Study On Basic Mechanical Properties Of Basalt Fiber Recycled Concrete

With the continuous development of China's society and the rising of urban infrastructure and construction industry,the problem of construction waste caused by this is becoming more and more serious,and it is also an urgent problem to be solved.Construction waste comes from the demolition and renovation of urban waste buildings,as well as the collapse of houses due to the destruction of natural disasters such as earthquakes,including muck,scrap concrete blocks,waste bricks and steel bars.The disposal of these construction wastes is usually only transported to the suburbs for stacking and burying.The large amount of dust generated during the transportation process pollutes the air.At the same time,the landfill resources are occupied during the stacking process,and the harmful substances contained therein also pollute the water resources.In contrast,Chinese sandstone resources are facing a serious shortage,and in some areas,high-quality raw aggregates have become exhausted.Under this grim situation,how to turn abandoned construction waste into treasure and realize reuse is an important way to save land and save resources.It is an important measure to develop green cities and green economy,and it also has good development,prospect.In the past ten years,China has carried out comprehensive and in-depth experimental research on recycled aggregates and recycled concrete.Many experimental studies on the basic mechanical properties of recycled concrete generally show that the basic mechanical properties of recycled coarse aggregate concrete prepared by crushing after construction are generally lower than those of natural aggregate concrete.Therefore,how to improve the basic performance of recycled aggregates and recycled concrete,how to maximize the use of construction waste resources has become the focus of attention.A large number of experimental results show that the incorporation of fibers can improve the basic mechanical properties of recycled concrete and has been applied to specific practical projects.As a new type of inorganic green fiber material,basalt fiber has good ductility and economy,and is a new choice for improving the mechanical properties of recycled concrete.According to the concrete strength grade of C35,the compressive and splitting tensile strength of recycled concrete with a replacement ratio of coarse aggregate of 50%of basalt fiber with length of 6mm,12mm and 20mm in volume of 0.15%and 0.3%was studied..The results show that the basalt fiber has a certain enhancement and toughening effect on the recycled concrete with a replacement rate of 50%.The length of 12mm and the basalt fiber with the content of 0.3%have the best effect on the compressive strength of recycled concrete.Basalt fiber has obvious effect on improving the splitting tensile strength of recycled concrete.The tensile strength of basalt fiber recycled concrete with length of 12mm and volume of 0.15%is optimal.Figure[41]table[8]reference[60]...