Putera Agung Maha Agung, Sutikno, Muhammad Fathur Rouf Hasan, Aida Nurfitria, Agung Sedayu, Zaindra Fakhri Salim, Adi Susilo
There are many problems regarding expansive soils, including some influences such as swelling and/or shrinkage, fluctuation of water content, etc., to California Bearing Ratio (CBR) value during a compaction process. The research aims to stabilize expansive soil using a sand layer insulated by geotextile (G) or ordinary plastic (OP) to reduce the swelling potential on the predicted CBR value. The simulation compaction process using a modified compaction test (ASTM D 1557-07) at the laboratory was carried out layer by layer as a basis for implementing the highway subgrade. Laboratory simulation used two model layers, these are: firstly, 3 (three) layers type: expansive soil + sand + expansive soil; secondly, 5 (five) layers type: sand + expansive soil + sand + expansive soil + sand. G1/OP1 to G4/OP4 indicated the number of geotextile and/or ordinary plastic installed for both models, where G1/OP1 meant 1 (one) layer of geotextile (G) or ordinary plastic (OP), and so on. Laboratory test results show that average value of CBR of the original soil was 7.91%, with swelling potential closing to 14.42%, and could be classified as high swelling potential. All values of swelling potential from laboratory simulation using 5 (five) layers were better than 3 (three) layers. Generally, combining additional sand-geotextile or ordinary plastic material can help stabilize expansive soil. Laboratory simulation of 5 layers with additional geotextile or ordinary plastic is not only in increasing the CBR value on formation G2/OP1 but also in reducing of swelling potential on formation G2/OP4. © Published under licence by IOP Publishing Ltd.
Department Civil Engineering, Politeknik Negeri Jakarta, Depok, 16425, Indonesia; Regional Disaster Management Agency (BPBD), Batu City, 65313, Indonesia; Department of Physics, Brawijaya University, Malang, 65145, Indonesia
