Analisis Kinerja Beton Agregat Daur Ulang dengan Penambahan Fly Ash pada Iklim Tropis: Studi Kasus di Lombok Timur

Abstract

Abstract

Sustainability issues in the construction sector encourage the use of alternative materials such as fly ash and recycled aggregates to reduce dependence on natural resources and reduce carbon emissions. However, studies on the synergy of the two materials in concrete systems in tropical climate conditions are still minimal, especially in areas such as East Lombok. This study aims to evaluate the effect of variations in fly ash content on the compressive strength of recycled concrete in the context of humid tropical climates. The study employed a laboratory experimental approach with four variations in fly ash content (0%, 10%, 20%, and 30% by weight of cement) and compressive strength testing at 7, 14, and 28 days of age. A total of 60 cylindrical test objects were printed and tested according to SNI standards, then statistically analyzed using one-way ANOVA. This test aims to determine the significance of differences between treatments, which is then complemented by a post hoc test to identify significant groups. The results showed that the addition of fly ash at a 20% level resulted in the most optimal increase in compressive strength, with an increase of approximately 12% compared to the controls. The primary conclusion of this study is that a 20% fly ash composition can significantly enhance the performance of recycled concrete in tropical climatic conditions. This research makes a significant contribution to the development of environmentally friendly concrete standards, informed by local data and insights. It can serve as a reference in the preparation of technical regulations for sustainable development in tropical regions.

Abstrak

Isu keberlanjutan dalam sektor konstruksi mendorong eksplorasi material alternatif yang lebih ramah lingkungan, seperti fly ash dan agregat daur ulang, untuk mengurangi ketergantungan pada sumber daya alam dan emisi karbon. Namun, kajian eksperimental mengenai sinergi kedua material dalam sistem beton di iklim tropis lembap masih sangat terbatas, khususnya di wilayah seperti Lombok Timur. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi kadar fly ash terhadap kuat tekan beton agregat daur ulang dalam konteks iklim tropis. Studi dilakukan dengan metode eksperimen laboratorium menggunakan empat variasi kadar fly ash (0%, 10%, 20%, dan 30% dari berat semen) serta pengujian kuat tekan pada umur 7, 14, dan 28 hari. Total 60 benda uji silinder diuji berdasarkan standar SNI, dan data dianalisis menggunakan ANOVA satu arah untuk mengetahui signifikansi pengaruh perlakuan. Uji lanjutan Tukey HSD digunakan untuk mengidentifikasi kelompok yang berbeda secara nyata. Hasil menunjukkan bahwa penambahan fly ash sebesar 20% menghasilkan peningkatan kuat tekan paling optimal (±12%) dibandingkan beton kontrol. Temuan ini menunjukkan bahwa kombinasi fly ash dan agregat daur ulang mampu meningkatkan performa beton secara signifikan di bawah kondisi iklim tropis lembap. Penelitian ini memberikan kontribusi penting bagi pengembangan standar teknis beton ramah lingkungan berbasis data lokal, dan dapat dijadikan referensi dalam perumusan kebijakan pembangunan berkelanjutan di wilayah tropis berkembang