STABILIZATION OF AN EXPANSIVE SOIL USING MICRO ASBUTON AND FLUXING AGENT

• Main Author: Widodo 269 97 009, Noerjahjo
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8827
• Institution: Institut Teknologi Bandung

Abstract: <br /> <br /> <br /> <br /> <br /> This thesis describes a laboratory investigation of soil stabilization using Micro Asbuton and fluxing agent. <br /> <br /> <br /> <br /> <br /> Soil samples were taken from Purwodadi. The soil is classified as CH (USCS) or A-7-5(AASHTO). Swelling measured after 4 days soaking prior to the CBR test was 9.41% and the soaked CBR value was 2.08%. The soil therefore exhibited very poor characteristics for use as a subgrade material <br /> <br /> <br /> <br /> <br /> Nine combinations of soil, Micro Asbuton and fluxing agent were investigated. The results from Combinations A, B and C (soil plus 10% Micro Asbuton by weight of the dry soil and 6, 8, 10% fluxing agent by weight of Micro Asbuton) showed no improvement on the results obtained with untreated soil. It was concluded that the amount of fluxing agent used in these combination was not sufficient to release the Micro Asbuton bitumen. For this reason, the amount of fluxing agent used in the other combinations investigated was increased and based on the weight of dry soil. <br /> <br /> <br /> <br /> <br /> The results of the investigation show that Combination F (soil plus 10% Micro Asbuton by weight of the dry soil and 10% fluxing agent by weight of the dry soil) is the best of the combinations investigated. The soaked CBR value for Combination F at 0 days curing time was 10.67%; when curing time was extended to 7 days the CBR value increased to 11.11% and when extended to 14 days, the CBR value reduced to 9.00%. <br /> <br /> <br /> <br /> <br /> The soils were lower than the UCS value of untreated soil, with the exception of the UCS values for Combinations A, B and C which were lower than, but reasonably close to, the UCS of untreated soil. The effect of adding Micro Asbuton and fluxing agent was to create a granular soil structure and the strength of the treated soil cannot be evaluated with the UCS test. <br /> <br /> <br /> <br /> <br /> Combination F yielded the lowest swelling value, 1.96% after 7 days curing followed by 4 days soaking.On the basis of CBR value, it appears that while combination F is not acceptable for use as subbase material, it can be used satisfactorily for subgrade material. Data on the effect of curing time on CBR and swelling characteristics do not indicate a consistent trend. <br />