Method for determining critical adding amount of coal ash in sulfate corrosion resisting concrete for cast-in-place pile

Abstract

The invention discloses a method for determining the critical adding amount of coal ash in sulfate corrosion resisting concrete for a cast-in-place pile. According to the technical scheme, the method is characterized in that the critical adding amount level of the coal ash is calculated through the formula (1) according to the contents of C3S and C2S in adopted cement and the content of SiO2 in the coal ash. According to the method, the defects of traditional rough estimation methods are overcome, the pozzolan effect of the coal ash is utilized to the greatest extent, the maximum function of the coal ash in sulfate corrosion resisting of the concrete is achieved, the situation that too much coal ash possibly brings adverse effects to the concrete is avoided, and bases are provided for ratio optimization design of the sulfate corrosion resisting concrete. A concrete durability test result verifies the accuracy of the method.

Description

technical field [0001] The invention relates to a method for calculating the critical admixture of fly ash in concrete, in particular to a method for estimating the critical admixture of fly ash in sulfate corrosion-resistant concrete for cast-in-situ piles, and belongs to the technical field of civil engineering. Background technique [0002] The sulfate corrosion resistance of concrete structures is one of the main problems in engineering construction, especially in areas rich in sulfates such as coastal and western my country, the problem of sulfate corrosion of concrete structures is more prominent. In the concrete structure, the building foundation is the first and most severely corroded structure, and the cast-in-situ pile is one of the main foundation forms. Therefore, the issue of sulfate corrosion resistance of the cast-in-situ pile foundation is particularly important. Fly ash is the most commonly used mineral admixture. Due to its mineral composition, chemical com...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for determining the critical dosage of fly ash in the sulfate corrosion-resistant concrete of cast-in-place piles, so as to utilize the pozzolanic effect of fly ash to the maximum and play its role in the sulfate-corrosion-resistant concrete of cast-in-place piles. and avoid the adverse effect that excessive fly ash may have on concrete

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