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Concrete waterproofing agent, preparation method of waterproofing agent and waterproof concrete

A technology of waterproof concrete and waterproofing agent, which is applied in the field of building materials, can solve the problems of accelerating the corrosion of steel bars in concrete and eroding the concrete matrix, and achieves the effects of strong waterproof effect, low production cost and simple preparation method

Active Publication Date: 2021-03-09
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding the above waterproofing agents into concrete will have a great impact on the performance of concrete, such as: chloride ions will accelerate the corrosion of steel bars in concrete, and sulfate ions will corrode the concrete matrix
Therefore, the waterproof means and waterproofing agents currently used have certain defects. In order to adapt to the goal of green development proposed for the construction industry, it is necessary to develop a new type of concrete waterproof material

Method used

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  • Concrete waterproofing agent, preparation method of waterproofing agent and waterproof concrete
  • Concrete waterproofing agent, preparation method of waterproofing agent and waterproof concrete

Examples

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preparation example Construction

[0026] In an exemplary embodiment of the present invention, as figure 1 As shown, the preparation method may include the following steps:

[0027] Such as figure 1 In step S01, the Mg 2+ The magnesium salt solution with a concentration of 0.5-1.5 mol / L is mixed with the bentonite at a mass ratio of 15:1-25:1 to obtain a bentonite slurry. Among them, if Mg in the magnesium salt solution 2+ If the concentration is too low, the modification effect will be poor. When the solution concentration exceeds 1.5mol / L, the modification effect will hardly be improved. Therefore, from the modification effect and economic point of view, the Mg 2+ The concentration range of 0.5 ~ 1.5mol / L. The main mineral component of bentonite is montmorillonite. The ratio of magnesium salt solution and bentonite is mixed at a ratio of 15:1 to 25:1 because this ratio is conducive to the exchange of cations between montmorillonite layers and the modification of magnesium ions. If the ratio is greater tha...

example 1

[0038] A preparation method of a self-repairing waterproofing agent for concrete is: configuring 1mol / L of Mg(NO 3 ) 2 Pour the solution into a container and place it on a magnetic stirrer. After dissolving it evenly at 30°C and 500rpm, add a certain amount of natural sodium base in a ratio of 25:1 (that is, the mass ratio of magnesium salt solution to bentonite). Bentonite. Raise the temperature to 80°C and stir for 8h at 1000rpm. After aging the reacted bentonite slurry for 12 hours, it is subjected to vacuum filtration, and the bentonite is repeatedly washed with water for 2 to 3 times during the suction filtration process. The bentonite after suction filtration was dried at 85°C for 12 hours, then crushed by a pulverizer, passed through a 200-mesh sieve, and sealed to obtain the waterproofing agent.

[0039] Performance test results:

[0040] The magnesium-based bentonite waterproofing agent prepared by the above method was mixed into the mortar according to the cement...

example 2

[0042] A preparation method of a self-healing waterproofing agent for concrete is: configuring 1.5mol / L of Mg(NO 3 ) 2 Pour the solution into a 2L beaker and place it on a magnetic stirrer. After dissolving it evenly at 30°C and 500rpm, add a certain amount of natural Sodium bentonite. Raise the temperature to 70°C and stir for 6h at 1200rpm. After aging the reacted bentonite slurry for 12 hours, it is subjected to vacuum filtration, and the bentonite is repeatedly washed with water for 2 to 3 times during the suction filtration process. The bentonite after suction filtration was dried at 85°C for 12 hours, then crushed by a pulverizer, passed through a 200-mesh sieve, and sealed to obtain the waterproofing agent.

[0043] Performance test results:

[0044] The magnesium-based bentonite waterproofing agent prepared by the above method was mixed into the mortar according to the cement content of 6%. Compared with the blank group, the water penetration pressure ratio was 290...

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Abstract

The invention provides a waterproofing agent with self-repairing effect on concrete, a preparation method and a waterproof concrete. The method comprises the steps of: Mg 2+ A magnesium salt solution with a concentration of 0.5-1.5 mol / L is mixed with bentonite at a mass ratio of 15:1-25:1 to obtain a bentonite slurry, wherein the bentonite is sodium-based bentonite and / or calcium-based bentonite; Stir the bentonite slurry evenly, then age and filter to obtain a precipitate; dry and pulverize the precipitate to obtain the waterproofing agent. The waterproofing agent includes the waterproofing agent prepared by the above method. The concrete includes cement, sandstone and the above-mentioned waterproofing agent. The beneficial effects of the present invention include: the preparation method is simple, the production cost is low, and the source of raw materials is wide; the waterproof agent has good compatibility with concrete and can achieve the purpose of permanent waterproof; the waterproof concrete has excellent waterproof performance and Strong self-healing effect.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a waterproofing agent with self-repairing effect on concrete, a preparation method of the waterproofing agent, and a waterproof concrete. Background technique [0002] Concrete is currently the largest man-made material used by humans. During the maintenance or service of concrete, due to the interface transition zone, dry shrinkage, chemical shrinkage, temperature shrinkage, creep and other phenomena or the effect of external loads, it will form inside. Pores and microcracks of different sizes. The existence of these pores and microcracks will directly lead to the reduction of the anti-permeability of the concrete structure, resulting in the decline of the waterproof performance of the concrete. With the penetration of water inside the concrete, it will also cause accelerated deterioration of concrete performance, and the durability of concrete will also drop significantly. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/08C04B22/12C04B28/00C04B103/65
CPCC04B28/00C04B40/0039C04B2103/65C04B2111/28C04B22/085C04B14/104C04B22/12C04B14/06
Inventor 赖振宇胡洋卢忠远吕淑珍
Owner SOUTHWEAT UNIV OF SCI & TECH