Study On Mechanical Properties Of Aeolian Sand Replacing River Sand Concrete

With the development of China's "western development" strategy,on August 15,2019,the national development and reform commission issued the master plan for a new land and sea corridor in the west,making it clear that it will be basically completed by 2025.With the significantly increase of infrastructure,in our building materials concrete is currently the most widely used in building materials,widely used in various industrial and civil building,river sand is an integral part of concrete material,in order to protect the environment protection channel to reduce damage,aeolian sand instead of river sand concrete has become the focus problem,research on the economic environment problems such as it has a long term.In this paper,the compressive strength test of aeolian sand concrete with different sand content and different amount of aeolian sand was conducted.The influence of aeolian sand on the compressive strength of concrete was analyzed from the macroscopic and microscopic levels by the scanning electron microscope(VEGA.IIXMU)test.Sand ratio 40% > 20%.The influence of C25 concrete and aeolian ginseng on the strength was 30%>,10%>,0%>,60%>,90%.Sand ratio 45% > 35%.The optimal mix ratio of aeolian sand concrete was found to have the strongest compressive strength between 20% and 40% of aeolian sand.Secondly,based on the monte carlo method,the structure of the aeolian sand concrete aggregate in the ideal state is generated,and the distribution is reasonable.The number of the aggregate in each particle size is calculated by using the ideal fuller set matching curve,and the finite element model is generated in ANSYS through the programming language of MATLAB.The failure models of eolian sand concrete under different conditions and the stress-strain curves of eolian sand concrete under random distribution of eolian sand were constructed successfully.The damage initiation position and failure path trend were observed under the macroscopic condition and section condition,and the reasons for the change of the failure path of eolian sand concrete and its influence on the macroscopic mechanical behavior were analyzed.To a certain extent,the relationship between the development trend of concrete failure and the mesoscopic structure is obtained.