热处理强化铝灰-磷石膏-钢渣粉稳定钢渣-碎石互配骨料力学性能

Mechanical Performance Improvement by Stabilizing Hot-braised Steel Slag-Gravel Mixed Aggregates

高速发展的规模型路基建设可消纳大宗工业固废,为此,试验利用大宗工业固废磷石膏(PG)、热闷钢渣(HBSS)、铝灰(AD)、硅酸盐水泥(PC)、天然碎石(NA)开发制备了复合水稳层材料。将PG和AD进行热处理改性,同时除去环境危害。再用改性后的PG-HBSS-AD-PC复合胶凝灰浆经过优化的HBSS-NA互配骨料。结果表明,用细粒HBSS部分代替碎石,可通过增加试件密实度优化水稳层的骨料架构。160℃处理后的PG与900℃处理后的AD加入PC后,通过CaSO_(4)·0.5H_(2)O硬化、水化铝酸钙(C-A-H)及钙矾石(AFt)的生成能进一步增强水稳层力学性能,固废利用率高。

Highly developed scale roadbed construction can consume bulk industrial solid waste.In this study,composite hydraulic stabilized layer materials were prepared by using bulk industrial solid waste such as phosphogypsum(PG),hot-braised steel slag(HBSS),aluminium dross(AD),portland cement(PC),and natural aggregates(NA).The PG and AD were modified by heat treatment with environmental hazards removed.The modified PG-HBSS-AD-PC composite cement was then used to stablize the optimised HBSS-NA intermixed aggregates.The results show that replacing NA with fine-grained HBSS can optimise the aggregate architecture of the hydraulic stabilisation layer by increasing the density.The incorporation of 160℃-treated PG and 900℃-treated AD into PC further enhanced the strength of the hydraulic stabilisation layer through the hardening CaSO_(4)·0.5H_(2)O,generation of hydrated calcium aluminate(C-A-H),and ettringite(AFt),with a high solid waste utilisation rate.