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Concrete aggregate dispersing agent

A dispersant and concrete technology, applied in the field of concrete adjuvants, can solve the problems of reducing concrete strength and durability, unfavorable concrete transportation, and increasing engineering costs.

Active Publication Date: 2021-07-23
SHANDONG JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In engineering, the loss of concrete slump is too large and too fast. On the one hand, it is not conducive to the transportation of concrete, and on the other hand, it is not conducive to the construction of workers. It is generally solved by increasing the amount of admixture or increasing water consumption. The increase of the dosage increases the cost of the project; the increase of water consumption reduces the strength and durability of concrete

Method used

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  • Concrete aggregate dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A concrete aggregate dispersant is composed of maleic anhydride-pentaerythritol copolymer, sodium polyacrylate microspheres and octylphenol polyoxyethylene ether in a mass ratio of 10:1.2:1.

[0030] Wherein, the preparation method of maleic anhydride-pentaerythritol polymer is as follows:

[0031] Dry maleic anhydride and pentaerythritol in an oven at normal pressure at 40°C, put the dried maleic anhydride and pentaerythritol into the reactor at a mass ratio of 5.6:1, raise the temperature to 180°C, and cool down after 5 hours of reaction Add concentrated sulfuric acid and concentrated phosphoric acid at a mass ratio of 5.6:1 to 50°C to add mixed acid, the amount of mixed acid is 1% of the total mass of maleic anhydride and pentaerythritol after drying, stir at high speed for 30 minutes, adjust the pH of the system to 7 with ammonia water, Return to room temperature.

[0032] The preparation method of sodium polyacrylate microspheres is as follows:

[0033] Add sodiu...

Embodiment 2

[0035] A concrete aggregate dispersant, which is composed of maleic anhydride-pentaerythritol copolymer, sodium polyacrylate microspheres, and octylphenol polyoxyethylene ether in a mass ratio of 10:1:1.

[0036] Wherein, the preparation method of maleic anhydride-pentaerythritol polymer is as follows:

[0037] Dry maleic anhydride and pentaerythritol in an oven at normal pressure at 40°C, put the dried maleic anhydride and pentaerythritol into the reactor at a mass ratio of 3:1, raise the temperature to 200°C, and cool down after 4 hours of reaction Add concentrated sulfuric acid and concentrated phosphoric acid at a mass ratio of 3:1 to 55°C to add mixed acid, the amount of mixed acid is 1% of the total mass of maleic anhydride and pentaerythritol after drying, stir at high speed for 40 minutes and adjust the pH of the system to 7 with ammonia water, Return to room temperature.

[0038] The preparation method of sodium polyacrylate microspheres is as follows:

[0039] Add ...

Embodiment 3

[0041] A concrete aggregate dispersant, which is composed of maleic anhydride-pentaerythritol copolymer, sodium polyacrylate microspheres, and octylphenol polyoxyethylene ether in a mass ratio of 8:1:1.

[0042] Wherein, the preparation method of maleic anhydride-pentaerythritol polymer is as follows:

[0043] Dry maleic anhydride and pentaerythritol in an oven at normal pressure at 40°C, put the dried maleic anhydride and pentaerythritol into the reactor at a mass ratio of 5:1, raise the temperature to 200°C, and cool down after 5 hours of reaction Add concentrated sulfuric acid and concentrated phosphoric acid at a mass ratio of 5:1 to 55°C to add mixed acid, the amount of mixed acid is 1% of the total mass of maleic anhydride and pentaerythritol after drying, stir at high speed for 50 minutes and adjust the pH of the system to 7 with ammonia water, Return to room temperature.

[0044] The preparation method of sodium polyacrylate microspheres is as follows:

[0045]Add so...

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Abstract

The invention relates to the field of concrete auxiliaries, in particular to a concrete aggregate dispersing agent which is composed of a maleic anhydride-pentaerythritol polymer, polyacrylate or polyacrylate microspheres and alkylphenol polyoxyethylene ether. The maleic anhydride-pentaerythritol copolymer, the polyacrylate or the polyacrylate microspheres and the alkylphenol polyoxyethylene ether in the dispersing agent prepared by the invention have high compatibility, after the dispersing agent is added, the mechanical strength and workability of concrete can be effectively improved, and the water consumption of the concrete can be reduced.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a concrete aggregate dispersant. Background technique [0002] Concrete is the main raw material of civil engineering, so its strength is a key hard indicator. Theoretically speaking, the strength of concrete is determined by the composition of its materials (cement, gravel, sand and other auxiliary materials) and the theoretical standard water consumption. As long as the composition and materials of concrete are determined, its strength is determined by the theoretical water consumption. Decided. However, if concrete is produced according to the theoretical water consumption of concrete, concrete has no plasticity, let alone good fluidity and workability. If more water is added to make concrete have good fluidity and workability, then concrete The intensity of will decrease with the increase of water consumption, and its decrease will show a nonlinear relationship with water ...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/40
CPCC04B40/0039C04B2103/408C04B24/32C04B24/283C04B24/2641
Inventor 陈仁山赵连地张则民张伟刘恒满刘春波
Owner SHANDONG JIAOTONG UNIV
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