PENGARUH PENAMBAHAN PASIR TERHADAP KUAT TEKAN DAN POROSITAS BETON POROUS

Sari

ABSTRACT

Porous concrete consists of Portland cement, coarse aggregate, little or no fine aggregate, admixtures, and water. Porous concrete has high pore volume, which results lower compressive strength. To increase the compressive strength of porous concrete is done by add the sand into the mixture to reduce the pore volume to some extent. Based on these issues, the research on the effect of the addition of sand to the compressive strength and porosity of porous concrete was done.

Cement-coarse aggregate weight ratios used in this study were 1: 5 and 1: 6, and the water-cement ratios (wcr) were 0.3 and 0.4. Chemical admixtures used are SicaCim Concrete Additive, with a dose 7.5 ml / kg of cement. There were 3 specimens of each variation and the total of specimens were 36. The samples used in this research were concretes cylinder 150 mm x 300 mm. Compressive strength and porosity of porous concrete testing was carried out after 28 days age.

From the results of this research, it can be concluded that the addition of sand will decrease in slump value. Slump value of the mixture with water cement ratio of 0.3 is smaller than 0.4, and cement-coarse aggregate ratio 1: 5 is greater than 1: 6. The addition of sand will increase in compressive strength of porous concrete. Compressive strength of porous concrete with water cement ratio of 0.3 is greater than 0.4, and cement-coarse aggregate ratio 1: 5 is greater than 1: 6. The addition of sand will decrease porosity. Porosity of porous concrete with water cement ratio 0.3 is greater than 0.4, and cement-coarse aggregate ratio 1: 5 is smaller than 1: 6. The addition of sand will increase density of porous concrete.

Keywords: addition of sand, compressive strength, porous concrete, porosity.