Construction Material

In today global markets and increasing emphasis on quality, need for laboratory data has increased many folds moreover and top of that accuracy and reliability of data is also an equal concern.

Our construction material engineering and testing credentials speak for themselves. Our professional engineers have vast experience and understanding of construction materials and construction practices. Our team of engineers and technicians help our clients anticipate and minimize potential issues and delays.

Our Building Material Testing laboratories are equipped with the latest sophisticated testing equipment. Our services include not only Building and Road material testing services but also engineering observations, structural inspections etc.

STRC has experience in a testing a wide range of construction materials, including Cement, Concrete, Aggregates, Admixture, Fly-ash, Masonry, Tiles, Wood, Steel, Aluminium, Bricks, Quarry stones, WMM, GSB and much more.

Our team of consultants and technologists create customized testing programs to meet the demands of manufacturers having proprietary products. When taking a new or revised product to the market, having it validated by a reputable independent test Laboratory will increase its acceptance in the marketplace.

Rebound Hammer Test is done to find out the compressive strength of concrete by using Rebound Hammer as per IS: 13311 (Part 2): 1992. The rebound of an elastic mass depends on the hardness of the surface against which its mass strikes. When the plunger of the rebound hammer is pressed against the surface of the concrete, the spring-controlled mass rebounds and the extent of such a rebound depends upon the surface hardness of the concrete. The surface hardness and therefore, the rebound is taken to be related to the compressive strength of the concrete. The rebound value is read from a graduated scale and is designated as the rebound number or rebound index. The compressive strength can be read directly from the graph provided on the body of the hammer.

This is a partially destructive test that is used to co-relate various properties of the concrete viz.. UPV, electrical resistivity, rebound number, etc. It is customary to take cores of 4-inch diameter for compressive strength determination. Concrete core drilling for strength determination is again dependent upon various factors for reliability. The conversion of concrete core (typically 3 or 4-inch diameter core) strength into 150 mm saturated cube strength depends upon:

effect of coring

shape factor

size effect

direction of coring w.r.t. the placing of concrete

h/d ratio

With so many factors contributing to the final 150 mm saturated cube strength, the strength variation may be + / – 10% – 15%. However, it can be used to confirm the results of UPV differing largely in the values & also for co-relation. Hence the UPV & core results should be judiciously used, interpreted & co-related.