Study On Fracture And Damage Performance Of Tailings Cement-based Composite Materials

At present, China has problems for tailings occupation of land and the environmentalimpacted. Research and development in the utilization of iron ore tailings have someprogress and achievements, but can not fundamentally solve the problem. Therefore, thispaper studies the effective use of tailings. And I studied to achieve optimal allocation ofresources and sustainable mineral mining economic development.Based on the study which the basic theory of fracture and damage mechanics. Tailingsfor incorporation of PVA fiber reinforced cement-based composite materials experimentsand numerical simulation of. The main work is:(1) Content from tailings, fracture height ratio, fiber content, fracture and damageproblems study under conditions of normal use of cement-based composites. The maintailings content, fracture height ratio, fiber content variation of parameters and fracturedamage variable under changing conditions. And to get the results I use Meso numericalsimulation software RFPA. The experimental results compared with the results ofmicroscopic simulation and verification.(2) Study the cement based composites fracture and damage performance in corrosiveconditions of use salinization. The main tailings content, fracture height ratio, fiber contentvariation of parameters and fracture damage variable under changing conditions. And toget the results I use Meso numerical simulation software RFPA. The experimental resultscompared with the results of microscopic simulation and verification.Study results show that: the fracture parameters with increasing content of the tailingsand increases then decreases, with the increase of fracture height ratio decreases, withincreasing fiber content increases. Meanwhile fracture parameters under the normal useconditions are higher than the value of the fracture parameter values under salinizationcorrosion use conditions. Based on the comparison, we choose the optimal ratio of isWXC-50-2. That is under normal conditions of use tailings that content is50%and fibercontent of is2%. The damage parameters with increasing content of the tailings increases, with the increase of fracture height ratio increases, with increasing fiber content decreases.Meanwhile fracture parameters under normal use conditions are higher than the value ofthe fracture parameter values under salinization corrosion use conditions. Based on thecomparison, we choose the optimal ratio is WXC-0-2. That is under normal conditions ofuse tailings that content is0%and fiber content of is2%. Finally get the optimal mix ofWXC-50-2.