硅酸盐通报2023，Vol.42Issue(12)：4208-4215,8.
长期低温环境对氯氧镁水泥微观结构及力学性能的影响
Effect of Long-Term Low Temperature Environment on Microstructure and Mechanical Properties of Magnesium Oxychloride Cement
摘要
Abstract
In order to reveal the durability of magnesium oxychloride cement(MOC)under long-term low temperature environment,the effect of freezing time on microstructure,phase composition and mechanical properties of MOC samples were investigated by SEM,MIP,XRD,TG-DSC,FT-IR and microcomputer electro-hydraulic servo pressure testing machine.The results show that MOC samples have good long-term low temperature frost resistance.After 12 months of long-term low temperature freezing experiment,the weight of MOC samples only increases by 0.9% .The microscopic morphology changes from fine needle-like and gel-like to thicker needle-like and gel-like block.The microporous structure does not change significantly,with the average pore diameter varying between 38 and 48 nm and the pore volume distribution(0.01 μm to 0.1 μm)fluctuating from 70% to 80% .The phase composition does not change significantly,and the content of the main strength phase 5Mg(OH)2·MgCl2·8H2 O(5·1·8 phase)only decreases by 3% .The mechanical properties decrease slightly,in which the compressive strength decreases by 3.4 Mpa and the flexural strength decreases by only 2.6 Mpa.关键词
氯氧镁水泥/长期低温环境/微观结构/力学性能/抗冻性能Key words
magnesium oxychloride cement/long-term low temperature environment/microstructure/mechanical property/frost resistance分类
化学化工引用本文复制引用
常成功,安凌云,董金美,郑卫新,文静,阎峰云,肖学英..长期低温环境对氯氧镁水泥微观结构及力学性能的影响[J].硅酸盐通报,2023,42(12):4208-4215,8.基金项目
青海省应用基础研究(2021-ZJ-737) （2021-ZJ-737）
青海省"昆仑英才·高端创新创业人才"拔尖人才 （）
青海民族大学研究生精品示范课程(JK-2022-09) （JK-2022-09）
