废弃铸造砂绿色混凝土的性能研究  

Research on the Properties of Green Concrete Made from Spent Foundry Sand

作　　者：杨志勇 张治国 姜瑞双 郭本栋 

机构地区：[1]山东高速畅通路桥工程有限公司,山东潍坊261500 [2]山东省交通科学研究院,山东济南250102 [3]济南城市建设集团有限公司,山东济南250031

出　　处：《混凝土世界》2024年第7期23-27,共5页China Concrete

基　　金：山东省交通运输厅科技计划项目(2019B29)。

摘　　要：在金属铸造过程中会产生大量的废弃铸造砂(Spent Foundry Sand,SFS),如何对其进行妥善处理,是目前工业固废的研究热点。本文选取SFS以5%、10%、15%、20%同等质量替代天然河砂制备绿色混凝土,并测试其抗压强度、劈裂抗拉强度、氯离子渗透性,验证其适用性。结果表明:在力学性能方面,当龄期为28 d时,SFS绿色混凝土的抗压强度和劈裂抗拉强度分别比对照组混凝土最高提高了26%和12.87%。并且28 d龄期下的SFS绿色混凝土,其电通量相较于对照组下降了7.2%~17.7%;此外,SEM/EDS试验表明,SFS仅起到填充孔隙的作用,并不会产生新的水化产物,因此,与对照组混凝土相比,使用SFS替代河砂制备混凝土,不仅能降低混凝土的生产成本,减少对环境的污染,还能提升混凝土的力学性能和耐久性能。A large amount of spent foundry sand(SFS)is generated during the metal casting process.How to properly treat it is currently a research hotspot in industrial solid waste.Therefore,this article selects SFS to replace natural river sand with 5%,10%,15%,and 20%of the same quality to prepare green concrete and verifies the applicability of the green concrete by testing compressive strength,tensile splitting strength,and chloride ion permeability.The results show that when the age is 28 days,the compressive strength and splitting tensile strength of green concrete are the highest,which are 26%and 12.87%higher than the control group concrete,respectively.At the same time,the electric f lux of the green concrete decreases by 7.2%to 17.77%.SEM/EDS experiments show that SFS only plays a role in filling pores and does not produce new hydration products.Therefore,compared with the control group concrete,preparation of concrete by adding SFS can not only reduce production costs and reduce environmental pollution,but also improve the mechanical properties and durability of concrete.

关 键 词：废弃铸造砂 力学性能 耐久性能 孔隙率 填充作用 

分 类 号：TU528[建筑科学—建筑技术科学]