阅读说明：本技术 一种z形混凝土空心砌块生产用改性铝酸盐水泥缓凝剂的制备方法 (Preparation method of modified aluminate cement retarder for Z-shaped concrete hollow block production ) 是由 王学军 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种Z形混凝土空心砌块生产用改性铝酸盐水泥缓凝剂的制备方法,具体如下：按质量份数计,取改性木棉纤维5-10份、改性椰子纤维5-10份、木质素磺酸钠20-30份、二萘基甲烷二磺酸钠5-8份,减水剂1-6份、不饱和羧基酸1-3份、硼酸2-5份、蛭石5-10份混合后制得。本发明通过在常见的缓凝剂中添加改性木棉纤维和改性椰子纤维,在不影响缓凝剂效果的前提下,大大降低了缓凝剂的生产成本,使水泥的生产运输成本大大降低,有效延长水泥的水化硬化时间,使新拌混凝土能在较长时间内保持塑性,从而调节新拌混凝土的凝结时间。(The invention discloses a preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks, which comprises the following steps: according to the mass portion, 5-10 portions of modified kapok fiber, 5-10 portions of modified coconut fiber, 20-30 portions of sodium lignosulfonate, 5-8 portions of dinaphthyl methane disulfonate, 1-6 portions of water reducing agent, 1-3 portions of unsaturated carboxylic acid, 2-5 portions of boric acid and 5-10 portions of vermiculite are mixed to prepare the modified kapok fiber. According to the invention, the modified kapok fiber and the modified coconut fiber are added into the common retarder, so that the production cost of the retarder is greatly reduced on the premise of not influencing the effect of the retarder, the production and transportation cost of cement is greatly reduced, the hydration and hardening time of the cement is effectively prolonged, the fresh concrete can keep plasticity for a long time, and the setting time of the fresh concrete is adjusted.)

1. A preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks is characterized by comprising the following steps:

according to the mass portion, 5-10 portions of modified kapok fiber, 5-10 portions of modified coconut fiber, 20-30 portions of sodium lignosulfonate, 5-8 portions of dinaphthyl methane disulfonate, 1-6 portions of water reducing agent, 1-3 portions of unsaturated carboxylic acid, 2-5 portions of boric acid and 5-10 portions of vermiculite are mixed to prepare the modified kapok fiber.

2. The preparation method of the modified aluminate cement retarder for producing the Z-shaped concrete hollow block according to claim 1, is characterized in that: the modified kapok fiber is prepared by mixing 8 parts of modified kapok fiber, 8 parts of modified coconut fiber, 25 parts of sodium lignosulfonate, 6 parts of dinaphthyl methane disulfonate, 3 parts of water reducing agent, 2 parts of unsaturated carboxylic acid, 3 parts of boric acid and 8 parts of vermiculite in parts by weight.

3. The preparation method of the modified aluminate cement retarder for producing the Z-shaped concrete hollow block according to claim 1 or 2, which is characterized in that: the water reducing agent is a sulfamate high-efficiency water reducing agent.

4. The preparation method of the modified aluminate cement retarder for producing the Z-shaped concrete hollow block according to claim 1 or 2, wherein the preparation method of the modified kapok fiber specifically comprises the following steps:

(1) drying the natural kapok fiber until the water content is 4-6%, then placing the natural kapok fiber in a temperature changing box for temperature changing treatment, firstly treating the natural kapok fiber at low temperature of 60-70 ℃ for 30-40min, then treating the natural kapok fiber at high temperature of 120-125 ℃ for 3-8min, and repeatedly treating the natural kapok fiber at high temperature and low temperature for 5-10 times to obtain the temperature changing kapok fiber;

(2) and (3) oxidizing the temperature-variable ceiba fiber in a vacuum tank, vacuumizing, and introducing ozone at 40-50 ℃ for 30-40min to obtain the modified ceiba fiber.

5. The preparation method of the modified aluminate cement retarder for producing the Z-shaped concrete hollow block according to claim 4, is characterized in that: the concentration of the ozone is 0.2-0.4 ppm.

