Testing High Strength Prestressed Concrete Cubes

High strength prestressed concrete cube tests guidelines are guidelines prescribed in the Indian standard code IS: 1343-1980 with respect to quality of materials used in prestressed concrete. The minimum 28 day compressive strength of concrete cubes of 15 cm size, prescribed in the Indian standard code IS: 1343-1980, is 40 N/mm2 for pre-tensioned concrete and 30 N/mm2 for post-tensioned concrete. The characteristic […]

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Testing bulking of sand at the site

Testing Sand Properties at the construction site

Aggregate most of which pass through 4.75 mm IS sieve is known as fine aggregate. Fine aggregate shall consists of natural sand, crushed stone sand, crushed gravel sand stone dust or arable dust, fly ash and broken brick (burnt clay). It shall be hard, durable, chemically inert, clean and free from adherent coatings, organic matter etc. and […]

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Test Cylinder Concrete for Compressive Strength

Compressive Strength Testing the Cylinder of Concrete AIM To determine the compressive strength of concrete cylinders.  APPARATUS Compression testing machine, cylinder mould of 150mm diameter and 300mm height, weighing balance.  PROCEDURE (i) Cast the cylinder and cure for 28 days. (ii) Takeout the specimen from the curing tank. (iii) Wipe out the excess water from the surface […]

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Extracting Concreting Cores and Testing for Strength

While Rebound Hammer, CAPO/Pullout, Windsor probe and ultrasonic pulse velocity tests give indirect evidence of concrete quality, a more direct assessment on strength can be made by core sampling and testing. Cores are usually cut by means of a rotary cutting tool with diamond bits. In this manner, a cylindrical specimen is obtained usually with its ends being uneven, parallel and square and […]

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concrete workability measures

Important Chart on Concrete factors like WORKABILITY, SLUMP & COMPACTING.

CONCRETE FACTORS : WORKABILITY, SLUMP & COMPACTING. Workability, slump and compacting factor of concretes with 20mm or 40mm maximum size of aggregate. Table below shows degree of workability, slump, compacting factor of concrete and suitable uses of that. Degree of workability Slump (mm) Compacting factor Use for which concrete is suitable Small apparatus Large apparatus Very low – […]

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