Abstract:
Concrete is one of the most widely used components for construction of buildings, bridges and
other constructions. The strength of concrete depends on the composition and strength of the
concrete forming material. The curing method also affects the strength of concrete. Riau Province
is one of the provinces that has the largest peatlands in Indonesia. Therefore, it cannot be denied
that there are still people in the peat area who still use peat water for concrete mixes. Because the
long distance between the source of clean water and the location of the work causes the work to
utilize the water that is around the work site so that it can accelerate concrete work. This study
uses the SNI 03-2834-2000 method with a cylindrical specimen with a diameter of 150 mm and a
height of 300 mm, testing at 28 days, with each day 3 cylindrical test objects were made. The
planned concrete quality is fc '25 MPa, with 30 - 60 mm cement water, using fresh water from the
borehole of the Faculty of Engineering, Islamic University of Riau and peat water from
Bagansiapi-api, Rokan Hilir Regency as water for mixed and concrete maintenance. From the
compressive strength test of concrete, the highest value of concrete compressive strength was
obtained when concrete used fresh water as a mixture and concrete treatment is at 28 days 35,670
MPa, while the concrete compressive strength using peat water as a mixture and the highest
treatment at 28 days 26,632 MPa. Combined results with the use of fresh water as a mixture and
peat water for maintenance obtained the highest concrete compressive strength at 28 days 29,132
Mpa. While the use of peat water as a mixture and fresh water as a treatment obtained the highest
yield of 28 days 25,671 Mpa. It can be concluded that the use of peat water in this study can still be
said to be feasible to use because it still meets the compressive strength of the plan
