STUDI UJI KUAT TEKAN DAN SERAPAN AIR PADA BATA BETON BERLUBANG DENGAN BAHAN IKAT KAPUR DAN FLY ASH

Abstract

Along with population growth from year to year increase in positive correlation with housing needs. Various innovative building materials necessary to provide the public an opportunity to select materials according to their needs and abilities. One of the innovations that can be developed is the use of hollow concrete bricks as building material for walls using a different belt materials. In Indonesia, many local materials that can be used as building material for the mixed stacking hollow concrete blocks strapped him in particular materials. One of the alternative tie material can be used to reduce pamakaian Portland cement is fly ash. Innovations that can be done is making concrete hollow brick with limestone belt materials and fly ash, because the material can theoretically be bound material using the reaction mechanism pozolan-lime. Mixture composition variation between the fly ash, lime, and sand as the material collated hollow concrete blocks used in this study, respectively - are part (in weight units) 0:1:6; 0,5:1:6; 1:1:6 ; 1,3:1:6; 1,4:1:6; 1,5:1:6; 1,6:1:6; and 1,8:1:6. The parameters examined in this study include stacking the material characteristics of concrete hollow bricks, the sand gradation testing, the weight of sand, mud, sand content, conservation of sand grains, and the gradation of fly ash; strong press penyususun concrete brick mortar holes; strong press and the value of water absorption hollow concrete brick with limestone belt materials and fly ash. Hollow concrete brick testing performed three times, ie at the age of 14 days, 21 days, and 28 days. From the research results collated material characteristics of concrete hollow bricks show that gradations of sand used in Badean in zone 1, ie coarse sand, the average density - average 2.567 for Badean sand, mud content of the average - Badean sand flat 2.08% for <5% ,, conservation of grain using Na2SO4 for 5.03% <12% and conservation of grains using MgSO4 for 6.30% <10%. From the findings of conventional hollow concrete blocks with a mixture of composition 1 PC: 15 Ps for a strong test of hollow concrete brick press shows that a strong press for the optimum of 12.69 kg/cm2. And to strongly press the test hole with concrete blocks tied materials and lime fly ash showed that a strong press and the optimum occurs at the composition 1.4 Fa: 1 Kp: 6 Psr, which is 11.54 kg/cm2 at 14 days; 12.44 kg / cm2 at the age of 21 days, and 13.33 kg/cm2 at the age of 28 days. For the water absorption value of hollow concrete blocks shows that more and more pasta, then the value of water absorption decreased. Largest water absorption occurs in the variation of composition 0 Fa: 1 Kp: 6 Psr ie 5.13%, and the value of the smallest water absorption occurs at 1.8 composition variations Fa: 1 Kp: 6 Psr ie 0.05%.