利用电石渣制备结构用硅酸盐陶粒的研究

Preparation of load-bearing carbide slag shell-aggregate and research of its properties

硅酸盐壳层陶粒的制备利用电石渣等作为钙质原料,粉煤灰作为硅质原料,在湿基电石渣掺量为37.5%~43.4%,温度为180℃,压力为1MPa的蒸压养护条件下得到了筒压强度高于10 MPa,经过15次冻融循环质量损失小于4%的细石英砂-粉煤灰-电石渣陶粒。所得陶粒堆积密度低于900 kg/m^3,表观密度低于1 800 kg/m^3;筒压强度较市售陶粒提高4~6 MPa,增幅达60%以上。采用标号52.5硅酸盐水泥可以配制出抗压强度80 MPa硅酸盐壳层陶粒混凝土,干表观密度比普通混凝土降低20.9%。硅酸盐壳层陶粒可以配置不同标号的轻混凝土(LWAC),陶粒在混凝土中具有显著强度提升效应,对混凝土强度的贡献优于碎石和烧结陶粒。

Load-bearing carbide slag shell-aggregate is prepared by hydro-thermal synthesis and autoclave curing progress of carbide slag, silica materials(fly ash, tails of quartz sand used to produce glass)and fine aggregate(quartz)under the condition of saturated steam(180 ℃,1MPa).This kind of load-bearing aggergate with bulk density no more than 900 kg/m^3 and apparent density no more than 1 800 kg/m^3 contains 37.5% ~43.4% wet carbide slag.Its cylinder compressive strength is more than 10 MPa,which exceeds the commerical aggregates' by more than 60% and the weight loss is less than 4% after 15 times freezing and thawing cycle.Compressive strength of ceramsite concrete perpared with 525 Portland cement is up to 80 MPa.Compared with normal concrete,the dry density of ceramsite concrete reduces the amount by 20.9%.The ceramsite in this experiment can be used to prepare different grade LWAC and has higher performance in concerte than sinter ceramsite and broken stone in improving concrete compressive strength.