Preparation of High Activity Admixture from Steel Slag,Phosphate Slag and Limestone Powder  

作　　者：Ying Ji Xi Liu 

机构地区：[1]College of Materials Science and Engineering,Xi’an University of Architecture&Technology,Xi’an,710055,China

出　　处：《Journal of Renewable Materials》2023年第11期3977-3989,共13页可再生材料杂志(英文)

基　　金：Key Research and Development Plan of Shaanxi Province(2019TSLGY05-04).

摘　　要：The problem of low disposal and utilization rate of bulk industrial solid waste needs to be solved.In this paper,a high-activity admixture composed of steel slag-phosphate slag-limestone powder was proposed for most of the solid waste with low activity and a negative impact on concrete workability,combining the characteristics of each solid waste.The paper demonstrates the feasibility and explains the principle of the composite system in terms of water requirement of standard consistency,setting time,workability,and mechanical properties,combined with the composition of the phases,hydration temperature,and microscopic morphology.The results showed that the steel slag:phosphate slag:limestone=5:2:3 gave the highest activity of the composite system,over 92%.Besides,the composite system had no significant effect on water demand and setting time compared to cement,and it could significantly increase the 7 and 28 d activity of the system.The composite system delayed the exothermic hydration of the cement and reduced the exothermic heat but had no effect on the hydration products.Therefore,the research in this paper dramatically improved the solid waste dissipation in concrete,reduced the amount of cement in concrete and positively responded to the national slogan of carbon neutral and peaking.

关 键 词：Steel slag phosphorus slag limestone powder high activity admixture solid waste 

分 类 号：TG142[一般工业技术—材料科学与工程]