Low-temperature preparation method of anti-cracking agent of concrete

An anti-cracking agent and concrete technology, applied in the field of materials, can solve the problems of high energy consumption and complex process, and achieve the effects of low energy consumption, low calcination temperature and lower initial cost

Active Publication Date: 2018-11-20
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a low-temperature preparation method of concrete anti-cracking agent, to overcome the above-mentioned deficiencies of complex process and high energy consumption in the prior art, and to realize the effective treatment of waste slag

Method used

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  • Low-temperature preparation method of anti-cracking agent of concrete

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Effect test

preparation example Construction

[0025] A kind of low-temperature preparation method of concrete anti-cracking agent of the present invention, comprises the steps:

[0026] (1) Put the raw materials into a planetary ball mill, mix and grind them; wherein, the raw materials include aluminum-calcium raw materials, aluminum raw materials, calcium raw materials, and industrial gypsum; the mass ratio of raw materials is: aluminum-calcium raw materials: aluminum raw materials : Calcium raw materials: industrial gypsum = 15.73-29.05: 33.82-48.5: 27.62-40.13: 10.08-18.62; aluminum-calcium raw materials are high alumina cement, CaO-Al 2 o 3 One or more of base refining slag or waste refractory materials; aluminum raw material is bauxite; calcareous raw material is limestone; industrial gypsum is industrial waste gypsum such as desulfurized gypsum;

[0027] (2) Press the raw materials mixed in step (1) into a cake under a pressure of 2-6 MPa, place it in a high-temperature electric furnace and heat it up to 700°C-1200...

Embodiment 1

[0034] The ratio of raw materials is as shown in Table 2:

[0035] Table 2 Embodiment 1 raw material proportioning

[0036]

[0037] Specific steps are as follows:

[0038] 1) Mixing: Weigh the raw materials according to the ratio in Table 2, place them in a planetary mill, grind for 120min, and press them into cakes under a pressure of 2MPa;

[0039] 2) Calcination: put it in a high-temperature electric furnace and raise the temperature to 700°C, keep it warm for 3 hours, and then cool it rapidly;

[0040] 3) Sieving: Grind until the particles can all pass through a square hole sieve with a pore size of 80 μm, and carry out XRD test and SEM analysis, such as figure 1 and figure 2 (CA, CA 2 , high alumina cement is mesophase).

Embodiment 2

[0042] Specific steps are as follows:

[0043] 1) Mixing: Weigh the raw materials according to the ratio in Table 2, place them in a planetary mill, grind for 120min, and press them into cakes under a pressure of 2MPa;

[0044] 2) Calcination: put it in a high-temperature electric furnace and raise the temperature to 700°C, keep it warm for 3 hours, and then cool it rapidly;

[0045] 3) Sieve: Grind until the particles can all pass through a square hole sieve with an aperture of 80 μm and a specific surface area of ​​350 m 2 / Kg, obtain anti-cracking agent;

[0046] 4) Strength test: the anti-cracking agent obtained in the step 3) of adding 5% of the cement mass into ordinary Portland cement, respectively carried out 3d, 28d bending resistance, compressive strength performance test and crack resistance performance test, as shown in Table 3 shown.

[0047] Table 3 Example 2 strength performance and crack resistance test

[0048]

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Abstract

The invention discloses a low-temperature preparation method of an anti-cracking agent of concrete. The low-temperature preparation method comprises the following steps: (1) putting raw materials intoa planetary ball grinder for uniform mixing and grinding, wherein the raw materials comprise an aluminum calcium raw material, an aluminum raw material, a calcium raw material and industrial gypsum;(2) pressing the raw materials mixed in the step (1) into a cake, putting the cake into a high-temperature electric furnace, calcining cake at the temperature of 700 to 1,200 DEG C, and taking out andquenching the cake; (3) grinding a product obtained in the step (2) to obtain the sulfoaluminate anti-cracking agent. According to the low-temperature preparation method disclosed by the invention, common wastes containing an intermediate phase CA (mono calcium aluminate), CA2 (calcium dialuminate) and other aluminates are used as the raw materials, and the raw materials are not required to be modified or subjected to other treatment processes, so that the treatment cost is reduced, and the utilization rate of the raw materials is increased. The early cost is greatly reduced, and the environmental problems caused by industrial waste slag are solved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a concrete anti-cracking agent by using an intermediate product at low temperature. Background technique [0002] Admixtures are considered as the fifth component of concrete. Adding admixtures to concrete can improve its application performance, strength performance and durability. There are many kinds of concrete admixtures, and the normal mixing amount is 1%-10%, which can greatly affect the performance of concrete. Therefore, its variety selection, application technology, and quality control are more important than other concrete components. Concrete anti-cracking agent has the functions of compensating concrete drying shrinkage and compacting concrete, and improving concrete impermeability. It is mainly used in two aspects of waterproof and crack resistance in civil engineering. Now it is used in the preparation of high-grade waterproof ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B28/04
CPCC04B28/04C04B40/0046C04B2201/50C04B7/32C04B22/10C04B22/06C04B22/145C04B22/0006
Inventor 郭伟王枭陈佳彬周顺何梓清
Owner YANCHENG INST OF TECH
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