玄武岩纤维风积沙混凝土单轴受压应力-应变试验研究OA

In order to study the mechanical properties of aeolian sand concrete(ASC)under axial compression with different basalt fiber(BF)contents,the experiment took concrete with 0%fiber content as the reference group and designed the basalt fiber-aeolian sand concrete(BF-ASC)with different fiber content of 0.05%,0.10%,0.15%,and 0.20%.The influence of the BF volume fraction on the axial compressive strength,the peak stress,the peak strain,and the elastic modulus of ASC was analyzed.The results show that the peak stress and elastic modulus of the concrete first increase and then decrease with the fiber volume fraction.At 0.10%BF,the peak stress and elastic modulus of the concrete are 115.6%and 112%of the reference group,respectively.The peak strain and toughness indices increase with the volume fraction of the fiber.At 0.20%BF,the peak strain and toughness indices increase by 34.92%and 7.2%compared to the reference group.The entire stress-strain curve of BF-ASC undergoes three stages of elastic,elastoplastic,and failure,just like ordinary ASC.The BF-ASC constitutive relation can be described in terms of segments based on the Carreira and Chu model and the Guo Zhenhai's model.The ascending profile is consistent with the Carreira and Chu models,and the descending profile is consistent with the Guo model.In addition,a regression analysis is conducted on the BF-ASC uniaxial compressive constitutive model considering the BF content.The correlation coefficients are all greater than 0.98,and the model has a high degree of agreement with the experimental curves.