Porosity,Pore Size Distribution and Chloride Permeability of Shotcrete Modified with Nano Particles at Early Age

作     者：李贺东 闫东明 CHEN Genda XU Shilang LIU Jintao HU Yanjia 

作者机构：Department of Civil EngineeringZhejiang-UniversityHangzhou 310027China Dep-artment of CivilArchitecture&Environment EngineeringMissouri University of Science and TechnologyRollaMissouri65401USA 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2016年第31卷第3期

页      面：582-589页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 081304[工学-建筑技术科学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0702[理学-物理学] 

基　　金：Funded by National Natural Science Foundation of China(Nos.51522905 51379186) 

主　　题：shotcrete nanoparticles chloride penetration resistance compressive strength porosity 

摘      要：Nano particles have been found to be effective in enhancing many properties of regular concretes. However, there is little information on the effect of nano particles on shotcrete. In fact, if similar positive effect of nano particles can also appear in shotcrete, they will greatly benefit the wide application of shotcrete in more and more repair and strengthening of structures in civil engineering, especially in corrosive environments. In this study, through experiments on 70 specimens, the effects of nano SiO2, CaCO3 and Al2O3 particles on the early-age porosity, pore size distribution, compressive strength and chloride permeability of shotcrete were *** results indicated that nano SiO2 particles significantly increased the compressive strength and chloride penetration resistance; nano Al2O3 and CaCO3 particles had slight enhancing effect on the compressive strength; nano CaCO3 particles were most effective in promoting the chloride penetration resistance of shotcrete. As a conclusion, nano SiO2 particles were recommended when both early age compressive strength and chloride penetration resistance were crucial, and nano CaCO3 particles were recommended when only chloride penetration resistance was concerned for their high cost-effectiveness.