Mechanical Performance Of Marine Sand And Seawater Concrete And Bending Properties Of FRP Bars-marine Sand And Seawater Concrete Beams

With the rapid development of modern construction industry in china,all kinds of buildings are built on the land of the motherland,concrete has been widely used as the main building material.River sand as the main source of fine aggregate always has been used widely.Now the amount of this non-renewable resources are lack,and in some unconventional environments getting river sand and fresh water is very difficult.So marine sand and seawater are regarded as ideal replacement for river sand and freshwater.Since chloride ions in original marine sand and seawater will corrode rebar in reinforced concrete structures,studying the similarities and differences between FRP bars-marine sand and seawater concrete and reinforced concrete have the great theoretical and practical engineering significance.In this paper,using different water-cement ratios(0.40,0.51,0.63,0.80)and curing periods(3d,7d,14 d,28d,56 d,112d)as the variables,the variation of cube compressive strength of the same mix proportions marine sand and seawater concrete cured in seawater and ordinary concrete cured in freshwater were studied.And the characteristics of the axial compressive strength,compressive failure modes,elastic modulus and compressive stress-strain curve were studied for one group of two kinds of concrete.And the two concrete compression constitutive equations with reference to the constitutive equation of Guo Zhenhai were summarized,The difference between the two concrete compressive mechanical performances were then compared.According to the obtained test results,in this paper ABAQUS is used to simulate the FRP bars-marine sand and seawater concrete beams,reinforced concrete beams,whole FRP bars-ordinary concrete beams and mix bars ordinary concrete beams,and contrast destruction bending load cases of them,by the height of the beam cross-section,the stretch ratio of reinforcement,stirrup reinforcement ratio,the combination of stretch of the four kinds of beam as variables to get the ultimate load and the corresponding displacement,analyze their differences and focus compared with FRP bars-marine sand seawater concrete beams and reinforced concrete beam,analysis transformation laws of curve and get the simulation results obtained with a reference value its load.The results obtained and simulation comparison results in this paper could be more suitable to analyze FRP bars-marine sand seawater concrete,which can enrich and develop the theory.