PVA纤维增强钢渣粉-水泥基复合材料基本力学性能及微观结构

《复合材料学报》优先在线发表论文。

摘  要：通过掺加钢渣粉来制备聚乙烯醇(PVA)纤维增强钢渣粉-水泥基复合材料，从宏微观两个方面研究了这种复合材料的性能。考虑了基体材料的水胶比(0.25和0.35)、不同钢渣粉质量分数(0、30%、60%和80%)，采用抗压强度试验、薄板四点弯曲试验研究了PVA纤维增强钢渣粉-水泥基复合材料的基本力学性能变化规律及其在弯曲荷载作用下的裂缝控制能力，采用扫描电镜观测了破坏后试样的微观结构。结果表明，水胶比和钢渣粉掺量均可明显影响试样的基本力学性能，在低水胶比条件下(水胶比为0.25)，钢渣粉掺量达到80%时，试样表现出较高的韧性指数和良好的裂缝控制能力，基本满足工程所需强度要求，水胶比为0.35时钢渣掺量不宜超过60%；同时，从节能减排的角度考虑，利用钢渣粉制备PVA纤维增强钢渣粉-水泥基复合材料是可行的。

关键词：超高韧性；钢渣粉；水泥基复合材料；弯曲韧性；微观结构

Abstract: PVA fiber reinforced cementitious materials containing steel slag powder were prepared by replacing cement by steel slag powder. Both of the basic mechanical and microscopic properties were tested. Two series of PVA fiber reinforced cementitious materials containing steel slag powder with different water to binder ratio, 0.25 and 0.35, were investigated and the mass fraction of steel slag powder were 0, 30%, 60% and 80%. The basic mechanical properties and crack control capacity were investigated through cubic compressive test and four-point bending test. The morphology of PVA fiber reinforced cementitious materials containing steel slag powder was observed via SEM technique. The test results indicate that water to binder ratio and steel slag content can both influence the basic mechanical properties distinctly. The specimens under 0.25 water to binder ratio perform good toughness and crack control capacity, meeting the basic requirements of engineering when the content of steel slag powder up to 80%. The steel slag content should not exceed 60% when the water to binder ratio is 0.35 for good performance. Meanwhile, considering energy saving and emission reduction, it is feasible to use high volume steel slag in producing PVA fiber reinforced cementitious materials containing steel slag powder.

Keywords: ultra high toughness; steel slag powder; cementitious composite materials; flexural toughness; microstructure

作者：韦选纯等，武汉大学 水资源与水电工程科学国家重点实验室，武汉

通讯作者：蔡新华，武汉大学 水资源与水电工程科学国家重点实验室，武汉

全文详见中国知网学术期刊优先数字出版。