PENGARUH LIMBAH ABU ALUMUNIUM SEBAGAI SUBTITUSI AGREGAT HALUS DENGAN FAKTOR AIR SEMEN YANG BERBEDA PADA BETON RINGAN TERHADAP KUAT TEKAN DAN ABSORBSI

Abstract

Lightweight concrete is concrete containing light aggregate and has a density less than 1900 kg / m3 (SNI-03-2847-2002). The purpose of this thesis is to examine the effect of the utilization of aluminum ash waste for fine aggregate substitution with variations in the water cement ratio of 0.40, 0.50 and 0.60 in terms of concrete compressive strength, absorption power and production cost of making lightweight concrete with fine aggregate substitution using aluminum ash waste compared to lightweight concrete without a mixture. Using the ash as a substitution material of sand in concrete by 10% and the variation of water cement ratio of 0.40, 0.50 and 0.60, identifying the physical properties of aluminum ash, aggregate physical properties, hard concrete performance including concrete compressive strength and absorption. Hard concrete performance testing is carried out at the age of 7, 14, 21 and 28 days. Test objects for W/C ratio 0.4 as many as 15 pieces, for FAS 0.5 as many as 15 pieces and for FAS 0.6 as many as 15 pieces with a total of 45 test specimens. The results of the study are as follows: performance of concrete with 10% aluminum ash mixed concrete with a water cement ratio of 0.4 produces a concrete compressive value of 3.83 MPa with a weight of 1553 kg / m3. The compressive strength does not meet the target compressive strength of 17.24 MPa and the cost used to make 1 m3 of concrete mixture is cheaper Rp. 22,930.05 of concrete without alumunium ash mixed. Based on the analysis used, the use of aluminum waste ash requires another method when making the mix design and the use of light aggregate needs to be studied beforehand so that the target concrete compressive strength is as planned and aluminum waste ash mixture is preferred for non-structural concrete or lightweight concrete mixtures