焚烧垃圾渣生态型超高性能混凝土研究

制备一种低成本、环保型焚烧垃圾渣超高性能混凝土(UHPC)。根据修正后的Andreasen and Andersen模型进行配合比设计,将处理后焚烧垃圾渣替代河砂,制备不同替换率超高性能混凝土,并对其进行工作性能、力学性能、孔隙特征、水化过程、微观特征以及毒性固结性能测试。结果表明,随着垃圾渣的加入,UHPC的工作性能和抗压强度有所下降,但流动性不低于240 mm,抗压强度不低于117 MPa,累计孔隙含量增加,孔隙大部分分布在＜20 nm无害孔范围内,混凝土界面过渡区裂缝增多,混凝土中锌(Zn)、铅(Pb)和铬(Cr)重金属的离子浸出浓度均低于国标限值,有效地实现了对重金属元素的固结。

Study on Ecological Ultra-High Performance Concrete with Waste Incineration Slag

A kind of low cost and environmental protection ultra-high performance concrete(UHPC)was prepared.According to the modified Andreasen and Andersen model,the mix proportion design was carried out.Using waste incineration slag instead of the river sand to prepare different replacement rates of UHPC,and the working performance,mechanical properties,pore characteristics,hydration process,microscopic characteristics and toxic consolidation performance were tested.The results show that with the addition of garbage residue,the working performance and compressive strength of UHPC decrease,but the fluidity is no less than 240 mm and the compressive strength is no less than 117 MPa.The cumulative pore content increases,most of the pores are distributed in the harmless pore range of<20 nm,and the cracks in the transition zone of concrete interface increase.The concentration of Zn,Pb and Cr in concrete are all lower than the limit value of national standard,which achieves effective consolidation of heavy metals.