Research On The Fatigue Performance Of Glass Powder Concrete

Due to the pozzolanic feature of ground glass powder,applying waste glass powder to building materials can not only reduce the use of cement,but also effectively improve the mechanical properties and durability of concrete.In recent years,scholars at home and abroad have conducted a series of studies on glass powder concrete,but the research on the fatigue performance of glass powder concrete is still in its infancy at this stage.Therefore,this article conducts experimental research and theoretical analysis on the effects of glass powder content and maximum stress level on the fatigue performance of concrete.The main research contents include:1.A total of 60 prismatic concrete specimens were designed to study the effects of four glass powder contents(0%,10%,20%,30%)and four maximum stress levels(0.70,0.75,0.80,0.85)on the uniaxial compressive fatigue performance of concrete.Under fatigue loading,the failure forms,fatigue life,and fatigue strain of concrete with different glass powder content were compared and analyzed.The fatigue equation(S-N equation)was established by fitting the maximum stress level(Smax)with the logarithm of fatigue life(log10Nf),and the fatigue strength of concrete with different glass powder content was obtained.2.Based on probability theory and reliability analysis method,the fatigue life of glass powder concrete under different guarantee probabilities(70%,80%)was studied.By fitting the maximum stress level(Smax)and the logarithm of fatigue life(log10Nf),the fatigue equation(S-N-P equation)considering the guarantee probability could be obtained,and the corresponding fatigue strength could be calculated.The experiment showed that the fatigue strength of glass powder concrete lied in the range of 0.408 f’cp-0.662f’cp with a 70%guarantee probability,and the fatigue strength lied in the range of 0.268f’cp-0.660f’cp with an 80%guarantee probability.3.Based on the degradation of fatigue deformation modulus,the damage variable was defined,and the fatigue damage evolution law of glass powder concrete under cyclic loading was studied.The fatigue damage evolution models of concrete with different glass powder contents were fitted.By comparing the theoretical and measured values of peak fatigue strain,the applicability and reliability of the fatigue damage evolution model were explored.