Cement Consistency and initial & final setting time test

The test is called “Consistence and setting times of Portland cement”; this test was separated into two parts. The first one aims to get the consistence of standard cement paste, and the second one is to calculate the initial and final setting time of neat cement past of standard consistence. As the amount of water used in hydrating cement affect s...

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Specific gravity of hydraulic cement

This test covers the determination of the hydraulic cement. It is used in connection with the design and control of concrete mixtures. Specific gravity is normally used in mixture proportioning calculations. The specific gravity of Portland cement is generally around 3.15 while the specific gravity of Portland-blast-furnace-slag and portland-pozzol...

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Fineness of hydraulic cement

This test method covers the determination of the fineness of hydraulic cement, using the Blaine air permeability apparatus, in terms of the specific surface expressed as total surface area in square meters per kilogram of cement. The Blaine apparatus draws a defined volume of air through a prepared bed of cement of defined porosity.

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Soundness of Portland Cement

It is very important that the cement after setting shall not undergo any appreciable change of volume. Certain cements have been found to undergo a large expansion after setting causing disruption of the set and hardened mass. This will cause serious difficulties for the durability of structures when such cement is used. The testing of soundness of...

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Loss on ignition of Portland cement

Loss on ignition is calculated by heating up a cement sample to 900 - 1000°C (1650 - 1830°F) until a constant weight is obtained. The weight loss of the sample due to heating is then determined. A high loss on ignition can indicate pre-hydration and carbonation, which may be caused by improper and prolonged storage or adulteration during transport...

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SLUMP TEST

The concrete slump test is used for the measurement of a property of fresh concrete. The test is an empirical test that measures the workability of fresh concrete.More specifically, it measures consistency between batches. The test is popular due to the simplicity of apparatus used and simple procedure. The slump test is used to ensure uniformity f...

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Unit weight, yield and air content of concrete

Density, called ―unit weight‖, covers the determination of the mass per cubic meter (or cubic foot) of freshly mixed concrete and gives formulas for calculating the yield, relative yield, and the air content of the concrete.Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials. Since cemen...

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Air content test of freshly

This test method covers the determination of the air content of freshly mixed concrete. The test determines the air content of freshly mixed concrete exclusive of any air that may exist inside voids within aggregate particles. For this reason, it is applicable to concrete made with relatively dense aggregate particles and requires determination of...

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Concrete compression test

This ASTM test method covers the determination of the unconfined compressive strength of cylindrical concrete specimens. The test method consists of applying a compressive axial load to molded cylinders (or cores) at a rate which is within a prescribed range until failure occurs. The compressive strength of the specimen is calculated by dividing th...

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Schmidt hammer test for concrete

The concrete hammer is a hand held instrument used for testing the quality of hardened concrete in a structure.On new structures, once the concrete has hardened, the instrument can be used to give an indication of the gain in concrete strength. On existing structures, it can be used to gain an estimate of the uniformity of the concrete.

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Pulse velocity through concrete

This test method covers the determination of the propagation velocity of longitudinal stress wave pulses through concrete. This test method does not apply to the propagation of other types of stress waves through concrete.This test method is applicable to assess the uniformity and relative quality of concrete, to indicate the presence of voids and...

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Half cell potential measurement

This test is used to assess the corrosion conditions in a reinforced concrete structure. The method detects the likelihood of corrosion of steel but can not indicate the rate of corrosion. By making measurements over the whole surface, a distinction can be made between corroded and non-corroded locations.

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Steel Bar locator & concrete cover test

The test is aimed mainly to detect the location and cover of reinforcement. The test may be used for analyzing the integrity of the structures as the cover thickness is an important aspect of construction. In the coastal areas, the test can be used for deciding the effectiveness of cover as well as rehabilitation measures required.

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