基于相对介电常数的新拌混凝土拌合物含水率测定方法与模拟

Determination of Water Content of Fresh Concrete Mixture Based on Relative Dielectric Constant and Modeling

本文提出了一种利用探地雷达测试水泥砂浆和混凝土拌合物相对介电常数、进而推算其含水率的新方法,研究并测试分析了矿物掺合料、温度、集料等因素对测试结果的影响,建立了新拌混凝土相对介电常数的计算模型。研究结果表明,探地雷达测得的拌合物的相对介电常数与拌合物含水率之间具有很好的线性相关性,基于拌合物的相对介电常数可以准确测量拌合物的含水率。建立的模型对于各个配合比的混凝土有良好的适应性,通过测定混凝土拌合物的相对介电常数,利用该模型可直接计算其含水率。

A new method for determining the water content of fresh mortar and concrete mixture using Ground Penetrating Radar（GPR） was proposed in this paper.The water/cement ratios of concrete and mortar mixtures are derived based on the relative dielectric constant.Effects of mineral admixtures,temperature and aggregate state on the relative dielectric constant were investigated as well.A model for the relative dielectric constant of fresh concrete mixture was established.The experimental results show that there is a linear relation,between the water content and its relative dielectric constant.Thus,based on the relative dielectric constant the water content of concrete mixtures can be calculated.The model has good adaptability and can be used to calculate the water content in fresh concrete mixture by measuring its relative dielectric constant.