阅读说明：本技术 一种钢渣基胶凝材料专用功能调节剂及其制备方法 (Special function regulator for steel slag-based cementing material and preparation method thereof ) 是由 郭文倩 岳光亮 唐樱燕 谢瑞兴 程伟 彭立刚 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种钢渣基胶凝材料专用功能调节剂及其制备方法,本申请以甲基烯丙醇聚氧乙烯醚、氧化剂、不饱和酸、还原剂、链转移剂为原料制备母液,母液中添加羟丙基甲基纤维素、烷基苯磺酸钠、葡萄糖酸钠后制备调节剂,解决钢渣膨胀带来的混凝土开裂问题,同时与解决钢渣密度大造成混凝土泵送难问题。(The invention discloses a special function regulator for a steel slag-based cementing material and a preparation method thereof.)

1. A preparation method of a special function regulator for a steel slag-based cementing material is characterized by comprising the following steps:

1) adding methallyl alcohol polyoxyethylene ether and an oxidant into a reaction kettle, and stirring and mixing to obtain a mixed solution C;

2) dropwise adding an unsaturated monomer A solution and an unsaturated monomer B solution into the mixed solution C obtained in the step 1), controlling the chemical temperature rise to 43-47 ℃, and keeping the temperature for 1-1.2h to obtain a regulator mother solution; the solution A is a mixed solution of acrylic acid and hydroxyethyl acrylate, and the solution B is a mixed solution of sodium sulfite and a chain transfer agent;

3) compounding the regulator mother liquor obtained in the step 2) with hydroxypropyl methyl cellulose, an air entraining agent and a retarder according to a proportion, and then adding a certain amount of water for dilution to obtain a finished product of the special function regulator.

2. The preparation method according to claim 1, wherein the oxidant in step 1) is ammonium persulfate and hydrogen peroxide which are mixed according to a mass ratio of 1: 1.

3. The method according to claim 1, wherein the final mass ratio of each component in the regulator mother liquor in step 2) is: methallyl alcohol polyoxyethylene ether: oxidizing agent: unsaturated acid: reducing agent: chain transfer agent 300: 2: 40: 1: 1.2.

4. the method according to claim 1, wherein the mass ratio of acrylic acid to hydroxyethyl acrylate in the solution a in step 2) is 1: 2; and the mass ratio of the sodium sulfite to the chain transfer agent in the solution B is 1: 3.

5. The preparation method according to claim 1, wherein the chain transfer agent in step 2) is sodium hypophosphite and sodium methallyl sulfonate in a mass ratio of 1:1, and mixing.

6. The preparation method of claim 1, wherein the mass ratio of the mother solution of the regulator, the hydroxypropyl methylcellulose, the air entraining agent and the retarder in the finished product of the special function regulator in the step 3) is 200: 1: 1: 20, the addition amount of the water is 2.5 times of the mass of the mother liquor of the regulator.

7. The preparation method according to claim 1, wherein the air-entraining agent in step 3) is sodium alkyl benzene sulfonate and the retarder is sodium gluconate.

8. The special functional modifier for steel slag-based cementitious materials prepared according to the method of any one of claims 1 to 7.

9. The application of the special function regulator for the steel slag-based cementing material in the steel slag-based gel material as claimed in claim 8, characterized in that the addition amount of the function regulator is 0.1-0.2 percent of the mass of the gel material.

Technical Field

The invention relates to a special function regulator for a steel slag-based cementing material and a preparation method thereof, belonging to the field of building materials.

Background

The comprehensive utilization of the steel slag can not only eliminate the environmental pollution, but also change waste into valuable and create huge economic benefits, and has very important significance to the nation and the society. The steel slag contains a large amount of Fe and Ca, is a useful element such as Mn and the like which is an effective way for sustainable development, can be used as a flux for sintering, ironmaking, steelmaking and other processes, and the prior secondary utilization of the steel slag is generally applied to the remelting and reutilization of the steel slag after dephosphorization. In the field of building materials, the steel slag is limited by a large amount of free calcium oxide and free magnesium oxide, most of the steel slag can only be used as road engineering application or directly stockpiled and buried, and the added value is low; the steel slag is used as a raw material of a cementing material with high added value, such as cement, a composite admixture and the like, and is less in application, the addition amount of the steel slag in the cementing material is about 5%, and the large-scale application of the steel slag is restricted.

