Mix Multi-objective Optimization Design Of Anti-crack Concrete Base On MATLAB

Concrete structure crack which can reduce concrete durability and make the concrete deteriorating rapidly, has been thought one of principal intrinsic predisposing causes leading structures failure prematurely. The cracks of concrete structures is the combined result of the three aspects of the material, structure, and the environment. But the concrete cracking resistance as the inherent properties of the material is determined by the composition and ratio. Optimization of concrete mix ratio can improve the crack resistance of concrete enhance the durability of concrete and extend the structural life with good practical significance.Concrete with high crack resistance generally has lower coefficient of linear expansion, shrinkage, elastic modulus and higher creep, tensile strength. The paper selects the amount of cement, GGBS content, FA content, water-binder ratio, sand ratio, aggregate parent rock type and aggregate maximum diameter seven parameters as independent variables, strength grade and work performance as the constraint, coefficient of linear expansion, creep coefficient, shrinkage coefficient, elastic modulus and tensile strength as the objective function, base on ACI209(92) and CEB-FIP(1990). Establish a multi-objective optimization model in order to obtain the coefficient of linear expansion, shrinkage, elastic modulus as low as possible, the creep value, tensile strength as high as possible.MATLAB optimization toolbox that integrates a number of direct call functions, provides a more convenient way for the practical application of optimization methods in engineering. The key control parameters and optimized interval of anti-crack concrete mix proportion are obtained with the application of MATLAB language. In addition, the optimization results of multi-objective optimization model are verified using of axial restraint test method by analysis of plate method for reference.