The use of a cover meter is recommended to locate

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The use of a cover meter is recommended to locate reinforcement, for the presence of steel in the core would give uncertain results. The number of required drills depends upon reasons for testing and volume of concrete involved. Moreover, the number of drilled samples should be suitable enough to provide results of acceptable accuracy. Volume = (WT in Air) – (WT in Water) Density of core = Weight air ( Weight air weight water ) Corr. Compression strength of core = compressive strength x The Coefficient of L D factor Compression Strength of cube = 1.25 *corr. strength of cylinder. 1.2 Purpose The aim of this experiment is to examine and carry out compression test for a core cuts from hardened concrete beam and to perform a visual inspection of the interior regions of the member. In this experiment, other physical properties like density and water absorption can be measured.
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2.Instruments Table 1 - Apparatus and Tools Photo2: Beam of hardened reinforced concrete. Photo1: Core drilling machine. Photo4: core sample. Photo3: Crushing machine. 4
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2. Procedure 1 The Beam of hardened Reinforced concrete is rigidly braced onto the core drill machine, to prevent accidental slipping, which gives inaccurate results. 2 Water supply and constant pressure are vital conditions in the core-drilling process.
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