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Additive capable of improving strength of cement-based material, and preparation method and application thereof

A technology of cement-based materials and admixtures, which is applied in the early and late strength enhancement of cement-based materials, and in the field of admixtures to improve the strength of cement-based materials. There is no obvious improvement in the strength of the material, and the preparation process is complicated. The preparation process is convenient and easy, the early strength and later compressive strength are improved, and the raw materials are easy to obtain.

Active Publication Date: 2017-11-03
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this admixture has the superior effect of greatly improving the strength of concrete, its preparation process is complicated. The formation of the core-shell structure of the admixture involves harsh conditions such as multi-step reactions and an oxygen-free system, which limits its wide application.
[0005] GuYue et al. reported a method for surface PEG modification of nano-silica in their papers. The dispersion and mechanical strength of the modified nano-silica prepared by this method were greatly improved, but the method The raw materials of the modified reagents involved are expensive and the modified reagents are time-sensitive, so they need to be prepared and used immediately
[0006] Patent documents CN201511020283.7 and CN201511009958.8 report the modification method of using a variety of siloxane and silica to improve the impermeability of cement-based materials, but this method has no obvious effect on the strength of cement-based materials

Method used

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  • Additive capable of improving strength of cement-based material, and preparation method and application thereof
  • Additive capable of improving strength of cement-based material, and preparation method and application thereof
  • Additive capable of improving strength of cement-based material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this embodiment, the average particle diameter of nano silicon dioxide A is 15nm, soluble calcium salt B is calcium nitrate (tetrahydrate), soluble silicate C is sodium silicate (pentahydrate), Ca / Si=0.8, dispersant D It is D-1, the relative dosage of D-1 is 25%, and the theoretical quality of the hydrated nano-calcium silicate generated by the reaction is 5% of that of nano-silica A;

[0041] Take 100g of nano-silica A and D-1 solution containing 25g of dispersant D-1, add an appropriate amount of water to stir and mix, and add water to 5L to obtain dispersion Ⅰ-1;

[0042] Take 9.01g of calcium nitrate (tetrahydrate), add 160mL of water to make solution Ⅱ-1, take 10.11g of sodium silicate (pentahydrate), add 300mL of water to make solution Ⅲ-1, at 10°C, stir at 600rpm The solution II-1 and III-1 were dripped into the dispersion I-1 at a constant speed at the same time, and the dropping rate was controlled so that II-1 and III-1 were all dripped in after 1 hour, and...

Embodiment 2

[0044] In this embodiment, the average particle diameter of nano silicon dioxide A is 30nm, soluble calcium salt B is calcium nitrate (tetrahydrate), soluble silicate C is sodium silicate (pentahydrate), Ca / Si=1.0, dispersant D D-1, the relative dosage of D-1 is 15%, and the theoretical mass of hydrated nano-calcium silicate generated by the reaction is 10% of that of nano-silica A;

[0045] Take 100g of nano-silica A and D-1 solution containing 15g of dispersant D-1, add an appropriate amount of water to stir and mix, and add water to 2L to obtain dispersion I-2;

[0046] Take 20.36g calcium nitrate (tetrahydrate), add 100mL water to make solution Ⅱ-2, take 18.27g sodium silicate (pentahydrate), add 180mL water to make solution Ⅲ-2, at 20°C, stir at 450rpm The solution IIII-2 and III-2 were dripped into the dispersion I-2 at a constant speed at the same time, and the dropping rate was controlled so that II-2 and III-2 were all dripped in after 2 hours, and aged for 6 hours to...

Embodiment 3

[0048] In this embodiment, the average particle diameter of nano silicon dioxide A is 100nm, soluble calcium salt B is calcium nitrate (tetrahydrate), soluble silicate C is sodium silicate (pentahydrate), Ca / Si=1.2, dispersant D It is D-1, the relative dosage of D-1 is 10%, and the theoretical mass of hydrated nano-calcium silicate generated by the reaction is 20% of that of nano-silica A;

[0049] Take 100g of nano-silica A and D-1 solution containing 10g of dispersant D-1, add an appropriate amount of water to stir and mix, and add water to 1.2L to obtain dispersion Ⅰ-3;

[0050] Take 44.53g calcium nitrate (tetrahydrate), add 100mL water to make solution Ⅱ-3, take 33.33g sodium silicate (pentahydrate), add 160mL water to make solution Ⅲ-3, at 30°C, stir at 300rpm Under the following conditions, the solutions II-3 and III-3 were dropped into the dispersion liquid I-3 at a constant speed respectively, and the dropping rate was controlled so that after 4 hours, II-3 and III-3 ...

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Abstract

The invention discloses an additive capable of improving the strength of a cement-based material, and a preparation method and application thereof. The additive is prepared by mixing a dispersion liquid I prepared from nanometer silica A and a dispersant D with a solution II of a soluble calcium salt B and a solution III of soluble silicate C, wherein the dispersant D is a polymer with an anionic monomer as the sole or main constitutional unit. According the preparation method, the solution containing the soluble calcium salt and the solution containing the soluble silicate are separately and simultaneously added into a suspension containing the dispersant and nanometer silica particles drop by drop, and a calcium silicate hydrate nanometer gel is allowed to grow on the surface of the nanometer silica in virtue of the seed crystal effect of the nanometer silica, so the calcium silicate hydrate-nanometer silica composite cement additive is obtained; and the additive can substantially improve the early strength and later compressive strength of cement.

Description

technical field [0001] The invention relates to an admixture for improving the strength of cement-based materials, its preparation method and its application, in particular to a simple and efficient compound admixture based on nano-materials that can improve the early strength and later compressive strength of cement concrete , an efficient and controllable preparation method, and its application in early and late strength enhancement of cement-based materials. It belongs to the technical field of building materials. Background technique [0002] Cement-based materials represented by cement and concrete are the core materials of the building materials industry and one of the materials with the highest annual output in the world. For cement-based materials, its mechanical properties and its evolution law are the core indicators in its performance parameters. Rapidly improving the early strength of cement-based materials and enhancing their later strength has always been the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B103/12
CPCC04B40/0039C04B2103/12C04B14/062C04B22/085C04B14/045C04B24/32C04B14/043
Inventor 严涵杨勇舒鑫冉千平黄振李申桐王秀梅
Owner JIANGSU SOBUTE NEW MATERIALS
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