Antifreezing concrete

Abstract

The present invention relates to antifreezing concrete, which is prepared by the following components by weight percent: 16.5-17.0% of Portland cement or ordinary Portland cement, 6-7% of water, 26.5-27.5% of fine aggregate, 34.5-37% of coarse aggregate, 12.5-15.0% of a phase change material, and 1.0-2.0% of an additive, wherein the phase-transition temperature of the phase change material is 4.0-6.0 DEG C, and the enthalpy of phase change is 240-270 J / g. The beneficial effects of the invention are that: the antifreezing concrete containing the phase change material provided by the present invention effectively uses the specific thermal performance of the phase change material in order to prevent the occurrence of freezing and thawing cycles or reduce times of suffering freezing and thawing cycles. Therefore, when the temperature is not too low, especially in late autumn, early winter, late winter and early spring, the influence on traffic safety of concrete bridge and road surface from freezing can be effectively prevented. In severe cold areas, the damage or deterioration degree of concrete structures caused by repeated freezing and thawing can be relieved. For concrete projects constructed in winter, concrete before reaching critical strength can be prevented from freezing damage.

Description

Technical field [0001] The invention relates to the technical field of a new type of civil engineering materials, in particular to an antifreeze concrete. Background technique [0002] The industry standard "Ordinary Concrete Mixture Design Regulations" (JGJ55) stipulates that the preparation of antifreeze concrete must be based on strict control of the quality and mixing ratio of raw materials, and by mixing appropriate amounts of antifreeze and / or air-entraining agents to achieve The frost resistance level matched with the service environment. In order to prevent corrosion of steel bars in concrete structures, the use of cheap and efficient antifreezes containing chlorides, nitrites or carbonates is strictly restricted; the incorporation of air-entraining agents may also greatly reduce the strength of concrete and delay its setting Time; high quality management requirements during the construction of antifreeze concrete on-site; the use of deicing salt on roads in winter in co...

AI Technical Summary

Problems solved by technology

In order to prevent the corrosion of steel bars in concrete structures, the use of cheap and efficient antifreeze agents containing chloride salts, nitrites or carbonates is strictly limited; the incorporation of air-entraining agents may also greatly reduce the strength of concrete and delay its setting Time; high quality management requirements during on-site construction of frost-resistant concrete; the use of deicing salt on pavement in cold regions in winter accelerates the deterioration of concrete structures

These defects of traditional frost-resistant concrete seriously restrict its engineering application, and the economic losses and maintenance costs of concrete structures caused by freezing damage increase year by year.

So far, there is no antifreeze concrete that can meet the antifreeze requirements suitable for the service environment without affecting the durability and long-term mechanical properties of concrete structures and components.

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