碱性高炉矿渣制备多孔混凝土掺合料及其净化酸性水的试验研究

碱性高炉矿渣和多孔混凝土都有良好的净水性能,将碱性高炉矿渣作为掺合料制成掺高炉矿渣多孔混凝土(BSPC),对其处理模拟酸性水的效果进行研究。结果表明:经BSPC处理后,进水p H由2~3变成8.5~9.1。与普通多孔混凝土相比,添加高炉矿渣的混凝土对酸性水浊度、CODcr、TP和Cd的平均去除率依次提高了6.2%,8.8%,5.2%和4.5%,分别达到74.3%,74.5%,91.7%和86.5%。同时,BSPC孔隙率在处理酸性水前后有所下降,下降幅度较小,为6.2%,不影响BSPC对酸性水的处理。实验最后对混凝土表面白色絮状物进行了红外和XRD表征,初步分析其中含有CaCO_3、SiO_2和水化硅酸钙(C-S-H)等无机物,初步判定来源于BSPC的溶出物。

Alkaline Blast-Furnace Slag Used as Admixture for Porous Concrete for Purification Experimental of Acidic Water

Alkaline blast-furnace slag and porous concrete have good performance in water purification, and we used alkaline blast-furnace slag as admixture for porous concrete to make blast furnace slag porous concrete(BSPC).In addition, we studied the effect of BSPC treating simulated acid water. Results show that the pH of simulated acid water changes from 2~3 to 8.5~9.1 by BSPC. Compared with normal porous concrete, the porous concrete added blast furnace slag increase the average removal rates of turbidity, CODcr, TP and Cd by 6.2%,8.8%, 5.2% and 4.5%, respectively for the porous concrete added blast furnace slag, and are 74.3%,74.5%,91.7% and 86.5%, respectively. Morover, the porosity of BSPC decreases with treatment of acidic water, however, the degree of declining is 6.2% which is not high, and does not affect BSPC treating acidic water. In the end, we used infrared spectroscopy and X-ray diffraction to detect the white floc on the surface of BSPC, analyzed the white floc that may contain CaCO₃, SiO₂ and hydrated calcium silicate(C-S-H) which derived from the BSPC dissolution by preliminary determination.