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All Journal Jurnal Ilmiah Desain & Konstruksi ENGINEERING U Karst Jurnal Riset Rekayasa Sipil Jurnal Manajemen Teknologi dan Teknik Sipil (JURMATEKS) Community Development Journal: Jurnal Pengabdian Masyarakat Journal Innovation of Civil Engineering (JICE) Engineering and Technology International Journal (EATIJ) Journal of Civil Engineering and Vocational Education Proceeding of The International Conferences on Engineering Sciences
Imam Mustofa
Civil Engineering, Universitas Kadiri, Kediri, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Mechanical Engineering Public Health Transportation

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Journal : U Karst

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Consistency of Compressive Strength in Concrete with 10% Rice Husk Ash Substitution Alfaridh Pasya, Salman; Bima Mahardana, Zendy; Mustofa, Imam; Iwan Candra, Agata
UKaRsT Vol. 9 No. 1 (2025): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v9i1.6583

Abstract

Using rice husk ash (RHA) in concrete technology represents a significant innovation in promoting sustainability. The pozzolanic properties of RHA enhance concrete quality through microstructural refinement while mitigating environmental impacts. However, replacing 10% of cement with RHA has inconsistent effects on compressive strength. Such variability may limit the broader application of RHA in structural concrete due to uncertainties in performance prediction, quality assurance, and design safety. While some studies report strength improvements, others note reductions often attributed to limited samples size, material inconsistencies, and variations in mixing or curing processes. This study aims to statistically validate the consistency of compressive strength in concrete with 10% RHA substitution by increasing the sample size and controlling key variables. Nine specimens per test condition were evaluated using a water-cement ratio of 0.53, submersion curing and ASTM C39 testing standards. Compressive strength assessment was conducted at 7 days. The result show a 7.54% increase in compressive strength, from 22.71 MPa to 24.42 MPa, with a coefficient of variation (CV) of 2.26%, well below the 10% threshold. In contrast, earlier studies with smaller sample sizes reported CVs as high as 42.65%, indicating greater statistical variability. This improvement is attributed to the increased sample size, material quality control, and uniform mixing, which ensured homogeneous RHA distribution and optimized pozzolanic reactions. By applying a controlled-variable approach and increasing the sample size, this study addresses prior inconsistencies and reinforces the validity of RHA as a viable cement substitute in concrete.
Statistical Validation of 2% Lignosulfonate as a Sustainable Stabilizer for Expansive Clay Rivianto, Arif; Candra, Agata Iwan; Nursandah, Fauzie; Mustofa, Imam
UKaRsT Vol. 9 No. 1 (2025): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v9i1.6594

Abstract

Expansive clay soils undergo volumetric changes due to fluctuations in moisture content, which can cause structural damage to foundations, pavements, and embankments. Traditional stabilization methods, such as cement and lime, are effective but have a significant environmental impact, highlighting the need for more environmentally friendly alternatives. Lignosulfonate (LS), an organic stabilizer derived from industrial by-products, offers a more sustainable approach to improving soil strength and stability. This study evaluates the effect of 2% lignosulfonate on the unconfined compressive strength (UCS) of expansive clays. The research method involved mixing LS at 2% of the dry weight of the soil into the expansive clay (CL-ML) and conducting UCS tests on three untreated (control) samples and six treated samples. Statistical analysis was used to assess the significance of the differences between the two groups. Results show that the UCS increased from 236.29 kPa in the control group to 291.49 kPa in the treated group, reflecting a 23.37% improvement. Poisson's ratio decreased from 0.300 to 0.200, indicating reduced lateral deformation and enhanced soil stiffness, which improves the bearing capacity and stability of structures built on it. The UCS values ​​were observed to be consistent supported by low standard deviation. The study highlights the critical role of adequate sample replication and control over operational variables such as moisture content, compaction, and LS dispersion to ensure reliable and reproducible stabilization outcomes. This study strengthens the empirical basis for the application of LS as a sustainable and environmentally friendly stabilizer for expansive clays.
Co-Authors Abdul Rosid Ma'ruf Achmad Fikri Haikal Achmad Khabib Kurnia Achmad Saiful Arifin Agata Iwan Candra Ahmad Ridwan Alfaridh Pasya, Salman Andri Dwi Cahyono Aprillinda, Ismatul Putri Arifin, Achmad Saiful Ashabul Yamin Audy Yoga Pratama Bima Mahardana, Zendy Chaq, Uluumul Dwi Nur Khayatin Edy Gardjito, Edy Eka Nurul Qomaliyah Erwin Dwi Laksana Evita Fitrianis Hidiyati Faiz Muhamad azhari Faiz Muhammad Azhari Faiz Muhammad Azhari Fatima, Brenda Fitry Rahmawaty Heru Setiyo Cahyono Ines Indria Wati Ita Suhermin Ingsih Karyadi Karyadi Muhammad Heri Nastotok Muhdhor, Muhammad Ali Nindyawati Nindyawati Nursandah, Fauzie Pratama, Satrya Adi Purwanto, Zahra Putri, Karisma Rahmahima, Bella Amiria Ramadhani, Fadlila Ayub Rendy Kurnia Dewanta Ricco Dwi Yuliawan Rivianto, Arif Saefudin, Ruli Salsabila, Fitri Amalia Setyoningrum, Tyas Dwi Sigit Winarto Sigit Winarto Sony Susanto Suwarno Suwarno Tantra Tegar Permady Wicaksono, Daniel Jalu Aufarel Wiwit Mely Yanti Jannah