Garuda - Garba Rujukan Digital

Experimental Studies on the Homogeneity and Compressive Strength Prediction of Recycled Aggregate Concrete (RAC) Using Ultrasonic Pulse Velocity (UPV) Handika, Nuraziz; Norita, Balqis Fara; Tjahjono, Elly; Arijoeni, Essy
CSID Journal of Infrastructure Development Vol 3, No 2 (2020)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32783/csid-jid.v3i2.111

The reuse of material from collapsed building debris as a natural aggregate substituent has been an alternative to solve concrete waste in Indonesia. However, its use in larger structures needs further research. The objectives of this research are to study the concrete homogeneity at a certain sample height and to find the strength prediction of Recycled Aggregate Concrete (RAC). In the previous laboratory study, the obtained concrete compressive strength with 20% RAC substitution (from the concrete ruins with fc’ = 30 MPa) was 27-30 MPa. Since, RAC contains natural aggregates and mixed cement paste, it is important to research the distribution, homogeneity and strength prediction of the concrete. The measurement was done using a non-destructive instrument called Ultrasonic Pulse Velocity (UPV). This paper presents a series of experiments investigating homogeneity and predicting compressive strength using both Destructive and Non-Destructive Tests (NDT). To do so, three steps in the experimental works were done. Firstly, UPV propagation measurements at four different levels through vertical prismatic beam specimens was performed. Two transducers were used in the direct mode of transmission with a 15 cm distance of measurement. Secondly, identical concrete samples cast in cubic form were measured using UPV and tested under compression. Thirdly, the core-drilled samples were taken from the vertical prismatic beam specimens for further investigation. The wave propagation velocity through RAC and the concrete compressive strength relationship demonstrate similar pattern as concrete with GFC (Gypsum-free-cement) performed by Brozovsky. This pulse velocity-concrete strength relationship can be used to predict the strength of RAC. Both the prediction curve and the homogeneity properties can be useful when casting a larger element of structures using RAC.

Influence of the Shaping Process on the Tensile Properties of Steel Reinforcement Bars Carbon Steel Grades BJTP24 and BJTS40 Handika, Nuraziz; Idhar, Ridha Amalia; Sjah, Jessica; Arijoeni, Essy; Tjahjono, Elly
Makara Journal of Technology Vol. 24, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

According to the current applicable national standard in Indonesia, i.e. SNI 07 2529 1991, in addition to the limitation on the loading rate, the steel bar must be reduced, formed, or lathed, as part of the shaping process of samples. This study determined and compared the effect of the shaping process on the yield strength, ultimate strength, and percent elongation by conducting tensile tests of steel bar grade BJTS40, i.e. deformed bar type of steel, and grade BJTP24, i.e., plain bar type of steel. Three diameters of the deformed bar (BJTS40) and one diameter of the plain bar (BJTP24) were used. Samples of the bars were taken randomly from a local distributor in the Greater Jakarta area. Each 1 m of the bar is divided into two, i.e. one end being the non-shaped sample and the other end being the shaped sample. Tensile tests of these two sides were conducted. This study determined that the shaping process influences the results of the tensile test, particularly the variation of percent elongation. Moreover, the effects of the shaping process can be inferred from the high coefficients of variation of yield strength (4.33%) and ultimate strength (2.40%) of the shaped sample. The results of this study, which elucidate the effects of the shaping process on tensile tests, can be used as an information resource in engineering practice.

Crack Propagation Observation Using Digital Image Correlation (DIC) on Oil Palm Shell (OPS) Reinforced Concrete Beam Handika, Nuraziz; Astutiningsih, Sotya; Sentosa, Bastian Okto Bangkit; Gasti, Muhammad Daffa
Jurnal Teknik Sipil dan Lingkungan Vol. 9 No. 1: April 2024
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University and The Institut of ENgineering Indonesia (PII), Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.9.1.1-10

In terms of disaster risk management, crack opening and behaviour of structural elements should be predicted to prevent severe risk after the failure. To do so, structure responses, and crack propagation phenomena of concrete structural elements should be understood. Opening, re-closing, or re-opening of cracks in concrete may occur under some circumstances. Capturing the behaviour along the test, sometimes, becomes a problem. Measurement tools should be detached to prevent damage as the sample reaches failure point. A set of contactless devices, called Digital Image Correlation (DIC), has been developed in the Laboratory of Structural and Material Universitas Indonesia. In this research, experimental on Oil Palm Shell (OPS) concrete beam with 19 MPa of fc’, was conducted under four-point loading in the laboratory. OPS is a solid by-product obtained from palm oil production. This experiment uses a 300 x 15 x 250 cm3 beam under a semi-cyclic loading protocol. Load vs deflection, strain, and cracking behaviour are obtained by using the DIC system as its equipment. The conventional measurement (dial gauge) results were compared to the DIC results. The measurement from both tools has similar values. Also, this DIC system can capture deflection and measure crack opening evolution along the test.

