SGM lab solutions an initiative of sigma test and research center
which was established in 2009 by technocrat educationist who
have over 30 years of experience in the area of education,
administration, manufacturing and marketing.
SGM lab solutions came on floor with an objective to provide
excellence in testing services, equipments, training, calibration,
lab set up facility and aimed at providing its clients technology
that is conducive to fast changing environment and backed by a
group of professionals who have dedicated its formative years in
quality control across various industries.
We offer a complete line of Rebound Hammers for the occasional
user as well as the engineering professional. All hammers are
spring activated and conform to ASTM C-805 as well as other
European and Asian Standards. All are made to the most exacting
machine tolerances to provide the end user with a consistent test
A Schmidt Hammer or a rebound hammer is a device to measure
the elastic properties or strength of concrete or rock, mainly
surface hardness and penetration resistance. Hammer test is done
as per IS: 13311 (part 2) -1992 or ASTM C805/C805 M or ACI
Our Mission at REBOUND HAMMER is to offer innovative and
exceptional analytical process and methodologies that help
industries & organizations of all sizes to achieve
predictable, improved product quality level, turnaround time &
cost associated with testing integrity requirements.
Imagination is threaded into the very fabric of science and
technology. It is the inspiration behind new thoughts and ideas for
doing and creating things that once seemed impossible.
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
underlying principle of the rebound hammer test is :
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.
Test for Concrete
Schmidt Hammer Test
Strength of Concrete
Rebound Hammer Calibration- Calibration of Anvil Rebound
Hammer is what you will get here at Sigma Test Calibration
laboratory. Our calibration services are spread all over the India
and overseas also.
Calibration Of Rebound Hammer
Rebound Hammer Calibration
Calibration Anvil Rebound Hammer
Calibration Of Rebound Hammer
A simple equipment known as Rebound Hammer or Schmidt
Hammer is used for this purpose. Surface hardness measured
during the test give an idea about the soundness and quality of
Locations having very low rebound numbers indicate weak
surface concrete and may be affected by corrosion. The quality of
concrete may be interpreted as shown in the above table.
SGM lab solutions was established with an aim to serve a wide
variety of laboratory and NDT equipments. We believe in serving
products of quality. we offer a complete range of Rebound
hammer and RCPT including its testing & calibration service. We
provided accuracy and assurance for significant experiments.
We constantly work harder to improve the over all quality within
the industry. We are constantly bringing together the best
technical expertise to provide viable and cost-effective solution to
laboratories, while answering the need for affordable, outstanding
and exceptional after sales services and support thus enabling our
customer to attain the highest value for their purchases. We strive
to advance people's knowledge and there ability to enhance their
quality of life. Trust in a strong brand that stands for quality and
innovation in the lab for decades.
Concrete Test Hammer, ideally suited for on-site tests of concrete
and is widely used instrument for analyzing the uniformity and
compressive strength characteristics of concrete structures and
Detection of weak spots in the concrete. Rebound values are read
from a scale for subsequent calculation of the mean. Compressive
strength values can be read from a conversion diagram.
Digital rebound hammer
Digital test hammers are an advanced, completely automated
system for estimating concrete compressive strength. Its
calculation, memory and recording functions allow for quick,
easy and accurate test results.
Discard values for multiple test results can be set; the mean,
median and compressive strength can also be calculated. The
addition of modern microprocessor technology allows the data to
be stored, printed and transferred to a personal computer for
further analysis, or inclusion in your reports.
The Schmidt rebound hammer is principally a surface hardness
tester. The Original Schmidt is available in models with different
impact energies, each test hammer designed for a specific test
The Romans were aware of the fact that good mortar (opus
caementicium) is hard and of a high compressive strength. They
tested its quality subjectively by scratching the surface with an
But only in the mid-20th century was this know-how utilized. A
device was invented which made non-destructive compressive
strength testing feasible.
Digital Schmidt rebound hammer is the most advanced
instrument in its category with follows:
The instruments body lies very comfortably in the hand. The
display is highly readable under any conditions.
A two-layer seal prevents dust and dirt from penetrating to the
interior of the instrument.
The forward and the rebound velocity of the hammer mass are
both measured in close proximity to the point of impact. The
rebound value requires no angular correction.
A larger number of measurement points can be easily collected by
the instrument and automatically evaluated according to
The PROOVE it system is used to evaluate the resistance of concrete to
the ingress of chloride ions in two ways:
By determining how easy it is to force chloride ions into saturated concrete
by applying an electrical potential across a test specimen in accordance
with AASHTO T 277 or ASTM C1202. This is known as the "Coulomb
Test" or the "Rapid Chloride Permeability Test (RCPT)."
By measuring the penetration depth of chloride ions, after an electric
potential has been applied to the specimen in accordance with
NORDTEST BUILD 492 (Chloride Migration Coefficient from NonSteady State Migration Experiments) to determine the "Chloride Migration
Coefficient," which can be used to estimate the chloride diffusion
coefficient for service life calculations.
A water-saturated concrete specimen, 100 mm diameter and 50
mm thick, is positioned in a cell (right and page 104) containing
fluid reservoirs on both sides. For the RCPT or Coulomb Test,
one reservoir is filled with a 3 % NaCl solution and the other with
a 0.3N NaOH solution. A potential of 60 VDC is applied across
the cell. The negative terminal is connected to the electrode in the
reservoir with the NaCl solution and the positive terminal is
connected to the electrode in the NaOH solution. The negatively
charged chloride ions will migrate towards the positive terminal.
The more permeable is the concrete, the more chloride ions will
migrate through the specimen, and a higher current will be
measured. The current is measured for 6 hours. The area under
the curve of current versus time is determined, which represents
the total charge or Coulombs passed across the specimen.