硅酸盐通报2024，Vol.43Issue(6)：1983-1991,9.
养护方式对活性氧化镁水泥水化硬化性能的影响
Effects of Curing Methods on Hydration-Hardening Performance of Reactive MgO Cement
摘要
Abstract
Reactive MgO cement(RMC),which undergoes hardening through the reaction of MgO with water and CO2,is a novel cementitious material that has gained significant attention in recent years.The hydration and carbonation processes of RMC samples are significantly affected by the curing method and water content.This work compared the effects of standard curing((20±1)℃,95％relative humidity),water curing((20±1)℃),and carbonation curing((20±3)℃,70％relative humidity,20％(volume fraction)CO2)on the properties of RMC with water-cement ratio(w/c)of 0.5,0.6,and 0.7,respectively.The types and content of the phases of the hydration and carbonation reaction products as well as their micro-morphological characteristics were investigated.The results show that the residual content of MgO in samples is 10％～15％(mass fraction)at 3 d and disappears at 14 d under standard curing and water curing.When w/c is 0.6,the compressive strength of paste reaches 7.7 and 3.2 MPa at 14 d under standard curing and water curing,respectively.The strength of paste under carbonation curing is superior to that under standard curing and water curing(3d compressive strength,16.19,0.42,and 0.43 MPa,14 d compressive strength,22.34,7.46 and 7.23 MPa).The quantitative analysis results show that the carbonation product is mainly MgCO3·3H2O.When w/c is 0.6,the content of MgCO3·3H2O is 12.12％and 11.29％higher than that of samples with w/c=0.5 and 0.7.The main reason for the optimal compressive strength could lies in that these needle-rod MgCO3·3H2O are bonded to each other form a dense microstructure.关键词
活性氧化镁水泥/水灰比/养护方式/水化/碳化Key words
reactive MgO cement/water-cement ratio/curing method/hydration/carbonation分类
化学化工引用本文复制引用
王焕焕,蔡同舟,侯鹏坤..养护方式对活性氧化镁水泥水化硬化性能的影响[J].硅酸盐通报,2024,43(6):1983-1991,9.基金项目
国家自然科学基金区域创新与发展联合基金(U22A20126) （U22A20126）
山东省自然科学基金(ZR2020YQ33) （ZR2020YQ33）
