| dc.description.abstract | Concrete is the main material in construction consisting of aggregate,
water and cement. In the current era of globalization, improving the quality
of concrete and its economic value needs to be considered. The development
of concrete technology in the trial addition of mixtures continues to be
carried out in order to concrete and also has economic value. There are
many ways to obtain the desired concrete quality strength, one of which is
by adding additives or replacing the main component materials such as
cement with substituting material. In this study, materials from industrial
waste were used, namely gypsum waste and carbide waste which were used
as a partial replacement for cement in the concrete mixture. In this study,
the waste was used as a cement substitute with gypsum waste of 4% and
carbide of 12%, 14%, and 16% of the total weight of cement. The tests
carried out included compressive strength, splitting tensile strength, and
modulus of elasticity of concrete which would be tested at the age of 28 days
with treatment in the form of immersion in concrete with a total of 40
cylinders of test objects. The sources used in the mixture design are based
on SNI-03-2834-2000. The designed compressive strength is 25 MPa. The
test results show that replacing part of the cement with gypsum and carbide
waste can actually reduce the compressive strength, tensile strength, and
elastic modulus of concrete but has a more favorable economic value. The
results of the compressive strength, tensile strength, and elastic modulus of
cement substitution concrete with gypsum waste variation of 4% and
carbide variation of 12%, 14%, and 16% at the age of 28 days decreased.
In concrete, the variation of 4% and 12% gypsum waste in all tests obtained
the most accepted composition results and can also be used as one of the
variations that can be used in the design of concrete mixtures because all
the requirements are met in terms of compressive strength, tensile strength,
modulus of elasticity, and price and production costs compared to other
variations of gypsum and carbide waste | en_US |
