泡沫混凝土在冻土区油气管道工程中的应用研究OA

This paper focuses on the applicability of foamed concrete in permafrost environments,systematically investigating its mix proportion design,physical-mechanical properties,and freeze-thaw resistance.Using laboratory experimental analysis,foamed concrete specimens with different dry densities(500～700 kg/m3)and water-cement ratios(0.5～0.6)were prepared.Their 28-day compressive strength,thermal conductivity,and strength loss after 25 freeze-thaw cycles were tested.The results indicate that the compressive strength of foamed concrete increases with higher dry density and decreases with a larger water-cement ra-tio.The thermal conductivity shows an upward trend with increases in both dry density and water-cement ratio,with a minimum value of 0.080 W/(m·K)in a dry state,which is significantly superior to that of ordinary concrete.Under freeze-thaw cycling,specimens with lower dry density and higher water-cement ratio exhibit more pronounced strength degradation.Comprehensive performance analysis demonstrates that foamed concrete with a water-cement ratio of 0.55 and a dry density of 500 kg/m3 pos-sesses favorable thermal insulation,mechanical stability,and freeze-thaw resistance,meeting the technical requirements for ther-mal insulation and durability in pipeline engineering within permafrost regions.The research findings can provide theoretical basis and technical support for infrastructure construction in cold regions.