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杨俊超^1,2,彭 玲³,陈永强³,汪  晖⁴

(1. 河北建筑工程学院 土木工程学院，河北 张家口，075000；2. 河北省土木工程诊断、改造与抗灾重点实验室，河北 张家口，075000 3. 河北建筑工程学院 河北 张家口075000；4.宁波大学 土木工程与地理环境学院，浙江 宁波，315000)

 

摘 要：将二次铝灰(SAD)与焚烧垃圾飞灰(WFA)混掺制备成活性粉末混凝土(RPC)，研究二次铝灰在两种混合料中的掺量对RPC流变性能参数(扩展度和塑性粘度)、抗折强度、抗压强度以及干燥收缩率的影响,并测定RPC在水中的重金属元素(Cr和Zn)渗出量；观察RPC的微观形貌，从而揭示RPC性能的机理。结果表明：当二次铝灰的掺量为60%时，RPC的扩展度、抗折强度与抗压强度值以及干燥收缩率达到最高，此时RPC的塑性黏度值最小；RPC中Cr与Zn的渗出量与其渗出时间成正相关，与RPC中二次铝灰的掺量成反相关；当二次铝灰掺入60%时，RPC的微观结构最密实。

关键词：二次铝灰；垃圾飞灰；流变参数；强度；重金属渗出

中图分类号：TU5; U414             

文献标志码：A      

文章编号：1005-8249(2024)01-0039-06

DOI：10.19860/j.cnki.issn1005-8249.2024.01.008

YANG Junchao^1,2, PENG Ling³, CHEN Yongqiang³, WANG Hui⁴

(1. Hebei University of Architecture, School of Civil Engineering, Zhangjiakou 075000, China; 2. Key Laboratory of Civil Engineering Diagnosis, Renovation and Disaster Resistance in Hebei Province, Zhangjiakou 075000, China; 3. Hebei University of Architecture,Zhangjiakou 075000, China;4. School of Civil Engineering and Geographical Environment, Ningbo University, Ningbo 315000, China)

Abstract: In this paper, the reactive powder concrete (RPC) is prepared with the assembly unit of secondary aluminum dross (SAD) and incineration waste fly ash (WFA). The influences of the SAD’s mass ratio to the total mass of SAD and WFA on the rheological parameters (the slump flow and the plastic viscosity), the flexural strength and the compressive strength  are investigated. The immersed heavy metals (Cr and Zn) are measured. The RPC’s microscopic morphology obtained by the scanning electron microscope (SEM) is used to reveal the mechanism of RPC’s performances. The researching results display that when the mass ratio of secondary aluminum dross is 60%, the slump flow, the flexural strength, the compressive strength and the drying shrinkage rate of RPC are the highest. However, the plastic viscosity of the RPC is the lowest at this moment. The amounts of the leached Cr and Zn are positively correlated with its immersing time and inversely correlated with the amount of the secondary aluminum dross. When the amount of amount of the secondary aluminum dross is 60%, the microstructure of RPC is the most compact.

keywords: secondary aluminum dross；waste fly ash；rheological parameters；mechanical strength; leached heavy metal 

作者简介：杨俊超(1982-)，男，硕士，讲师，主要研究方向：工程材料、力学方面研究。

通信作者:汪晖(1987-)，男，博士，副教授,主要研究方向：土木工程材料方面研究。

收稿日期：2023-11-26