In the application of the existing steel slag as a cementing material, the steel slag is less in consumption, and the application of solid waste materials cannot be fundamentally solved; the mixing amount of the steel slag in the cementing material is directly increased, the steel slag-based cementing material can generate an expansion cracking phenomenon in concrete application, concrete slurry can sink after the use amount of the steel slag is increased, the slurry is separated from aggregate, and the pumping of the concrete is influenced.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides a special function regulator for a steel slag-based cementing material and a preparation method thereof.

A preparation method of a special function regulator for a steel slag-based cementing material comprises the following steps:

1) adding methallyl alcohol polyoxyethylene ether and an oxidant into a reaction kettle, and stirring and mixing to obtain a mixed solution C;

2) dropwise adding an unsaturated monomer A solution and an unsaturated monomer B solution into the mixed solution C obtained in the step 1), controlling the chemical temperature rise to 43-47 ℃, and keeping the temperature for 1-1.2h to obtain a regulator mother solution; the solution A is a mixed solution of acrylic acid and hydroxyethyl acrylate, and the solution B is a mixed solution of sodium sulfite and a chain transfer agent;

3) compounding the regulator mother liquor obtained in the step 2) with hydroxypropyl methyl cellulose, an air entraining agent and a retarder according to a proportion, and then adding a certain amount of water for dilution to obtain a finished product of the special function regulator.

Further, the oxidant in the step 1) is ammonium persulfate and hydrogen peroxide which are mixed according to the mass ratio of 1: 1.

Further, the final mass ratio of each component in the regulator mother liquor in the step 2) is as follows: methallyl alcohol polyoxyethylene ether: oxidizing agent: unsaturated acid: reducing agent: chain transfer agent 300: 2: 40: 1: 1.2.

further, the mass ratio of the acrylic acid to the hydroxyethyl acrylate in the solution A in the step 2) is 1: 2; and the mass ratio of the sodium sulfite to the chain transfer agent in the solution B is 1: 3.

Further, the chain transfer agent in the step 2) is sodium hypophosphite and sodium methallyl sulfonate according to a mass ratio of 1:1, and mixing.

Further, the mass ratio of the mother solution of the regulator, the hydroxypropyl methylcellulose, the air entraining agent and the retarder in the finished product of the special function regulator in the step 3) is 200: 1: 1: 20, the addition amount of the water is 2.5 times of the mass of the mother liquor of the regulator.

Further, the air entraining agent in the step 3) is sodium alkyl benzene sulfonate, and the retarder is sodium gluconate.

The application also protects the special function regulator for the steel slag-based cementing material prepared by the method.

The special function regulator for the steel slag-based gelling material is applied to the steel slag-based gelling material, and the addition amount of the function regulator is 0.1-0.2% of the mass of the gelling material.

Has the advantages that:

1. the functional modifier of the present application produces Ca (OH) with free oxides in the slag-based cementitious material₂And Mg (OH)₂The reaction eliminates unstable factors in the steel slag-based cementing material, solves the problem of concrete cracking caused by steel slag expansion, simultaneously solves the problem of difficult concrete pumping caused by high steel slag density, comprehensively improves the large-scale application of the steel slag in the cementing material, and ensures that the steel slag is applied to the cementing materialThe dosage in the material can reach 40 percent.

2. Phosphate groups and sulfonic groups in the functional regulator promote the hydration of C3A, and in addition, tiny cracks in concrete are filled, so that the early shrinkage of the concrete is accelerated; carboxyl and ester groups carried in acrylic acid and hydroxyethyl ester monomers adsorb the surfaces of C3S particles of the steel slag-based cementing material, so that hydration is promoted, concrete shrinkage is promoted, and cracking is inhibited; the active functional group sulfonic group has stronger permeability, can react with hydration products of the gelled material to generate needle crystals, fills capillary channels and micro cracks, and improves the crack resistance of concrete; the problem of expansibility of the steel slag-based cementing material in concrete is comprehensively solved.

