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楊俊超^1,2,彭 玲³,陳永強³,汪  暉⁴

(1. 河北建筑工程學(xué)院 土木工程學(xué)院，河北 張家口，075000；2. 河北省土木工程診斷、改造與抗災(zāi)重點實驗室，河北 張家口，075000 3. 河北建筑工程學(xué)院 河北 張家口075000；4.寧波大學(xué) 土木工程與地理環(huán)境學(xué)院，浙江 寧波，315000)

 

摘 要：將二次鋁灰(SAD)與焚燒垃圾飛灰(WFA)混摻制備成活性粉末混凝土(RPC)，研究二次鋁灰在兩種混合料中的摻量對RPC流變性能參數(shù)(擴展度和塑性粘度)、抗折強度、抗壓強度以及干燥收縮率的影響,并測定RPC在水中的重金屬元素(Cr和Zn)滲出量；觀察RPC的微觀形貌，從而揭示RPC性能的機理。結(jié)果表明：當(dāng)二次鋁灰的摻量為60%時，RPC的擴展度、抗折強度與抗壓強度值以及干燥收縮率達到最高，此時RPC的塑性黏度值最小；RPC中Cr與Zn的滲出量與其滲出時間成正相關(guān)，與RPC中二次鋁灰的摻量成反相關(guān)；當(dāng)二次鋁灰摻入60%時，RPC的微觀結(jié)構(gòu)最密實。

關(guān)鍵詞：二次鋁灰；垃圾飛灰；流變參數(shù)；強度；重金屬滲出

中圖分類號：TU5; U414             

文獻標(biāo)志碼：A      

文章編號：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 

作者簡介：楊俊超(1982-)，男，碩士，講師，主要研究方向：工程材料、力學(xué)方面研究。

通信作者:汪暉(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