Comparison of Pre-Stressed Concrete, Partially Pre-Stressed Concrete and Reinforced Concrete in Terms of Different Aspects

2986 Words Nov 3rd, 2011 12 Pages
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
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FRP is useful when the environment or structure does not allow the use of steel, because of magnetic instruments which function in the vicinity. This type of reinforcement has no corrosion, but its fire resistance is quite low (Darwin et al., 2003).
* Throughout the report, the main focus of reinforced concrete will be ferroconcrete, but more specifically, steel rebar.

2.2 Uses

Reinforced concrete is mainly used in the construction of structures. The components in which it can be found are beams, columns, slabs, buildings, bridges, walls and frames. Reinforced concrete is used in all concrete components, sometimes on its own and sometimes in combination with prestressed concrete, depending on the tensile stress that needs to be taken up by the rods (Trelfall, A., et al., 2008). Reinforced concrete on its own is usually used in smaller structures such as one to two storey houses or structures with a small horizontal span.

2.3 Properties

CORROSION PROTECTION
The steel rebar in the concrete has to be protected from corrosion (reacting with oxygen) especially in areas where it is wet and cold. When the rebar corrodes (rusts), the steel flakes and the bond between the concrete and rebar is broken. The rebar cannot fulfill its duty to take up tensile stresses.
Protection from corrosion can be achieved by one of the following methods:
- epoxy coated steel
- hot dip galvanizing
- stainless steel rebar
- corrosion inhibitors mixed in the

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