Pengaruh Rasio Air–Pengikat terhadap Waktu Pengikatan dan Kuat Tekan Pasta Geopolimer
DOI:
https://doi.org/10.52722/kad1vv33Kata Kunci:
Abu terbang, Kapur padam, Aktivator Alkali, Geopolimer, Kuat tekanAbstrak
Penelitian ini bertujuan untuk mengevaluasi pengaruh rasio air terhadap bahan pengikat terhadap waktu pengikatan dan kuat tekan pasta geopolimer berbasis abu terbang tipe F dari PLTU Mpanau, Palu, dengan penambahan kapur padam (Ca(OH)₂) sebesar 10% dari berat bahan dasar. Aktivator yang digunakan terdiri dari sodium silikat dan sodium hidroksida, serta air murni tanpa kandungan mineral. Variasi dosis Na₂O yang digunakan adalah 6%, 8%, dan 10%, dengan rasio air terhadap bahan pengikat bervariasi dari 0,24 hingga 0,42. Benda uji berbentuk silinder berdiameter 2,5 cm dan tinggi 5 cm, dengan pengujian kuat tekan dilakukan pada umur 3, 7, 14, dan 28 hari. Hasil menunjukkan bahwa setiap dosis Na₂O memiliki rentang rasio air terhadap bahan pengikat tertentu yang menghasilkan waktu pengikatan ideal. Dosis Na₂O 10% menunjukkan rasio optimal antara 0,26 – 0,34, sedangkan pada dosis 8% optimum terjadi pada rasio 0,42, dan pada dosis 6% berada pada kisaran 0,38 – 0,40. Kuat tekan tertinggi sebesar 22,68 MPa diperoleh pada dosis Na₂O 10% dengan rasio air terhadap bahan pengikat sebesar 0,28 pada umur 28 hari.Unduhan
Referensi
[1] Schneider, M., Romer, M., Tschudin, M., & Bolio, H. Sustainable cement production—present and future. Cement and Concrete Research, 41(7), 642–650, 2011.
[2] Provis, J., & Deventer, J. Alkali Activated Materials: State-of-the-Art Report, RILEM TC 224-AAM, 2014.
[3] PT PLN (Persero). Rencana Umum Penyediaan Tenaga Listrik (RUPTL) 2021–2030, 2021.
[4] Pilehvar, S., Cao, V. D., Szczotok, A. M., Valentini, L., Salvioni, D., Magistri, M., Pamies, R., & Kjøniksen, A.-L. Mechanical properties and microscale changes of geopolymer concrete and Portland cement concrete containing micro-encapsulated phase change materials. Cement and Concrete Research, 100, 341–349, 2017.
[5] Hui-Teng, N., Yong, H., Ming, L., & Abdullah, M. M. A. B. The effect of various molarities of NaOH solution on fly ash geopolymer paste. In AIP Conference Proceedings (Vol. 2045), 2018.
[6] Nath, P., & Sarker, P. K. Flexural strength and elastic modulus of ambient-cured blended low-calcium fly ash geopolymer concrete. Construction and Building Materials, 130, 22–31, 2017.
[7] Ourgessa, A., Tasew, A., & Hafa, R. The Effect of Alkaline Concentration and Curing Temperature on the Durability of Fly Ash Geopolymer Mortar. Advanced Materials Research, 1172, 95–107, 2022.
[8] Alhawat, M., Ashour, A., Yildirim, G., Aldemir, A., & Sahmaran, M. Properties of geopolymers sourced from construction and demolition waste: A review. Journal of Building Engineering, 50, 104104, 2022.
[9] International, A., & ASTM C311 / C311M-23. Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portland-Cement Concrete, 2023.
[10] Adam, A. Strength and durability properties of alkali activated slag and fly ash-based geopolymer concrete. August, 2009.
[11] ASTM C191-19. Standard Test Methods for Time of Setting of Hydraulic Cement by Vicat Needle, 2019.
[12] ASTM C109 / C109M. The standard’s title, such as “Standard Test Method for Compressive Strength of Hydraulic Cement Mortars.” ASTM International, 2016.
[13] Walkley, B., & Provis, J. Solid-state nuclear magnetic resonance spectroscopy of cements. Materials Today Advances, 1, 100007, 2019.
[14] Zhang, Y. Determinants of Construction Productivity." Journal of Construction Engineering, 147(8), 04, 2021.
[15] Jawahar, J., & Mounika, G. STRENGTH PROPERTIES OF FLY ASH AND GGBS BASED GEO POLYMER CONCRETE. Asian Journal of Civil Engineering, 17, 127–135, 2016.
[16] Khalifa, A. Z., Cizer, Ö., Pontikes, Y., Heath, A., Patureau, P., Bernal, S. A., & Marsh, A. T. M. Advances in alkali-activation of clay minerals. Cement and Concrete Research, 132, 106050, 2020.
[17] Castillo, H., Collado, H., Droguett, T., Sánchez, S., Vesely, M., Garrido, P., & Palma, S. Factors Affecting the Compressive Strength of Geopolymers: A Review. Minerals, 11, 1317, 2021.
[18] Tu, W., & Zhang, M. Behaviour of alkali-activated concrete at elevated temperatures: A critical review. Cement and Concrete Composites, 138, 104961, 2023.
[19] Behfarnia, K., & Rostami, M. An assessment on parameters affecting the carbonation of alkali-activated slag concrete. Journal of Cleaner Production, 157, 2017.
Journal Template
