What Is the J-Ring Test? The J-Ring test is used to evaluate the passing ability of Self-Compacting Concrete (SCC) in accordance with ASTM C1621/C1621M. Passing ability is the capacity of fresh concrete to flow under its own weight through congested reinforcement and other obstructions without vibration, segregation, or blocking. The test compares the flow of … Read more
Why does this test exist? Steel reinforcement in concrete is protected by the high alkalinity (pH of about 12.5 or more) of the cement paste, which forms a thin passive film on the bar. Chloride ions, coming from sea water, deicing salts, contaminated aggregates or groundwater, can break down this film. Once enough chloride reaches … Read more
Carbonation Depth Test Concrete may look perfectly sound on the outside while its protective environment around reinforcement is slowly changing beneath the surface. One of the simplest ways to investigate this process is the Carbonation Depth Test using phenolphthalein indicator. The test is particularly useful when assessing the durability condition of existing reinforced-concrete members and … Read more
Ultrasonic Pulse Velocity (UPV) Test of Concrete The Ultrasonic Pulse Velocity (UPV) test is a non-destructive test used to assess the quality and uniformity of hardened concrete without damaging the structural member. It is particularly useful for identifying areas that may contain cracks, voids, honeycombing, or other internal defects. Reference Standard IS 516 (Part 5/Sec … Read more
Concrete durability is often governed not only by its compressive strength but also by the quality of its surface zone. The outer layer of concrete is the first line of defence against rainwater, moisture and other environmental actions. A concrete surface that absorbs water rapidly may indicate poor finishing, inadequate curing, a porous surface layer … Read more
Codal Provisions from IS 516 (Part 1 / Section 1) If you are involved in construction, quality control, or civil engineering, keeping up with standard codes is crucial for safety and compliance. The Bureau of Indian Standards updated its concrete testing protocols with IS 516 (Part 1 / Section 1): 2021. This comprehensive standard outlines … Read more
Rebound Hammer Test The Schmidt rebound hammer is principally a surface hardness tester with little apparent theoretical relationship between the strength of concrete and the rebound number of the hammer. However, within limits, empirical correlations have been established between strength properties and the rebound number. Further, scientist has attempted to establish a correlation between the … Read more
Bulking of Sand – What, Why & How? After watching this video you will be able to answer following questions. What is bulking of sand? Why bulking happens? What are the factors affecting bulking of sand? How to measure bulking of sand at site? What are the effects of bulking on concrete? How to apply … Read more
SUITABILITY OF WATER FOR CONCRETE MIXING OBJECTIVE To assess suitability of water for use in concrete mix. Equipment Measuring cylinder Cube moulds Trowel Tamping rod Vibrating table Testing machine Procedure Analyse water for its chemical compositions as per IS 3025-1964 and compare these with permissible limits given in IS: 456-2000. In case water does not … Read more
FLEXURAL STRENGTH TEST OF CONCRETE Objective To determine the Flexural Strength of Concrete, which comes into play when a road slab with inadequate sub-grade support is subjected to wheel loads and / or there are volume changes due to temperature / shrinking. Reference Standards IS: 516-1959 – Methods of tests for strength of concrete Equipment & … Read more
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