Research On Permeability Of Concrete Under Tensile Load

In practical engineering, the concrete structure is mostly working under the loadcondition, and various load of the transmission performance of the concrete is differentfrom that detected in the experimental conditions. For the study of impermeability ofpractical engineering concrete under tensile loading and influencing factors, this articlestudies from the electric flux, the gas permeability coefficient of the surface, theultrasonic nondestructive testing and other aspects to learn the variation of thepenetration resistance of different mix of concrete in tensile loading.The topic study the concrete in the actual work of concrete in tensile loadpermeability, and measured by self-designed test methods to learn the permeability ofconcrete under tensile state, and the rule of variation of the impermeability of concreteunder tensile load with different water-cement ratio, the dosage of mineral admixtures,concrete containing gas, fiber content and other factors.The study results show that: a low water-cement ratio of concrete in tensile loadshas slow destruction of concrete deterioration, concrete permeability increased moreslowly; while after the incorporation of mineral admixtures, fly ash and slag power usedin this experiment has similar effect, in the incorporation of mineral admixtures, due toconcrete density increasing, the internal structural improves, and it is more difficult todestroy concrete, and the permeability increased less; while the incorporation ofair-entraining agent, when with no loads, the permeability increased, but the differenceis small, and in tensile loads, the impermeability of concrete with gas content less than5%decreased less than that of basic concrete, and when the gas content is5%the effectis the best, but when the gas content is over5%, the effect becomes poor. When dropedfiber concrete,it can effectively prevent the impermeability of concrete becoming badin tensile loads with right amount of fiber,but when it drop excessive fibers, the effectwill be bad,and even promote impermeability of concrete deterioration.