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Helmy Akbar Bale
Program Studi Teknik Sipil, Universitas Islam Indonesia, Yogyakarta, Indonesia

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PERILAKU LENTUR PERBAIKAN BALOK BETON BERTULANG DENGAN VARIASI LEBAR CARBON FIBRE REINFORCED POLYMER Atika Ulfah Jamal; Helmy Akbar Bale; Iqbal Haqiqi
TEKNISIA Vol. XX, No. 2, November 2015
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Abstract

The retrofitting of reinforced concrete structural elements required in case of material degradation which results in decreased strength, stiffness, stability and resistance to environmental conditions. One material that can be used to retrofit concrete structures is the Carbon Fibre Reinforced Polymer (CFRP). Experimental research must be done toward the influence of CFRP width variations to retrofit reinforced concrete beam flexural capacity after damage. The specimen used for this research is a beam with 15x20x120 cm3 dimension. There were three beams used and divided into two groups, Control Beam (BK) and Carbon Beam (BC). These three beams were given a load until the first crack then had to retrofit with CFRP, and was given a load again upon the beams finally fallout and  the result of maximal load that able to be supported by the beam is obtained.  The research result shows that there is the significant increase in the beam flexural strength. The wider CFRP used for retrofitting, the greater beam flexural capacity increases. CFRP uses as retrofitting material in the beam bending area also able to prevent a new crack in the bending area.
PENGARUH VARIASI LEBAR CFRP PADA BAGIAN TARIK TERHADAP DAKTILITAS BALOK BETON BERTULANG PASKA PERBAIKAN Atika Ulfah Jamal; Novi Rahmayanti; Helmy Akbar Bale; Iqbal Haqiqi
TEKNISIA Vol. XXI, No. 1, Mei 2016
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Abstract

Retrofitting should be done on reinforced concrete beams were damaged the structure, it is to restore or improve the strength and ductility. One of the innovations of materials that can be used for retrofitting is Carbon Fiber Reinforced Polymer (CFRP). The width of the CFRP used for retrofitting an effect on load and deflection occurs in the beam, it will also affect the ductility of the beam. In this study examined the influence of the width of CFRP for retrofitting to the ductility of reinforced concrete beams with dimensions of 15x20x120 cm3. The beam is loaded until cracking occurred. Retrofitting performed on beams that have been fractured by adding CFRP on the tensile reinforcement of reinforced concrete beams. The wide variationCFRP is used to repair the beam, which is 5 cm, 10 cm, and 15 cm. The results showed that the width of CFRP placed on the tensile reinforcement in reinforced concrete beam elements repair after damage affects the curvature ductility. The wider the CFRP used for the retrofit of reinforced concrete beams lead to the greater percentage decrease in ductility curvature.
PEMANFAATAN BATU ZEOLITE SEBAGAI AGREGAT KASAR PADA CAMPURAN ASPHALT CONCRETE BINDER COURSE (AC-BC) DENGAN BAHAN IKAT ASPAL PERTAMINA PEN 60/70 DAN STARBIT E-60 Subarkah Subarkah; Helmy Akbar Bale; Adyatma Arif Nugraha
TEKNISIA Vol. XXV, No. 1, Mei 2020
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol25.iss1.art6

Abstract

In the construction project, especially the roads in Yogyakarta and surrounding areas, the aggregate used is derived from the Clereng Kulonprogo. This amount of aggregate usage results in scarcity and affects the price to become expensive. The use of coarse aggregate materials as an alternative is rare. In reality, it is necessary to make innovation by utilizing the coarse aggregate of zeolite stone, which is still quite widely available in the Klaten area. Based on the preliminary test, the zeolite aggregate has a lower abrasion resistance compared to the andesite aggregate from Clereng. Using a modified asphalt Starbit E-60, which has a deficient penetration value, is expected to provide better stability to compensate for the weakness of zeolite stones. A combination of a mixture between a coarse aggregate of zeolite Stones and Andesite is tested until how large the proportion of zeolite stones of such combinations can provide the optimum value to AC-BC layer pavement. This research compares the performance of the AC-BC mixture using zeolite and andesite stones. It determines the feasibility of zeolite's stone, in substituting the andesite stone, in the AC-BC mixture. It is also to know the influence of the use of Starbit E-60 in the AC-BC mixture. The comparison of those performances was referred to as Marshall characteristics, Indirect Tensile Strength (ITS), and Immersion; using Pen asphalt Pen. 60/70 and Starbit E-60 as a binder. Trial mix was applied to the bitumen content variation of 5%, 5.5%, 6%, 6.5%, to determine Optimum Bitumen Content (OBC) by conducting Marshall testing. The variety of substitution zeolite proportions of 0%, 25%, and 75% was made in each trial mix above. The research result showed that the maximum percentage of zeolite aggregate in the mixture using an asphalt Pen 60/70, which meets with specification standard, is 28%, while the mixture using Starbit E-60 is 26%. ITS value decreases as the percentage of zeolite are increased. ITS value of mix with Starbit E-60 is higher than that of mix with asphalt Pen 60/70. Cantabro Loss value increases with zeolite proportion increase, for both mixed with Starbit E-60 and asphalt Pen 60/70. Cantabro loss of mix with Starbit E-60 is lower than that of with asphalt Pen 60/70. IRS value decrease with an increasing proportion of zeolite.