Brine-freeze-thaw Durability and Crack Density Model of Concrete in Salt Lake Region
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第3期
论文作者：巩位 余红发 MA Haiyan HAN Wenliang
文章页码：561 - 570
摘 要：The brine-freeze-thaw durability （defined as the durability under freeze-thaw cycles in Qinghai salt lake brine） of concrete （ordinary Portland cement concrete （OPC）,high performance concrete （HPC-a）,high performance concrete with steel fiber （HPC-b）,and high performance concrete with high Young’s modulus polyethylene fiber （HPC-c）） was systematically investigated by the relative dynamic elastic modulus,the relative mass,the appearance,the scanning electron microscopy,and the X-ray diffraction.In addition,the low-temperature physical and chemical corrosion mechanism and a crack density model after the modified relative dynamic elastic modulus being taken into consideration were proposed.The results show that the deterioration of OPC is the severest,followed by HPC-a,HPC-c and HPC-b.The admixture or the fiber is mixed into concrete,which can improve the brine-freeze-thaw durability of concrete.The critical mass growth of the failure of concrete is 3.7%.The cause of the deterioration of concrete under the brine-freeze-thaw cycles is physical and chemical corrosion,not freezing and thawing.The crack density model can effectively describe the deterioration evolution of concrete.
巩位，余红发，MA Haiyan，HAN Wenliang
Department of Civil Aviation, Nanjing University of Aeronautics and Astronautics
摘 要：The brine-freeze-thaw durability （defined as the durability under freeze-thaw cycles in Qinghai salt lake brine） of concrete （ordinary Portland cement concrete （OPC）,high performance concrete （HPC-a）,high performance concrete with steel fiber （HPC-b）,and high performance concrete with high Young’s modulus polyethylene fiber （HPC-c）） was systematically investigated by the relative dynamic elastic modulus,the relative mass,the appearance,the scanning electron microscopy,and the X-ray diffraction.In addition,the low-temperature physical and chemical corrosion mechanism and a crack density model after the modified relative dynamic elastic modulus being taken into consideration were proposed.The results show that the deterioration of OPC is the severest,followed by HPC-a,HPC-c and HPC-b.The admixture or the fiber is mixed into concrete,which can improve the brine-freeze-thaw durability of concrete.The critical mass growth of the failure of concrete is 3.7%.The cause of the deterioration of concrete under the brine-freeze-thaw cycles is physical and chemical corrosion,not freezing and thawing.The crack density model can effectively describe the deterioration evolution of concrete.
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