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Abstract
Abstract Researches about lightweight concrete that be held nowadays, have some weakness particularly in compressive strength. Usually researches about lightweight concrete with pumice that uses Portland giving result about 13,5-16,8 MPa of compressive strength. For reducing the cement using, it is needed to find an alternative of Portland cement exchanged that improve the compressive strength at once. In addition, for compressive strength increasing it is needed to use water low water stirring. But, with a low water stirring, so mixing will be difficult for doing so it is needed superplastizer for mixing easier. Fly ash varieties as an exchanged of a part of Portland cement start from 0%, 10%, 20%, 30%, 40%. The weight ratio of cement : sand : pumice is 1,00 : 3,07 : 1,14 with factor adhesive water 0,32 refers SNI 03-3449-2002 with compressive strength of the plan is 18 MPa. This study uses superplasticizer 0,4% and 0,8% of cement weight is added during the mixing concrete. Distribution of sand and pumice designed by SNI 03-2834-2000, zone 1 for sand and graduation maximum diameter of 12,5 for pumice. Increase compressive strength and modulus of elasticity occurred with age concrete hydration of 28 days to 56 days. Compressive strength increase with fly ash varieties as an exchanged of a part of Portland cement with fly ash until 20% and then decreasing. However, the replacement of Portland cement 40% with fly ash was produced higher compressive strength than without fly ash. A relatively same indicator be shown on modulus of elasticity that be carried out from changing of 20% Portland cement by fly ash and 40% superplasticizer consecutively as 14,34 MPa and 10766,71 MPa in 28 days and 18,12 MPa and 11006,56 MPa in 56 days.
Highlights
Researches about lightweight concrete that be held nowadays, have some weakness in compressive strength
Fly ash varieties as an exchanged of a part of Portland cement start from 0%, 10%, 20%, 30%, 40%
Increase compressive strength and modulus of elasticity occurred with age concrete hydration of 28 days to 56 days
Summary
DAN SUPERPLASTICIZER I Gusti Agung Neny Purnawirati, I M. Abstrak Penelitian mengenai beton ringan dengan batu apung yang selama ini dilakukan, masih memiliki kekurangan terutama pada kuat tekan. Penggantian semen dengan abu terbang mulai dari 0%, 10%, 20%, 30% dan 40%. Penelitian ini menggunakan superplasticizer sebesar 0,4% dan 0,8% dari berat semen yang ditambahkan pada saat pengadukan beton. Peningkatan kuat tekan dan modulus elastisitas terjadi seiring dengan bertambahnya umur hidrasi beton dari 28 hari ke 56 hari. Kuat tekan meningkat dengan bertambahnya penggantian semen Portland dengan abu terbang sampai dengan 20% dan selanjutnya menurun. Nilai kuat tekan dan modulus elastisitas maksimal dihasilkan pada penggantian 20% semen Portland dengan abu terbang dan 0,4% superplasticizer berturut-turut sebesar 14,34 MPa dan 10766,71 MPa pada umur 28 hari dan 18,12 MPa dan 11006,56 MPa pada umur 56 hari. Kata kunci : abu terbang, batu apung, beton ringan, kuat tekan, modulus elastisitas. MECHANICAL PROPERTY OF LIGHTWEIGHT CONCRETE USING PUMICE AS A COARSE AGGREGATE, FLY ASH AS A SUBSTITUTION OF A PART OF PORTLAND
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