硅酸盐通报2023，Vol.42Issue(12)：4408-4415,8.
大掺量磷石膏矿渣水泥的水化历程与长期强度研究
Hydration Process and Long-Term Strength of Gypsum Slag Cement with High Content of Phosphogypsum
摘要
Abstract
A large amount of phosphogypsum,ground granulated blast-furnace slag and slaked lime were employed to prepare the gypsum slag cement.The effect of phosphogypsum content on the hydration process and long-term strength of gypsum slag cement was investigated through hydration heat,chemical shrinkage,pH value of pore solution and compressive strength tests,combined with XRD and SEM-EDS.The results show that the third peak of heat release curves of cement pastes gradually decreases when the phosphogypsum content increases from 40% to 70% (mass fraction,the same below).The chemical shrinkage at 14 d increases from 0.066 mL·g-1 to 0.193 mL·g-1,and chemical shrinkage rate significantly increases during the early hydration stage(0～1 d).The pH value of pore solution tends to stabilize within 28 d.Compared with 28 d compressive strength,the 90 d compressive strength is enhanced by 12.3% ～27.8% .XRD and SEM-EDS reveales that the cement pastes mainly consists of gypsum,quartz,ettringite and C-S-H gel.At the age of 28 d,the ettringite content decreases from 7.48% to 2.84% ,and the Ca/Si ratio(molar ratio)of C-S-H gel increases from 1.08 to 2.24 with the increase of phosphogypsum.关键词
磷石膏/石膏矿渣水泥/粒化高炉矿渣/水化热/化学收缩/水化产物/抗压强度Key words
phosphogypsum/gypsum slag cement/ground granulated blast-furnace slag/hydration heat/chemical shrinkage/hydration product/compressive strength分类
化学化工引用本文复制引用
廖宜顺,汪凯,李豪..大掺量磷石膏矿渣水泥的水化历程与长期强度研究[J].硅酸盐通报,2023,42(12):4408-4415,8.基金项目
国家自然科学基金(51608402) （51608402）
湖北省建设科技计划项目(厅头[2021]2075号-38) （厅头[2021]2075号-38）
