PENGARUH PENAMBAHAN ABU VULKANIK GUNUNG KELUD TERHADAP KUAT TEKAN BETON

Abstract

ABSTRACT
This study aims to determine the chemical content Volcanic Ash Kelud and determine
the effect of volcanic ash that has burned at a temperature of 600ºC for concrete compressive
strength. Testing will be done on the physical properties and chemical composition of the
Volcanic Ash content Kelud using Atomic Absorption Spectrometry (AAS) and Gravimetry
include the content of Al2O3, Fe2O3, SiO2, H2O and LO1. This test refers to ASTM 618-03 and
SNI 15-0302-2004. Further testing concrete compressive strength with three cylindrical concrete
specimen with a diameter of 15 cm and a height of 30 cm to 28 days on each variant. The
addition of volcanic ash Kelud varied with dose of 0%, 5%, 10%, 15% and 20% of the weight of
cement needed. Data were analyzed with descriptive-quantitative method to determine the
feasibility of volcanic ash in concrete production based on the requirements of new chemical
elements Pozolan nature. The results showed that of the test sample composition chemical
constituents Volcanic Ash Kelud from Pringwulung village, Depok, Sleman qualify as natural
Pozolan. The greater the increase percentage of volcanic ash on the weight of the cement, the
compressive strength of concrete produced increasingly large, the compressive strength of
concrete against any variation on the addition of volcanic ash Kelud 0%, 5%, 10%, 15% and
20% obtained compressive strength average amounted to 34.295 Mpa, 36.731 MPa, 41.881
MPa, 42.767 MPa and 46.947 MPa. Where the maximum compressive strength of the concrete
obtained with the addition of volcanic ash of 20% and a minimum compressive strength of the
concrete obtained with the addition of volcanic ash at 0% (No Addition).
Keywords: Chemical Ingredients, Concrete Compressive Strength, Volcanic Ash Kelud