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Soebandono, Bagus
Universitas Muhammadiyah Yogyakarta
Engineering

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Pengaruh Campuran Abu Sekam Padi terhadap Kuat Tekan Paving Block Waluyo, Budi; Pujianto, Asat; Soebandono, Bagus
Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013
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Rice husk is an abundant by-product of rice milling results, and so far only used as a fuel for combustion red stones, burning for cooking or thrown away. Rice husk ash (RHA) is a waste material of rice that has special properties. This material also contains chemical compounds that can be pozzolan, which contains silica (SiO2), a compound which, when mixed with cement and water can be used to enhance the compressive strength and tensile strength of concrete while silica is a chemical compound that is dominant in the rice husk ash. This study aimed to compare the results of the average compressive strength of the normal paving block with the added ingredient of rice husk ash, assess the effect of the addition of rice husk ash to the compressive strength and prices comparison between the paving block and normal paving block with the added ingredient of rice husk ash. In this study, rice husk ash serves as a replacement for cement additives with a variation of 0%, 30%, 35% and 40% by weight of cement in comparison 1pc: 10ps, 1pc: 13ps and 1pc: 15ps. The results showed that the paving blocks with a mixture of rice husk ash in comparison 1pc: 10ps produce optimum compressive strength with a mixture of rice husk ash 16.6% in the amount of 32.709 MPa. Furthermore in comparison 1pc: 13ps, paving block compressive strength values obtained with the optimal mix of rice husk ash rice 13.0% amounting to 23.709 MPa. Finally, in comparison 1pc: 15ps, paving block compressive strength values obtained with the optimal mix of rice husk ash 15.0% amounting to 17.260 MPa.
Pemanfaatan Fly Ash dan Alkali Resistant Glass Fibre (ARG) dalam Pembuatan Paving Block Soebandono, Bagus
Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013
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The paving block is an alternative to the use of pavement layer that is safe, strong and easy to installation and maintenance. Pavement paving block also can be produced both mechanically and manually. The added fly ash was a waste material from coal combustion in the steam power plant furnace in the form of fine, round, pozzolanic and fibre-resistant. Alkali Resistant Glass Fibre (ARG) which is shaped like a rope 18-36 mm long was added into the paving block with mixed compositions 1 Pc:10 Ps that aims to strengthen the compressive strength and flexibility of the paving block. This research was used 15 samples with mixture variation of fly ash 19% and fiber 0,25%, 0,5%, 0,75% and 1%. Based on the results of laboratory analysis, paving block (1 Pc: 10 Ps) with the addition of fly ash 19% and ARG 0.6% yielding a maximum compressive strength of 18.35 MPa. The addition of fibres with fly ash mixture was also able to increase the compressive strength of the paving block.
Pengaruh Faktor Air Semen terhadap Kuat Tekan Beton dengan Agregat Batu Apung Pujiono, Agus; Riyanto, Dwi; Pujianto, Asat; Soebandono, Bagus
Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013
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Lightweight concrete is concrete that has a unit weight less than 1800 kg/m3. Pumice can be used to make lightweight concrete as the replacement of coarse aggregate in concrete mixtures. This research aimed to discover the compressive strength of lightweight concrete with water-cement ratio and the impact of the unit weight of the concrete. This research was divided into two types of method. Firstly, the concrete was produced with the water-cement ratio of 0.30, 0.32, 0.34, and 0.36 and additional superplasticiser 2% for each variation. Secondly, the concrete was created with water-cement ratio 0.36, 0.38, 0.40 and 0.42 without admixture. Samples were tested for compressive strength after 28 days and calculated the unit weight of the concrete with pumice as the replacement of coarse aggregate. The results of this study indicated that for the first method, the maximum compressive strength value of lightweight concrete with pumice and additional superplasticiser was 11.2880 MPa with water-cement factor 0.30 and unit weight 1691.59 kg/m3. While for the second experiment, results show that the maximum compressive strength of lightweight concrete with pumice without admixture reached at 10.4620 MPa with a water-cement ratio at 0.38 and unit weight 1692.74 kg/m3.
Co-Authors Pujianto, Asat Pujiono, Agus Riyanto, Dwi Susanti, Aris Taufiq Ilham Maulana Waluyo, Budi