现代应用物理2024，Vol.15Issue(2)：191-201,11.DOI:10.12061/j.issn.2095-6223.2024.021202
引气剂调节水泥基微膨胀材料波阻抗的研究
Regulation of Wave Impedance of Cement-based Micro-Expansive Materials by Air Entraining Admixture
摘要
Abstract
In this paper,cement-based micro expansion backfill material is prepared by using 52.5R ordinary portland cement,ground granulated blast furnace slag,intermediate sand,air entraining admixture,water-reducing admixture,expansive material,and other raw materials.Its density and wave velocity are adjusted by changing the water-cement ratio,sand-cement ratio and air-entraining admixture mixing amount to match the wave impedance of the hard rocks.And its fluidity and vertical expansion rate are adjusted to meet the requirements of backfill construction.On this basis,the effect of water cement ratio,sand cement ratio,and air entraining agent mass fraction on the compressive strength,porosity,and wave impedance of cement-based micro expansion materials is studied.The results show that the addition of air entraining admixture introduces air bubbles inside the cement-based micro expansion materials.With the increase of the dosage of air entraining admixture,the internal porosity of the cement-based micro expansion materials gradually increases,and the compressive strength,density,wave velocity,and wave impedance all decrease.The prepared cement-based micro expansion materials can meet the range of wave impedance of 4.67～10.3 kt·m-2·s-1.It can match the wave impedance of various kinds of common hard rocks.The multiple linear regression analysis of 28 d wave impedance of cement-based micro expansion materials yields a regression model with high accuracy and better grouting effect in practical application,which can be used for the rapid preparation of rock wave impedance matching materials.关键词
波阻抗/引气剂/水泥基材料/孔结构/微膨胀Key words
wave impedance/air entraining admixture/cementitious materials/pore structure/micro expansion分类
建筑与水利引用本文复制引用
王雨彤,唐仕英,李国新,牛梦蝶..引气剂调节水泥基微膨胀材料波阻抗的研究[J].现代应用物理,2024,15(2):191-201,11.基金项目
陕西省自然科学基金资助项目(2021JM-366) （2021JM-366）
