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...

Examples

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...

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...

Examples

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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