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首页> 外文会议>Proceedings of the 2nd international symposium on Asia urban geoengineering >Synthesis and Characterization of Metakaolin Modified Waste Concrete-Based Geopolymer
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Synthesis and Characterization of Metakaolin Modified Waste Concrete-Based Geopolymer

机译：偏高岭土改性废弃混凝土基聚合物的合成与表征

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摘要

Demolition of construction work generates a significant amount of waste concrete. Most of waste concrete is disposed in landfill, which is costly and occupies vast expanses of land and also causes environmental problems. Currently, the utilization of waste concrete is limited to the utilization of recycled aggregates in non-structure filler and pavement base. This study investigates the feasibility of utilizing waste concrete powder to synthesize geopolymeric binder. The obtained geopolymeric binder can be mixed with recycled aggregates to synthesize new geopolymeric concrete. Due to the high silicon and calcium content for the waste concrete powder, metakaolin is used to optimize the silicon, aluminium and calcium content. The unconfined compressive strengths (UCS) of the geopolymeric binders synthesized at different alkaline activator concentrations and metakaolin contents are evaluated and the optimal values of them are determined. The microstructure and phase compositions of the source materials and the synthesized geopolymeric binders are studied base on SEM/EDS and XRD analyses. The results show that the UCS of geopolymeric binder increases with the addition of metakaolin up to 80% content and then decreases. Therefore, adding proper content of metakaolin to waste concrete powder, the strength of geopolymeric binder can reach the required value.
机译：拆除建筑工程会产生大量的废混凝土。大部分废混凝土被丢弃在垃圾填埋场中，这是昂贵的并且占据了广阔的土地，并且还引起了环境问题。目前，废弃混凝土的利用仅限于在非结构性填料和路面基层中利用再生骨料。这项研究调查了利用废弃的混凝土粉末合成地聚合物粘合剂的可行性。可以将获得的地质聚合物粘合剂与回收的骨料混合，以合成新的地质聚合物混凝土。由于废混凝土粉中硅和钙的含量很高，因此偏高岭土可用于优化硅，铝和钙的含量。评价了在不同的碱性活化剂浓度和偏高岭土含量下合成的地聚合物基的无侧限抗压强度（UCS），并确定了它们的最佳值。在SEM / EDS和XRD分析的基础上，研究了原料和合成的地聚合物粘合剂的微观结构和相组成。结果表明，随着偏高岭土含量的增加，地聚合物粘结剂的UCS含量增加至80％，然后下降。因此，在废混凝土粉中添加适量的偏高岭土，地聚合物粘结剂的强度可以达到要求的值。

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