BIANKALISTA, INTAN SALMA (2025) OPTIMASI PROPORSI FLY ASH DAN GGBS DALAM PAVING BLOCK TERHADAP KUAT TEKAN DAN KUAT LENTUR. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
The increasing demand for environmentally friendly infrastructure has encouraged innovations in construction materials that can reduce carbon emissions. One such effort involves utilizing industrial waste such as fly ash and Ground Granulated Blast Furnace Slag (GGBS) as partial replacements for cement in the production of paving blocks. This study aims to examine the effect of various proportions of fly ash and GGBS on the compressive and flexural strength of paving blocks and to determine the optimal mixture proportion that meets structural strength standards for road pavement, particularly in heavy vehicle parking areas. The research method involved four mixture variations of fly ash and GGBS in a 1:1 ratio, namely 0%, 7.5%, 15%, and 25% of the cement weight. Compressive strength tests were conducted at the ages of 7, 14, and 28 days, while the flexural strength test was performed at 28 days. The test results showed that the mixture containing 85% cement, 7.5% fly ash, and 7.5% GGBS produced the highest compressive and flexural strength values, reaching 21.5 MPa and 4.5 MPa, respectively. These values meet the requirements for Class A paving blocks based on SNI 03-0691-1996, making them suitable for road pavements and heavy traffic parking areas. These findings demonstrate that using an appropriate amount of fly ash and GGBS can improve the mechanical performance of paving blocks while also reducing cement usage and carbon emissions. Therefore, this study contributes to the development of more sustainable and environmentally friendly construction materials. Keywords : paving block, fly ash, GGBS, compressive strength, flexural strength, sustainable construction. Peningkatan kebutuhan infrastruktur yang ramah lingkungan mendorong inovasi material konstruksi yang dapat mengurangi dampak emisi karbon. Salah satu upaya yang dilakukan adalah memanfaatkan limbah industri seperti fly ash dan Ground Granulated Blast Furnace Slag (GGBS) sebagai substitusi sebagian semen dalam pembuatan paving block. Penelitian ini bertujuan untuk mengetahui pengaruh variasi campuran fly ash dan GGBS terhadap kuat tekan dan kuat lentur paving block, serta menentukan proporsi campuran paling optimal yang sesuai dengan standar kekuatan struktural untuk perkerasan jalan, khususnya pada area parkir kendaraan berat. Metode penelitian dilakukan dengan menggunakan empat variasi campuran fly ash dan GGBS dalam skala 1:1, yaitu 0%, 7,5%, 15%, dan 25% dari berat semen. Uji kuat tekan dilakukan pada umur 7, 14, dan 28 hari, sedangkan uji kuat lentur dilakukan pada umur 28 hari. Hasil pengujian menunjukkan bahwa variasi campuran dengan 85% semen, 7,5% fly ash, dan 7,5% GGBS menghasilkan nilai kuat tekan dan kuat lentur tertinggi, yaitu sebesar 21,5 MPa dan 4,5 MPa. Nilai ini memenuhi persyaratan mutu A sesuai SNI 03-0691-1996, sehingga paving block tersebut layak digunakan untuk area parkir kendaraan berat. Temuan ini menunjukkan bahwa penggunaan fly ash dan GGBS dalam jumlah yang tepat tidak hanya dapat meningkatkan performa mekanik paving block, tetapi juga berkontribusi pada pengurangan penggunaan semen dan emisi karbon. Dengan demikian, penelitian ini memberikan kontribusi dalam pengembangan material konstruksi yang lebih berkelanjutan dan ramah lingkungan. Kata kunci : paving block, fly ash, GGBS, kuat tekan, kuat lentur, konstruksi berkelanjutan.
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