6. The preparation method of the modified aluminate cement retarder for the production of the Z-shaped concrete hollow block according to claim 1 or 2, wherein the preparation method of the modified coconut fiber specifically comprises the following steps:

1) crushing coconut shells into 100 meshes, and dispersing the crushed coconut shells into an organic solvent to prepare a suspension with the mass fraction of 5-8%;

2) adding anion powder into the suspension, wherein the addition amount of the anion powder is 2-5% of the mass of the coconut shell, heating to 50-60 ℃, stirring for 50-60min at the rotation speed of 1200-1500r/min, then adding a coupling agent accounting for 1% of the mass of the coconut shell, and continuously stirring for 5-8min to obtain a mixed solution;

3) adding silicate accounting for 2% of the mixed solution by mass, and then grinding and mixing;

4) and (5) distilling under reduced pressure to recover the organic solvent, and naturally cooling to room temperature to obtain the organic solvent.

7. The preparation method of the modified aluminate cement retarder for producing the Z-shaped concrete hollow block according to claim 6, is characterized in that: the particle size of the anion powder is 0.01mm-0.02 mm.

8. The preparation method of the modified aluminate cement retarder for producing the Z-shaped concrete hollow block according to claim 6, is characterized in that: the coupling agent is a monoalkoxy pyrophosphate coupling agent.

Technical Field

The invention relates to the technical field of concrete production, in particular to a preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks.

Background

The concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening. Concrete is mainly divided into two stages and states: plastic state before setting and hardening, namely fresh concrete or concrete mixture; hardened, i.e. hardened concrete or concrete. The concrete strength grade is divided into cubic compression strength standard values, and the common Chinese concrete strength grade is divided into 14 grades.

The retarder is added into commercial concrete for prolonging the hydration hardening time of cement, so that the fresh concrete can keep plasticity for a long time, thereby adjusting the setting time of the fresh concrete.

In the prior art, the production cost of the concrete retarder is high, and the development of enterprises is not facilitated.

Disclosure of Invention

In order to solve the problems in the background technology, the invention provides a preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks.

A preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks comprises the following steps:

according to the mass portion, 5-10 portions of modified kapok fiber, 5-10 portions of modified coconut fiber, 20-30 portions of sodium lignosulfonate, 5-8 portions of dinaphthyl methane disulfonate, 1-6 portions of water reducing agent, 1-3 portions of unsaturated carboxylic acid, 2-5 portions of boric acid and 5-10 portions of vermiculite are mixed to prepare the modified kapok fiber.

Further, the water reducing agent is a sulfamate high-efficiency water reducing agent.

Further, the preparation method of the modified kapok fiber specifically comprises the following steps:

(1) drying the natural kapok fiber until the water content is 4-6%, then placing the natural kapok fiber in a temperature changing box for temperature changing treatment, firstly treating the natural kapok fiber at low temperature of 60-70 ℃ for 30-40min, then treating the natural kapok fiber at high temperature of 120-125 ℃ for 3-8min, and repeatedly treating the natural kapok fiber at high temperature and low temperature for 5-10 times to obtain the temperature changing kapok fiber;

(2) and (3) oxidizing the temperature-variable ceiba fiber in a vacuum tank, vacuumizing, and introducing ozone at 40-50 ℃ for 30-40min to obtain the modified ceiba fiber.

Further, the concentration of the ozone is 0.2-0.4 ppm.

Further, the preparation method of the modified coconut fiber specifically comprises the following steps:

1) crushing coconut shells into 100 meshes, and dispersing the crushed coconut shells into an organic solvent to prepare a suspension with the mass fraction of 5-8%;

2) adding anion powder into the suspension, wherein the addition amount of the anion powder is 2-5% of the mass of the coconut shell, heating to 50-60 ℃, stirring for 50-60min at the rotation speed of 1200-1500r/min, then adding a coupling agent accounting for 1% of the mass of the coconut shell, and continuously stirring for 5-8min to obtain a mixed solution;

3) adding silicate accounting for 2% of the mixed solution by mass, and then grinding and mixing;

4) and (5) distilling under reduced pressure to recover the organic solvent, and naturally cooling to room temperature to obtain the organic solvent.

Furthermore, the particle size of the negative ion powder is 0.01mm-0.02 mm.

Further, the coupling agent is a monoalkoxy pyrophosphate coupling agent.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the modified kapok fiber and the modified coconut fiber are added into the common retarder, so that the production cost of the retarder is greatly reduced on the premise of not influencing the effect of the retarder, the production and transportation cost of cement is greatly reduced, the hydration and hardening time of the cement is effectively prolonged, the fresh concrete can keep plasticity for a long time, and the setting time of the fresh concrete is adjusted.

