International Journal on Advanced Science, Engineering and Information Technology, Vol. 8 (2018) No. 3, DOI:10.18517/ijaseit.8.3.4317

Compression Behaviour of Fibrous Peat Stabilized with Admixtures of Lime CaCO3+Rice Hush Ash and Lime CaCO3+Fly Ash

Noor Endah Mochtar, Faisal Estu Yulianto

Abstract

Compression behavior of stabilized fibrous peat has similar behavior with the initial one.  Therefore, one step loading consolidation test is still applicable for the stabilized fibrous peat to predict its compression. The stabilized fibrous peat behavior, however, still depends on type of the admixture used and stabilization age or curing period. Based on that reason, this study was carried out in order to study the change of compression behavior of the stabilized peat and to know whether the correction curves developed for laboratory compression parameters are still applicable to predict the settlement of the stabilized peat in the field. For this purpose, two types of stabilize material adopted, admixtures lime CaCO3+Rice Hush Ash (admix-1) and lime CaCO3+Fly Ash (admix-2). The stabilized peats were cured and tested at different curing periods 20, 30, 45, 60 and 90 days in order to check their behavior changes. Besides, laboratory models of peat stabilized at different layer thicknesses 1/3H, 2/3H, and H (H=peat sample thickness) were carried out in order to monitor their settlement under 50kPa load at different curing periods. This settlement is then compared with the predicted settlement. The results show that the fibrous peat stabilized with admixture-2 gives better behavior improvement than the one stabilized with admix-1; afterwards, however, it is slightly decreases after curing periods reach 60 days; it is due to the fibrous decomposition. In addition, peat stabilized with admix-2 also gives very good settlement prediction.

Keywords:

admixture; compression; fibrous peat; fly ash; laboratory model; lime CaCO3; rice hush ash; stabilization.

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