Comprehensive Benefit Analysis Of Recycled Aggregate Produced By Construction Waste

Since the large-scale urbanization in China,a large number of buildings have been built and destroyed.While improving people's living conditions,beautifying urban landscape and promoting economic development,the rapid development of the construction industry consumes a large amount of resources and energy,which increases the contradiction between China's economic development and environmental protection.Due to the construction defects,the urban planning lacks foresight,urban renewal and transformation speeding up and other reasons,the activities of construction,reconstruction,expansion and demolition are frequent in China,as a result,the output of construction waste is increasing at an alarming rate.In China,construction waste accounts for more than 30% of the total urban waste every year,but the treatment of construction waste in China is still in the primary stage,the main method is landfill,which has caused serious impact on the ecological environment.In the context of global sustainable development strategy,China must fully realize the importance and urgency of saving resources and energy and protecting the environment in the process of economic development.Based on this,this paper proposes to solve the problem of resource shortage and environmental pollution by using construction waste to produce recycled aggregate.However,whether this method is feasible mainly depends on whether it has comprehensive economic and environmental benefits,which is also the focus of this paper.Based on the theory of cyclic economy and life cycle assessment,this paper analyzes and evaluates the economic benefit,environmental benefit and comprehensive benefit of construction waste production of recycled aggregate from the perspective of society,and discusses its feasibility from the perspective of society and national economy.This article used the the research method of literature retrieval,statistical analysis,a combination of quantitative and qualitative analysis,dividing the process of producing recycled aggregate from construction waste into three stages: the production,the transportation,and the landfill,and then established the model of economic benefits and environmental benefits,from the social perspective,made a quantitative analysis of the costs and benefits of the three stages,finally,made an evaluation of the economic and environmental benefits.The results showed that:(1)the economic benefit is not good,the main reason is that the production of recycled aggregate needs to transport a large number of construction waste,resulting in high transport costs,followed by a large demand for equipment,resulting in high investment costs;(2)the environmental benefits is perfect,the main reason is that the production of recycled aggregate reduces the landfill of construction waste by more than 80%,and the environmental cost in the landfill stage is the highest.Finally,the comprehensive benefit is evaluated by the method of national economic evaluation.The results show that the recycled aggregate produced by construction waste has certain contribution to the country and society.