摘要
为推进工程弃土资源化利用并提升氯氧镁水泥(MOC)的综合性能,以工程弃土为掺合料,开展了不同工程弃土掺量(0、20%、40%、60%)、含水率(0、10%、20%、30%)及碳化养护条件下MOC的抗折、抗压强度测试和耐水性试验研究。结果表明,掺入20%工程弃土时,MOC力学强度和耐水性最优(28 d抗压强度提升了2.34%,软化系数提高了3.8%);当掺量提升至40%时,抗压强度仅下降0.88%,但工程弃土利用率显著提高。含水率对力学性能具有显著负面影响,含水率30%时抗压强度较烘干试样下降11.6%,归因于水分子引发的颗粒团聚行为。碳化养护通过生成碳酸镁絮状物填充孔隙,使抗压强度提升11.71%~16.54%。此外,工程弃土与碳化养护的协同作用显著提升耐水性,20%工程弃土掺量试样经碳化后软化系数达0.88(较未碳化组提高11.4%)。本研究成果可为工程弃土增强氯氧镁水泥材料在固体废物资源化利用以及低碳环保领域的应用提供重要的数据支撑。
To promote the resource utilization of engineering waste soil(EWS)and enhance the comprehensive performance of magnesium oxychloride cement(MOC),the effects of EWS incorporation(0,20%,40%,60%),moisture content(0,10%,20%,30%),and carbonation curing on the flexural strength,compressive strength,and water resistance of MOC were investigated.Experimental results demonstrated that the incorporation of 20%EWS achieved optimal mechanical properties and water resistance of MOC,with a 28 d compressive strength increase of 2.34%and the softening coefficient improvement of 3.8%.When the incorporation amount was elevated to 40%,the compressive strength exhibited only a marginal decrease(0.88%),but the utilization rate of engineering waste soil was significantly improved.Moisture content exerted a notable adverse effect on mechanical performance.Specimens with 30%moisture content showed an 11.6%reduction in compressive strength compared to dried samples,attributed to particle agglomeration induced by water molecules.Carbonation curing enhanced compressive strength by 11.71%-16.54%through pore-filling effects via magnesium carbonate flocs.Furthermore,the synergistic interaction between waste soil incorporation and carbonation curing substantially improved water resistance,yielding a softening coefficient of 0.88(11.4%increase compared to uncarbonized group)for 20%waste soil-incorporated specimens after carbonation.The results of this study can provide important data support for the application of magnesium oxychloride cement materials in solid waste resource utilization and low-carbon environmental protection.
作者
张楸雨
吴春然
罗富明
寇世聪
ZHANG Qiuyu;WU Chunran;LUO Fuming;KOU Shicong(School of Civil and Transportation Engineering,Guangzhou University,Guangzhou Guangdong 511400;Yitong Manchu Autonomous County Xiangjian Huinong Co.Ltd.,Siping Jilin 136000)
出处
《环境卫生工程》
2025年第6期81-86,共6页
Environmental Sanitation Engineering
基金
国家自然科学基金专项项目(523418011002143)
广州市建筑集团有限公司科技计划项目([2024]-KJ0001)。
关键词
工程弃土
氯氧镁水泥
耐水性
力学强度
碳化养护
engineering waste soil
magnesium oxychloride cement
water resistance
mechanical strength
carbonation curing
