硅酸盐通报2026，Vol.45Issue(5)：1491-1500,10.DOI:10.16552/j.cnki.issn1001-1625.2025.1086
FeSO4·H2O协同DTPA改性氯氧镁水泥的作用机理
Mechanism of FeSO4·H2O Synergistic with DTPA Modified Magnesium Oxychloride Cement
摘要
Abstract
In this study,the effects of ferrous sulfate monohydrate(FeSO4·H2O)and diethylene triamine pentaacetic acid(DTPA)on setting time,mechanical properties,water resistance and microstructure of magnesium oxychloride cement(MOC)were investigated.The mechanism of water resistance improvement of MOC by FeSO4·H2O and DTPA was revealed.FeSO4·H2O and DTPA were added to MOC in different proportion from 0%to 2%(mass fraction).The results show that when 2%FeSO4·H2O and 2%DTPA are added,the performance of MOC is significantly optimized.The initial setting time and final setting time are extended to 339 and 374 min,respectively,which are 120%and 81%higher than those of the control group(without FeSO4·H2O and DTPA).At the same time,the 7 d softening coefficient is increased to 0.9,which is 164%higher than that of the MOC group.The 28 d compressive strength reaches 130 MPa,which is 76%higher than that of the group control,and the porosity is also significantly reduced.This is attributed to the fact that the carboxyl structure of DTPA chelates Mg2+,which provides the active site for Mg2+in the MOC system,so that the 5Mg(OH)2 MgCl2·8H2O(5·1·8 phase)crystals are arranged more closely and the structure is denser.At the same time,the gel-like 5·1·8 phase crystals are formed to fill the micropores between the crystals,thus significantly improving the water resistance of MOC.关键词
氯氧镁水泥/二乙烯三胺五乙酸/一水硫酸亚铁/耐水性/微观结构Key words
magnesium oxychloride cement/diethylene triamine pentaacetic acid/ferrous sulfate monohydrate/water resistance/microstructure分类
建筑与水利引用本文复制引用
宿辉,张林康,白延杰,吕佳鑫,张鑫,南博文,皮浩军..FeSO4·H2O协同DTPA改性氯氧镁水泥的作用机理[J].硅酸盐通报,2026,45(5):1491-1500,10.基金项目
河北省自然科学基金(E202402005,E2020402087) （E202402005,E2020402087）
邯郸市科学技术研究与发展计划(23422903054) （23422903054）
