硅钙渣复合地聚物水化机理研究

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。

Study on hydration mechanism of calcium silicon slag composite geopolymer

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 of β-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.