电石渣激发钢渣-矿渣固化淤泥质土的试验研究

钢渣和矿渣是常见的两种工业废渣,大量堆放且资源化利用困难。以钢渣粉和矿渣粉为基础材料,电石渣粉作为激发剂,可对淤泥质土进行固化处理。通过开展无侧限抗压强度试验,分析固化淤泥质土的强度特性和应力-应变关系,利用X射线衍射(XRD)和扫描电镜(SEM)等微观测试,探索电石渣激发钢渣-矿渣固化淤泥质土的作用机理。结果表明,电石渣粉质量掺量为6%时,电石渣-钢渣-矿渣固化淤泥质土无侧限抗压强度最大,28 d固化淤泥质土强度与同龄期水泥土相当,且具有较好的延性。电石渣可以提供碱性环境和大量钙离子,有效激发钢渣和矿渣的水化活性,促进C-S-H凝胶的大量生成,同时促进离子交换和团粒化作用,使固化淤泥质土强度显著提高。

Solidification of Muddy Soil with Steel Slag and Ground Granulated Blast-Furnace Slag Activated by Calcium Carbide Slag

Steel slag and ground granulated blast-furnace slag are two common industrial waste slags, which are piled up in large quantities and are difficult to use as resources. Using steel slag powder and blast-furnace slag powder as basic materials, and calcium carbide slag powder as activator, the muddy soil was solidified. The strength characteristics and stress-strain relationship of solidified muddy soil by carrying out unconfined compressive strength tests were analyzed. X-ray diffraction(XRD) and scanning electron microscopy(SEM) microscopic tests were used to explore the mechanism of calcium carbide slag activated steel slag and ground granulated blast-furnace slag solidified muddy soil. The results show that when the content of calcium carbide slag powder is 6%, the unconfined compressive strength of calcium carbide slag-steel slag-blast furnace slag solidified muddy soil is the highest. The 28 d solidified muddy soil has the same strength as cement solidified muddy soil of the same age and has good ductility. Calcium carbide slag provide an alkaline environment and a large amount of calcium ions, effectively stimulate the hydration activity of steel slag and blast furnace slag, promote the mass production of C-S-H gel, and promote ion exchange and agglomeration, so that the strength of solidified muddy soil is significantly improved.