Comparison of Pre-Stressed Concrete, Partially Pre-Stressed Concrete and Reinforced Concrete in Terms of Different Aspects
1. INTRODUCTION
1.1 Background
The report will mainly focus on the differences between reinforced, prestressed and partially stressed concrete. These concrete reinforcing methods differ in the period they have been used. Reinforced concrete was developed by a nursery owner in Paris in 1867, Joseph Monier, applying it to practical use for the first time (Salmon & Wang, 2007). Prestressed concrete’s discovery dates back to the late 1800’s. Freyssinet was one of the first engineers who used this method and realised that, for this method, high quality concrete with very high tensile steel wires, stressed as high as possible was needed (Chris Burgoyne, 2005).
The chief purpose of reinforcement methods is to strengthen concrete in its tensile capacity. Concrete can support loads when in compression, but it cannot handle any tensile stress, which leads to the cracking, shrinking and creeping of concrete. Therefore, reinforcement is placed at areas in the concrete where tensile stresses develop. In this report the reinforcement methods will for the most part be discussed in terms reinforcement in beams. Stresses in a beam develop as illustrated in the following figure:
Choosing the right methods of reinforcement for a specific concrete element will depend on the properties of the concrete mix and the materials of which the reinforcement is made. The properties of the materials include tensile strength, compressive strength, elasticity, creep and shrinkage, durability, expansion coefficient and other related properties. Other aspects, such as the economical implementation and resources, must also be taken into account when choosing reinforcement.
In practise the best method of reinforcement to apply in concrete, in a specific structure, has to be identified in order to be able to design an appropriate structure which can uphold the forces that act upon it. The properties of the reinforcement thus have to be known.
The report discusses the different
1.1 Background
The report will mainly focus on the differences between reinforced, prestressed and partially stressed concrete. These concrete reinforcing methods differ in the period they have been used. Reinforced concrete was developed by a nursery owner in Paris in 1867, Joseph Monier, applying it to practical use for the first time (Salmon & Wang, 2007). Prestressed concrete’s discovery dates back to the late 1800’s. Freyssinet was one of the first engineers who used this method and realised that, for this method, high quality concrete with very high tensile steel wires, stressed as high as possible was needed (Chris Burgoyne, 2005).
The chief purpose of reinforcement methods is to strengthen concrete in its tensile capacity. Concrete can support loads when in compression, but it cannot handle any tensile stress, which leads to the cracking, shrinking and creeping of concrete. Therefore, reinforcement is placed at areas in the concrete where tensile stresses develop. In this report the reinforcement methods will for the most part be discussed in terms reinforcement in beams. Stresses in a beam develop as illustrated in the following figure:
Choosing the right methods of reinforcement for a specific concrete element will depend on the properties of the concrete mix and the materials of which the reinforcement is made. The properties of the materials include tensile strength, compressive strength, elasticity, creep and shrinkage, durability, expansion coefficient and other related properties. Other aspects, such as the economical implementation and resources, must also be taken into account when choosing reinforcement.
In practise the best method of reinforcement to apply in concrete, in a specific structure, has to be identified in order to be able to design an appropriate structure which can uphold the forces that act upon it. The properties of the reinforcement thus have to be known.
The report discusses the different