Stabilization of a poorly-graded sand with cut-back bitumen and a soil water slurry.

Budihartanto, Eko (2012) Stabilization of a poorly-graded sand with cut-back bitumen and a soil water slurry.

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Deposits resulting from river floods and volcanic eruptions are major sources of sand in Indonesia. Many can be used directly for construction activities, others require modification, particularly to the particle size distribution, before they can be used. The objective of the research programme described in this thesis was to determine if a satisfactory road base material could be made by combining medium curing cut-back bitumen, poorly-graded sand and a slurry of water and soil. Four slurry combinations were investigated; for control purposes, a mix consisting of cut-back bitumen and sand only was also investigated. The sand sample was obtained from Cimalaka and individual particle sizes were separated and then, recombined to meet the median of the Asphalt Institute's specification for sand-bitumen material. The median gradation has coefficients of uniformity and curvature of 7.2 and 0.6, respectively and hence can be classified as "poorly-graded". The soil was sampled at Tanjungsari and was classified as A-2-4 (AASHTO) and SC-SP (USCS). Marshall analysis was performed on various conmbinations of materials cured for periods of 10 and 30 days and the most satisfactory combination was found to be that containing 84.8 % sand, 4.8 %t cut-back bitumen and a slurry made of 5.0 % soil and 5.4 % water. The material proportions are expressed as %ages by weight of the total mixture. A modified Marshall-immersion test and indirect tensile strength and resilient modulus tests were retained stability was found to be 79 %, after immersion for 4 days in water at 25 o C. The influence of temperature and curing time on the indirect tensile strength of the material is relatively insignificant. The reduction in resilient modulus as temperature is increased is more significant at the longer curing period. Resilient modulus is increased considerably, particularly at lower temperatures, when curing period is increased from 10 to 30 days. All of the mix combinations investigated satisfy the ASPHALT INSTITUTE (1975) criteria for a sand-bitumenroadbase. However the composition identified as being most satisfactory meets, in addition, criteria that have been established by other investigations.

Item Type: Article
Subjects: Collections > Koleksi Perpustakaan Di Indonesia > Perpustakaan Di Indonesia > JBPTITBPP > S2-Theses > Engineering > Highway Systems And Eng. > 1998
Divisions: Universitas Komputer Indonesia > Perpustakaan UNIKOM
Depositing User: Admin Repository
Date Deposited: 16 Nov 2016 07:37
Last Modified: 16 Nov 2016 07:37

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