Mechanical Test of Mortar with Addition of Fly Ash Using Seawater Immersion

Muh. Sayfullah. S; Muhammad Abdu; Arjun Arjun

doi:10.59261/jequi.v8i5.474

Authors

Muh. Sayfullah. S Universitas Muhammadiyah Buton, Indonesia
Muhammad Abdu Universitas Muhammadiyah Buton, Indonesia
Arjun Arjun Universitas Muhammadiyah Buton, Indonesia

DOI:

https://doi.org/10.59261/jequi.v8i5.474

Keywords:

Compressive Strength, Curing, Fly Ash, Mortar, Seawater

Abstract

Background: The rapid pace of infrastructure development has increased the demand for more environmentally friendly cement-based binders. One potential approach is the use of fly ash as a supplementary cementitious material in mortar.

Objective: To determine the compressive strength of mortar and evaluate the effects of fly ash replacement at proportions of 0%, 5%, 10%, and 15% by weight of cement, using two curing media: seawater and freshwater.

Method: This study employed a quantitative experimental approach involving laboratory testing to evaluate the effects of varying fly ash replacement proportions on the compressive strength and water absorption of mortar specimens cured in two different media.

Results: The compressive strength of mortar increased with increasing fly ash content and curing age in both curing media. The highest value was obtained with 15% fly ash replacement after 28 days of freshwater curing, reaching 31.53 kN, whereas seawater curing under the same conditions yielded 22.90 kN. Freshwater curing consistently resulted in higher compressive strength than seawater curing across all fly ash replacement proportions. Conversely, the 28-day water absorption test showed that specimens cured in seawater exhibited relatively higher water absorption than those cured in freshwater.

Conclusion: Chloride, calcium, magnesium, and sulfate ions in seawater may influence cement hydration. These effects may accelerate early-age strength development but may also increase porosity and compromise long-term durability. These findings provide preliminary insights into the potential benefits and limitations of using seawater as a curing medium for mortar.

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References

Astuti, A. W., Fathias, E., Purwanto, P., & ... (2013). Studi Eksperimental Aplikasi Material Nano Fly Ash Terhadap Kuat Tekan Mortar Beton. Jurnal Karya Teknik ….

Badan Standardisasi Nasional. (2000). SNI 03-2834-2000: Tata Cara Pembuatan Rencana Campuran Beton Normal. Jakarta: BSN.

Badan Standardisasi Nasional. (2002). SNI 03-6825-2002: Metode Pengujian Kekuatan Tekan Mortar Semen Portland untuk Pekerjaan Sipil. Jakarta: BSN.

Badan Standardisasi Nasional. (2008). SNI 1972:2008: Cara Uji Slump Beton. Jakarta: BSN.

Dasar, A., & Patah, D. (2024). Kekuatan dan Durabilitas Beton Menggunakan Palm Oil Fuel Ash (POFA) dan Pasir Pantai. Borneo Engineering : Jurnal Teknik Sipil, 8(1), 83–94. https://doi.org/10.35334/be.v8i1.5090

Dirgantara, F. Y. D. (2025). Pengaruh rendaman air payau terhadap kuat tekan pada beton campuran fly ash. Universitas Islam Sultan Agung.

Donatello, S., Palomo, A., & Fernández-Jiménez, A. (2013). Durability of very high volume fly ash cement pastes and mortars in aggressive solutions. Cement and Concrete Composites, 38. https://doi.org/10.1016/j.cemconcomp.2013.03.001

Farina, I., Moccia, I., Salzano, C., Singh, N., Sadrolodabaee, P., & Colangelo, F. (2022). Compressive and Thermal Properties of Non-Structural Lightweight Concrete Containing Industrial Byproduct Aggregates. Materials, 15(11). https://doi.org/10.3390/ma15114029

Hardjito, D. (2014). Abu Terbang Solusi Pencemaran Semen. Igarss 2014, (1).

Hwang, S., & Yeon, J. (2022). Fly Ash-Added, Seawater-Mixed Pervious Concrete: Compressive Strength, Permeability, and Phosphorus Removal. Materials, 15(4), 1407. https://doi.org/10.3390/ma15041407

Irawan, D., Niken, C., Zaenudin, A., & Helmi, M. (2023). Pengaruh Perendaman Air Laut Terhadap Kuat Tekan dan Permeabilitas Beton. Jurnal Rekayasa Sipil Dan Desain, 11(4). https://doi.org/10.23960/jrsdd.v11i4.3840

Janowska-Renkas, E., & Kaliciak, A. (2021). Impact of Fly Ashes from Combustion in Fluidized Bed Boilers and Siliceous Fly Ashes on Durability of Mortars Exposed to Seawater and Carbonation Process. Materials, 14(9), 2345. https://doi.org/10.3390/ma14092345

Li, P., Li, W., Sun, Z., Shen, L., & Sheng, D. (2021). Development of sustainable concrete incorporating seawater: A critical review on cement hydration, microstructure and mechanical strength. Cement and Concrete Composites, 121. https://doi.org/10.1016/j.cemconcomp.2021.104100

Lim, E. D., Roxas, C. L., Gallardo, R., Nishida, T., & Otsuki, N. (2015). Strength and corrosion behavior of mortar mixed and/or cured with seawater with various fly ash replacement ratios. Asian Journal of Civil Engineering, 16(6).

