为提高再生细骨料(regenerate fine aggregates,RFA)的回收使用率,本研究采用一种含砖RFA进行全再生细骨料混凝土(fully recycled fine aggregate concrete,FRFAC)的试验制备.设计吸水率试验拟合公式计算RFA的主要组成及含量;通过设计...为提高再生细骨料(regenerate fine aggregates,RFA)的回收使用率,本研究采用一种含砖RFA进行全再生细骨料混凝土(fully recycled fine aggregate concrete,FRFAC)的试验制备.设计吸水率试验拟合公式计算RFA的主要组成及含量;通过设计正交试验研究水料比、减水剂和RFA粒径级配对不同养护天数下FRFAC的强度与热工性能的影响.研究结果表明,该RFA中主要包含废砖、废混凝土和泥块,其含量分别为13.58%、52.98%和33.44%,泥块含量较多,所以在制备前需对RFA进行筛分处理,该RFA平均吸水率较大,所以需采用饱和面干法进行预处理;对FRFAC强度影响最大的是RFA粒径级配,其次是水料比和减水剂,强度随着养护天数呈缓慢上升趋势;FRFAC的导热系数低,通过抗压导热交互分析得到配比最优方案为A3B3C2,制备的FRFAC强度达到25.8 MPa,导热系数为0.4636 W/(m·K),可用于建筑工程中.展开更多
The organic matter(OM)enrichment mechanisms and depositional environment characteristics of lacustrine source rocks in the western Bozhong Sag,Bohai Bay Basin in Northeast China remain controversial.To address these i...The organic matter(OM)enrichment mechanisms and depositional environment characteristics of lacustrine source rocks in the western Bozhong Sag,Bohai Bay Basin in Northeast China remain controversial.To address these issues,based on Rock-Eval pyrolysis,kerogen macerals,H/C and O/C ratios,GC-MS,major and trace elements,the Dongying Formation Member(Mbr)3(E_(3)d_(3)),the Shahejie Formation mbrs 1 and 2(E_(2)s_(1+2)),and the Shahejie Mbr 3(E_(2)s_(3))source rocks in the western Bozhong Sag were studied.The above methods were used to reveal their geochemical properties,OM origins and depositional environments,all of which indicate that E_(2)s_(1+2)and E_(2)s_(3)are excellent source rocks,and that E_(3)d_(3)is of the second good quality.E_(3)d_(3)source rocks were formed under a warm and humid climate,mainly belong to fluvial/delta facies,the E_(3)d_(3)sediments formed under weakly oxidizing and freshwater conditions.Comparatively,the depositional environments of E_(2)s_(1+2)source rocks were arid and cold climate,representing saline or freshwater lacustrine facies,and the sediments of E_(2)s_(1+2)belong to anoxic or suboxic settings with large evaporation and salinity.During the period of E_(2)s_(3),the climate became warm and humid,indicating the freshwater lacustrine facies,and E_(2)s_(3)was characterized by freshwater and abundant algae.Moreover,compared with other intervals,the OM origin of E_(3)d_(3)source rocks has noticeable terrestrial input.The OM origin of the E_(2)s_(1+2)and E_(2)s_(3)are mainly plankton and bacteria.Tectonic subsidence and climate change have affected the changes of the depositional environment in the western Bozhong Sag,thus controlling the distribution of the source rocks,the geochemical characteristics in the three intervals of lacustrine source rocks have distinct differences.Overall,these factors are effective to evaluate the paleoenvironmental characteristics of source rocks by biomarkers,major and trace elements.The established models may have positive implications for research of lacustrine source rocks in offshore areas with few drillings.展开更多
文摘为提高再生细骨料(regenerate fine aggregates,RFA)的回收使用率,本研究采用一种含砖RFA进行全再生细骨料混凝土(fully recycled fine aggregate concrete,FRFAC)的试验制备.设计吸水率试验拟合公式计算RFA的主要组成及含量;通过设计正交试验研究水料比、减水剂和RFA粒径级配对不同养护天数下FRFAC的强度与热工性能的影响.研究结果表明,该RFA中主要包含废砖、废混凝土和泥块,其含量分别为13.58%、52.98%和33.44%,泥块含量较多,所以在制备前需对RFA进行筛分处理,该RFA平均吸水率较大,所以需采用饱和面干法进行预处理;对FRFAC强度影响最大的是RFA粒径级配,其次是水料比和减水剂,强度随着养护天数呈缓慢上升趋势;FRFAC的导热系数低,通过抗压导热交互分析得到配比最优方案为A3B3C2,制备的FRFAC强度达到25.8 MPa,导热系数为0.4636 W/(m·K),可用于建筑工程中.
基金funded by the“Key Scientific Issues and Innovative Technology Research on Oil and Gas Resource Exploration in China Sea Risk Exploration Area”(Grant No.CCL2022RCPS2017XNN)from CNOOC Research Institute,Beijing.
文摘The organic matter(OM)enrichment mechanisms and depositional environment characteristics of lacustrine source rocks in the western Bozhong Sag,Bohai Bay Basin in Northeast China remain controversial.To address these issues,based on Rock-Eval pyrolysis,kerogen macerals,H/C and O/C ratios,GC-MS,major and trace elements,the Dongying Formation Member(Mbr)3(E_(3)d_(3)),the Shahejie Formation mbrs 1 and 2(E_(2)s_(1+2)),and the Shahejie Mbr 3(E_(2)s_(3))source rocks in the western Bozhong Sag were studied.The above methods were used to reveal their geochemical properties,OM origins and depositional environments,all of which indicate that E_(2)s_(1+2)and E_(2)s_(3)are excellent source rocks,and that E_(3)d_(3)is of the second good quality.E_(3)d_(3)source rocks were formed under a warm and humid climate,mainly belong to fluvial/delta facies,the E_(3)d_(3)sediments formed under weakly oxidizing and freshwater conditions.Comparatively,the depositional environments of E_(2)s_(1+2)source rocks were arid and cold climate,representing saline or freshwater lacustrine facies,and the sediments of E_(2)s_(1+2)belong to anoxic or suboxic settings with large evaporation and salinity.During the period of E_(2)s_(3),the climate became warm and humid,indicating the freshwater lacustrine facies,and E_(2)s_(3)was characterized by freshwater and abundant algae.Moreover,compared with other intervals,the OM origin of E_(3)d_(3)source rocks has noticeable terrestrial input.The OM origin of the E_(2)s_(1+2)and E_(2)s_(3)are mainly plankton and bacteria.Tectonic subsidence and climate change have affected the changes of the depositional environment in the western Bozhong Sag,thus controlling the distribution of the source rocks,the geochemical characteristics in the three intervals of lacustrine source rocks have distinct differences.Overall,these factors are effective to evaluate the paleoenvironmental characteristics of source rocks by biomarkers,major and trace elements.The established models may have positive implications for research of lacustrine source rocks in offshore areas with few drillings.
