This paper presents an innovative way of enhancing the residual strength and the dimensional stability after elevated temperature exposures for Alkali Activated Cement (AAC) mortar prepared with recycled glass materials as the principle precursor and fine aggregate. The reference AAC mixture was prepared with Glass Powder (GP) solely as the precursor material. A 28-day compressive strength of slightly over 10 MPa was attained but the samples experienced severe dimensional instability (expansion) after 2 h of exposure to 800 °C. To address this problem, 10% to 25% calcium aluminate cement (CAC) was used to replace the GP and the expansion was effectively controlled when the amount of CAC reached 15%. Also, significant strength increment was attained after the elevated temperature resistance test. The severe expansion of the reference mortar was attributed to the density reduction and volume expansion of the recycled glass materials at the elevated temperature and an extremely porous structure (porosity of over 50%) was resulted after the test. Meanwhile, for the CAC incorporated mixtures, the dehydration of sodium aluminum silicate hydrate at temperature ranging from 250–270 °C enabled sufficient space to accommodate the glass materials expansion. The results show that with the incorporation of CAC, recycled glass dominated AAC mortars that contain higher than 80% total recycled glass materials can be fabricated. A residual strength increment of up to 450% can be obtained while maintaining the original dimension without expansion after the elevated temperature exposure.

本文提出了一种提高以回收玻璃材料为主要前驱体和细骨料制备的碱活性水泥 (AAC) 砂浆在高温暴露后的残余强度和尺寸稳定性的创新方法。参考 AAC 混合物仅使用玻璃粉末 (GP) 作为前体材料制备。获得了略高于 10 MPa 的 28 天抗压强度，但样品在暴露于 800°C 2 小时后经历了严重的尺寸不稳定性（膨胀）。针对这一问题，采用10%~25%的铝酸钙水泥（CAC）替代GP，当CAC用量达到15%时，膨胀得到有效控制。此外，在耐高温测试后获得了显着的强度增量。参考砂浆的剧烈膨胀归因于回收玻璃材料在升高的温度下的密度降低和体积膨胀，并且在测试后产生了极其多孔的结构（孔隙率超过50%）。同时，对于掺入 CAC 的混合物，水合硅酸铝钠在 250-270 °C 的温度范围内脱水，为玻璃材料的膨胀提供了足够的空间。结果表明，通过加入 CAC，可以制造出占总回收玻璃材料 80% 以上的以回收玻璃为主的 AAC 砂浆。在高温暴露后保持原始尺寸而不膨胀的情况下，可以获得高达 450% 的残余强度增量。