Impact Resistance Research On Rubberized Concrete

With the rapid development of industrial rubber products, rubber products and people's livelihood are inseparable. Areas of the national economy and people's daily lives on the increasing demand for rubber products, a large number of rubber products are widely used. However, as the rubber products industry booming, large-scale products are used, will inevitably arise with a large number of waste rubber. The environment has been polluted by the large waste rubber, and human health is endangered. So it must be carried out on rubber waste recycling. How to effectively recycle rubber waste is an important issue we have to face. Rubber has a certain flexibility, abrasive resistance and good insulation, so recycled rubber will be broken into powder or particle added into the concrete which not only can reduce rubber waste, but also can improve some properties of the natural concrete.Significant research has been undertaken to better understand the performance characteristics and environmental potential for scrap vehicles tires utilized as an alternative to conventional aggregates in concrete. Most of contemporary studies on rubberized concrete are focused on the strength or workability of rubberized concrete. Very few dealt with the impact resistance of rubberized concrete material. In this paper, based on the research of the green environmental material and the improvement of concrete material performance, the recycled tire rubber particles or powder were added into the concrete to study the impact resistance of rubberized concrete by experimental and numerical simulation method. The main contents of this paper are as follows.(1) Based on C40 natural concrete, the fine aggregate is volumetric substituted by the recycled tire rubber powder or particle, rubber and steel fiber are mixed in order to study the different rubber contents of modified concrete with the density, the cubic compressive strength, dynamic compressive strength, ultimate strain and dynamic increase factor (DIF). Substituted volume of recycled tire rubber power or particle includes 5%,10%,15% and 20%, rubber sizes are 80 mesh,15 mesh and 2 mm respectively. When rubber and steel fiber mixed, the steel fiber is added by materials adding method, volume fraction of steel fiber is 0.5%. (2) The function of rubberized concrete about DIF and strain rate is given for the first time by modifying the relationship about DIF and strain rate proposed by Euro-International Committee for Concrete (CEB) based on the result of SHPB experiment.(3) The H-J-C constitute model is used to simulate the actual SHPB experiment of rubberized concrete, the determination methods of parameters of H-J-C model is obtained on the basis of numerical simulations on rubberized concrete at different strain rates.The analysis results of this paper show that:(1) Rubberized concrete is a typical strain-rate sensitive material, but seems to be less affected by the load rates than normal concrete. To a certain extent, steel fiber added can ehance strain-rate sensitive effect of rubberized concrete material.(2) From the numerical simulation results, it is feasible that the H-J-C constitute model is used to simulate the actual SHPB experiment of rubberized concrete.Finally, this article is put forward some of the issues which need to be resolved or improved.