Strength Characteristics of Foam Concrete Under Uniaxial Compression
LIU Xiaojiang;HUA Quan;SHAO Chengjian;XU Yongfu;Yancheng Administering Bureau of Highway;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University;
Foam concrete with different content of foam was prepared with cement,fly ash and blast furnace slag as binding materials and according to the mass ratio 16∶ 3∶ 1,water-binder ratio 0. 43. Through laboratory tests the uniaxial compression tests for foam concrete under different rate of foam( 0% ~ 74. 23%) at different curing age( 7d,14 d,28 d) were conducted to study compression strength and failure mode,the stress-strain curve of foam concrete and the relationships between compressive strength and curing age,rate of foam were analyzed. The research results indicate that there are four stages in foam concrete to uniaxial compression process,namely densification stage,elastic stage,yield stage and failure stage; the higher content of foam,the lower the compressive in a certain range increases with curing age. The relationships between compressive strength and the rate of foam were studied by fitting and show an exponential relationship between each other. Also the fitting curve has a good consistency with test data. For samples with high content of foam,the failure pattern shows low strength and brittle failure characteristics,and forming a wide crack in the middle of sample,while the sample with low content of foam,the failure pattern of foam concrete is similar to ordinary concrete.