防灾减灾工程学报2023，Vol.43Issue(6)：1425-1433,9.DOI:10.13409/j.cnki.jdpme.20220504003
硫酸盐侵蚀作用下纳米混凝土力学特性及微观结构劣化机制研究
Study on Mechanical Properties and Microstructure Deterioration Mechanism of Nano-concrete under Sulfate Attack
摘要
Abstract
Sulfate attack has always been an important factor affecting the durability of concrete,espe-cially in the northwest cold and arid regions,and coastal saline soil area of China.Based on experi-ments,the compressive strength,axial stress-strain and microstructure properties of concrete modi-fied with nano-SiO2 and nano-CuO under the influence of sulfate attack were studied,and the strength-ened effect of nano-materials was analyzed.The results show that with the increase of nano-CuO con-tent,the compressive strength and residual strength coefficient of concrete gradually decreased.When the content of nano-SiO2 increases,the compressive strength and residual strength coefficient first de-crease and then increase.Compared with the concrete without adding nano-materials,the addition of nano-materials can improve the ductility of concrete.With the increase of erosion time,the ductility of nano-concrete is better.Meanwhile,there is an optimum content of nano-materials for improving the compressive strength of concrete,and the optimum contents of nano-SiO2 and nano-CuO are 3%and 1%(quality score),respectively.Additionally,nano-materials have a certain bridging and filling ef-fect,which might affect the degree of crack propagation,refine the pore structure and improve the compactness of nano-concretes,thereby improving the mechanical properties of concrete.关键词
纳米材料/抗压强度/应力-应变/微观特性/硫酸盐侵蚀Key words
nano-materials/compressive strength/stress-strain/microstructure/sulfate erosion分类
土木建筑引用本文复制引用
张嘉成,万旭升,路建国,高佳佳,刘骏霓,周晓曼..硫酸盐侵蚀作用下纳米混凝土力学特性及微观结构劣化机制研究[J].防灾减灾工程学报,2023,43(6):1425-1433,9.基金项目
国家自然科学基金(42101136,42071087)、四川省自然科学基金(2022NSFSC0429)、中国博士后科学基金(2021M692697)、冻土工程国家重点实验室开放基金(SKLFSE202007)、四川省科技计划项目(2021YFQ0021)资助 （42101136,42071087）
