium persulfate is 3.8 percent of the total mass of the monomers, and the molar ratio of the ammonium persulfate to the ascorbic acid is 1: 1.27;

the mass ratio of the calcium lignosulphonate to the hydrogen peroxide is 9: 1; the total mass of the calcium lignosulfonate and the hydrogen peroxide is 20 percent of the total mass of the monomers.

The acid regulator is sulfuric acid, and the alkali regulator is sodium hydroxide.

The embodiment also provides a preparation method of the high-efficiency retarding water reducer for the highway concrete, which comprises the following steps:

1) according to the mass ratio of 1: 1.6 weighing transverse calcium lignin and distilled water, adding the transverse calcium lignin and the distilled water into a 250ml three-neck flask, placing the mixture into a magnetic stirring constant-temperature oil bath kettle with a condensation reflux device at a test temperature, stirring and dissolving the mixture, adjusting the pH of the solution to 3.8 by using an acid regulator, keeping the temperature of 80 ℃ for 0.4h, dropwise adding a hydrogen peroxide solution, and reacting the solution at 77 ℃ for 3.5h to obtain an oxidized modified transverse calcium lignin solution;

2) adding a certain mass of isobutylene polyoxyethylene ether and distilled water into a 250ml three-neck flask, placing the three-neck flask into a constant-temperature oil bath kettle with magnetic stirring at a test temperature, stirring and dissolving, slowly dropwise adding a small monomer solution prepared from maleic anhydride, alpha-methacrylic acid, allyl trimethyl ammonium chloride and distilled water, a certain mass of oxidation modified wood calcium abscisic acid aqueous solution, an initiator solution prepared from ammonium persulfate and distilled water, and a reducing agent solution prepared from ascorbic acid and distilled water at the same time, and dropwise adding the initiator solution and the reducing agent solution at the same time for 1.2 h; after the dropwise addition, preserving the heat for 0.8h at 32 ℃; and after the reaction is finished, cooling the temperature to room temperature, and adjusting the pH to 7.2 by using an alkali regulator to obtain the high-efficiency retarding water reducer product.

Example 5

The effect test of the high-efficiency retarding water reducer for the highway concrete comprises the following steps:

concrete test raw materials comprise the following specific materials:

cement: red lion brand p.o 42.5R cement;

fine aggregate: river sand, medium sand, fineness modulus of 2.6 and mud content of 5 percent; the mud content is 0 percent after multiple times of water washing;

coarse aggregate: the small stones are continuous graded broken stones with nominal grain size of 5-10mm, and are cleaned and dried in the sun, and the large stones are continuous graded broken stones with nominal grain size of 10-20mm, and are cleaned and dried in the sun;

water reducing agent: the control group adopts a conventional polycarboxylic acid water reducing agent, and the test group adopts the high-efficiency retarding water reducing agent obtained in the examples 1-3.

The first set of tests:

the test is provided with a control group and a test group, wherein the control group adopts concrete added with a polycarboxylic acid high-efficiency water reducing agent in the prior art, and the mixing ratio (mass ratio) of the highway concrete is cement: fly ash: fine aggregate with a mud content of 0%: coarse aggregate: water: water reducing agent 360: 740: 300: 1020: 150: 12.

in the test group 1, the setting time of the fresh concrete can reach more than 36h, the slump loss is 6.8h, the slump loss is 5% in 1h and 9% in 3 h;

in the test group 2, the setting time of the fresh concrete can reach more than 36h, the slump loss is 6% in 1h and 10% in 3h, and the slump loss is 6.1 h;

test group 3, the setting time of the fresh concrete can reach more than 36h, the slump loss is 6.2h, the slump loss is 5% in 1h, and the slump loss is 10% in 3 h;

in the control group 1, the setting time of the fresh concrete is 17h, the slump loss is 2-3h, the slump loss is 20% in 1h and 33% in 3 h.

The second set of tests:

the test is provided with a control group and a test group, wherein the control group adopts concrete added with a polycarboxylic acid high-efficiency water reducing agent in the prior art, and the mixing ratio (mass ratio) of the highway concrete is cement: fly ash: fine aggregate with a mud content of 5%: coarse aggregate: water: water reducing agent 360: 740: 300: 1020: 150: 12.

test group 4, the setting time of the fresh concrete can reach more than 36h, the slump loss is 5.8h, the slump loss is 6% in 3h and 10% in 6 h;

test group 5, the setting time of the fresh concrete can reach more than 36h, the slump loss is 5.6h, the slump loss is 7% in 3h, and the slump loss is 12% in 6 h;

test group 6, the setting time of the fresh concrete can reach more than 36h, the slump loss is 5.7h, the slump loss is 6% in 3h, and the slump loss is 11% in 6 h;

in the control group 2, the setting time of the fresh concrete is 15h, the slump loss is 23% after 2-3h and 35% after 10h, and the slump loss is 23% after 6 h.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.