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Syamsul Bahri
Politeknik Negeri Lhokseumawe
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Pengaruh Penggunaan Ternary Blend Fly Ash Dengan Volume Tinggi dan Abu Sekam Padi Terhadap Kuat Tekan Beton Mutu Tinggi Sofa Rizki; Syamsul Bahri; Sulaiman Sulaiman; Hanif Hanif; Aiyub Aiyub; Cut Yusnar
Jurnal Teknologi Vol 21, No 2 (2021): Oktober 2021
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (127.509 KB) | DOI: 10.30811/teknologi.v21i2.2433

Abstract

This study aims to find the effect of ternary blended: cement, fly ash (FA), and rice husk ash (ASP) on the compressive strength of high-strength concrete.  The composition of FA and ASP used for cement replacement were 0%, 10% ASP, 30% FA, 10% ASP+30% FA, 10% ASP+40% FA, and 10% ASP+50% FA.  The water-cement factor (FAS) and binder used are 0.3 and 500 kg/m3 fresh concrete, respectively.  The specimens used for compressive strength is cubes of 100×100×100 mm with tests at the age of 1, 3, 7, 28, and 56 days.  The results showed that the use of 10% ASP increased the compressive strength of the concrete compared to the control concrete but required more superplasticizers.  The use of 30% FA as a cement substitute showed a decrease in compressive strength compared to control concrete but reduced the use of superplasticizer.  The use of a combination of FA and ASP as a substitute for cement showed a decrease in compressive strength under control concrete and concrete using 30% FA.  The decrease in the compressive strength of concrete with the combination of ASP and FA is beyond the initial expectation.  This may be due to the disproportionate use of FA compared to ASP so that the reaction that occurs is not optimal to form calcium silicate hydrate (CSH).  However, the use of ternary blended cement, FA, and ASP still has added values which is better workability than without using FA.
Evaluasi Mikrostruktur dan Sifat Mekanik Mortar PCC yang Mengandung Abu Sekam Padi dengan Berbagai Jenis Perawatan Syamsul Bahri; Alpin Maulidin; Naifah Naifah; Zulfikar Zulfikar; Iskandar Iskandar
Jurnal Teknologi Vol 26, No 2 (2026): Agustus 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i2.9617

Abstract

The utilization of Rice Husk Ash (RHA) as a supplementary cementitious material (SCM) in Portland Composite Cement (PCC) mortar offers a sustainable approach to reducing cement consumption, mitigating CO₂ emissions, and valorizing agricultural waste. However, the effectiveness of RHA is influenced by the curing regime, which governs hydration and pozzolanic reactions, thereby affecting the microstructure and mechanical performance of mortar. This study investigates the influence of RHA substitution and curing methods on the mechanical properties and microstructure of PCC mortar. Mortar specimens were prepared with RHA replacement levels of 0%, 10%, and 20% by weight of cement and cured under water curing and air curing conditions. Fresh mortar workability, compressive strength, flexural strength, and microstructural characteristics were evaluated using Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The results indicate that increasing RHA content reduced mortar workability; therefore, superplasticizer dosages of 1.0% and 1.5% were incorporated to maintain adequate consistency. At 28 days, 10% RHA under air curing reduced compressive strength by approximately 2% relative to the control mixture, whereas 20% RHA reduced it by 20%. In contrast, water curing with 10% RHA enhanced compressive strength by approximately 2%, while 20% RHA showed no improvement over the control. Flexural strength decreased under both curing regimes as the RHA replacement level increased. SEM and FTIR results indicated that water curing promoted a denser microstructure and increased hydration product formation at 10% RHA replacement, leading to improved mechanical properties relative to specimens subjected to air curing
Co-Authors Aiyub Aiyub Alpin Maulidin Cut Yusnar Hanif Iskandar Iskandar Naifah Naifah Sofa Rizki Sulaiman Sulaiman Zulfikar Zulfikar