Abstract
Peat is a type of soil with high organic content, very low bearing capacity, and high uneven settlement. Some methods to improve soil have been applied to peat in order to make it strong enough for civilization-building foundation situated on it. Peat stabilization is a method that is continuously developed considering that the cost it needs is lower and this approach is more environmentally friendly compared to other methods. The admixture of lime (CaCO3) and Rice husk ash, a new ecofriendly stabilizer material, has been applied to peat soil and showed a good result. However, in studies conducted previously, the effect of water infiltration from surrounding areas of soil was stabilized was not involved as variable influencing the change of parameter. Based on that, this laboratory study was carried out to model the real condition in the field when the stabilization is performed and to identify the physical and engineering changes of peat soil in the 10th, 20th, and 30th days of stabilization in its border and middle parts, with the percentage of material stabilizer 5%, 10%, 15% and 20% of the unit weight of the initial condition of peat. The result of laboratory test shows that the addition of admixture of lime (CaCO3) and rice husk ash can improve the physical and engineering properties of peat soil are stabilized. Water infiltration occurred on peat soil is stabilized has not affected the physical and engineering properties of the soil. It can be seen from the physical and engineering properties of the border and central parts of peat soil is stabilized that still have a similar value. It is assumed to be caused by CaSiO3 gel formed still needs a longer duration to become stable gel. However, in this initial study it was known that the more stabilizers added, made the better the parameters of the stabilized peat soil.
Highlights
Peat is the organic soil formed from soil decomposition within around 18.000 years [1]) with bad characteristics for civil building foundation
Based on the test carried out on the undisturbed peat soil sample in the laboratory (Table 1) we found that the peat in Palangkaraya can be classified as Moderate Fibrous Peat Soil, Hemic, and Low Ash with high acidity, based on the ASTM D-4427-92 [13]
From the description of the physical and engineering changes of peat stabilizedusing the admixture of lime (CaCO3) and Rice husk ash, some conclusions can be withdrawn as follows: 1. The addition of admixture into fibrous peat causes the formation of CaSiO3 gel fills pores and wraps the fibers of peat
Summary
Peat is the organic soil formed from soil decomposition within around 18.000 years [1]) with bad characteristics for civil building foundation. The physical characteristics of this soil include the ratio of organic content (Oc) >75%, unit weight (γt) around 1,0 gr/ cm, water content (WC) >500%, specific gravity (Gs) 1,2-1,6 and void ratio (e) 5-11 Due to those physical properties, peat soil has the very low bearing capacity (5-7, kPa) and the compression is big and uneven for a long period of time [2, 3, 4, 5, 6, 7, 8, 9] Some efforts for improving peat soil have been carried out to enable it to be a foundation of civil construction including the use of corduroy, wood mini pile, preloading, replacement, and stabilization.
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