Disadvantages Of Reinforced Concrete

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CHAPTER ONE: Introduction 1.1 General: Reinforced concrete is one of the most important available materials for construction in Egypt and all over the world. It is used in almost all structures as: buildings, shells, bridges, tunnels, tanks and retaining walls. Concrete is made by mixing binding materials as sand and gravel held together with a paste of cement and water. The use of admixture is to change certain characteristics of concrete such as workability, durability and time of hardening. Concrete has many advantages, such as high compressive strength, ability to cast in almost any desired shape, economical and fire resistance. Yet, there are some disadvantages, like low tensile strength, low ductility and cracking. Regardless those disadvantages,…show more content…
The material is now being used in an ever increasing number of applications, ranging from one step house casting to low density voids fills. Foamed concrete has a surprisingly long history and was first patented in 1923. Although there is evidence that the Romans used air entrains to decrease density, this was not really a true foamed concrete. Significant improvements over the past 20 years in production equipment and better quality surfactants (foaming agents) have enabled the use of foamed concrete on a larger…show more content…
The experimental program included testing of lightweight concrete specimens under concentric axial load in both tension and compression, to obtain the actual stress-strain properties of the produced FBLWC. The concrete mix using foam balls, previously designed at Ain Shams University, were used. Different specimens' shapes like prisms, cylinders and cubes were tested to obtain the mechanical properties such as compressive strength, young modulus, tensile strength and flexural strength. In the numerical phase, a finite element model program "SOFISTIK" was developed, to be used for the simulation of nonlinear behavior of lightweight concrete. This finite element model was validated using previous experimental results available in literature and self-performed tests. The model was calibrated and used to perform a parametric study on the behavior of lightweight concrete. Many researches had been done on the lightweight concrete to describe the nonlinear behavior. The previous researches faced obstacles concerning the inaccuracy of the models results because of the lack of the experimental results. Therefore, it is necessary to focus on the laboratory program to get many mechanical properties in order to help calibrating a

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