Basic magnesium sulfate cement coral aggregate concrete(MCAC)is a new type of concrete consisting of basic magnesium sulfate cement,coarse coral aggregate,coral reef sand and seawater.The rebound hammer(RH),the ultras...Basic magnesium sulfate cement coral aggregate concrete(MCAC)is a new type of concrete consisting of basic magnesium sulfate cement,coarse coral aggregate,coral reef sand and seawater.The rebound hammer(RH),the ultrasonic pulse velocity(UPV)and the compressive strength(fcu)tests of 14 sets of cube specimens of the MCAC after 28 d of aging were conducted.The impact of the content and length of sisal fiber on the relationship between the fcu-RH and the fcu-UPV was determined.A mathematical model was established to predict the strength of the MCAC using the UPV,RH,and comprehensive UPV/RH methods and to obtain the curves of test strength.The applicability of the test strength curves of ordinary portland concrete(OPC),light-weight aggregate concrete(LAC),and coral aggregate concrete(CAC)to MCAC was assessed.The results showed that the test strength curves of OPC,LAC and CAC were inappropriate to determine the strength of MCAC using non-destructive method.The relative standard error of the curves of test strength of the RH method and the comprehensive method met the specifications,whereas that of the UPV method did not.展开更多
基于Wed of Science(WOS)和中国知网(CNKI)中1990—2023年数据库,采用文献计量学方法对有关酿酒葡萄及葡萄酒产地溯源的相关文献进行可视化分析。结果显示,研究葡萄酒产地溯源领域的国家主要有意大利225篇、西班牙209篇、法国148篇,国际...基于Wed of Science(WOS)和中国知网(CNKI)中1990—2023年数据库,采用文献计量学方法对有关酿酒葡萄及葡萄酒产地溯源的相关文献进行可视化分析。结果显示,研究葡萄酒产地溯源领域的国家主要有意大利225篇、西班牙209篇、法国148篇,国际上French National Research Institute for Agriculture,Food,and the Environment(INRAE)是目前葡萄酒溯源领域内的核心单位。国内机构的发文量均较少,且机构间合作较少。研究热点主要聚焦于“葡萄酒”、“模式识别”、“同位素”、“溯源”等关键词,目前葡萄酒通过矿物元素、品种、电子舌、指纹图谱、同位素、理化指标等更为丰富的指标进行产地鉴别。展开更多
基金Funded by National Natural Science Foundation of China(Nos.51878350,11832013,52078250)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX21_0236)。
文摘Basic magnesium sulfate cement coral aggregate concrete(MCAC)is a new type of concrete consisting of basic magnesium sulfate cement,coarse coral aggregate,coral reef sand and seawater.The rebound hammer(RH),the ultrasonic pulse velocity(UPV)and the compressive strength(fcu)tests of 14 sets of cube specimens of the MCAC after 28 d of aging were conducted.The impact of the content and length of sisal fiber on the relationship between the fcu-RH and the fcu-UPV was determined.A mathematical model was established to predict the strength of the MCAC using the UPV,RH,and comprehensive UPV/RH methods and to obtain the curves of test strength.The applicability of the test strength curves of ordinary portland concrete(OPC),light-weight aggregate concrete(LAC),and coral aggregate concrete(CAC)to MCAC was assessed.The results showed that the test strength curves of OPC,LAC and CAC were inappropriate to determine the strength of MCAC using non-destructive method.The relative standard error of the curves of test strength of the RH method and the comprehensive method met the specifications,whereas that of the UPV method did not.
文摘基于Wed of Science(WOS)和中国知网(CNKI)中1990—2023年数据库,采用文献计量学方法对有关酿酒葡萄及葡萄酒产地溯源的相关文献进行可视化分析。结果显示,研究葡萄酒产地溯源领域的国家主要有意大利225篇、西班牙209篇、法国148篇,国际上French National Research Institute for Agriculture,Food,and the Environment(INRAE)是目前葡萄酒溯源领域内的核心单位。国内机构的发文量均较少,且机构间合作较少。研究热点主要聚焦于“葡萄酒”、“模式识别”、“同位素”、“溯源”等关键词,目前葡萄酒通过矿物元素、品种、电子舌、指纹图谱、同位素、理化指标等更为丰富的指标进行产地鉴别。
