Study On The Workability,Mechanical Property And Anti-chloride Ion Erosion Property Of The Manufactured Sand Concrete

The application of manufactured sand can reduce energy consumption and reduce environmental pollution.In this paper,the strength grade(C30,C40,C60)and the amount of stone powder(0,5%,10%,15%)were prepared.The effect of the content and strength of stone powder on the working,mechanical and anti-corrosion properties of sand concrete was studied.The selected test conditions were:long-term immersion and dry-wet cycle environment,concentration of chloride solution(0,3%,5%,7%),and erosion age 0~360d.Using COMSOL to establish the model,the Cl~-erosion process was simulated,and the solution concentration was 7%,and the Cl~-content in the test block changed with the change of the aging phase.The main research results are as follows:(1)with the increase of the content of stone powder from 0 to 15%,the slump of concrete and the expansion degree of the concrete show the trend of decreasing first,and the C30 and C40 concrete peaks when the content of the stone powder is 10%.C60 concrete at5%slump,expansion to peak.(2)adding appropriate amount of stone powder can improve the compressive strength of the manufactured sand concrete.The strength of C30 sand concrete increases gradually with the increase of the content of stone powder from 0~15%.The strength of C40 manufactured sand concrete increases gradually with the content of stone powder from 0 to 10%,and the strength of concrete decreases gradually over 10%.The strength of C60 concrete increases gradually with the content of stone powder from 0 to 5%,and when the content of rock powder is 5%,the compressive strength of concrete is the highest,and the compressive strength of concrete exceeds 5%gradually.(3)the relative mass of C40 concrete test block increases with the increase of erosion age;With the increase of stone powder content from 0~10%,relative quality change more and more small,the relative dynamic elastic modulus is more and more big,that with the increase of stone powder content 0~10%,Cl~-erosion resistance increase gradually.When the content of stone powder was 15%,the relative mass change was the largest,the relative dynamic elastic modulus was the least,and the anti-Cl~-erosion performance was the worst.(4)the Cl~-content in the dry-wet circulation group was larger than that in the long-term immersion group,and the invasion depth of Cl~-in the test block was within the range of 0~20mm;C30 concrete mixed with 0~10%of the stone powder can improve the anti-seepage performance of the manufactured sand concrete.C40 concrete mixed with 0~5%of the stone powder can improve the anti-seepage performance of the manufactured sand concrete.C60concrete’s resistance to Cl~-erosion decreases with the increase of stone powder.(5)using COMSOL to simulate the intrusion process of Cl~-in the manufactured sand concrete test block under long-term immersion condition,and then resurface Cl~-in the manufactured sand concrete test block internal transfer status.The test results and simulation results are compared.The results show that the simulation results are close to the distribution of Cl~-concentration in concrete,and the test data are reliable.