Detailed Description

Example 1

A preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks comprises the following steps:

the modified coconut fiber water reducing agent is prepared by mixing 5 parts of modified kapok fiber, 5 parts of modified coconut fiber, 20 parts of sodium lignosulfonate, 5 parts of dinaphthyl methane disulfonate, 1 part of water reducing agent, 1 part of unsaturated carboxylic acid, 2 parts of boric acid and 5 parts of vermiculite in parts by weight.

Further, the water reducing agent is a sulfamate high-efficiency water reducing agent.

Further, the preparation method of the modified kapok fiber specifically comprises the following steps:

(1) drying the natural kapok fiber until the water content is 4-6%, then placing the natural kapok fiber in a temperature changing box for temperature changing treatment, firstly treating the natural kapok fiber at low temperature of 60-70 ℃ for 30-40min, then treating the natural kapok fiber at high temperature of 120-125 ℃ for 3-8min, and repeatedly treating the natural kapok fiber at high temperature and low temperature for 5-10 times to obtain the temperature changing kapok fiber;

(2) and (3) oxidizing the temperature-variable ceiba fiber in a vacuum tank, vacuumizing, and introducing ozone at 40-50 ℃ for 30-40min to obtain the modified ceiba fiber.

Further, the concentration of the ozone is 0.2 ppm.

Further, the preparation method of the modified coconut fiber specifically comprises the following steps:

1) crushing coconut shells into 100 meshes, and dispersing the crushed coconut shells into an organic solvent to prepare a suspension with the mass fraction of 5-8%;

2) adding anion powder into the suspension, wherein the addition amount of the anion powder is 2-5% of the mass of the coconut shell, heating to 50-60 ℃, stirring for 50-60min at the rotation speed of 1200-1500r/min, then adding a coupling agent accounting for 1% of the mass of the coconut shell, and continuously stirring for 5-8min to obtain a mixed solution;

3) adding silicate accounting for 2% of the mixed solution by mass, and then grinding and mixing;

4) and (5) distilling under reduced pressure to recover the organic solvent, and naturally cooling to room temperature to obtain the organic solvent.

Further, the particle size of the negative ion powder is 0.01 mm.

Further, the coupling agent is a monoalkoxy pyrophosphate coupling agent.

Example 2

A preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks comprises the following steps:

the modified coconut fiber water reducing agent is prepared by mixing 10 parts of modified kapok fiber, 10 parts of modified coconut fiber, 30 parts of sodium lignosulfonate, 8 parts of dinaphthyl methane disulfonate, 1 part of water reducing agent, 3 parts of unsaturated carboxylic acid, 5 parts of boric acid and 10 parts of vermiculite in parts by weight.

Further, the water reducing agent is a sulfamate high-efficiency water reducing agent.

Further, the preparation method of the modified kapok fiber specifically comprises the following steps:

(1) drying the natural kapok fiber until the water content is 4-6%, then placing the natural kapok fiber in a temperature changing box for temperature changing treatment, firstly treating the natural kapok fiber at low temperature of 60-70 ℃ for 30-40min, then treating the natural kapok fiber at high temperature of 120-125 ℃ for 3-8min, and repeatedly treating the natural kapok fiber at high temperature and low temperature for 5-10 times to obtain the temperature changing kapok fiber;

(2) and (3) oxidizing the temperature-variable ceiba fiber in a vacuum tank, vacuumizing, and introducing ozone at 40-50 ℃ for 30-40min to obtain the modified ceiba fiber.

Further, the concentration of the ozone is 0.4 ppm.

Further, the preparation method of the modified coconut fiber specifically comprises the following steps:

1) crushing coconut shells into 100 meshes, and dispersing the crushed coconut shells into an organic solvent to prepare a suspension with the mass fraction of 5-8%;

2) adding anion powder into the suspension, wherein the addition amount of the anion powder is 2-5% of the mass of the coconut shell, heating to 50-60 ℃, stirring for 50-60min at the rotation speed of 1200-1500r/min, then adding a coupling agent accounting for 1% of the mass of the coconut shell, and continuously stirring for 5-8min to obtain a mixed solution;

3) adding silicate accounting for 2% of the mixed solution by mass, and then grinding and mixing;

4) and (5) distilling under reduced pressure to recover the organic solvent, and naturally cooling to room temperature to obtain the organic solvent.

