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All Journal International Journal of Civil Engineering and Infrastructure (IJCEI)
Sempurna Bangun
Tama Jagakarsa University
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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EFFECT OF THE USE OF WOOD CHARCOAL ASH ON THE COMPRESSIVE STRENGTH OF NORMAL CONCRETE Martin Richardo William; Kristina Sembiring; Sempurna Bangun; Pio Ranap Tua Naibaho
International Journal of Civil Engineering and Infrastructure Vol. 3 No. 2 (2023): IJCEI Volume 3 No. 2
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/ijcei.3.2.32-39

Abstract

Wood charcoal ash is the result of chemical changes from the burning of wood. Wood charcoal contains silica which is a good binder aggregate for concrete mixtures, it is the same as the function of cement in a concrete mixture. Wood charcoal can also be used as a mixture or addition to the manufacture of reactive concrete. Concrete is a mixture of portland cement, fine aggregate, coarse aggregate and water, with or without additives that form a solid mass. Concrete is prepared from coarse aggregate and fine aggregate. Cement and water interact chemically to bind the aggregate particles into a solid mass (George Winter, 1993). Based on the results of research that has been done, the results obtained on normal concrete of 17.98 Mpa at the age of 7 days and increased at the age of 14 days of 20.73 Mpa, and 28 days of 22.94 Mpa. At the time of normal concrete mixed with wood charcoal ash 3% compressive strength of concrete again increased by 20.43 Mpa at the age of 7 days, but at the age of 14 days of concrete with a mixture of wood charcoal ash increased by 20.82 Mpa and again increased at the age of 28 days by 27.07 Mpa. The decrease continued to occur in concrete with a mixture of wood charcoal ash 8% and 13% at the age of 7 Days, 14 days, and 28 days, the increase in the compressive strength of the optimal concrete is in the concrete mixture of wood charcoal ash 3% at the age of 28 days.
RELATIONSHIP BETWEEN 35 MEGAPASCAL COMPRESSIVE STRENGTH AND FLEXURAL STRENGTH Oki Permana; Pio Ranap Tua Naibaho; Sempurna Bangun
International Journal of Civil Engineering and Infrastructure Vol. 3 No. 2 (2023): IJCEI Volume 3 No. 2
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/ijcei.3.2.59-68

Abstract

In the modern era like now in the construction sector, there are so many innovations in infrastructure along with the times. Concrete is an important factor in the construction sector with a function as one of the formers of the upper and lower structures. Concrete material is the result of a mixture of cement, coarse aggregate, fine aggregate, water and sometimes added materials with various kinds of innovations. The method used in this study is experimental, by making the test specimen laboratory samples by using two different specimens but with the same quality of concrete is fc'35 MPa. Based on the results of the values on the flexural and compressive test specimens in the laboratory, an unsuitable relationship between flexural strength (has been obtained fs) and compressive strength (fc ') according to SNI 2847: 2013. On formulas (fr = 0.62 √fc′) applis to the concrete test 28 day.
ANALYSIS OF THE STRUCTURAL PERFORMANCE OF THE UPPER STRUCTURE OF THE JAGAKARSA JAKARTA SELF-APARTMENT BUILDING USING ETABS SOFTWARE WITH PUSHOVER ANALYSIS METHOD Jujun Junaedi Hidayat; Sempurna Bangun; Kristina Sembiring; Pio Ranap Tua Naibaho
International Journal of Civil Engineering and Infrastructure Vol. 5 No. 2 (2025): IJCEI Volume 5 No. 2
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/ijcei.5.2.10-19

Abstract

An earthquake is a natural disaster event that causes seismic waves and vibrations or shocks due to a sudden release of energy under the earth's surface. Earthquakes are caused by collisions or frictions between tectonic plates (earth plates) or the collapse of gaps in the sea. In this study, it is specialized to evaluate the performance of the upper structure by adopting a plan on the existing building structure (existing condition) in accordance with the change in the field due to differences, changes in field conditions and will carry out a non-linear static analysis in the form of pushover analysis using the ATC-40 method with a building that functions as a flat. The results of the pushover analysis in the Rusun Jagakarsa building by modeling using the ETABS application obtained a greater value from the base shear in the y direction compared to the base shear in the x direction. The capacity curve in the x-direction stopped at step 9 with a value from the Base Shear of 48.654,4992 KN, the capacity curve in the direction of y stopped at step 3 withand a Base Shear value of 29.656,6413 KN. The level of performance of the structure was measured based on the calculation of the maximum parameter of total drift and the maximum parameter of inelastic drift of the direction x of 0.00803 < 0.01 value is included in Damage Control (DC). For the maximum parameter value of the total drift resulting from the calculation of pushover in the direction y is 0.00741 < 0.01, based on these results it is included in the category of Immediate Occupancy (IO). Then for the maximum parameter value of inelastic drift as a result of the calculation of Pushover in the direction of y is 0.00745 > 0.005, this value is included in the category of Damage Control (DC).Keywords: Earthquake, pushover, ETABS
ANALYSIS OF COLUMN AND SLAB BEHAVIOR DUE TO ELEVATION DIFFERENCE ON SLOPING GROUND Dominikus Ola Ama; Sempurna Bangun; Kristina Sembiring; Pio Ranap Tua Naibaho
International Journal of Civil Engineering and Infrastructure Vol. 5 No. 2 (2025): IJCEI Volume 5 No. 2
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/ijcei.5.2.20-30

Abstract

The construction of the I-Smart Building is planned on a site with steep slope topography, with an elevation difference of approximately 8 meters between the front side (+110.000) and the rear side (+102.000), resulting in a slope gradient of about 4.7%. During the construction phase, the zero elevation of the I-Smart Building had to be adjusted to match that of the previously constructed Technopole building, necessitating soil excavation of up to ±5 meters. This adjustment significantly impacted the structural design, particularly due to the variation in column heights, which led to the short column effect. Short columns are known to experience greater shear forces and bending moments due to concentrated lateral loads, while carrying smaller axial loads compared to taller columns. The analysis showed that short columns received approximately 53% higher shear forces and 83% higher bending moments, but carried only half the axial load of tall columns. Nevertheless, all column types satisfied the requirements for cross-sectional capacity, internal forces, and reinforcement needs. Additionally, the difference in column heights affected the distribution of lateral loads on the floor slabs. However, theoretical calculations and structural analysis indicated that the floor slabs were capable of resisting the resulting internal forces, with reinforcement meeting the requirements of SNI 2847-2019. Overall, both the column structures and floor slabs were deemed safe and met design criteria.Keywords: Short Column, Sloped Terrain, Slab, Sloping
Co-Authors Dominikus Ola Ama Jujun Junaedi Hidayat Kristina Sembiring Martin Richardo William Oki Permana Pio Ranap Tua Naibaho