Concrete preservative

Abstract

The invention relates to a concrete admixture, in particular to a composite cement preservative which can enhance the salty ion erosion resistance, freezing-thawing cyclic damage resistance and penetration resistance of concrete. The concrete preservative disclosed by the invention comprises the following components in percentage by weight: 30.0-50.0 percent of mineral admixture, 30.0-50.0 percent of expanding agent, 5.0-10.0 percent of corrosion inhibitor, 0.001-0.005 percent of air entraining agent and 1.0-10.0 percent of water reducing agent. By adopting the concrete preservative disclosed by the invention, the compactness of concrete can be enhanced, the concentration of sulfate ions capable of invading concrete can be lowered, the pore diameters of capillary pores can be reduced and the precipitating speed of calcium hydroxide from set cement can be restrained, so that the structural durability of concrete is enhanced. The concrete preservative is suitable for reinforced concrete structures in unfavorable geological regions, such as coal measure strata containing sulfate and magnesium and chloride ions, sulfide ore strata, seashore saline fields, coastal harbors and the like, as well as marine waters.

Description

technical field [0001] The invention belongs to a concrete admixture, and in particular relates to a composite concrete preservative that can effectively improve concrete anti-salt ion erosion, anti-freeze-thaw cycle damage and anti-permeation performance. Background technique [0002] Coastal ports, salt pans, saline soil areas, groundwater, seawater, rotting organic matter and industrial wastewater contain a large amount of sulfate. Sulfate ions penetrate into concrete and react with cement hydration products to form expansive corrosion products. Internal stress is generated inside the concrete. When the internal stress exceeds the tensile strength of the concrete, the concrete will crack, peel off, etc., so that the concrete will be damaged due to the loss of strength and bonding performance, and the structural expectations cannot be achieved. life. In the above-mentioned erosive regions, the durability of reinforced concrete structures has become a worldwide concern. T...

AI Technical Summary

Problems solved by technology

Sulfate-resistant cement, however, is in limited supply and expensive

More importantly, sulfate-resistant cement has poor ability to prevent corrosion of steel bars caused by chloride salts, which seriously affects the durability of reinforced concrete structures in eroded areas.

Although increasing the concrete protective layer can delay the corrosion of concrete, it increases the cost