STRENGTH CHARACTERISTICS OF COARSELY - GRADED SOIL AT LOW CONCENTRATIONS OF EMC2 STABILIZE

• Main Author: Saad, Demsi
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2875
• Institution: Institut Teknologi Bandung

STRENGTH CHARACTERISTICS OF COARSELY-GRADED SOIL AT LOW CONCENTRATIONS OF EMC2 STABILIZER, DEMSI SAAR, 1996, Program Magister Sistem dan Teknik Jalan Raya, Program Pascasarjana, Institut Teknologi Bandung. A study of the compaction and strength characteristics of three soils from Palembang (Semen Api, Pasir Merah and Pasir Batu) and one from Cikalong treated with a biological catalyst stabilizer, Earth Material Catalyst (EMC2), has been carried out. The three Palembang soils, classified as coarse-grained materials, were selected in order to provide a wide range of soil types. Tests on untreated soil were made to evaluate the influence of this stabilizer at different concentrations and curing times The soil samples treated with EMC2 were prepared at low concentrations i.e. dilution ratios (parts by volume of EMC2 to parts by volume of water) of 1:60, 1:75 and 1:90 and optimum moisture content at each dilution ratio was determined. The effect of curing periods of 1, 3, 7 and 14 days on strength and compaction characteristics of EMC2-treated soils was also evaluated. The addition of EMC2 in the amounts investigated appears not to have effected significantly the compaction characteristics of any of the soils studied and values of MDD and OMC obtained are comparable with those obtained for untreated soil. The trend in strength development for all soil types, as indicated by CBR and DCP values, was not consistent with variation in dilution ratio and curing time. Higher EMC2 concentration and longer curing times did not always result in improved strength characteristics. In the case of Semen Api soil, the maximum increase in CBR value (from 5.3% to 10.2%) was observed at dilution ratio of 1:75 and a curing time of 14 days. Maximum increase in the CBR values of Pasir Merah and Pasir Batu soils, 33.0% to 46.7% and 14% to 33.3% respectively, were observed when the former was treated at a dilution of 1:90 and cured for one day, the latter at a dilution ratio of 1:60 and cured for one day. Maximum strength, as indicated by the DCP, occurred at a dilution ratio of 1:90 and after 3 days curing in the case of Semen Api soil. Corresponding data for the Pasir Merah and Pasir Batu soils are 1:90 dilution ratio/3 days curing and 1:90 dilution ratio/7 days curing. As indicated above, optimum combination of dilution ratio and curing time are not the same for CBR and DCP testing. In general poor correlation was found to exist between CBR and DCP measurements made on nominally identical samples