RESEARCH ON MECHANICAL PROPERTIES OF RECYCLED AGGREGATE FILL WALL MATERIAL AND ITS STRENGTH DAGRADATION IN DISASTER ENVIRONMENTS

In order to study the filled with wall material mechanical properties of recycled aggregate and strength degradation rule in disaster ( flood，fire) environment，five-factor and four-level orthogonal test methods were used to do mix combination design of filling wall materials with recycled aggregate． The mechanical tests of 144 specimens in three environments ( dried at room temperature，flooding，fire) were completed，based on the test data，the actions of influence factors of filling wall materials of recycled aggregate and the difference among the levels of relations in-depth analysis． The results showed that water-cement ratio had the most obvious effect on the mechanical properties of recycled materials under three cases． The strength of the recycled aggregate fill wall material under disaster environment was low than that in a normal environment． Soaking the specimen softening coefficient was improved as brick powder dosage reduction，but the softening coefficient of the fired recycled wall material had a significant decrease with a decrease in brick powder content．