PENGARUH PEMAKAIAN BAHAN TAMBAH TAWAS PADA AIR RAWA TERHADAP COMPRESSIVE STENGTH BETON

Abstract

Kenten Laut is a rural locality in the Talang Kelapa District that consists largely of a swamp. Residents
rely heavily on the swamp's corrosive water for mundane concrete mixing. Researchers in this study used
swamp water and alum in the concrete recipe. Swamp water and alum were utilized as the supplementary
components, with the alum content of the solution varying between 2% and 4% by weight of cement. The
test object is a cube with the dimensions (15, 15, and 15) cm and there are fifty of them.
Compressive strength testing in swamp water revealed findings of 152.69 kg/cm2 for 14-day-old concrete
and 251.93 kg/cm2 for 28-day-old concrete. The compressive strength of 14-day-old swamp water concrete
varied between 156.16 kg/cm2 and 149.78 kg/cm2 depending on the percentage of alum added to the mix.
Compressive strength values for 28-day-old concrete made with swamp water with 2%, 4%, or 6% alum
are 256.19 kg/cm2, 253.97 kg/cm2, and 245.61 kg/cm2, respectively. These numbers are lower than what
was anticipated for the K-300. Compressive strength in typical concrete drops by 20.6% after 28 days of
age, but only 14.7% after 14 days.