全球建筑联盟(Global Alliance for Buildings and Construction,简称GABC)是致力于推动全球绿色健康、可持续、低碳排放建筑发展和产业转型的国际组织。GABC发表的报告中显示,世界CO_(2)排放量中建筑行业占38%,水泥产业占8%。在气候变...全球建筑联盟(Global Alliance for Buildings and Construction,简称GABC)是致力于推动全球绿色健康、可持续、低碳排放建筑发展和产业转型的国际组织。GABC发表的报告中显示,世界CO_(2)排放量中建筑行业占38%,水泥产业占8%。在气候变化相关的《巴黎协定》中提到,到2030年水泥产业的CO_(2)排放量要降至6.56%。桥梁行业中有建议采用碳纤维增强复合材料(CFRP)替代钢筋和PC钢束以降低CO_(2)排放量。目前全世界生产的CFRP用于建筑行业的仅占4.2%。CFRP单价比钢筋、PC钢束高,且制造时CO_(2)排放量高,但其材料力学性能和耐腐蚀、耐疲劳性能高,因此CFRP结构通过减少钢筋、PC钢束以及混凝土用量,进而可减少CO_(2)排放量。为确认CFRP结构CO_(2)排放量降低效果,首先研究了CO_(2)排放量的计算方法,然后以德国2座CFRP桥梁为对象,比较钢筋混凝土桥梁和CFRP桥梁的CO_(2)排放量。展开更多
Compressive and flexural strength,fracture energy,as well as fatigue property of pervious cement concrete with either supplementary cementitious materials (SCMs) or polymer intensified,were analyzed.Test results show ...Compressive and flexural strength,fracture energy,as well as fatigue property of pervious cement concrete with either supplementary cementitious materials (SCMs) or polymer intensified,were analyzed.Test results show that the strength development of SCM-modified pervious concrete (SPC) differs from that of polymer-intensified pervious concrete (PPC),and porosity has little effect on their strength growth.PPC has higher flexural strength and remarkably higher flexural-to-compressive strength ratio than SPC at the same porosity level.Results from fracture test of pervious concrete mixes with porosity around 19.5% show that the fracture energy increases with increasing the dosage of polymer,reflecting the ductile damage features rather than brittleness.PPC displays far longer fatigue life than SPC for any given failure probability and at any stress level.It is proved that two-parameter Weibull probability function describes the flexural fatigue of pervious concrete.展开更多
文摘全球建筑联盟(Global Alliance for Buildings and Construction,简称GABC)是致力于推动全球绿色健康、可持续、低碳排放建筑发展和产业转型的国际组织。GABC发表的报告中显示,世界CO_(2)排放量中建筑行业占38%,水泥产业占8%。在气候变化相关的《巴黎协定》中提到,到2030年水泥产业的CO_(2)排放量要降至6.56%。桥梁行业中有建议采用碳纤维增强复合材料(CFRP)替代钢筋和PC钢束以降低CO_(2)排放量。目前全世界生产的CFRP用于建筑行业的仅占4.2%。CFRP单价比钢筋、PC钢束高,且制造时CO_(2)排放量高,但其材料力学性能和耐腐蚀、耐疲劳性能高,因此CFRP结构通过减少钢筋、PC钢束以及混凝土用量,进而可减少CO_(2)排放量。为确认CFRP结构CO_(2)排放量降低效果,首先研究了CO_(2)排放量的计算方法,然后以德国2座CFRP桥梁为对象,比较钢筋混凝土桥梁和CFRP桥梁的CO_(2)排放量。
基金Project(kfj080205)supported by Key Laboratory of Road Structure and Material of Ministry of Transport(Changsha),China
文摘Compressive and flexural strength,fracture energy,as well as fatigue property of pervious cement concrete with either supplementary cementitious materials (SCMs) or polymer intensified,were analyzed.Test results show that the strength development of SCM-modified pervious concrete (SPC) differs from that of polymer-intensified pervious concrete (PPC),and porosity has little effect on their strength growth.PPC has higher flexural strength and remarkably higher flexural-to-compressive strength ratio than SPC at the same porosity level.Results from fracture test of pervious concrete mixes with porosity around 19.5% show that the fracture energy increases with increasing the dosage of polymer,reflecting the ductile damage features rather than brittleness.PPC displays far longer fatigue life than SPC for any given failure probability and at any stress level.It is proved that two-parameter Weibull probability function describes the flexural fatigue of pervious concrete.
