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A composite controllable hydration heat cement-based material and its application

A cement-based material and hydration heat technology, applied in the field of cement control materials, can solve the problems of reducing the maximum rate of cement hydration, unfavorable waste gas and waste treatment, limited hydration control performance, etc., so as to reduce the heat release of cement hydration. Rate peaks, reduced cracking, and the effect of a circular economy and sustainable development

Active Publication Date: 2021-06-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN201410009447 discloses a medium-heat Portland cement hydration process control material. The published results show that the optimal ratio can reduce the peak value of the maximum rate of cement hydration, but its preparation process is also relatively complicated
Patent CN201610614229 is prepared from raw materials such as dicalcium silicate and calcium sulfoaluminate. During the process of calcination to prepare cement clinker, a large amount of sulfide will be produced, which is not conducive to the treatment of waste gas and waste residue, and increases the cost
[0005] To sum up, although the existing researches have certain hydration rate control methods, there are still problems such as unenvironmental protection, cumbersome preparation, and limited hydration control performance.

Method used

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  • A composite controllable hydration heat cement-based material and its application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides the preparation method of the adjustable hydration heat composite cement-based material, including the following steps:

[0029] (1) Add a certain proportion of cross-linking agent and organic acid into water to fully dissolve and mix evenly to obtain a mixed solvent.

[0030] (2) A certain proportion of starch-based polymeric organic matter and Portland cement powder are fully mixed to obtain a mixed powder.

[0031] (3) Mix the above mixed solvent and mixed powder, stir at a high speed for 120s, weigh an appropriate amount of slurry, and conduct a hydration heat test.

[0032] Wherein, in the step (1), the crosslinking agent and the organic acid are respectively kh550 silane coupling agent and citric acid, and the admixture mass is based on the mass percentage of Portland cement, and the content is 0.05%.

[0033] Wherein, in the step (2), the starch-based macromolecular organic matter is dextrin (12300 g / mol), and the added mass is based on ...

Embodiment 2

[0035] This embodiment provides the preparation method of the adjustable hydration heat composite cement-based material, including the following steps:

[0036] (1) Add a certain proportion of cross-linking agent and organic acid into water to fully dissolve and mix evenly to obtain a mixed solvent.

[0037] (2) A certain proportion of starch-based polymeric organic matter and Portland cement powder are fully mixed to obtain a mixed powder.

[0038] (3) Mix the above mixed solvent and mixed powder, stir at a high speed for 120s, weigh an appropriate amount of slurry, and conduct a hydration heat test.

[0039] Wherein, in the step (1), the crosslinking agent and the organic acid are respectively kh550 silane coupling agent and citric acid, and the admixture mass is based on the mass percentage of Portland cement, and the content is 0.1%.

[0040] Wherein, in step (2), the starch-based macromolecular organic matter is dextrin (12300 g / mol), and the added mass is based on the m...

Embodiment 3

[0042] This embodiment provides the preparation method of the adjustable hydration heat composite cement-based material, including the following steps:

[0043] (1) Add a certain proportion of cross-linking agent and organic acid into water to fully dissolve and mix evenly to obtain a mixed solvent.

[0044] (2) fully mixing a certain proportion of starch-based polymeric organic matter and Portland cement powder to obtain a mixed powder;

[0045] (3) Mix the above mixed solvent and mixed powder, stir at a high speed for 120s, weigh an appropriate amount of slurry, and conduct a hydration heat test.

[0046] Wherein, in the step (1), the crosslinking agent and the organic acid are respectively kh550 silane coupling agent and citric acid, and the admixture mass is based on the mass percentage of Portland cement, and the content is 0.1%.

[0047] Wherein, in the step (2), the starch-based macromolecular organic matter is dextrin (12300 g / mol), and the added mass is based on the ma...

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Abstract

The invention discloses a composite adjustable hydration heat cement-based material and its application in reducing the hydration reaction speed of cement. The composite adjustable hydration heat cement-based material includes a crosslinking agent, an organic acid and a starch-based polymer organic matter. The preparation process of the composite cement hydration control material is simple and low in cost, and the cement hydration rate can be adjusted in stages, which is greatly improved compared with the existing technology, and can reduce the peak value of the maximum heat release rate of cement hydration. At the same time, it can also reduce the heat of hydration during the cement hydration process, effectively reduce the cracking of large-volume concrete caused by temperature stress, and improve the durability and safety of large-volume concrete components.

Description

technical field [0001] The invention relates to a composite controllable hydration heat cement-based material and its application, belonging to the technical field of cement control materials. Background technique [0002] Among the cracks in mass concrete structures, the cracks caused by load only account for 20% of the total, while the other 80% of the cracks are caused by concrete deformation. The heat of hydration of the cementitious material is the main cause of the temperature difference between the inside and outside of the concrete. The temperature gradient caused by the temperature leads to a huge stress inside the concrete, which eventually leads to the generation of cracks. The hydration reaction of cement will generate a large amount of heat of hydration. Since the cross-sectional size of the mass concrete structure is large, and the concrete material itself is a poor conductor of heat, the internal temperature field of the structure will not undergo immediate te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B28/04
Inventor 蒋金洋王立国琚思懿王兰心王凤娟张傲宁
Owner SOUTHEAST UNIV
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