Ge Wei, Chen Jun, Min Fanfei, Song Shaoxian, Liu Hui
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wenzhi Street 34, Wuhan 430070, China.
Department of Materials Science and Engineering, Anhui University of Science and Technology, Taifeng Street 168, Huainan 232001, China.
Materials (Basel). 2023 Feb 13;16(4):1552. doi: 10.3390/ma16041552.
Alkali fusion of granite sawdust at a high alkali dosage can significantly improve geopolymerization activity, but also result in a high alkali consumption and a poor geopolymer performance. In this work, quartz, the most inert component in granite sawdust, was selected to explore the effect of low-alkali activation on its reactivity and the compressive strength of geopolymer. It was found that the amount of activated quartz is mainly determined by the amount of alkali used for activation. The surface of a quartz particle can be effectively activated by an alkali fusion process at a low alkali dosage of 5%. The metakaolin-based geopolymer synthesized with quartz activated by an alkali dosage of 5% shows a high compressive strength of 41 MPa, which can be attributed to the enhanced interfacial interaction between quartz and the geopolymer gel, suggesting that low-alkali activation is a potential way to improve the geopolymerization ability of granite sawdust.
在高碱用量下对花岗岩锯末进行碱熔可显著提高地聚合活性，但同时也会导致高碱消耗和较差的地聚合物性能。在本研究中，选择花岗岩锯末中最惰性的成分石英，以探讨低碱活化对其反应活性和地聚合物抗压强度的影响。研究发现，活化石英的量主要由用于活化的碱量决定。在5%的低碱用量下，通过碱熔过程可有效活化石英颗粒表面。用5%碱用量活化的石英合成的偏高岭土地聚合物表现出41MPa的高抗压强度，这可归因于石英与地聚合物凝胶之间增强的界面相互作用，表明低碱活化是提高花岗岩锯末地聚合能力的一种潜在方法。
