Essay On Concrete Structure

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CONCRETE CRACKING AND USING NON DESTRUCTIVE TESTING TO EVALUATE THE STRUCTURAL INTEGRITY OF A STRUCTURE
Introduction
These days, concrete is the main building material for constructing structures for human use. Buildings and bridges etc. are generally made of concrete. It is extremely important to guarantee that the structure functions properly during their service life.88888.Many concrete structures are prematurely deteriorating and remedial measures are provided to reinstate their serviceability and safety. Deterioration may be a result of several factors, including design, materials used, workmanship, environmental influences during construction and service life, and loads acting on the structure. (HANS) It has become vital to find a dependable and efficient technique for evaluating the condition of a structure at various stages of its life span.

Condition Assessment of Concrete Structures
Traditionally, visual inspections have been the most frequently
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The electrical resistivity of the concrete affects the corrosion rate. An ionic current must flow from the anode to the cathode of the reinforcement for corrosion to occur. 101010101 A high concrete resistivity will decrease the current flowing between the anode and cathode. This will result in a lower corrosion rate. Concrete quality strongly affects the resistivity readings in terms of water/cement ratio, curing and extenders used. A Wenner Probe, which consists of four equally spaced probes, is typically used to measure concrete resistivity. Potential difference in concrete is measured by the inner two probes while current is passed through the concrete by the outer two probes. Resistivity readings when combined with Half - Cell Potential measurements were found to be very accurate. It must however be mentioned that this technique is very sensitive towards humidity and temperature

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