Investigation Of The Deformation Behaviors Of The Concrete With The Whole Steel Slag Aggregate Modified By The Colloidal Particles Of Waste Tires And Its Mechanisms Research

Steel slag is the main by-product in the process of steel making, while the comprehensive utilization rate is now less than 10%. However, it is important to utilize steel slag effectively. Concrete is the largest amount of material in the construction, and 70%~80% volume of it is aggregate. The large amount of using steel slag and don’t need to ground steel slag particle treatment for it can be used as the aggregate in the concrete, while it has restricted the application of steel slag in concrete because the expansive of steel slag have caused many serious problems in projects. At the same time, waste tires have become the new solid waste pollution source and cause a series of environmental problems. Waste rubber particles added into concrete can make significantly improvement for the concrete toughness, crack resistance and deformation performance. Particles added in concrete have inhibitory effect of concrete volume expansion deformation because of particles on the concrete stress buffering effect for particles partially replace fine aggregate in steel slag concrete, which would provide theoretical support for the rational use of steel slag and waste tire in building materials. Besides, it would benefit for the finally achieving of bulk volume, low energy consumption utilization of steel slag, which simultaneously reveals the good economic and environmental benefits of it.The paper focuses on the study of volume deformation behavior and mechanism for the particles adding steel slag concrete. The result is helpful to solve the bottleneck of steel slag expansion which restricts the high efficiently application of large dosage, low energy consumption in concrete. To study the effect of colloidal particles on the properties of the steel slag concrete, we design different replacement ratio(0, 5%, 10%, and 15%) of the new mixing performance of steel slag concrete, compressive strength, early plastic cracking, and the volume deformation test. Compared with ordinary concrete, the test results show that the compressive strength of steel slag concrete is greatly improved. The volume expansion of steel slag concrete has good inhibition effect with the addition of colloidal particles and the 10% replacement rate of particles is optimal for considering the comprehensive concrete performance.Considering the expansion effect of steel slag from the chemical reaction kinetics and the essence that the expansion phase react hydration reaction with water, thus it is very important to study steel slag concrete through the migration of internal water and the access and transmission of outside water of concrete. We can Study the expansion effect of steel slag through the establishment of the expansion chemical reaction kinetics model. Basing on the establishment of two-dimensional random aggregate model, it has a good reference value by using ANSYS to analysis the concrete volume deformation under the moisture and heat coupling for the numerical simulation agrees well with the experimental data.