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All Journal J-Sil (Jurnal Teknik Sipil dan Lingkungan) Science and Technology Indonesia Syntax Literate: Jurnal Ilmiah Indonesia Jurnal Infrastruktur CSID Journal of Infrastructure Development (CSID-JID) Construction and Material Journal Makara Journal of Technology J-Sil (Jurnal Teknik Sipil dan Lingkungan) CSID Journal of Infrastructure Development Jurnal Sipakatau
Handika, Nuraziz
Department Of Civil And Environmental Engineering, Faculty Of Engineering, Universitas Indonesia
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Journal : csid journal of infrastructure development

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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
Publisher : UI Scholars Hub

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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
Experimental Studies of Compressive Strength of Sustainable Concrete with Partial Cement Substitution Using Palm Oil Boiler Ash Suraedi, Daral; Sjah, Jessica; Handika, Nuraziz; Aulia, Saffanah Fasya; Edwardo, Karmenita Olivia
CSID Journal of Infrastructure Development
Publisher : UI Scholars Hub

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This study investigates the mechanical performance of sustainable concrete incorporating Palm Oil Boiler Ash (POBA) as a partial cement replacement. As the construction sector seeks to reduce CO₂ emissions and manage agro-industrial waste, POBA emerges as a promising supplementary cementitious material due to its pozzolanic potential and abundance in palm oil–producing regions such as Indonesia.Concrete specimens were prepared with POBA substitution levels ranging from approximately 10% to 30% by weight of cement, in combination with nanosilica and a polycarboxylate ether (PCE) superplasticizer to enhance performance. The mix design was developed in accordance with ACI 211 guidelines to maintain comparable workability across all mixtures.Compressive strength was evaluated at 3, 14, 28, and 56 days. Results indicate that while early-age strength decreases with increasing POBA content, an optimal replacement level of 19% demonstrated compressive strength comparable to the control mixture at later ages under the tested mix design conditions. The inclusion of nanosilica, based on prior experimental validation, is considered to have contributed to mitigating early strength reduction and supporting microstructural development. The study concludes that POBA, when applied at an optimal replacement level, can serve as a viable partial cement substitute for structural concrete applications, supporting environmental sustainability and low-carbon infrastructure development.
Co-Authors Ahmad Ashari Arijoeni, Essy Arijoeni, Essy Aulia, Saffanah Fasya Bastian Okto Bangkit Sentosa Dahlan, Astryd Viandila Daral Suraedi Dewanti, Dian Purwita Edwardo, Karmenita Olivia Elfiranahla Chandra Dewi Elly Tjahjono, Elly Ferdinand, Joshua Gasti, Muhammad Daffa Hafiyya Izzah Aini Halim Muhammad Rifki Idhar, Ridha Amalia Jonbi Krisdiansyah, Gilang Mutiara, Ayudia Norita, Balqis Fara Norita, Balqis Fara Oktoria Masniari Pratiwi, Siva Yuniar Rahmatika, Iftita Rendy Thamrin Shinta Fatina Elba Simanihuruk, Bertinus Sjah, Jessica Sotya Astutiningsih Taufik Tjahjono, Elly Tri Eddy Susanto