3. The functional regulator can solve the problem of pumpability of the steel slag-based cementing material in concrete application. Hydroxypropyl methyl cellulose and air entraining agent are adsorbed on the surfaces of aggregate and slurry, so that the concrete is ensured to have stable homogeneity, and the pumping problem of the concrete prepared from the steel slag-based cementing material is solved.

Detailed Description

In order to make the technical solutions in the present application better understood, the present invention is further described below with reference to examples, which are only a part of examples of the present application, but not all examples, and the present invention is not limited by the following examples.

Example 1

A preparation method of a special function regulator for a steel slag-based cementing material comprises the following steps:

1) adding methallyl alcohol polyoxyethylene ether and an oxidant into a reaction kettle, stirring and mixing to obtain a mixed solution C, wherein the oxidant is ammonium persulfate and hydrogen peroxide which are mixed according to the mass ratio of 1: 1.

2) Dropwise adding an unsaturated monomer A solution and an unsaturated monomer B solution into the mixed solution C obtained in the step 1), controlling the chemical temperature rise to 43-47 ℃, and keeping the temperature for 1h to obtain a regulator mother solution; the solution A is prepared by mixing acrylic acid and hydroxyethyl acrylate according to the mass ratio of 1:2, the solution B is prepared by mixing sodium sulfite and a chain transfer agent according to the mass ratio of 1:3, and the chain transfer agent is prepared by mixing sodium hypophosphite and sodium methallyl sulfonate according to the mass ratio of 1:1, and the mass ratio of each component in the regulator mother liquor is as follows: methallyl alcohol polyoxyethylene ether: oxidizing agent: unsaturated acid: reducing agent: chain transfer agent 300: 2: 40: 1: 1.2.

3) compounding the regulator mother liquor obtained in the step 2) with hydroxypropyl methyl cellulose, an air entraining agent (sodium alkyl benzene sulfonate) and a retarder (sodium gluconate) according to a certain proportion, and adding a certain amount of water for dilution to obtain a special functional regulator finished product, wherein the mass ratio of the regulator mother liquor to the hydroxypropyl methyl cellulose to the air entraining agent to the retarder is 200: 1: 1: 20, the addition amount of water is 2.5 times of the mass of the mother liquor of the regulator.

Example 2 Effect of the amount of Steel dross added to the gel Material on the gel Material

In the selected steel slag-based cementing material, the proportion of the cementing material is as shown in the following table 2, and the specific surface area of the cementing material is 450m²Kg, and the mixing amount of the functional regulator is 0.15 percent of the mass of the cementing material.

TABLE 1 gel materials proportioning Table

Proportioning	Steel slag/%)	Slag/%)	Clinker/%)	Gypsum/%)
					(a)	20	60	10	10
(b)	30	50	10	10
					(c)	40	40	10	10
(d)	50	30	10	10

The concrete test formulation according to C30 is shown in table 3:

TABLE 1 gel Material testing

From the above data, it can be seen that the maximum amount of steel slag in the cementitious material is 40%, and the expansion value and the autoclave expansion rate are increased obviously and the strength is reduced obviously after the maximum amount is higher than 40%.

Example 3

In the selected steel slag-based cementing material, the proportion of steel slag is 40 percent, the dosage of clinker is 10 percent, the dosage of gypsum is 10 percent, and the specific surface area is 450m²Per kg, taking three 400kg portions of the above gel material, setting the gel material as a blank sample, a reference sample and a comparison sample, wherein the blank sample does not contain a regulator, and the reference sampleThe medium regulator (commercially available, the mixing amount is 0.15% of the mass of the cementing material, the specific components are epoxy resin and aliphatic water reducing agent), and the control sample contains the functional regulator, and the mixing amount is 0.15% of the mass of the cementing material.

TABLE 3C 30 comparison of concrete effects

Remarking: (1) the expansion value is less than or equal to 5.0mm, the pressure steaming expansion rate is less than or equal to 0.5 percent;

as shown in Table 3, the standard sample added with the commercial regulator has the expansion value meeting the requirement, but the autoclaving expansion rate does not meet the requirement, and the application of the steel slag-based cementing material is not satisfied.