DESKRIPSI TUGAS AKHIR :
STABILISASI TANAH LEMPUNG DENGAN MENGGUNAKAN LIMBAH SAMPEL UJI KUAT TEKAN BETON DAN PENGARUHNYA TERHADAP NILAI DAYA DUKUNG TANAH
Abstrak (Abstracts)
Clayey soil exhibits shrink-swell behavior and low bearing capacity. The production of concrete generates waste in the form of concrete compressive strength test samples, which have a negative impact on the environment. This study aims to utilize concrete compressive strength test samples as a soil stabilization material to enhance the bearing capacity of clayey soil and reduce environmental impact. The research objective is to evaluate the influence of concrete waste on the bearing capacity of clayey soil through unsoaked California Bearing Ratio (CBR) testing. The research methodology employed an experimental approach. The testing included measuring the moisture content, conducting sieve analysis, determining the Atterberg limits, measuring the bulk density and unit weight, and performing lightweight soil compaction tests. The obtained data were used to classify the soil types according to the Unified Soil Classification System (USCS). Subsequently, laboratory unsoaked CBR testing was conducted on the natural soil samples and on samples mixed with varying proportions of concrete waste (5%, 10%, 15%, 20%, and 25%). Based on the laboratory testing and analysis of the natural soil and soil mixed with concrete compressive strength test samples, it was found that the CBR value of the natural soil around the Civil Engineering Workshop of Poltekba in North Balikpapan, East Kalimantan, was 10.78%. The CBR testing results showed that the addition of concrete waste in proportions of 5%, 10%, 15%, 20%, and 25% resulted in successive increases in CBR values to 13.48%, 15.75%, 18.88%, 22.69%, and 26.87%, respectively. Therefore, it can be concluded that the utilization of concrete compressive strength test samples can enhance the bearing capacity of clayey soil. This research contributes to the development of effective and environmentally-friendly soil stabilization technology. Tanah lempung memiliki kembang susut dan daya dukung rendah. Pembuatan beton menghasilkan limbah berupa sampel uji kuat tekan beton yang berdampak negatif pada lingkungan. Penelitian ini bertujuan menggunakan limbah sampel uji kuat tekan beton sebagai bahan stabilisasi tanah lempung, meningkatkan daya dukung tanah dan mengurangi dampak lingkungan. Tujuan penelitian ini adalah mengevaluasi pengaruh limbah beton terhadap daya dukung tanah lempung melalui pengujian CBR unsoaked. Metodologi penelitian yang digunakan adalah jenis penelitian eksperimental. Pengujian dilakukan terhadap tanah asli dengan mengukur kadar air, melakukan analisa saringan, menguji atterberg limit, mengukur berat jenis, dan berat volume. Data hasil pengujian akan digunakan untuk mengklasifikasikan jenis tanah menggunakan metode USCS. Selanjutnya, dilakukan pengujian pemadatan tanah ringan untuk mendapatkan nilai kadar air optimum dan berat isi kering maksimum. Data ini akan digunakan dalam pengujian CBR Laboratorium unsoaked pada tanah asli serta pengujian CBR Laboratorium unsoaked dengan campuran limbah beton dalam variasi 5%, 10%, 15%, 20%, dan 25%. Berdasarkan hasil pengujian laboratorium dan analisis data tanah asli serta tanah yang dicampur dengan limbah sampel uji kuat tekan beton, ditemukan bahwa nilai CBR pada tanah asli di sekitar workshop Teknik Sipil Poltekba di Balikpapan Utara, Kalimantan Timur adalah 10,78%. Hasil pengujian CBR menunjukkan bahwa penambahan limbah beton sebesar 5%, 10%, 15%, 20%, dan 25% menghasilkan peningkatan nilai CBR secara berturut-turut menjadi 13,48%, 15,75%, 18,88%, 22,69%, dan 26,87%. Dengan demikian, dapat disimpulkan bahwa penggunaan limbah sampel uji kuat tekan beton dapat meningkatkan daya dukung tanah lempung. Penelitian ini memberikan kontribusi dalam pengembangan teknologi stabilisasi tanah yang efektif dan ramah lingkungan.Keyword : Clayey soil, Concrete waste, Soil stabilization, Unsoaked CBR