Testing method of mass concentration of liquid water reducing agent

Abstract

The invention discloses a testing method of the mass concentration of a liquid water reducing agent. The method comprises the following steps that 1, a clean evaporating dish is placed in an oven, dried at the temperature of 100-105 DEG C for 30 min, taken out to be placed in a dryer, cooled for 30 min and then weighed through a ten-thousandth balance, the steps are repeated till constant weight is obtained, and the mass is recorded as m0; 2, 1 ml of a tested sample is taken through a pipette and placed into the evaporating dish; 3, the evaporating dish which contains the sample is placed into the oven, the temperature is raised to 100-105 DEG C for drying, then the evaporating dish is placed into the dryer, cooled for 30 min and then weighed through the ten-thousandth balance, the steps are repeated till constant weight is obtained, and the mass is recorded as m1; 4, the difference value between m2 and m0 is calculated, and the product of V*Xsolid is calculated, wherein Xsolid is the solid content in a powdery water reducing agent by mass percentage; 5, the difference value is divided by the product, and the quotient of the difference value and the product is the mass concentration of the liquid water reducing agent.

Description

technical field [0001] The invention relates to a method for testing the mass concentration of a liquid water reducer. Background technique [0002] The appearance of the water reducer currently used is divided into water and powder. The solid content of water (also known as mother liquor) is generally 20%, 40%, 60%, and the solid content of powder is generally 98%. Liquid superplasticizer has a good dispersion and homogenization effect in concrete, which can reduce the mixing time of concrete and reduce the amount of concrete admixture, so liquid admixture has been widely used in commercial concrete. Now the liquid water reducer is produced by the manufacturer himself by mixing the powder water reducer with a certain amount of retarding components and mixing it into a liquid. Due to the level of operators or other reasons, and in order to prevent artificially increasing the output of liquid superplasticizers during transportation, it is necessary to test the solid content...

AI Technical Summary

Problems solved by technology

Most of the methods currently used to measure the concentration of liquid superplasticizers are determined by the hydrometer method. The measurement error of the hydrometer is relatively large, and it is not sensitive to slight changes in the concentration of the superplasticizer. Therefore, it is not practical in the control of concrete construction and cannot be accurately determined. The concentration of water reducing agent has a great influence on the performance of the prepared concrete

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