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A composite modified hydration heat control material and its preparation method and application

A composite modification and heat of hydration technology, applied in the field of concrete admixtures, can solve the problems of not meeting the requirements of mass concrete, prolonging the setting time of concrete, reducing the strength of concrete, etc., and achieving high acid and alkali resistance and shear resistance. , The effect of improving freeze-thaw resistance and reducing surface tension

Active Publication Date: 2017-01-04
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EP1233008A1 discloses a cement admixture and cement composition. In this method, dextrin is added to suppress the heat of hydration, but the unmodified dextrin can only reduce the adiabatic temperature by 5°C, which cannot meet the requirements of mass concrete.
JP3729340B2 discloses a composite material composed of slag and dextrin. Although unmodified dextrin can reduce the central temperature of concrete, the strength of concrete also decreases, which brings certain negative effects
CN102101759B discloses a concrete composite admixture and its preparation method and application. The results show that it has certain significance for concrete temperature control and anti-cracking, but the sodium gluconate used in it will be adsorbed on the surface of cement concrete to disperse each other, thereby prolonging the The setting time of concrete is not conducive to actual construction, and the patent does not disclose its preparation method

Method used

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  • A composite modified hydration heat control material and its preparation method and application
  • A composite modified hydration heat control material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The preparation of the hydration heat regulating material includes the following steps: adding 100g of wheat starch into water to prepare a starch solution with a concentration of 30wt%, heating to 40°C and then adding 25g of hydrochloric acid and 1g of N,N'-methylenebisacrylamide React for 5 hours, adjust and maintain the pH value to 8 with sodium hydroxide, add 10 g of alkenyl succinic anhydride to react for 12 hours, adjust the pH value to 5 with hydrochloric acid, wash and concentrate, dry in an oven at 60 ° C for 20 hours, and sieve to obtain 80~ 100-mesh solid granular hydration heat control material product.

Embodiment 2

[0026] The preparation of the hydration heat regulating material comprises the following steps: adding 100g of cornstarch into water to prepare a starch solution with a concentration of 60wt%, heating the temperature to 60°C, and then adding 5g of hydrochloric acid and 3g of 1,6-hexanediol diacrylate to react 10h, adjust and maintain the pH value to 10 with sodium hydroxide, add 30g of alkenyl succinic anhydride to react for 5h, adjust the pH value to 5 with hydrochloric acid, wash and concentrate, dry in an oven at 60°C for 20h, and sieve to obtain 80-100 The object is a solid granular hydration heat regulating material product.

Embodiment 3

[0028] The preparation of the hydration heat regulating material comprises the following steps: adding 100g of potato starch into water to prepare a starch solution with a concentration of 50wt%, adding 10g of nitric acid and 3g of polyethylene glycol diacrylate (molecular weight 200 Polyethylene glycol diacrylate of -300 can realize the present invention) reaction 15h, adjust and maintain pH value to 10 with sodium hydroxide, add 20g alkenyl succinic anhydride reaction 10h, adjust pH value to 6 after washing with hydrochloric acid and Concentrate, dry in an oven at 60°C for 20 hours, and sieve to obtain a solid granular hydration heat regulating material product of 80 to 100 mesh.

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Abstract

The invention relates to a composite modified hydration heat regulation material. Starch is firstly reacted with an acid catalyst and a crosslinking agent, and then a product is reacted with alkenyl succinic anhydride to obtain the composite modified hydration heat regulation material, wherein the amount of the acid catalyst is 5 to 25 % of the mass of the starch, the amount of the crosslinking agent is 1 to 5% of the mass of the starch, and the amount of the alkenyl succinic anhydride is 10 to 30% of the mass of the starch. The invention also provides a preparation method and application of the hydration heat regulation material. The regulation material is prepared by a starch crosslinking reaction, and has a spatial network structure, and high resistance to acid and alkali and high shear resistance, the peak value of the hydration heat release rate can be effectively reduced, and the compressive strength of concrete is improved; meanwhile, by introducing a polar acetyl functional group, the polarity characteristic of the hydration heat regulation material is improved, the number of intermolecular hydrogen bonds is reduced, and the freeze-thaw property of the material is improved; and the modified hydration heat regulation material has the advantages of reducing the surface tension of a cement pore solution, generating independent closed bubbles, also playing an air entraining role of a three-dimensional network structure, improving the freeze-thaw property of concrete, and being favorable for the practical application of the hydration heat regulation material.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a composite modified hydration heat regulating material and its preparation method and application. Background technique [0002] Due to the heat released by the hydration of the cement in the mass concrete, it is too late to dissipate inside the concrete, which increases the internal temperature of the concrete, which can even reach 70°C in summer. The huge temperature difference between inside and outside will generate great temperature stress, which will eventually lead to cracks in concrete and cause serious consequences. Therefore, it is necessary to control the heat release rate and heat release rate of cement hydration, so as to better control the temperature rise rate and gradient of concrete and prevent concrete cracking. [0003] The hydration heat regulating material can regulate the cement hydration process, reduce the heat release rate of cem...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B28/00C04B26/00
Inventor 张小磊李磊王文彬田倩刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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