摘要
以河砂最紧密堆积空隙率为基础,提出了一种活性粉末混凝土(RPC)的配合比设计方法,并进行了试验验证和配合比优化。结果表明,河砂RPC的流动度随浆体富余系数的增大而增大,随水胶比的降低而减小;河砂RPC的抗压强度随浆体富余系数增大和水胶比的降低而增大;河砂RPC的抗折强度受浆体富余系数和水胶比的影响较小。胶凝材料的比例对河砂RPC各个性能的影响大小是:流动度>抗压强度>抗折强度。掺入玄武岩纤维后,河砂RPC的抗压、抗折和劈裂抗拉强度均不同程度增大,但随着水胶比的降低,纤维对RPC力学性能提升的效果减弱。试验制备出了满足GB/T 31387—2015《活性粉末混凝土》要求的RPC120和RPC140。
Based on the closest packing voidage of river sand, a mix proportion design of reactive powder concrete （RPC） is proposed, validated and optimized. The results show that the fluidity of the river sand RPC increases with the increase of the extra coefficient of paste, and decreases with the decrease of the W/B. The compressive strength of RPC is enlarged with the increase of the extra coefficient and the decrease of the W/B. The extra coefficient of paste and the W/B have little effect on the flexural strength of RPC. The effect degrees of the proportion of binders on the various performance of river sand RPC are： fluidity〉compressive strength〉flexural strength. After mixing basalt fiber, the compressive, flexural and splitting tensile strength of river sand RPC increase to some extent, but with the decrease of W/B, the effect of fiber on the mechanical properties of RPC decreases. RPC120 and RPC140 which meets the specification requirements of GB/T 31387--2015 Reactive Powder Concrete are prepared.
出处
《混凝土与水泥制品》
北大核心
2018年第4期59-64,共6页
China Concrete and Cement Products
关键词
活性粉末混凝土
河砂
玄武岩纤维
配合比设计
浆体富余系数
Reactive powder concrete
River sand
Basalt fiber
Mix proportion design
The extra coefficient of paste
