Influence of Nanolimestone on the Hydration, Mechanical Strength, and Autogenous Shrinkage of Ultrahigh-Performance Concrete
Influence of Nanolimestone on the Hydration, Mechanical Strength, and Autogenous Shrinkage of Ultrahigh-Performance Concrete
复制标题
纳米石灰石对超高性能混凝土水化、机械强度和自收缩的影响
DOI：
10.1061/(asce)mt.1943-5533.0001327
复制
发表时间：
2016-01-01
影响因子：
3.2
通讯作者：
Shah, Surendra P.
中科院分区：
文献类型：
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作者：
Li, Wengui;Huang, Zhengyu;Shah, Surendra P.
摘要研究了纳米石灰石/纳米碳酸钙（NC）对超高性能混凝土（UHPC）在标准养护和高温养护条件下性能的影响。NC以1%、2%和3%的比例用作水泥的部分质量替代物。由于核化效应，掺加NC加速了UHPC的水化反应。在力学性能方面，发现了一个门槛值的NC含量，使压缩，弯曲强度，和弯曲与压缩强度比的UHPC被发现增加的NC含量向阈值含量增加，然后随着NC含量的增加，当超过阈值时，降低。相反，用NC代替水泥降低了流动性，增加了UHPC的自生收缩量。在加速水泥水化过程的同时，它也作为一种有效的填充材料，导致力学性能提高和更致密的微观结构相比，...
AbstractThe influence of nanolimestone/nanoCaCo3 (NC) on the properties of ultrahigh-performance concrete (UHPC) cured at standard and heat conditions was experimentally investigated. The NC was used at ratios of 1, 2, and 3% as partial mass replacement for cement. Incorporating NC accelerated the hydration reactions of UHPC because of the nucleation effect. On the mechanical properties aspect, a threshold value of the NC content was found so that the compressive, flexural strengths, and flexural to compressive strength ratio of the UHPC were found to increase as the NC content increased towards the threshold content, and then to decrease with the increase of NC contents when the threshold was surpassed. Conversely, replacing cement with NC decreased flowability and increased the amount of autogenous shrinkage of the UHPC. While the NC accelerated the cement hydration process, it also acted as an effective filling material, resulting in enhanced mechanical properties and denser microstructure compared wit...