Α the angle between the surface of sample and the

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α: the angle between the surface of sample and the rebound hammer.
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When the readings are taking there are many factors effects on it as: Mix characteristics: o Cement types. o Cement content. o Coarse aggregate type and shape. Member characteristics: o Mass. o Compaction. o Surface type. o Age (time). o Surface carbonation. o Moisture condition. Average reading ¿ of allreading numberof reading If the any reading isn't near the value of the average we ignored it. 1.2 Purpose :- The aim of this test is to find out compressive strength of concrete with the help of suitable relations between rebound index and compressive strength. In order to assess the quality of concrete in relation to standard requirements.
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5 2. Instruments and Materials: Instruments which are used in this experiment are shown in the table (1) below: Table (1). Instruments used in this experiment Instrument Attached Photo 1) Rebound Hammer devise. 3. Procedure: 1 The Rebound hummer firmly was fixed with angles α = - 90 for cubes and cylinder and α = 0 for beam. Figure (2) Test on Beam 2 The Rebound hummer pushed against the concrete surface with angles α = - 90 for cubes and cylinder and α = 0 for beam. (Note: the test can do at any angles between 0 and 90).
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6 3 The reading was taken from the devise. 4 The reading was compared with graph at specific angles and from this graph we can determined the strength of the concrete. 4. Data & Calculations: Table (1) Rebound hammers readings 10*10*10 Cubes 15*15*15 Cubes prism Beam α = - 90 α = - 90 α = - 90 α = 0 25 35 33 46 21 24 33 52 24 26 26 54 28 24 27 48 33 27 30 51 34 28 - - 16 - - - 21 - - - 19 - - - Average Average Average Average 23.8 25.8 29.8 50.2 7 Table (2) Compressive Strength Sample Types Compressive Strength (Avg.) in MPa 10*10*10cm Cubes 20
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15*15*15cm Cubes 22 Prism 29 Beam 62 5. Conclusion
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