Research On Application Of Waste Concrete In Cement Stabilized Crushed Stone Base

The progress of economic and technological level has greatly accelerated the development of domestic production,living and auxiliary facilities.In order to ensure the level of infrastructure construction and promote urbanization,the main roads,bridges and auxiliary facilities that have been built are facing demolition or reconstruction.It is the production of a large amount of solid waste materials,the most important of which is concrete agglomerates that are large in size and difficult to degrade.At present,for the related maintenance and repair methods applied to rigid pavement,two types of repair methods are generally applicable: One is to destroy the main body of the pavement structure of the corresponding road section,and directly pave a new high-grade surface layer after stabilization.,Or crush the old pavement as a whole to reconstruct the flexible pavement structure.This method is widely applicable,but the engineering feedback is not good;the second is to clean and remove the rigid panel as a whole,then carry out structural design and pave a new surface layer Structure,this method has great damage to the surrounding environment,and the early project has a lot of waste of resources,which does not meet the needs of sustainable ecological development.After treatment,the above-mentioned broken concrete road slab waste can replace natural aggregates and meet the physical and mechanical properties required by base materials.More importantly,it provides a better idea for waste material processing and meets the green policy strongly advocated by the country.Sustainable engineering requirements.Therefore,this article will take building recycled aggregate as the main research object.By comparing the replacement rate of aggregate during the use of the project and the corresponding actual road performance,it provides reference information for the application of recycled aggregate technology in actual engineering.Among the waste construction waste materials,the largest proportion is waste concrete and bricks.Considering this point,the main waste products are crushed to generate recycled aggregate.According to the existing basic theory and strength and structural requirements of the semi-rigid base,the basic requirements for the performance of the corresponding recycled aggregates are analyzed to provide a theoretical basis for the application of recycled aggregates in actual road construction.Use existing crushing methods to process and produce waste concrete in granular form,conduct indoor tests to verify its surface texture,particle gradation,and more basic properties of materials,and further determine the basic parameters of related indicators.Aiming at the characteristics of recycled aggregates after production,the aggregate performance enhancement technology is proposed.At the same time,statistical analysis of the necessary volume loss rate caused by the aggregate activation process under the existing technical level provides a reference for the use of recycled aggregates in abandoned buildings.According to the actual aggregate supply situation of the project,the optimization design of the base layer mix ratio of concrete mixed with recycled aggregate is carried out,in order to obtain the best mix ratio of cement stabilized gravel that meets the mechanical properties and has other good road properties.According to the optimal moisture content and maximum dry density,the test piece is formed by static pressure method,and the unconfined compressive strength,splitting strength,elastic modulus and flexural strength test of the produced recycled aggregate are carried out.Evaluate the road performance of semi-rigid base course using recycled aggregate.