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Desi Sandy

Fakultas Teknik Sipil Universitas Kristen Indonesia Paulus

Author-ID : 5374962

Civil Engineering, Building, Construction & Architecture Transportation

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Pemanfaatan Bottom Ash Sebagai Bahan Substitusi Agregat Halus Terhadap Kekuatan Beton Agnes Claudia Posedung; Frans Phengkarsa; Desi Sandy
Paulus Civil Engineering Journal Vol 2 No 3 (2020): Volume 2, No.3, September 2020
Publisher : Program Studi Teknik Sipil UKI Paulus-Makassar

Bottom ash is the result of coal combustion which can be useful for the use of concrete mix constituents. In this study, bottom ash is used as a substitute for fine aggregate in the manufacture of concrete. Bottom ash has a larger and heavier grain size with a characteristic dark gray color. The purpose of this study was to determine the strength of concrete using bottom ash as a substitute for fine aggregate. The percentage of the use of bottom ash as a substitute for fine aggregate is 0%, 25%, and 35%. The research was conducted at the Laboratory of Material Technology, Paulus University of Indonesia Christianity. The test objects used were 36 cylinders with a diameter of 15 cm and a height of 30 cm. Tests conducted in the form of compressive strength test, split tensile strength test, and modulus of elasticity test with a concrete quality plan of 30 MPa. From the research results, for the compressive strength test results obtained the optimum bottom ash variation at the use of 35% bottom ash with a compressive strength of 33,764 MPa at the age of 28 days, the split tensile strength test obtained the optimum variety of bottom ash at the use of bottom ash 35% with split tensile strength. of 3,253 MPa at the age of 28 days while the highest modulus of elasticity was obtained at the addition of 35% bottom ash which was 27332.0255 Mpa. And the percentage of split tensile strength relationship for bottom ash variation is 0%, 25%, and 35% of 8.007%, 8.983%, and 9.635% of the compressive strength, respectively. This value meets or is by following per under with what is determined, namely the average ranges from 7% to 11% of the compressive strength with an average of around 9%. From the variation of bottom ash, namely 0%, 25%, and 35% in cylindrical specimens, which reaches f'c 30 Mpa is bottom ash with a variation of 35% and can be used as a substitute for fine aggregate.

Pengaruh Fly Ash Dan Bottom Ash Sebagai Bahan Substitusi Pada Beton Marlyana Antika Pagau; Jonie Tanijaya; Desi Sandy
Paulus Civil Engineering Journal Vol 2 No 4 (2020): Volume.2 No.4, Desember 2020
Publisher : Program Studi Teknik Sipil UKI Paulus-Makassar

Generally, factory waste cannot be disposed of directly because it can pollute the environment. In the city of Makassar, South Sulawesi, to be precise at PT. Makassar Tene uses coal as factory fuel, where the rest of the coal combustion produces fly ash and bottom ash waste which requires processing before disposal. This study aims to determine the value of compressive strength, split tensile strength and flexural strength of concrete and to determine the effect of the percentage of fly ash and bottom ash substitution in the concrete mixture. This research was conducted using the American Concrete Institute (ACI) method with a design quality of 23 MPa. Based on this research, it can be seen that the concrete mixture with fly ash and bottom ash substitution causes the concrete to experience a decrease in strength as the percentage of bottom ash substitution increases.

Penggunaan Agregat Kasar Batu Gunung Salubue Terhadap Beton Mutu Tinggi Deo Saldi Tanga; Frans Phengkarsa; Desi Sandy
Paulus Civil Engineering Journal Vol 3 No 1 (2021): Volume 3, No.1, Maret 2021
Publisher : Program Studi Teknik Sipil UKI Paulus-Makassar

Aims of this study is to determine the characteristics and high quality concrete of coarse aggregate originating from Mount Salubue. The test uses a cylindrical specimen with a height of 30 cm with a diameter of 15 cm and a beam of 60 x 15 x 15 cm, on the mechanical properties of the concrete. The number of specimens is 20 cylindrical specimens and 4 beam specimens. The design of the composition of the constituent materials of concrete uses the SNI 03-2834-2000 method. The results showed that the relationship between compressive strength and split tensile strength is 7.323% to the compressive strength value, and the relationship between compressive strength and flexural strength is 11.104% to the compressive strength value. The characteristics of the coarse aggregate of Mount Salubue meet the SNI standards as a concrete mixture and meets the compressive strength of the plan.

Sifat Mekanik Beton Mutu Tinggi Dengan Kombinasi Slag Nikel Dan Slag Baja Yoel Lian Tiranda; Herman Parung; Desi Sandy
Paulus Civil Engineering Journal Vol 3 No 1 (2021): Volume 3, No.1, Maret 2021
Publisher : Program Studi Teknik Sipil UKI Paulus-Makassar

This study is intended to determine the composition of the concrete mixture, the strength of the concrete and the ratio of the strength of the concrete with the combination of nickel slag and steel slag as a substitute for fine aggregate and coarse aggregate. The percentage of use of nickel slag waste of 50% as a substitute for fine aggregate and steel slag waste varies from 0%, 15%, and 30% as a substitute for coarse aggregate in high quality concrete mixtures (f'c = 42 MPa). In this study, the mix design uses the SNI 03-2834-200 method. The specimens used were 36 cylinders with a diameter of 15 centimeters and a height of 30 centimeters and 9 beams with a size of 15x15x60. Tests made in 7 days, 21 days, and 28 days age variations. Based on the mechanical properties of the average concrete using steel slag waste as a substitution at 30% variation, the greatest results were 45.27 MPa, 4.91 MPa and 5.09 MPa respectively for compressive strength, split tensile strength and concrete flexural strength.

Pemanfaatan Abu Sekam Padi Sebagai Substitusi Semen Pada Bata Ringan Noprian; Herman Parung; Desi Sandy
Paulus Civil Engineering Journal Vol 3 No 4 (2021): Volume 3 No.4 Desember 2021
Publisher : Program Studi Teknik Sipil UKI Paulus-Makassar

Utilization of rice husk ash as a cement substitute for lightweight bricks is intended to reduce the use of cement as well as an alternative way of managing waste and is expected to have a positive impact on the environment. This study aims to determine the magnitude of the effect of rice husk ash substitution with variations of 0%, 12%, 15%, 17% and 20% and 40% foam agent on the compressive strength, specific gravity and absorption of lightweight bricks. The lightweight brick test includes testing for compressive strength, specific gravity and absorption with 45 specimens measuring 23 x 11 x 5.5 cm and carried out at the Laboratory of Materials and Concrete Structures Technology majoring in Civil Engineering, Indonesian Christian University Paulus Makassar. The results of the specific gravity test of rice husk ash variations 0%, 12%, 15%, 17% and 20% respectively 1451.67 kg/m3, 1358.2465 kg/m3, 1300.7546 kg/m3, 1281.5906 kg /m3 and 1207.3302 kg/m3 and the results of the compressive strength test at 28 consecutive days were 1.9104 MPa, 1.6469 MPa, 1.2516 MPa, 1.2516 MPa and 0.7906 Mpa, as well as the results of the water absorption test respectively 18,8625%, 20,6042%, 25,8885%, 30,0007%, 31, 9233%. The effect of rice husk ash as a substitute for cement can increase water absorption and reduce the compressive strength and specific gravity of lightweight bricks.

Co-Authors Agnes Claudia Posedung Deo Saldi Tanga Frans Phengkarsa Jonie Tanijaya Marlyana Antika Pagau Noprian Parung, Herman Yoel Lian Tiranda

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