Application of silane composite emulsion as anti-cracking reinforcing agent

A technology of composite emulsion and reinforcing agent, which is applied in the field of cement-based materials, can solve the problems of cement matrix strength decline and influence of cement hydration rate, etc.

Active Publication Date: 2021-08-31
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of concrete solidification and hardening, the cracking problem caused by concrete shrinkage has been unavoidable
However, after the two materials form a film, it will affect the cement hydration rate, resulting in a decrease in the strength of the cement matrix.

Method used

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  • Application of silane composite emulsion as anti-cracking reinforcing agent
  • Application of silane composite emulsion as anti-cracking reinforcing agent
  • Application of silane composite emulsion as anti-cracking reinforcing agent

Examples

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preparation example Construction

[0049] In the present invention, the preparation method of the silane composite emulsion preferably comprises the following steps:

[0050] (1) first mixing the first emulsifier, isobutyltriethoxysilane, butyl acrylate and dispersant to obtain an oil phase;

[0051] (2) The second emulsifier, magnesium oxide and water are mixed for the second time to obtain an aqueous phase;

[0052] (3) adding the oil phase and tetraethoxysilane to the water phase for emulsification reaction to obtain a silane composite emulsion;

[0053] There is no time sequence limitation between the steps (1) and (2).

[0054] In the present invention, the first emulsifier, isobutyl triethoxysilane, butyl acrylate and dispersant are first mixed to obtain an oil phase. In the present invention, a homogenizer is preferably used for the first mixing, the speed of the first mixing is preferably 1000-2200r / min, more preferably 1500-2000r / min; the temperature of the first mixing is preferably 30-65°C , more pr...

Embodiment 1

[0067] Preparation of silane composite emulsion, raw materials include:

[0068]

[0069]

[0070] The preparation method comprises the following steps:

[0071] (1) Use a homogenizer to perform the first stirring and mixing of EmcolPL-50, isobutyltriethoxysilane, butyl acrylate and dispersant at a mixing speed of 2000r / min and a temperature of 40°C to obtain an oil phase;

[0072] (2) Use a homogenizer to carry out the second stirring and mixing of TWEEN 20, magnesium oxide and water, the mixing speed is 2000r / min, and the temperature is 40°C to obtain the water phase;

[0073] (3) The oil phase is added dropwise to the water phase, and stirred at a constant temperature at 40°C. After the dropwise addition is completed, the emulsification reaction is carried out under stirring at 2500r / min. The temperature of the emulsification reaction is 50°C, and the time is 4h, to obtain Silane complex emulsion;

[0074] The flow chart of the preparation method is as figure 1 sho...

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Abstract

The invention provides application of a silane composite emulsion as an anti-cracking reinforcing agent in a cement-based material, belonging to the technical field of cement-based materials. According to the invention, active groups on isobutyltriethoxysilane molecules react with hydroxyl groups on the surface of mortar to form a layered hydrophobic structure, so the loss of water in the mortar made of a cement-based material is slowed down, and cracking caused by drying shrinkage is avoided; after butyl acrylate is dehydrated, a net-shaped structure is formed and fills in pores of the cement-based material, so the shrinkage of the cement-based material is inhibited, and cracking caused by the shrinkage is further reduced; tetraethoxysilane can undergo a hydrolysis reaction at room temperature to generate nanometer silicon dioxide with a large amount of hydroxyl groups on the surface, the nanometer silicon dioxide and calcium hydroxide in cement can undergo a secondary hydration reaction to form a secondary hydration product C-S-H gel, so most of gaps are filled, a cement hydration product is more compact in structure, and thus, mortar strength is improved; and the micro-expansion effect of magnesium oxide continuously supplements the effect of the emulsion.

Description

technical field [0001] The invention relates to the technical field of cement-based materials, in particular to the application of silane composite emulsion in cement-based materials as an anti-crack reinforcing agent. Background technique [0002] Concrete is a typical cement-based material, which is widely used in roads, bridges, dams and other projects because of its easy availability and relatively low price of raw materials. However, in the process of concrete setting and hardening, the problem of cracking caused by concrete shrinkage has been unavoidable. For ordinary concrete, drying shrinkage accounts for about 80% to 90% of the total shrinkage, which is the main factor causing concrete cracking. Drying shrinkage is due to the fact that the relative humidity inside the concrete is higher than the relative humidity of the external environment, so that the internal moisture is quickly lost. When the water is lost, the water level inside the capillary in the material d...

Claims

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Application Information

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IPC IPC(8): C04B24/42
CPCC04B40/0039C04B24/42C04B24/045C04B22/066C04B2103/0068C04B24/28Y02W30/91
Inventor 李绍纯徐士林刘昂耿永娟侯东帅张瑞永金祖权高嵩
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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