Cementing material content measurement method applicable to limestone fine aggregate hardened concrete

Abstract

The invention discloses a cementing material content measurement method applicable to limestone fine aggregate hardened concrete. The cementing material content measurement method applicable to the limestone fine aggregate hardened concrete comprises the following steps: 1.1, sampling and preparing detecting samples, namely, taking two defective concrete samples to be detected, and air-drying to obtain samples A and C, wherein the weight of each of the two defective concrete samples is not less than 4.5 kilograms; 1.2, preparing a comparison standard sample, namely, preparing qualified standard concrete samples B0, respectively packaging the qualified standard concrete samples B0 into three sealed bottles, and respectively taking out the qualified standard concrete samples, namely, B3, B7and B28, according to the age of 3 days, 7 days and 28 days; 1.3, performing a sample dissolution heat measurement method, namely, measuring by using a cement hydration heat measurement meter; preparing dissolving solutions, namely, preparing a mixed solution of about 410 g of a (2.00+ / -0.02) mol / L nitric acid solution and 10 ml of 40 percent hydrofluoric acid, wherein the total mass reaches (425+ / -0.1)g, calculating the dissolution heat of each sample, when the QA / Qtx is greater than or equal to 0.95, judging that the using amount of the cementing material meets a requirement, and when the QA / Qtx is less than 0.95, then judging that the using amount of the cementing material is insufficient.

Description

technical field [0001] The invention relates to the field of building materials, and is especially suitable for the determination method of cement content in concrete using limestone fine aggregate or concrete mixed with high-calcium fly ash. Background technique [0002] Concrete is the most used building material at present, and the amount of concrete increases sharply with the increase of construction scale in our country. In 2006, the national concrete consumption was about 2.1 billion m 3 , reaching 4 billion m in 2010 3 . The poured concrete is generally of good quality, but various quality defects are unavoidable, such as honeycomb pockmarks on the concrete surface, insufficient compressive strength of concrete, and failure of concrete durability to meet requirements. The occurrence of these defects may be formed by one reason, or it may be a combination of multiple reasons. Among them, the insufficient amount of cement is the first factor to be considered when th...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing chemical dissolution method cannot accurately measure the cement content in concrete mixed with high-calcium fly ash or concrete with limestone fine aggregate, and provide a method that can accurately measure the content of cement mixed with high-calcium fly ash. Method of cement content in lime concrete or concrete using limestone fine aggregate

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