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超高性能混凝土(UHPC)因其具有优异的力学性能和耐久性，在世界上得到了广泛的研究和应用。然而，UHPC作为一种水泥含量高的水泥基材料，会产生昂贵的生产成本以及较大的环境危害。通过使用辅助胶凝材料(SCMs)替代UHPC中的水泥，已经成为一种减少水泥消耗的有效途径。近年来，赤泥(RM)常被用作辅助胶凝材料部分取代水泥。但之前的研究表明，由于RM的反应性低，RM的加入可能会使UHPC性能降低。众所周知，胶凝材料中的铝相可以与碳酸钙发生协同作用，促进水化产物的形成，提高基体的性能。由于RM中含有丰富的铝相，将RM与石灰石粉(LP)协同替代部分水泥，开发出一种可持续的UHPC。通过力学试验、水化热分析、X射线衍射测试、孔隙率测试以及碳排放测试，研究了RM的掺量对UHPC力学性能、水化、孔隙结构以及碳排放的影响。结果表明，掺入RM和LP的UHPC早期强度普遍低于参考组，但由于RM、LP和水泥之间的协同作用，其后期强度发展迅速。随着RM掺量的增加，RM的成核效应及其提供的高碱度环境会导致主放热速率峰出现时间提前，水化反应加速。由于RM的填充作用以及RM、LP和水泥之间的协同作用，RM和LP的复合添加可以降低UHPC基体的孔隙率。此外，RM和LP的加入有效降低了UHPC的碳排放。
Abstract：Ultra-high-performance concrete(UHPC) has been widely studied and applied in the world because of its excellent mechanical properties and durability. However, as a cement-based material with high cement content, UHPC can lead to higher production costs and greater environmental harm. The use of supplementary cementitious materials(SCMs) to substitute the cement in UHPC has become an effective way to reduce cement consumption. In recent years, red mud(RM) is frequently used as a supplementary cementitious material to partly replace cement. However, previous studies have shown that incorporating RM may undermine the performance of UHPC due to its low reactivity. It is well known that the aluminum phase in cementitious materials can synergistically interact with carbonate to promote the production of hydration products and improve the performance of the matrix. Since RM is rich in aluminum phase, a sustainable UHPC is developed in this study by a synergistic use of RM and limestone powder(LP) to partially substitute cement. The effects of the admixture amount of RM on the mechanical properties, hydration, pore structure and carbon emission of UHPC are investigated through mechanical tests, calorimetry analysis, X-ray diffraction, porosity tests and carbon emission tests. The results show that UHPC incorporated with RM and LP generally exhibits lower early-age strength than the reference mix, but its late-age strength develops more rapidly due to the synergistic reaction among RM, LP and cement. As the RM dosage increases, the main exothermic rate peak occurs earlier and the hydration reaction is accelerated owing to the nucleation effect and high alkalinity of RM. The coupled addition of RM and LP could lower the porosity of UHPC matrix due to RM's filling effect and the synergistic effect among RM, LP and cement. Moreover, the incorporation of RM and LP effectively reduces the carbon emissions of UHPC.
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基本信息:
中图分类号:TU528
引用信息:
[1]陈强,黄悦.赤泥-石灰石粉超高性能混凝土的力学性能及水化研究[J].青岛理工大学学报,2024,45(06):10-17.
基金信息:
山东省自然科学基金资助项目(ZR2021ME201); 山东省泰山学者项目(tsqn201909127)
2023-09-28
2023
2023-10-19
2024-10-14
2024
2
2024-12-27
2024-12-27