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Investigation on expansion effect of the expansive agents in ultra-high performance concrete

机译：超高性能混凝土膨胀剂膨胀效应的研究

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摘要

In this study, the expansion mechanisms of calcium-sulfoaluminates -CaO based expansive agent (CSA-CaO EA) on the volume stability of ultra-high performance concrete (UHPC) were systematically studied. The test results show that the incorporation of CSA-CaO EA is beneficial to reduce the autogenous shrinkage of UHPC effectively due to the formation of additional Ca(OH)(2) and ettringite. However, the reduction of early autogenous shrinkage is limited and the cracking risk is still very high when the addition of CSA-CaO EA reaches 15% of binders. According to the results, the factors hindering the expansion effect of CSA-CaO EA include the low w/b ratio, compact microstructure, out-sync of time "window" of expansion and shrinkage and the potential exchange of water between solids. Strategies and experimental validations on improving the shrinkage compensation are discussed. It indicates that the expansive UHPC can be prepared by using an CaO based EA with high reactivity and low water consumption via controlling the time "window" of expansion.
机译：在该研究中，系统地研究了钙 - 磺铝酸钙 - 钙 - 膨胀剂（CSA-CaO）对超高性能混凝土（UHPC）的体积稳定性的膨胀机制。测试结果表明，由于额外Ca（OH）（2）和Ettringite的形成，CSA-CaO EA的掺入有益于减少UHPC的自生收缩。然而，当加入CSA-Cao EA达到15％的粘合剂时，早期自生收缩的降低有限，裂缝风险仍然非常高。根据结果​​，阻碍CSA-CAO EA的膨胀效应的因素包括膨胀和收缩的膨胀和收缩的低于W / B比，紧凑的微观结构，超时“窗口”，以及固体之间的水潜在的水交换。讨论了改善收缩补偿的策略和实验验证。它表明，通过使用高反应性和低耗水量来控制扩展的时间“窗口”，可以通过使用高反应性和低耗水量来制备膨胀UHPC。

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