Salt-frost damage model of hybrid fiber reinforced concrete under the coupling action of salt-freeze-thaw cycles
In order to study the salt-freezing resistance of hybrid fiber reinforced concrete,the mechanical properties of five groups of hybrid fiber reinforced concrete after freezing and thawing cycle in sulfate-chloride salt solution were tested,and the compressive strength,splitting-tensile failure forms,strength loss rate and salt-freezing damage of hybrid fiber reinforced concrete after different salt-freezing cycles were compared and analyzed.The test results show that the steel-polypropylene hybrid fiber reinforced concrete has the best salt-frost resistance during 0-200 salt-freezing cycles.In the single fiber concrete,the salt-freezing resistance of 1.2％steel fiber concrete is slightly better than that of 0.8％steel fiber concrete.The Weibull distribution theory is used to establish the salt-freeze damage model of hybrid fiber reinforced concrete.Based on the strength attenuation model of concrete under the condition of freeze-thaw cycle,an improved strength attenuation model of fiber reinforced concrete under the effect of salt-freezing cycles is established.By combining the strength attenuation model and salt-freezing damage model,the evolution equation of salt-freezing damage degree of hybrid fiber concrete is established.The salt-freezing damage degree of hybrid fiber reinforced concrete can be predicted by the number of salt-freezing cycles and relative strength.
fiber reinforced concretesalt-freezing cyclestrength attenuation modelsalt-freezing damage model
NETL
NSTL
万方数据
维普
