Compression Behavior of Fibrous Peat Stabilized with Admixtures of Lime CaCO3+Rice Husk Ash and Lime CaCO3+Fly Ash

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 the type of the admixture used and stabilization age or curing period. Based on that reason, this study was carried out 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 stabilizing material adopted, admixtures lime CaCO3+Rice Husk 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 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 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; it is, however, then slightly decreases after 60 days of curing periods due to the fiber decomposition. Peat stabilized with admix-2 also give first settlement prediction when it is compared to the settlement of stabilized peat in the laboratory model.

Acceleration of Decomposition Process by Lignocellulolytic Bacteria and Its Effect on the Physical and Engineering Properties of Kalimantan Fibrous Peat

“…15, it can also be known that the vertical strain that occurred was getting bigger as the increase in curing period. This is in line with the results of a study conducted by Mochtar and Yulianto [6].…”

“…Studies on soil improvement of peat with stabilization method using 10% of lime CaCO3 + pozolan (mixture of rice husk ash or fly ash) have been conducted [4][5][6]. The results show that in 20-45 days of curing period, the behavior of stabilized fibrous peat soil improved.…”

Characteristics of Palangkaraya fibrous peat

“…The properties of the Palangkaraya fibrous peat soil resulted from laboratory/field testing is shown by Table 1. The results of the test show that the Palangkaraya fiber peat soil is still in the intervals of other researcher [4][5][6][7][8][9][10][11][12]. ASTM D4427-84 states that peat soil classification is based on fiber content, ash content, acidity, and water content.…”

Improvement of Peat Soil Settlement Parameter Using Soybean Crude Urease Calcite Precipitation (SCU-CP) Method

“…The precipitated calcite covers the pore space, reducing the porosity and permeability of the soil. Research conducted by Mochtar and Yulianto [36] regarding compression behavior of fibrous peat stabilized with admixtures of lime CaCO3 and Rice Husk Ash (admix-1) also Lime CaCO3 and Fly Ash (admix-2), resulted that the value of the compression rate was influenced by the type of mixture and The curing time, which in the use of admix-2, has a high compression rate because at the time of formation of CaSiO3 in the pore space there is not enough water for reaction formation so that the volume changes during crystal formation. As for calcite percipitation method, an increase in the rate of compression occurs due to an increase in soil cohesion so that the soil has a rigid consistency so that the soil sample will reach the compression limit faster, but the effect of calcite formation is influenced by organic content.…”