Rodded Unit Weight of Coarse Aggregates Test (ASTM C29)

Rodded Unit Weight of Coarse Aggregates PURPOSE Determination of the unit weight of coarse aggregates in a compacted condition. This test method is applicable to aggregates not exceeding 15 cm in nominal size. The unit weight so determined is necessary for the design of a concrete mixture by the absolute value methodز EQUIPMENT AND MATERIALS …

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Compacting Factor Test

Compacting Factor Test

There is no generally accepted method of directly measuring the amount of work necessary to achieve full compaction, which is a definition of workability. Probably the best test yet available uses the inverse approach: the degree of compaction achieved by a standard amount of work is determined. The work applied includes perforce the work done …

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Flow Table Test

Flow table test

Flow Table Test This test was covered by BS 1881 : 105 : 1984. The test is appropriate for concrete of high and very high workability, including flowing concrete which would exhibit a collapse slump. The apparatus consists essentially of a wooden board covered by a steel plate with a total mass of 16 kg. …

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How to Prepare Cube Samples from Fresh Concrete?

concrete admixtures

Most standards have laid down the acceptance criteria of quality concrete. In all the cases, the 28-days compressive strength shall alone be the criterion for acceptance or rejection of the concrete. 7 days compressive strength of concrete can be carried out in order to get a relatively quicker idea regarding the quality of concrete. PROCEDURE OF …

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Compaction Factor Test

In this article, the Compaction Factor Test is discussed which is used to calculate the compaction factor, and to know more about workability. Compaction Factor Test Objective: To calculate the compaction factor, and to know more about workability. Introduction: These tests were developed in the UK by Glanville (1947) and it is measure the degree of …

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Rebound Test: Equipment – Operation

In this article, the Rebound Test (schmidt hammer test) is outlined. The Swiss engineer Ernst Schmidt, first developed a practicable rebound test hammer in the late 1940s, amd modern versions are based on this. Figure 1 shows the basic features of a typical type N hammer, which weighs less than 2 kg, and has an impact energy of …

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Non-Destructive Testing of Concrete (NDT)

In this article “Non-Destructive Testing of Concrete” brief description is given for methods used to assess concrete strength and durability without damage. Non destructive test is a method of testing existing concrete structures to assess the strength and durability of concrete structure. In the non destructive method of testing, without loading the specimen to failure …

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Splitting Tensile Strength of Concrete

splitting tensile strength

One of the important properties of concrete is “tensile strength” as structural loads make concrete vulnerable to tensile cracking. Tensile strength of concrete is much lower than its compressive strength (that’s why steel is used to carry the tension forces). It has been estimated that tensile strength of concrete equals roughly about 10% of compressive …

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