硅钙渣复合地聚物水化机理研究  

Study on hydration mechanism of calcium silicon slag composite geopolymer

作　　者：杨志杰 张德 康栋 米世忠 闫长旺 张菊[1,2,3] Yang Zhijie;Zhang De;Kang Dong;Mi Shizhong;Yan Changwang;Zhang Ju(School of Mining and Technology,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;The Key Lab.of Green Development for Mineral Resources,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;Defense in Sandy,Drought and Cold Regions,Inner Mongolia Autonomous Region,Hohhot Inner Mongolia 010051,China;Inner Mongolia Road and Bridge Group Co.,Ltd.,Hohhot Inner Mongolia 010051,China)

机构地区：[1]内蒙古工业大学矿业学院,内蒙古呼和浩特010051 [2]内蒙古工业大学矿产资源绿色开发重点实验室,内蒙古呼和浩特010051 [3]沙旱区地质灾害与岩土工程防御自治区高等学校重点实验室,内蒙古呼和浩特010051 [4]内蒙古路桥集团有限责任公司,内蒙古呼和浩特010051

出　　处：《矿业科学学报》2022年第5期577-584,共8页Journal of Mining Science and Technology

基　　金：内蒙古自然科学基金(2019MS05076);内蒙古科技计划(2020GG0257,2020GG0287);内蒙古工业大学自然重点项目(ZZ201911);内蒙古工业大学博士基金(BS201916)。

摘　　要：为实现硅钙渣、粉煤灰及矿渣三种固废的协同利用,本文通过开展不同粉煤灰、矿渣比(灰渣比)下的硅钙渣复合地聚物制备实验,对硅钙渣复合地聚物的水化机理进行了研究。结果表明,硅钙渣复合地聚物是由β-硅酸二钙自身水化和碱激发水化共同形成的一种以C—S—H和C(N)—A—S—H为主的二元复合胶凝材料;相较于晶相矿物,玻璃相矿物更易发生碱激发水化反应,导致灰渣比在0.5以上时7 d水化物中残存大量未反应的莫来石,但随养护时间的延长莫来石会继续进行水化,并在28 d时生成蠕虫状四方钠沸石和条状贝德石。同时在灰渣比为1.0时,硅钙渣地聚物微观形貌最均匀致密,28 d抗压强度最高,达到37.9 MPa,说明此时能够发挥出粉煤灰、矿渣、硅钙渣之间最佳的协同效应。In order to realize the synergistic utilization of calcium silicon slag,fly ash and blast-furnace slag,this paper researched on hydration mechanism of calcium silicon slag composite geopolymer through preparation experiments of the calcium silicon slag composite geopolymer under different ratio of fly ash/blast-furnace slag.The results show that the calcium silicate slag base geopolymer is a binary composite cementitious material mainly composed of C—S—H and C(N)—A—S—H,which is formed by the hydration ofβ-calcium silicate itself and alkali-activated hydration.Compared with crystalline minerals,glass minerals are more prone to reaction with Ca(OH)_(2) and sodium silicate,resulting in a large amount of unreacted mullite remaining in the hydrates of 7 d when the fly ash/blast-furnace slag ratio is more than 0.5,but the mullite will continue to hydrate with the extension of curing time,and worm-like tetranatrolite and strip-like beidellite will be formed at 28 d.At the same time,when fly ash/blast-furnace slag ratio is 1.0,micromorphology of calcium silicate slag composite geopolymer is the most evenly distributed and dense,and its 28 d compressive strength reaches maximum 37.9 MPa.So,it indicates that the best synergistic effect among calcium silicon slag,fly ash and blast-furnace slag can be released under this condition.

关 键 词：硅钙渣 地聚物 粉煤灰 矿渣 水化物 

分 类 号：X756[环境科学与工程—环境工程]