Nana Patria, A. S., & Haikal, F. (2022). Pengaruh Kadar Fly Ash Terhadap Kuat Tekan Beton Mutu Tinggi Menggunakan Admixture High Range Water Reducer. Jurnal Teknik Sipil, 15(2), 12–22. https://doi.org/10.56444/jts.v15i2.210

Nurtanto, D., Rahayu, A. A., & Wahyuningtyas, W. T. (2021). Pengaruh Perawatan Air Laut dan Air Tawar terhadap Kuat Tekan Beton Geopolymer yang Memadat Sendiri. Rekayasa, 14(1), 32–38. https://doi.org/10.21107/rekayasa.v14i1.8375

Pang, K., & Liu, L. (2026). Compressive Strength of Alkali-Activated Slag-Fly Ash Mortar Under Low Temperature Curing: An ANN and SHAP Analysis. In RILEM Bookseries (Vol. 73). https://doi.org/10.1007/978-3-032-30128-4_59

Peneliti DLSU Research Congress. (2013). Corrosion behavior of steel embedded in fly ash mortar mixed with seawater. Presented at Research Congress 2013, De La Salle University, Manila.

Priastiwi, ST. MT. , Y. A., Wibowo, H., Puwanto, P., Hidayat, A., Ulayya, I., & Carita, N. (2024). The influence of Sea Water on Compressive Strength, Permeability, and Geopolymer Concrete Microstructure with Fly ash and White Soil as a Substitute for Cement. MEDIA KOMUNIKASI TEKNIK SIPIL, 30(1), 65–74. https://doi.org/10.14710/mkts.v30i1.63604

Riyana, H., & Walujodjati, E. (2022). Pengaruh Substitusi Sebagian Agregat Halus dengan Abu Limbah Kulit Sapi Terhadap Kuat Tekan Beton. Jurnal Konstruksi, 20(2). https://doi.org/10.33364/konstruksi/v.20-2.1210

Studi Biomass Fly Ash pada Mortar dengan Curing Air Laut. (2024). Feasibility study of biomass fly ash as a partial cement replacement in mortar cured in seawater. Borneo Engineering: Jurnal Teknik Sipil.

Studi Drying Shrinkage Mortar Fly Ash dengan Air Laut. (2015). Drying shrinkage of fly ash mortar mixed with seawater. Applied Mechanics and Materials, 802, 118–123.

Siba, M. M., Sina, D. A., & Rizal, H. A. H. (2023). Pengaruh Waktu Perendaman Air Laut Terhadap Kuat Tekan Beton Menggunakan Semen Kupang dengan Bahan Tambah Fly Ash. JURNAL FORUM TEKNIK SIPIL (J-ForTekS), 3(1), 19–23. https://doi.org/10.35508/forteks.v3i1.7150

Sultan, M. A., Hakim, R., & Kurniawan, K. (2023). Efek Larutan Asam Terhadap Kuat Tekan dan Penyerapan Mortar dengan Bahan Tambah Fly Ash. Rekayasa Sipil, 17(2). https://doi.org/10.21776/ub.rekayasasipil.2023.017.02.5v

Wenno, R., Wallah, S. E., & Pandaleke, R. (2014). Kuat Tekan Mortar Dengan Menggunakan Abu Terbang (Fly Ash) Asal Pltu Amurang Sebagai Substitusi Parsial Semen. Jurnal Sipil Statik, 2(5).

Yahya, Z., Abdullah, M. M. A. B., Li, L., Burduhos Nergis, D. D., Hakimi, M. A. A. Z., Sandu, A. V., Vizureanu, P., & Razak, R. A. (2021). Behavior of Alkali-Activated Fly Ash through Underwater Placement. Materials, 14(22), 6865. https://doi.org/10.3390/ma14226865

Zahlim, A., Bachtiar, E., & Makbul, R. (2022). Efek Curing Air Laut Terhadap Kuat Tekan Beton Mutu Tinggi Yang Menggunakan Fly Ash Sebagai Subtitusi Pasir. Borneo Engineering : Jurnal Teknik Sipil, 1(1). https://doi.org/10.35334/be.v1i1.2161

Zhang, J., Ma, Y., Zhang, Z., Yang, X., Nong, X., & Wang, H. (2024). Effects of Mg-based admixtures on chloride diffusion in alkali-activated fly ash-slag mortars. Case Studies in Construction Materials, 21, e03659. https://doi.org/10.1016/j.cscm.2024.e03659