PEMANFAATAN BOTTOM ASH PEMBAKARAN PLTSA SEBAGAI SUBSITUSI PASIR PENYUSUN PAVING BLOCK Krisdiansyah, Gilang; Simanihuruk, Bertinus; Handika, Nuraziz; Dewanti, Dian Purwita; Mutiara, Ayudia
Construction and Material Journal Vol. 6 No. 1 (2024): Construction and Material Journal Vol. 6 No. 1 Maret 2024
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v6i1.6089

Waste management in Indonesia poses a significant challenge, and to address this issue, the government has established waste-to-energy plants (Pembangkit Listrik Tenaga Sampah - PLTSa) in Bantar Gebang that generate bottom ash waste. This study focuses on utilizing bottom ash as a substitute for fine aggregate in the production of concrete paving blocks. The research aims to analyze the compressive strength, abrasion, and absorption properties of the paving blocks with various mixtures of bottom ash (0%, 10%, 30%, 50%, 60%, 80%, and 100%) at a curing age of 28 days. The results indicate that the use of bottom ash as a substitute for fine aggregate increases the compressive strength of the paving blocks. The mixture with 100% bottom ash exhibits the highest compressive strength due to the high content of calcium oxide and silicon dioxide, similar to cement content. However, the replacement of up to 50% of fine aggregate with bottom ash leads to an increase in abrasion values, indicating reduced abrasion resistance. On the other hand, paving mixtures containing 60% to 100% bottom ash show improved abrasion resistance compared to lower percentages. Absorption tests reveal that mixtures containing 10% to 100% bottom ash exhibit higher absorption values compared to the control sample without bottom ash, attributed to the high absorption capacity of bottom ash compared to sand. In conclusion, this study highlights that bottom ash from PLTSa can be effectively used as a substitute material in the production of paving blocks, leading to enhanced compressive strength and abrasion resistance. However, careful consideration of the percentage of substitution is essential to ensure compliance with the quality standards. This innovative approach has the potential to contribute to the reduction of negative impacts from PLTSa waste and offer a sustainable solution to waste management in Indonesia, promoting environmental conservation and improving infrastructure quality in the long run.

Crack Propagation Observation Using Digital Image Correlation (DIC) on Oil Palm Shell (OPS) Reinforced Concrete Beam Handika, Nuraziz; Astutiningsih, Sotya; Sentosa, Bastian Okto Bangkit; Gasti, Muhammad Daffa
Jurnal Teknik Sipil dan Lingkungan Vol. 9 No. 1: April 2024
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.9.1.1-10

In terms of disaster risk management, crack opening and behaviour of structural elements should be predicted to prevent severe risk after the failure. To do so, structure responses, and crack propagation phenomena of concrete structural elements should be understood. Opening, re-closing, or re-opening of cracks in concrete may occur under some circumstances. Capturing the behaviour along the test, sometimes, becomes a problem. Measurement tools should be detached to prevent damage as the sample reaches failure point. A set of contactless devices, called Digital Image Correlation (DIC), has been developed in the Laboratory of Structural and Material Universitas Indonesia. In this research, experimental on Oil Palm Shell (OPS) concrete beam with 19 MPa of fc’, was conducted under four-point loading in the laboratory. OPS is a solid by-product obtained from palm oil production. This experiment uses a 300 x 15 x 250 cm3 beam under a semi-cyclic loading protocol. Load vs deflection, strain, and cracking behaviour are obtained by using the DIC system as its equipment. The conventional measurement (dial gauge) results were compared to the DIC results. The measurement from both tools has similar values. Also, this DIC system can capture deflection and measure crack opening evolution along the test.

Sustainable Cement Development Using Palm Oil Boiler Ash: Mechanical and Microstructural Evaluation Suraedi, Daral; Sjah, Jessica; Handika, Nuraziz; Jonbi; Ashari, Ahmad
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1188-1197

The cement industry significantly contributes to CO2 emissions, releasing approximately 1 ton of CO2 for every ton of cement produced, which accounts for up to 40% of total global industrial emissions. This study aims to mitigate these emissions by utilizing Palm Oil Boiler Ash (POBA) as a clinker substitute, creating POBA Cement with substitution levels ranging from 10% to 30%. The POBA was sourced from the Cikasungka Palm Oil Plantation in Bogor, Indonesia and underwent analysis using X Ray Fluorescence (XRF) andScanningElectron Microscopy (SEM) to assess its chemical properties and microstructure. The findings revealed a decrease in compressive strength with increased POBA substitution levels; however, it maintained a pozzolanic effect that supported the crystallization process, albeit with a longer setting time compared to Ordinary Portland Cement (OPC). Notably, the addition of 1% nano-silica was found to enhance compressive strength more effectively than 3%. This research underscores the potential of POBA as an environmentally friendly clinker substitute for sustainable cement production.

Title

Found 6 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 6 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 6 Documents
Search