Stabilisasi Tanah Ekspansif Menggunakan Kapur Dan Spent Catalyst Untuk Tanah Dasar Perkerasan

Abstract

Expansive soils have high swelling and shrinkage potentials, which may cause damage to road structures. Therefore, stabilization is required. One method of stabilization is to use lime and spent catalysts with the aim of increasing carrying capacity and reducing swelling. Spent catalyst is a petroleum processing waste and classified as pozzolanic material. The addition of lime and spent catalysts can increase the CBR value and reduce swelling of soils. The results of this study indicate that the maximum increase in soaked CBR and unsoaked CBR values occurred in soil mixtures with optimum lime content and 12% spent catalyst with 7 days of curing. While the soil mixture with optimum lime content and 12% spent catalyst, with 7 days of curing, is the best mixture that produces soaked CBR value of 49.67%, swelling of 0.15%, and plasticity index value of 11.97%, so the soil meets the requirements to be used as pavement subgrade. Keywords: expansive soil, stabilization, road structure, subgrade, road pavement Abstrak Tanah ekspansif memiliki potensi pengembangan dan penyusutan yang tinggi, sehingga dapat menyebabkan kerusakan struktur jalan. Oleh sebab itu, perlu dilakukan stabilisasi. Salah satu metode stabilisasi adalah menggunakan kapur dan spent catalyst dengan tujuan meningkatkan kapasitas dukung dan menurunkan swelling. Spent catalyst merupakan limbah pengolahan minyak bumi dan termasuk bahan pozzolan. Penam-bahan kapur dan spent catalyst mampu meningkatkan nilai CBR dan mereduksi swelling. Hasil studi ini menunjukkan bahwa peningkatan maksimum nilai CBR soaked maupun CBR unsoaked terjadi pada campuran tanah dengan kadar kapur optimum dan 12% spent catalyst dengan peraman 7 hari. Sedangkan campuran tanah dengan kadar kapur optimum dan 12% spent catalyst, dengan peraman 7 hari, merupakan campuran terbaik yang menghasilkan nilai CBR soaked sebesar 49,67%, swelling sebesar 0,15%, dan nilai indeks plastisitas sebesar 11,97%, sehingga tanah memenuhi syarat untuk digunakan sebagai tanah dasar perkerasan jalan. Kata-kata kunci: tanah ekspansif, stabilisasi, struktur jalan, tanah dasar, perkerasan jalan

Comparative analysis of laboratory unsoaked CBR values between micromaterials and limestone nanomaterials in expansive soil stabilization

“…The results of testing the physical and mechanical properties of expansive soil in the laboratory can be seen in Table 1. From these data, it is known that the physical and mechanical properties of the expansive soil under review are in accordance with the results of previous studies [8].…”

“…However, if the CBR value at 0.2inch penetration turns out to be higher, the test should be repeated. If the retest results still show a higher CBR value at 0.2-inch penetration, then the CBR value will be used in the design [8]. From the 0.1'' and 0.2'' penetration CBR tests that have been carried out, the CBR value used is the CBR value of 0.1'' penetration because the value is greater than the CBR value of 0.2'' penetration.…”

“…Stabilization of expansive soft soil using 0.03% nanoterrasil material can increase the CBR strength value of the soil three times the initial soil CBR strength value [8]. Nanobentonite addition to 0.5% clay resulted in increased compression, while the final void ratio decreased.…”

Comparison of the effectiveness of micromaterials and nanomaterials of lime as a stabilizing agent for expansive soils on the value of the plasticity index

“…The results of testing the physical and mechanical properties of expansive soil in the laboratory can be seen in Table 1. From these data, it is known that the physical properties of the expansive soil under review are in accordance with the results of previous studies that tested the soil in West Java province, specifically the construction of the Cisumdawa Highway which includes expansive soil [6,9,10].…”