Waterproof ultra-high toughness cementitious composites containing nano reservoir silts
Waterproof ultra-high toughness cementitious composites containing nano reservoir silts
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DOI：
10.1016/j.conbuildmat.2017.08.119
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发表时间：
2017-11
影响因子：
7.4
通讯作者：
Hedong Li;Shilang Xu;Q. Zeng
中科院分区：
文献类型：
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作者：
Hedong Li;Shilang Xu;Q. Zeng
水泥基复合材料的防水性能对于其在建筑、装饰、维修等方面的应用至关重要。本文报道了一种具有抗渗功能的超高韧性水泥基复合材料（WUHTCC）。将纳米水库粉砂掺入水泥基复合材料中，可提高水泥基复合材料的防水效果。通过对不同掺量NRSs的WUHTCC的力学性能、微观结构和耐水性能的测试，分析了影响因素。结果表明，随着NRSs荷载的增加，WUHTCCs的韧性保持或提高，但抗压强度降低。随着NRS含量的增加，吸水率降低，渗透压力和渗透时间显著增加。NRS颗粒的掺入使水泥基材料的孔隙率略有增加，但微观形貌没有明显变化。WUHTCC的力学和防水性能的变化是由疏水和片状NRS颗粒引起的，这些颗粒改变了材料基底的表面性质和微观结构。本研究所开发的WUHTCC具有良好的防渗材料性能，有利于其在建筑、装饰和维修领域的应用。
The waterproof ability of cementitious composites is essentially important for the uses in the aspects of construction, decoration and repair. Here we reported a waterproof ultra-high toughness cementitious composite (WUHTCC) that has the function of seepage resistance. The waterproof effect was improved by incorporating nano reservoir silts (NRSs) into the binders of WUHTCC. The mechanical properties, microstructures and water resistances of the WUHTCCs with different loadings of NRSs were tested to assess the affecting factors. The results show that increasing the loadings of NRSs maintains and/or enhances the toughness of WUHTCCs, but decreases the compressive strength. The water absorption is decreased, and the penetration pressure and time are increased significantly with increasing the NRS content. While the incorporation of NRS particles into cementitious matrix leads to a slight increase of porosity, it shows no significant changes of micro morphology. The variations of the mechanical and waterproof properties of WUHTCCs are induced by the hydrophobic and sheet-like NRS particles that alter the surface properties and microstructures of the material substrate. The WUHTCCs with good material properties developed in this study for seepage control facilitate their applications in the fields of construction, decoration and repair.