摘要
为了探究沸石粉替代粉煤灰作辅助胶凝材料制备混凝土的可行性,以沸石粉部分替代粉煤灰来研究不同替代率下掺沸石粉混凝土的工作性能和力学性能,并在适宜替代率基础上,探究不同水胶比对其力学性能的影响。结果表明:随着沸石粉替代率的上升,混凝土的坍落度逐渐下降;沸石粉替代率≤40%时,会导致混凝土早期力学性能受损,但标准养护28 d后,强度可满足使用要求;当沸石粉替代率达60%时,混凝土的28 d力学性能显著下降;沸石粉替代粉煤灰可提高混凝土的早期韧性,但在标准龄期时,替代率>60%会导致拉压比小幅下降;沸石粉取代粉煤灰混凝土的力学性能随着水胶比的增加不断下降,影响程度随龄期增长逐渐减弱。
In order to explore the feasibility of using zeolite powder to replace fly ash as auxiliary cemenching material to prepare concrete,the working performance and mechanical properties of concrete mixed with zeolite powder were studied by using zeolite powder to partially replace fly ash.On the basis of suitable substitution rate,the effects of different water-cement ratios on its mechanical properties were studied.The results show that with the increase of substitution rate of zeolite powder,the slump of concrete decreases gradually.When the replacement rate of zeolite powder is less than or equal to 40%,the mechanical properties of concrete will be damaged in the early stage,but after 28 days of standard curing,the strength can meet the use requirements.When the substitution rate of zeolite powder reaches 60%,the 28 d mechanical properties of concrete decreases significantly.The substitution of fly ash by zeolite powder can improve the early toughness of concrete,but at the standard age,the substitution rate of more than 60% will lead to a slight decrease in the tensile compression ratio.The mechanical properties of the concrete replaced by fly ash by zeolite powder decreased with the increase of water-cement ratio,and the influence degree gradually weakened with the increase of age.
作者
黄瑶
唐伟桐
甘元初
侯庆振
HUANG Yao;TANG Wei-tong;GAN Yuan-chu;HOU Qing-zhen(College of Civil Engineering,University of South China,Hengyang,Hunan,421001,China)
出处
《建材技术与应用》
2024年第1期13-18,共6页
Research and Application of Building Materials
关键词
沸石粉
粉煤灰
混凝土工作性能
混凝土力学性能
水胶比
zeolite powder
fly ash
workability of concrete
mechanical properties of concrete
water-cement ratio
