低碳固化剂稳定弃土(浆)制备自密实回填材料的性能与碳排放研究OA

With the continuous expansion of urban water supply and drainage pipeline construction projects,the disposal of engineering waste soil(slurry)and construction debris has become increasingly prominent.Meanwhile,the traditional backfill materials for pipeline docks(such as medium-coarse sand and foam concrete)exhibit numerous drawbacks,including high resource consumption,significant carbon emissions,and low construction efficiency.This paper,based on the backfilling project at Jiangchuan Road stockpile test site in Shanghai Minhang District,aims to develop a novel backfill material that combines excellent engineering performance with low-carbon and environmental protection characteristics.Through orthogonal experimental methods,the optimal proportion of low-carbon curing agents using cement,fly ash,steel slag powder,and slag powder was systematically optimized,resulting in a controllable low-strength self-compacting fill material(CLSM).Experimental results demonstrate that the prepared CLSM exhibits a 28-day unconfined compressive strength of≥1.0 MPa,flowability of≥180 mm,softening coefficient of≥85%,dry shrinkage strain within the range of 2×10-4 to 3.5×10-4,and a dry shrinkage coefficient below 150×10-4,meeting the requirements for self-leveling and self-compacting construction.Additionally,carbon emission calculations based on life cycle assessment(LCA)theory show that the carbon emission per unit volume of CLSM is only 21.256 kgCO2/m3,representing a 74.1%and 86.7%reduction in carbon emissions compared to the traditional medium-coarse sand and foam concrete,respectively.This paper provides a feasible technical pathway and data support for achieving resource utilization of engineering waste soil(slurry)and the green,low-carbon transformation of municipal engineering projects.