STABILISATION OF PASIR URUG WITH LIME AND FLY ASH

• Main Author: Saunyoto, Eddy
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2698
• Institution: Institut Teknologi Bandung

This thesis describes an investigation of the effect of a lime - fly ash admixture on the density and strength characteristics of pasir urug, a material that is cheap and widely available but considered sub-standard for use, as it occurs,in road base construction. Three admixture contents were investigated viz 10, 20 and 30 percent by weight of total mix. Within each admixture content, a range of lime - fly asji ratios were studied; however, the range was different for the three admixture contents, although there was some overlap. Strength was evaluated using the unconfined compression test and variations in moisture content and dry density were studied as was the influence of curing time. Mixes were evaluated against the Bina Marga strength criterion for cement bound road base material. Mixes compacted to maximum dry density at optimum moisture content posess higher strength; in the case where dry density is reduced to 95 percent of maximum, a mix containing optimum moisture content has superior strength to a mix with 1 percentage point less than optimum which in turn is superior to a mix containing 1 percentage in excess of optimum. At each admixture content, increase in lime fly ash ratio generally results in strength increase. The beneficial effects of curing are not so apparent at low fly ash ratios. The particular structure of the test programme does not permit determination of the optimum combination of lime, fly ash and pasir urug. However, considering each combination separately, none meets the strength criterion of Bina Marga for cement-bound road base material.