Alloy powder concrete waterproofing agent and preparation method thereof

Abstract

The invention provides an alloy powder concrete waterproofing agent. The alloy powder concrete waterproofing agent is characterized by being prepared from the following materials in percentage by mass: 79-94% of an aluminum oxide alloy compound, 5-20% of a magnesium oxide alloy compound, 0.2-0.4% of benzoates, 0.2-0.4% of alkylol amines, 0-0.1% of alkyl sodium sulfonate and 0.1-0.2% of nano-silicon dioxide. The alloy powder concrete waterproofing agent has the advantages that by virtue of the functions of reducing water, adsorbing, diffusing and introducing air, the structural distribution of internal holes in concrete is changed and the porosity is remarkably reduced, so that sealed bubbles can be generated in the concrete, and the bleeding rate can be reduced; meanwhile, the internal holes in the concrete are filled, so that the anti-penetrability performance of the concrete in the later period can be greatly improved.

Description

Technical field [0001] The invention relates to a concrete admixture, which is a novel powdery material used for concrete waterproofing. Background technique [0002] With the expansion of the application scope and application fields of concrete materials and the improvement of engineering quality requirements, the durability of concrete structures has gradually emerged. In recent decades, cases of structural damage caused by concrete durability problems in construction projects have emerged endlessly and frequently. According to a related survey in 2001, 3,000 porous reinforced concrete beams across the country had corrosion of steel bars, and 2,300 porous prestressed concrete beams had alkali-aggregate reactions. The investment in reinforcement and repair was about 400 million yuan. The durable failure of concrete or structural damage has attracted great attention from academia, engineering, design units and government departments. The durability of concrete structures has bec...

AI Technical Summary

Problems solved by technology

my country developed graded aggregate waterproof concrete in the 1950s. During preparation, in order to make the coarse and fine aggregate gradation meet the requirements of the ideal gradation curve, part of the sand and gravel must be discarded, which is time-consuming and material-consuming, and it is difficult to popularize and apply it in engineering.

In the 1960s, the technology of rich mortar waterproof concrete was proposed. This technology has the disadvantages of large amount of cement and low strength of waterproof concrete. These two technologies have not fundamentally solved the problem of leakage caused by shrinkage and cracking of concrete.

[0007] Modern concrete technology requires waterproof concrete to have comprehensive properties such as high impermeability, high strength, and pumpability. Therefore, it is difficult to use a single plasticizing water-reducing component, hydrophobic component, expansion component or air-entraining component to meet the engineering requirements. quality requirements