PENGARUH RASIO AGREGAT SEMEN DAN FAKTOR AIR SEMEN TERHADAP KUAT TEKAN DAN POROSITAS BETON POROUS

Arusmalem Ginting

Sari


ABSTRACT

Porous concrete is a special type of concrete with a high porosity that allows water from precipitation and other sources to pass through it, thereby reducing runoff and recharging ground water levels. Compressive strength of porous concrete is lower than the conventional normal weight concrete due to increased porosity. Factors that influence compressive strength and porosity of the porous concrete are aggregate / cement ratio and water cement ratio (wcr), so important to investigate the effect of each factors.

Coarse aggregate used in this study are crushed stone (split) with a density 1466 kg/m3. Coarse aggregate-cement weight ratio used in this study were: 3,5; 4,0; 4,5; and 5,0, the water-cement ratio (wcr) 0,25 and 0,30. Chemical admixtures used are SicaCim Concrete Additive, with a dose 7.5 ml / kg of cement. The samples used in this research were concretes cylinder 150 mm x 300 mm. There were 3 specimens of each variation and the total of specimens were 24. Curing concrete test specimens made by soaking the specimen in the curing box. Compressive strength and porosity of porous concrete testing was carried out after 28 days age.

From these results it can be concluded that increase of aggregate / cement ratio of porous concrete result: decreased compressive strength, increased porosity, and decreased density. Compressive strength of porous concrete with water cement ratio (wcr) 0.25 lower than 0.30.

Keywords: porous concrete, compressive strength, porosity.


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Referensi


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