水玻璃改性水泥对细粒尾矿胶结性能的影响

Effects of Water Glass Modified Cement on the Performances of Cemented Fine Tailings

这是一篇陶瓷及复合材料领域的论文。为了研究水玻璃对水泥水化反应和细粒尾矿胶结充填材料(CTB)性能的影响机理,采用抗压强度测试、X射线衍射(XRD)、热重(TG)、扫描电子显微镜(SEM)等技术手段探究了水玻璃掺量对CTB抗压强度以及水泥水化产物和微观形貌的影响。结果表明,在一定范围内,水玻璃的掺入能够消耗试样中的Ca(OH)_(2),生成大量C-S-H凝胶,形成致密的微观结构,有助于强度的快速发展。由于水泥体系中的Ca(OH)_(2)被完全消耗,水玻璃掺量的进一步增加并未显著提高C-S-H凝胶的生成量,导致CTB抗压强度的强度增长幅度减弱。

This is an essay in the field of ceramics and composites.To study the effect of water glass on the hydration reaction of cement and performances of cemented fine tailings backfilling materials(CTB),compressive strength test,X-ray diffraction(XRD),thermogravimetric(TG),scanning electron microscope(SEM)were used to investigate the effects of water glass dosage on the compressive strength of CTB,hydration products,and microstructure of cement pastes.The results showed that,for a given range,the addition of water glass consumed the Ca(OH)_(2) in samples and generated large amounts of calcium silicate hydrate(C-S-H)gels,forming a compact microstructure,which was beneficial for the rapid development of strength.However,the further increase in the water glass dosage did not significantly improve the quantities of C-S-H gels because the Ca(OH)_(2) in cement system was completely consumed,leading to a weak enhancement in the strength of CTB.