Experimental Study On Physical And Frost Resistance Properties Of Mixed Aggregate Concrete

Lightweight aggregate and normal aggregate concrete each have advantages and disadvantages, but in some practical engineering, needs a kind of concrete which own both advantages, avoid both shortcomings. mixed aggregate concrete is configured by the lightweight aggregate and crushed stone aggregate at different ratios, this kind of concrete will reach the special project needs and has high compressive strength, light weight, high modulus characteristics and more features.In this paper, different amounts of gravel are mixed replace pumice aggregate concrete physical properties, numerical simulation of crack damage and frost resistance of mixed aggregate concrete are studied. Physical properties includes cube compressive strength, dry apparent density, static elastic modulus and specific strength. Based on the test results ,with the increase of gravel replacement rate, apparent density and static elastic modulus of mixed aggregate concrete close to the linear increase, cube compressive strength and specific strength first increased, then decreased, when the rate of two aggregate reach the best match, there is an largest strength and specific strength. Through the finite element analysis software ADIAN, broken section of concrete was simulated, obtain the simulation and the experimental results is similar. Frost resistance test include compressive strength, quality and dynamic elastic modulus after the number of different freezing-thaw, through the experimental data, analysis the trend of compressive strength, strength loss, weight loss, dynamic elastic modulus loss with the increase of freezing-thaw number and the replacement rates, on the basis of this experimental data, obtain the damage degree of mixed aggregate concrete under the alternative rate. Through the freezing experiment, with the gravel content increased, the frost resistance decreased.