فهرست مقالات High-Performance Concrete

• دسترسی آزاد مقاله
  • صفحه چکیده
  • متن کامل
  
  1 - Evaluation of Autogenous Shrinkage in High-Performance Concrete
  Jamal Ahmadi Reza Naghdi2
  Recent tendencies in concrete technology have been towards to high- performance concrete with a low water-cement ratio. However, high performance concretes have some problems. One of the problems is early-age cracking due to autogenous shrinkage. This study presents t چکیده کامل

  Recent tendencies in concrete technology have been towards to high- performance concrete with a low water-cement ratio. However, high performance concretes have some problems. One of the problems is early-age cracking due to autogenous shrinkage. This study presents the results of an experimental investigation carried out to evaluate the autogenous shrinkage of high-strength concrete. According to this, effects of water/binder ratio, cement content, fine to coarse aggregate ratio and silica fume content were evaluated. From the results of this investigation, it can be concluded that the autogenous shrinkage strain of high strength concrete increases with reduction of w/b ratio. The results show also that the variation of cement content and fine to coarse aggregate ratio had only a limited effect on the autogenous shrinkage. پرونده مقاله
• دسترسی آزاد مقاله
  • صفحه چکیده
  • متن کامل
  
  2 - Mix proportioning of high-performance concrete by applying the GA and PSO
  
  Alireza rezaee mohamad reza hasani ahangar
  High performance concrete is designed to meets special requirements such as high strength, high flowability, and high durability in large scale concrete construction. To obtain such performance many trial mixes are required to find desired combination of materials and چکیده کامل

  High performance concrete is designed to meets special requirements such as high strength, high flowability, and high durability in large scale concrete construction. To obtain such performance many trial mixes are required to find desired combination of materials and there is no conventional way to achieve proper mix proportioning. Genetic algorithm is a global optimization technique based on mechanics of natural selection and natural genetics and can be used to find a near optimal solution to a problem that may have many solutions. Particle swarm optimization is another evolutionary searching strategy motivated by social behaviors to obtain optimum answer. This paper presents a method whereby the mixture proportion of concrete can be optimized to reduce the number of trial mixtures with desired properties by using the genetic algorithm and particle swarm optimization techniques. پرونده مقاله