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# Cube compressive strength test

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Introduction

Cube compressive strength test Introduction: By far the most common test carried out on concrete is the compressive strength test. The reasons are that it is commonly assumed that most of the important properties of concrete are directly related to the compressive strength; since concrete has very little tensile strength, it is used primarily in a compressive mode, and therefore it is the compressive strength that is important in engineering practice; the structural design codes are based mainly on the compressive strength of concrete; and the test is easy and relative inexpensive to carry out. This time, we are going to use the three 150mm cube mold which we have made in last 2 week to test their compressive strength. Specimen: Three 150mm cubes (made on 14days ago) Apparatus: Compressive testing machine, calipers, weighing equipment Procedures: 1. The three cubes were removed from the curing tank. 2. Water and grit on the surface of the cubes were wiped off with a damp cloth. 3. Any faults and damages such as broken edge of the cube were visually inspected. ...read more.

Middle

h: 150.45mm, w1: 151.91mm, w2: 151.31, weight: 8.06kg Maximum loading = 887kN Cube (2) h: 150.19mm, w1: 150.32mm, w2: 150.48 , weight: 8.01kg Maximum loading = 909kN Cube (3) h: 150.72mm, w1: 151.36mm, w2: 150.30 , weight: 8.01kg Maximum loading = 891kN Calculations: Cube strength= Load / cross-section area (nearest 0.5 N/mm2) Strength of Cube (1) = (150.45 x 151.91) / (887 x 1000) =39.0 N/mm2 Strength of Cube (2) = (150.19 x 150.32) / (909 x 1000) =40.5 N/mm2 Strength of Cube (3) = (150.72 x 150.36) / (891 x 1000) =39.5 N/mm2 Average strength = (38.81+40.26+39.32)/3 = 39.5 N/mm2 Density of Cube (1) = 8.06 / (150.45 x 151.91 x 151.31) = 2.33 x 10-6 kg/mm3 Density of Cube (2) = 8.01 / (150.19 x 150.32 x 150.48) = 2.36 x 10-6 kg/mm3 Density of Cube (3) = 8.01 / (150.72 x 151.36 x 150.30) = 2.34 x 10-6 kg/mm3 Description of Types of failure Typical satisfactory failure modes of test cubes according to BS 1881: Part 116: 1983: (a) ...read more.

Conclusion

According to the results of the cubes, we can see that all of them are satisfactory failure. Relation between compressive strengths and other strengths The theoretical compressive strength was stated to be eight times larger than the tensile strength. This implies a fixed relation between the two strengths. The ratio of the two strengths depends on the general level of strength of the concrete. Generally, the ratio of tensile to compressive strengths is lower the higher the compressive strength. However, the method of testing the concrete in tension, the size of the specimen, the shape and surface texture of coarse aggregate, and the moisture condition of the concrete will affect the relation between the two strengths. The different test methods yield numerically different results, ordered as follows: direct tension < splitting tension < flexural tension From our results, Splitting tension < Flexural tension << Cube compression < equivalent cube compression Conclusion Although the test of cubes made by fresh concrete should be carried out at exact 28 days age, but strength of the cubes at 14 days ages is almost 85% of the steady strength at the 28 day. When compared the results of other tests, the compressive strength is greatly higher than the tensile strength. ...read more.

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