Testing of Hardened Concrete

3893 Words Apr 4th, 2013 16 Pages
Part B: Testing of hardened concrete 1. Objectives:
The objective of the hardened concrete test was to determine the compressive and indirect tensile strength. On the other hand, this experiment was also used to examine the effect of curing condition on strength of concrete, the influence of specimen shape on compressive strength, the effect of compaction on compressive strength and this experiment was also to examine the effect of increasing water to cement ratio on compressive and in direct tensile strengths of concrete. 2. Procedure (Refer AS1012 for full details)
2.1 Compressive Strength * In this test, standard cylinders and cubes will be subjected to uniaxial compressive loading and the load will be applied gradually
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Compressive Strength - Cylinders (Air stored for 28 days)
Observation:

3.3 Indirect Tensile Strength - Cylinders (Water cured for 28 days) Specimen No. | Diameter | Length | Weight | Max. Load | cylinder strength (Mpa) | average cylinder strength (Mpa) | | (mm) | (mm) | (g) | (kN) | | | A1.7 | 100.2 | 201 | 4151 | 151 | 19.1 | 20.1 | A1.8 | 100.1 | 201 | 4137 | 169 | 21.5 | | A1.9 | 100.1 | 203 | 4166 | 155 | 19.7 | | B1.7 | 100.2 | 201 | 4044 | 136 | 17.2 | 16.5 | B1.8 | 100.1 | 201 | 4022 | 129 | 16.4 | | B1.9 | 99.8 | 200 | 4002 | 124 | 15.9 | | C1.7 | 100.2 | 202 | 3899 | 115 | 14.6 | 14.6 | C1.8 | 99.7 | 200 | 3912 | 109 | 14.0 | | C1.9 | 99.9 | 201 | 3903 | 120 | 15.3 | | D1.7 | 99.8 | 198 | 3861 | 96 | 12.3 | 12.3 | D1.8 | 100.1 | 200 | 3837 | 93 | 11.8 | | D1.9 | 100.2 | 198 | 3859 | 102 | 12.9 | |
Table 3 Indirect Tensile Strength - Cylinders (Water cured for 28 days)
Observation

3.4 Ultrasonic Pulse Velocity - Cubes (Water cured for 28 days) Specimen No. | Path Length | Elapsed Time | pulse velocity(km/s) | average velocity(km/s) | cylinder strength (Mpa) | | (mm) | (╬╝sec) | | | | A1.10 | 100.1 | 21.1 | 4.7 | 4.8 | 20.1 | A1.11 | 100.2 | 20.9 | 4.8 | | | A1.12 | 100.1 | 20.7 | 4.8 | |
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