High Temperature Effects On The Properties Of High Strength High Performance Concrete Mixed Waste Rubber Powder

The rubber concrete mixing waste rubber powder concrete as a new building material, which can not only solve the black rubber solid wastes but also improve the mechanical properties of concrete at the same time. The birth of it promotes the development of the science of cement concrete and compared with ordinary concrete, it shows different engineering properties, with light weight, good toughness and shock absorption, sound insulation, heat insulation, impact resistance and other characteristics, and nowadays the high-performance concrete, high strength have already become the trend of development of concrete materials, and study the properties of high strength rubber concrete scholars also become more and more normal, but most just study of room temperature of rubber cement concrete performance, there is little research that is for the high temperature performance. High strength concrete with high temperature and easy to burst. And rubber powder as additive can Improve its internal structure, the burst of HSC after high temperature inhibition, at the same time has the thermal insulation performance, but under different proportion of mechanical properties and thermal properties of rubber concrete is different, so the rubber under different proportion of concrete after high temperature basic mechanical properties and thermal properties of the research has important theoretical and practical significance.In this paper, based on the national natural science foundation of China (number.:51278325), based on the macro mechanical properties of rubber concrete after high temperature test and MIP mercury intrusion porosity measurement, the method of the combination of study under the different proportion of rubber concrete internal defects and pore structure and the relationship of the compressive strength and temperature, for high temperature properties and the toughening mechanism of rubber concrete to provide experiment basis. This paper conducted the following research:Determination of rubber concrete specimens after burning through the compressive strength, splitting tensile strength, axial compression strength, analysis of rubber concrete compressive strength, splitting tensile strength, axial compression strength and temperature, content of interaction relations. Under normal temperature, dosage of rubber concrete compressive strength, splitting tensile strength, the influence of axial compression strength study. The experimental results show that, after high temperature, rubber concrete compressive strength, splitting tensile strength, axial compression strength and decreased with the increase of temperature. Under normal temperature, rubber concrete compressive strength, splitting tensile strength, axial compression strength and decreased with the increase of dosage.With reference to common concrete elastic modulus test method for determination of rubber elastic modulus of concrete specimens after burning through, study its relationship with temperature. Study shows that the elastic modulus of rubber concrete as affected by the fire and gradually reduce the rise of temperature. Under normal temperature, rubber concrete elastic modulus and decreased with the increase of dosage.2. The fracture experiments of rubber concrete after high temperatureReference basis for the hydraulic concrete fracture test procedures (DL/T 533-533) determination of concrete after high temperature rubber specimen fracture parameter, research on crack load, maximum load, fracture toughness, toughness, and the relationship between temperature of instability. It is concluded that with the increase of temperature, rubber concrete crack toughness, toughness both decrease of instability.3. The apparent density of rubber concrete after high temperature and the change of coefficient of thermal conductivity100℃～700℃ was carried out on the rubber concrete after burning through experiment, compared with normal temperature and benchmark concrete, determination of the coefficient of thermal conductivity and apparent density, the experimental results show that with the increase of temperature, thermal conductivity and apparent density of rubber concrete are falling. By discussing the temperature, the relationship between thermal conductivity and apparent density of the three, coefficient of thermal conductivity and temperature respectively, apparent density and temperature, the relation between coefficient of thermal conductivity and apparent density, and establish the launched jointly by temperature and the apparent density function expression of coefficient of thermal conductivity analysis curve.4. After the high temperature rubber concrete pore structure analysisUsing mercury intrusion method under different proportion of rubber inside the concrete pore structure, and analyze the different percentage of pore diameter, it is concluded that with the increase of dosage of rubber powder, the average pore diameter and porosity, most probable aperture increases with the increase of dosage, while the porosity increased, macroscopic compressive strength is reduced, also reduce the thermal conductivity, lower elastic modulus.