Abstract

This paper presents the influence of ceramic waste powder (CWP) inclusion on the physico-mechanical properties and microstructure analysis of alkali-activated pastes prior and after exposure to elevated temperatures. Such geopolymer specimens were designed upon replacing ground granulated blast-furnace slag (GGBFS) with CWP at ratios of 0%, 5%, 10%, 15% and 20%, by mass. The water absorption and compressive strength (wet and dry) of non-exposed samples were determined at curing ages of 1, 7, 14 and 28 days. After that, the specimens were exposed to high temperatures of 200, 400, 600 and 1000 °C with a heating rate of 5 °C/min. The characteristics of tested samples such as visual inspection, residual compressive strength and microstructure were evaluated. Techniques as Fourier Transform Infrared spectroscopy (FTIR), Thermogravimetric Analysis (TGA/DTG) and Scanning Electron Microscopy (SEM) were used for studying molecular and microstructure of geopolymer composite. Results indicated that the inclusion of CWP with slag in composite structure based geopolymer enhanced the physico-mechanical properties and microstructure of mixtures before and after thermal exposure. The specimens made of 15% CWP displayed superior thermal stability in terms of remaining compressive strength and microstructure than the reference ones.

摘要

本文介绍了陶瓷废粉 (CWP) 夹杂物对暴露于高温之前和之后的碱活化浆料的物理机械性能和微观结构分析的影响。这种地质聚合物样品是在用 CWP 以 0%、5%、10%、15% 和 20% 的质量比替代磨碎的粒状高炉渣 (GGBFS) 后设计的。在固化 1、7、14 和 28 天时测定未暴露样品的吸水率和抗压强度（湿和干）。之后，将试样暴露在 200、400、600 和 1000 °C 的高温下，升温速率为 5 °C/min。评估了测试样品的特性，例如外观检查、残余抗压强度和微观结构。傅里叶变换红外光谱 (FTIR) 等技术，热重分析 (TGA/DTG) 和扫描电子显微镜 (SEM) 用于研究地质聚合物复合材料的分子和微观结构。结果表明，在复合结构地质聚合物中加入矿渣 CWP 可增强混合物在热暴露前后的物理力学性能和微观结构。由 15% CWP 制成的试样在剩余抗压强度和微观结构方面显示出优于参考试样的热稳定性。