硬化混凝土中单位水泥用量的测定

摘要

A method was introduced to determine unit cement content by oxide analysis of hardened concrete.Dissolved in ice hydrochloric acid of hardened concrete were measured by soluble silica content and concrete absolute dry density to calculate the cement content in concrete,the experiment results showed that the most value by method of silicon was close to the design of mix ratio.Addition of fly ash had little effect on the determination results,and adding slag powder would make the result higher.The relative standard deviation of five determination results was less than 2.4％.This method can be used for the actual concrete unit cement content determination.%介绍一种通过氧化物分析法测定硬化混凝土中单位水泥用量的测定方法.采用冰盐酸溶解硬化混凝土,测定滤液中可溶性二氧化硅含量及混凝土的绝对干密度来计算混凝土中单位水泥用量,结果表明此方法测定的单位水泥用量与设计的配合比值大部分较为接近,掺加粉煤灰对测定结果影响较小,掺加矿渣粉则使测定结果偏高.5次测定结果的相对标准偏差在2.4％以内,可用于实际混凝土中单位水泥含量的测定.