Experimental Study Of Polymer Emulsion Modified Lightweight Aggregate Concrete Short Columns Under Eccentric Compression

Lightweight aggregate concrete has a obvious brittle characteristic.Under the action of load,The internal cracks develop rapidly and penetrate the lightweight aggregate,it is easy to form penetration channels in the corrosion environment,resulting in the corrosion resistance of ordinary Lightweight aggregate Concrete Column(LCC)is relatively poor.In order to improve the brittleness and corrosion resistance of LCC and ensure the high bearing capacity of concrete,this paper proposes the Polymer Emulsion Modified Lightweight Aggregate Concrete Column(HPLC)by soaking and toughening with polymer emulsion.Polymer emulsion soaking and toughening is to completely soak the light aggregate in the polymer emulsion,remove and drain after 1h,and finally mix with the fine aggregate,cementitious material to form concrete,In the hydration process of concrete,polymer emulsion film is wrapped on the surface of the light aggregate to improve the brittleness and durability of the Lightweight aggregate Concrete Column.In order to explore the eccentric compression performance of HPLCC in the remote island reef environment,this paper has done the following research:(1)Through the basic mechanical properties test of High Performance Lightweight Concrete,The results show that the cube compressive strength of High Performance Lightweight Concrete is decreased by 4.51%,0.24% and 1.88% compared to ordinary Lightweight Concrete in the normal environment,seawater wet and dry cycle environment and seawater immersion environment.(2)Through the eccentric compression test of HPLCC under normal environment,we can get the ultimate bearing capacity of HPLCC,failure characteristics,the change rule of load-lateral displacement of the specimen,the relationship of load-lateral displacement in the section of the 0.5 column height from column end,the relationship between the load and the concrete strain,the variation of the force along the load at different positions,the variation of the lateral displacement along the column height and the process of the crack of the test column,comprehensive analysis of its eccentric compression performance.(3)Through the eccentric compression test of HPLCC under seawater wet and dry cycle environment and seawater immersion environment,we can obtain the eccentric compression performance of High Performance Concrete columns under seawater wet and dry cycle environment and seawater immersion environment compare with the eccentric compression performance of ordinary Lightweight aggregate Concrete Columns in the above environment,it shows that the ultimate bearing capacity of ordinary Lightweight Concrete large eccentric compression columns is reduced by 10.99% and 8.90% under seawater wet and dry cycle environment and seawater immersion environment compared with the normal environment;the ultimate bearing capacity of small eccentric compression columns decreased by 8.17% and 4.16% respectively.The ultimate bearing capacity of High Performance Lightweight Concrete with large eccentric compression column is reduced by 5.14% and 3.42% respectively.The ultimate bearing capacity of small eccentric compression column is reduced by 3.44% and 1.64% respectively.In the seawater wet and dry cycle environment and seawater immersion environment,HPLCC can better maintain the ultimate bearing capacity.(4)Using ABAQUS simulation the eccentric compression test of HPLCC under different environmental performance,and compared with the test results analysis,ABAQUS model is proved correct and reasonable parameter settings.On this basis,using ABAQUS obtain the ultimate bearing capacity of HPLCC under different reinforcement ratio and eccentricity.And to fit the formula of the ultimate bearing capacity of HPLCC under different environment.