Composite and adjustable hydration heat cement-based material and application thereof

Abstract

The invention discloses a composite and adjustable hydration heat cement-based material and application of the material in reducing the speed of a cement hydration reaction. The composite and adjustable hydration heat cement-based material comprises a cross-linking agent, organic acid and organic starch-base macromolecule matter. The composite and adjustable hydration heat cement-based material issimple in preparation technology, low in cost and capable of adjusting the cement hydration rate by stages, and compared with the prior art, great improvement is achieved, and the maximum peak valueof the heat release rate of cement hydration can be reduced. The amount of released heat in the cement hydration process can be further reduced, the phenomenon that cracking of mass concrete is causedby temperature stress is effectively reduced, and the durability and safety of a mass concrete member are improved.

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...

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.

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