Perbandingan Metode Pencampuran Dan Bentuk Spesimen Siltstone Yang Distabilisasi Pada Pengujian Durabilitas Statis
DOI:
https://doi.org/10.18196/bce.v5i1.22430Keywords:
siltstone, cement stabilitation, slake index, dry mix, spray mixAbstract
Banyak konstruksi berada diatas batuan sedimen siliklastik seperti siltstone. Siltstone mudah mengalami pelapukan karena iklim. Tanah sebagai dasar dari bangunan harus mempunyai ketahan jangka panjang dalam menerima beban. Siltstone yang mengalami siklus pembasahan – pengeringan mudah lapuk dan menurun daya dukung dan durabilitasnya. Rendahnya durabilitas siltstone yang telah lapuk dapat diperbaiki dengan stabilisasi secara kimia menggunakan semen. Penelitian ini bertujuan untuk menganalisis pengaruh stabilisasi semen terhadap tanah siltstone melalui metode pengujian degradasi yang dinamakan static slake index test. Pengujian ini menggunakan dua metode pencampuran semen yaitu pencampuran kering (dry mixed) dan pencampuran basah (spray mixed). Kadar semen yang digunakan 10% yang dibandingkan dengan spesimen tanpa stabilisasi. Spesimen pada pengujian ini dibuat dengan dua variasi yaitu bentuk tidak beraturan menyerupai fragmen alami dan bentuk silinder berukuran diameter 3,5 mm dan tinggi 3,5 mm. Kedua jenis specimen mempunyai berat masing-masing antara 40g–60g. Hasil pengujian menunjukkan bahwa penambahan semen 10% mampu menurunkan tingkat pelapukan pada siltstone sebesar 70%-80%. Degradasi spesimen setelah pengujian pada metode pencampuran kering dan bentuk silinder lebih tinggi dibandingkan metode basah dan bentuk fragmen.
Many constructions are on siliciclastic sedimentary rocks such as siltstone. Siltstone is subject to weathering due to climate. As the base of a building, soil must have long-term durability when accepting loads. Siltstone subjected to wetting-drying cycles is easily weathered, decreasing its bearing capacity and durability. The low durability of weathered siltstone can be improved by chemical stabilization using cement. This study aims to analyze the effect of cement stabilization on siltstone soil through a static slaking method called static slake index test. This test uses two cement mixing methods: dry and spray mixed. The cement content used was 10%, compared to unstabilized specimens. The specimens in this test were made with two variations: irregular shapes resembling natural fragments and cylindrical shapes measuring 3.5 mm in diameter and 3.5 mm in height. Both types of specimens weighed between 40g-60g each. The test results showed that adding cement decreased siltstone's weathering rate. The degradation of specimens after testing in the dry mixing method and cylindrical is higher than that in the wet and fragment shape processes.
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