Pengaruh AIr Gambut Terhadap Sifat Mekanik Underwater Concrete Menggunakan Anti Washout Agent

Underwater concrete can be used as an alternative to replace work dewatering on the structure of buildings in the water in the area of Riau Province. However, at work sites, there is often a shortage of clean water and only peat water is available around this area. Therefore, this research was conducted to examine the effect of using peat water as mixing and curing concrete on the mechanical properties of cast concrete in water (underwater concrete) using an anti-washout agent. The study was carried out with 3 variations of test objects, namely using clean water as a mixture and immersion (AB-AB), clean water as a mixture and peat water as an immersion (AB-AG) and peat water as a mixture and immersion (AG-AG). The results of the compressive strength test at 7 days increased at 28 days for each variation of the test object. In addition, based on the results of tests on compressive strength, split tensile strength and flexural strength at 28 days of age, it was shown that the highest variation was obtained in the AB-AB variation and the lowest variation was obtained in the AG-AG variation for each test. So it can be concluded that casting in a peat environment can reduce the quality of underwater concrete.