High Performance Recycled Concrete Acid Rain Erosion Performance Evaluation Of Research And Environmental Coordination

The conflicts between social development and environmental is becoming more and more serious. Currently, concrete was maximum amount of building materials and should take the road of sustainable development. Moreover, along with the continuously spreading of acid rain,it will make new challenges to the durability of concrete structures. In view of this, the high performance recycled aggregate concrete and the effects of acid rain on the deterioration and environmental coordination of high performance recycled concrete were investigated in this paper. This research will benefit for application of recycled aggregate concrete,and provide theoretical basis and technical support for the design of recycled aggregate concrete. At the same time, it has very important significance to the development and use of green building materials.In this paper, the campaction degree of cementitious material was calculated and analysised by Andreasen equation model and Aim-Goff model. Through analysis and comparison of the error D and virtual accumulation densityΦ,the two models have been a good correation. On this basis, determined the ratio of the cement, fly ash and silica fume, which maked cementitious material system to gain the maximum density, provided technical support for the high performance recycled concrete. The high performance recycled aggregate concrete has mixed with 20% fly ash,8% silica fume, and appropriate superplasticizer. The replacement of recycled coarse aggregate by mass was 100%. With the ordinary recycled concrete and the natural stone aggregate concrete as a comparison group. deterioration of high performance recycled concrete specimens caused by simulated acid rain was investigated by laboratory tests. In the solution of simulated acid rain whose PH value was 3.4, the compressive strength, weight loss, the neutralization depth and the abrasion resistance of the high performance recycled aggregate concrete was better than the normal recycled concrete and the natural stone aggregate concrete after soaked for 108 days. By contrast, the evaluation about the environmental friendliness for high performance recycled concrete in the process of acid-rain corrosion has been taken. The evaluation of environmental coordination in this article includes environmental disruption, performance changes in the acid rain erosion process and the economy in life cycle. Set up a model based on the three indexes, and integrate them into coefficient of P, which is an overall indicator that can evaluate the environmental friendliness in the process of acid rain corrosion. The result shows that P was good reflect the overall indicator for concrete. The high performance recycled concrete was a nice environmental material, which showed great combined properties, so it's one of future directions for concrete development.