Analisis Peningkatan Mutu Agregat Halus Pasir Demak sebagai Bahan Campuran Beton Normal K250

Dwi Agus Rudyanto (Universitas Sultan Fatah)
Masrur Masrur (Universitas Sultan Fatah)

Simetris
Vol 12 No 2 (2018): SIMETRIS

Fine aggregate (natural sand) commonly contains a lot of mud and is fine and round shaped which is generated from a friction process making the stickiness of the granules of which is inadequate. In order to gain a good material, washing is required or we have to mix several kinds of aggregate so as to obtain the desired result. The objectives of this study are finding out the the quality of Demak’s fine aggregate, the quality of the concrete produced, the method of enhancing the quality of the Demak’s fine aggregate, the quality of the concrete that uses the enhanced fine aggregate, the comparison between the quality of the fine aggregate prior to and post quality , enhancement and the quality comparison of the produced concrete. Demak’s fine aggregate has a 8.18 % mud content, a 43.53 % water absorbency and fineness modulus ( granule fine modulus) of 2.44. The concrete that uses the Demak’s fine aggregate has the average pressure strength of 94.61 kg/cm2, modulus of rupture of 10,96 kg/cm2 , and splitting test of 30.66 kg/cm2. The Demak’s fine aggregate after being washed has a mud content of 7.46 %, water content and water absorbency of 15.38 % and FM of 2.67. The concrete that uses washed Demak’s fine aggregate has the average pressure strength of 102.06 kg/cm2, modulus of rupture of 12,02 kg/cm2, and splitting test of 33.33 kg/cm2. The fine aggregate of mixture of 50 % washed Demak’s fine aggregate and 50 % stone dust has the mud content of 6.25 %, water content and water absorbency of 8.24 % and FM of 3.24. The concrete that uses the mixture of 50 % washed Demak’s fine aggregate and 50 % stone dust has the average pressure strength of 138 kg/cm2, modulus of rupture of 16.98 kg/cm2, and splitting test of 44.88 kg/cm2. The highest quality enhancement of concrete for average pressure strength converted into the age of 28 days is 45.88 % on the concrete with the material of which is a mixture of 50 % washed Demak’s fine aggregate and 50% stone dust against the concrete with material of which is Demak’s fine aggregate.