Study On Key Technology Of Eco-type Nano-Photocatalytic Total Recycled Concrete

The rapid development of the civil industry,resulting in a large number of waste concrete,the traditional treatment is open to the ground,or buried underground.But this also caused the environmental pollution,waste of land resources.Therefore,reasonable handling of construction waste is a new model for the sustainable development of the civil industry.The rapid development of the automobile industry,not only brought convenience,economic development,while the automobile exhaust and other issues,seriously affecting the ecological environment.The main pollutants in the vehicle exhaust HC,NO_x,CO₂ can not only cause cancer and cause poisoning,so that other parts of the human respiratory system outside the tumor incidence increased,threatening human health;but also pollute the surrounding atmosphere and soil environment,leading to greenhouse Effect,acid rain and a series of environmental problems,affecting the ecological environment,so that global economic growth can not be immeasurable losses.So a reasonable solution to the problem of automobile exhaust,is the current research hot spots.Aiming at the above two problems,this paper presents the preparation technology of eco-type nano-photocatalytic full-recycled concrete.Eco-type nanophotocatalytic full-life concrete is a solution to the recycling of waste concrete and the photocatalytic function of pavement materials.The regenerated coarse aggregate,recycled fine aggregate and regenerated powder were prepared by using waste concrete,and the photocatalyst nano-TiO₂ was supported on it.All the recycled aggregates were prepared by using nano-photocatalytic whole regenerated concrete.Thus at the same time to solve the waste concrete treatment and air pollutant purification two major problems.In order to test the performance of the new functional materials,this paper uses the method of experimental research,and at the same time,through the method of life cycle?LCA?,the mechanical properties and photocatalytic performance of nanophotocatalytic fully regenerated concrete are studied from macroscopic and microscopic Carried out a preliminary exploration and research.The main contents and conclusions are as follows:?1?From the idea of using all the recycled aggregate of aggregate,the optimum amount of recycled coarse aggregate and recycled coarse aggregate was obtained by the experimental method.The results show that:?a?the optimal substitution rate of regenerated powder is 3%;?b?the optimal substitution rate of recycled fine aggregate with nano-TiO₂ is 30%;?c?The regenerated coarse aggregate The best replacement rate is 30%.?2?From the micro level,the reason for the enhancement of the mechanical strength of the whole regenerated concrete with nano-photocatalysis is explained.?B?whether the aggregate is loaded with nano-TiO₂,and the performance of the aggregate is higher than that of the natural aggregate.?B?Whether the aggregate is loaded with nano-TiO₂,It is feasible to show that the nano-particles are loaded on the pores and cracks of the surface of the recycled aggregate,indicating that the experimental method of soaking the nano-TiO₂ on the recycled aggregate is feasible by soaking the recycled aggregate with TiO₂ solution;?c?comparing the ordinary recycled concrete Nano-photocatalytic regeneration of concrete,the contrast can be clearly seen that the hydration products of nano-TiO₂,filled with recycled concrete holes,cracks,and enhance the mechanical properties of recycled concrete.?3?The photocatalytic activity of nano-photocatalytic fully regenerated concrete was measured under the laboratory conditions by self-made photocatalytic performance test.The NO₂ efficiency of nanometer TiO₂ was 18% in 40 min.?4?Analyze the feasibility of using nano-photocatalytic fully recycled concrete,and use the method of life cycle cost?LCA?,and use the method of cash flow analysis to obtain the use and popularization value of new functional materials.