关键词:

工程弃土')">"> 工程弃土, 氯氧镁水泥, 耐水性, 力学强度, 碳化养护

Abstract:

To promote the resource utilization of engineering waste soil (EWS) and enhance the comprehensive performance of MOC, this study investigated the effects of EWS incorporation (0% ~ 60%), moisture content (0% ~ 30%), and carbonation curing on the flexural strength, compressive strength, and water resistance of MOC. Experimental results demonstrated that the incorporation of 20% EWS achieved optimal mechanical properties and water resistance, with a 28d compressive strength increase of 2.34% and the softening coefficient improvement of 3.8%. When the incorporation ratio was elevated to 40%, the compressive strength exhibited only a marginal decrease (0.88%). Moisture content exerted a notable adverse effect on mechanical performance: specimens with 30% moisture content showed an 18.6% reduction in compressive strength compared to dried samples, attributed to particle agglomeration induced by water molecules. Carbonation curing enhanced compressive strength by 11.7% ~ 16.5% 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 (11.3% increase) for 20% waste soil-incorporated specimens after carbonation. The results of this study can provide important data support for the reinforcement of magnesium oxychloride cement materials in solid waste resource utilization.

Key words:

Engineering ')">"> Engineering , waste , soil, magnesium oxychloride cement, water resistance, Mechanical strength, Carbonation curing