Further, the particle size of the negative ion powder is 0.02 mm.

Further, the coupling agent is a monoalkoxy pyrophosphate coupling agent.

Example 3

A preparation method of a modified aluminate cement retarder for producing Z-shaped concrete hollow blocks comprises the following steps:

the modified kapok fiber is prepared by mixing 8 parts of modified kapok fiber, 8 parts of modified coconut fiber, 25 parts of sodium lignosulfonate, 6 parts of dinaphthyl methane disulfonate, 3 parts of water reducing agent, 2 parts of unsaturated carboxylic acid, 3 parts of boric acid and 8 parts of vermiculite in parts by weight.

Further, the water reducing agent is a sulfamate high-efficiency water reducing agent.

Further, the preparation method of the modified kapok fiber specifically comprises the following steps:

(1) drying the natural kapok fiber until the water content is 4-6%, then placing the natural kapok fiber in a temperature changing box for temperature changing treatment, firstly treating the natural kapok fiber at low temperature of 60-70 ℃ for 30-40min, then treating the natural kapok fiber at high temperature of 120-125 ℃ for 3-8min, and repeatedly treating the natural kapok fiber at high temperature and low temperature for 5-10 times to obtain the temperature changing kapok fiber;

(2) and (3) oxidizing the temperature-variable ceiba fiber in a vacuum tank, vacuumizing, and introducing ozone at 40-50 ℃ for 30-40min to obtain the modified ceiba fiber.

Further, the concentration of the ozone is 0.3 ppm.

Further, the preparation method of the modified coconut fiber specifically comprises the following steps:

1) crushing coconut shells into 100 meshes, and dispersing the crushed coconut shells into an organic solvent to prepare a suspension with the mass fraction of 5-8%;

2) adding anion powder into the suspension, wherein the addition amount of the anion powder is 2-5% of the mass of the coconut shell, heating to 50-60 ℃, stirring for 50-60min at the rotation speed of 1200-1500r/min, then adding a coupling agent accounting for 1% of the mass of the coconut shell, and continuously stirring for 5-8min to obtain a mixed solution;

3) adding silicate accounting for 2% of the mixed solution by mass, and then grinding and mixing;

4) and (5) distilling under reduced pressure to recover the organic solvent, and naturally cooling to room temperature to obtain the organic solvent.

Further, the particle size of the negative ion powder is 0.015 mm.

Further, the coupling agent is a monoalkoxy pyrophosphate coupling agent.

Comparative example 1

In comparison with example 1, the present comparative example directly uses unmodified kapok fiber as the raw material without modifying kapok fiber, except that the other steps are the same.

Comparative example 2

This comparative example compares with example 2 without modification of the coconut fibers, but directly with unmodified coconut fibers as the starting material, except that the process steps are otherwise the same.

Comparative example 3

Compared with the example 3, the temperature-variable kapok fiber is directly used as the raw material without the operation of the step (2) in the comparative example, except that the steps of the method are the same.

Control group

A commercially available aluminate cement retarder is adopted.

The 7 kinds of aluminate cement retarders are respectively used as concrete admixtures to be added into concrete mixtures, the number of test pieces required by the preparation and the setting test of concrete test pieces is performed according to 6.4 of GB8076-2008, and the setting time difference measurement is performed according to 6.5.5 of GB8076-2008, as shown in Table 1:

TABLE 1

	Initial setting time (min)	Final setting time (min)	Difference of coagulation time (min)
				Example 1	125	176	51
Example 2	122	172	50
				Example 3	131	178	47
Comparative example 1	98	121	33
				Comparative example 2	93	117	24
Comparative example 3	102	135	33
				Control group	72	86	14

As can be seen from Table 1, the initial setting time and the final setting time of the concrete using the aluminate cement retarder of the embodiment as the concrete admixture are longer than those of the aluminate cement retarders of the comparative examples and the comparative examples, so that the preparation method of the modified aluminate cement retarder for producing the Z-shaped concrete hollow block can improve the setting time difference of the concrete, keep the plasticity of fresh concrete in a longer time and adjust the setting time of the fresh concrete.

The above description is only for the preferred embodiment of the present invention, but the present invention is not limited to the scope of the implementation, and all the equivalent embodiments changed or modified according to the concept of the present invention should be within the scope of the protection of the present invention without departing from the spirit covered by the description and the embodiments.