Invention Journal of Research Technology in Engineering & Management (IJRTEM) ISSN: 2455-3689 www.Ijrtem. com Volume 3 Issue 5 ǁ July –August 2019 ǁ PP 32-39 |Volume 3| Issue 5| www.ijrtem.com | 32 | Effect of Feldspar on the Properties of Swelling, Shrinkage and Bearing Capacity of Expansive Clay Soil 1, Gatot Rusbintardjo, 2, Lisa Fitriyana, 3, Abdul Rochim 3) 1,2,3) Department of Civil Engineering, Faculty of Engineering, Sultan Agung Islamic University (UNISSULA), Semarang, Indonesia ABSTRACT: Expansive soil is a kind of soil to have high potential for swelling and shrinkage where it has low bearing capacity. On the pavement that laid over the expamsive soil, the uneveness of upward movement caused swelling that it potentially damaged to the road. This study aimed at minimizing the potential of swellimg and shrinkage, while at the same time improving the bearing capacity of the subgrade expansive clay soil through stabilization using the Feldspar, a group rock-forming tectosilicate minerals that made up about 41% of the earth’s continental crust by weight. 5 to 30% of Feldspar with increment of 5% by weight of the soil were added. Atterberg Limit, Direct Shear, and California Bearing Ratio (CBR) test were conducted. Result in Atterberg Limit test showed that the adding of Feldspar to 30% in the expansive soil did not indicate reduction in thr swelling potential. Potential for swelling become zero only if was Feldspar content added to 55% by weight of the expansive soil. However, the results in Direct Shear and CBR tests indicated that the bearing capacity of the expansive soil improved as a result in the increasing of Feldspar content in the soil. With reference to the result in the study, it could be inferred that Fldspar was feasible and had the potential to be stabilizing materials for expansive clay soil. KEYWORD: Soil stabilization, Expansive clay soil, Feldspar, Swelling/Shrinkage, Bearing Capacity I. INTRODUCTION Most types of soil in North-East of Java island are expansive clay soil which contains a lot of montmorillonite minerals [1], cause the roads built in that area are always damaged. Expansive soil is a term usually applied to any soil that has a potential for shrinking or swelling due to changes in its moisture content. It is recognized there are two main factors that provides the potential of the soil to swell and/or shrink: the properties of the soil and the environmental conditions of the area. The main soil parameters included within the first factor are the clay mineralogy, the soil water chemistry, the soil suction, the structure of the soil (fabric) and its dry density. Within the environmental conditions of the area, the initial moisture condition, the moisture variations and the stress conditions are the factors believed to control the soil movement [2]. The mechanism of the development of longitudinal cracks at the pavement in arid environments has been described by [3] . Mechanism of longitudinal crack development on pavement over expansive clays during dry season, illustrated in Fig. 1, while tensile stresses induced by flexion of the pavement during settlements caused by the dry season leads to the development of longitudinal cracks are shown in Fig. 2. Fig. 1. Mechanism of longitudinal crack development on pavement over expansive clays during dry season. (Modified from [3]). During the dry season there is a drop off in moisture content of the soil in the shoulders of the pavement structure. The consequence of this reduction in moisture is a settlement in the shoulders that does not take place in the centre of the pavement where the moisture of the soil remains stable thorough the year. The appearance of cracks in the shoulder of the pavement accelerates the evaporation of the interstitial water of the soil reaching also greater depths [2]. The great volumetric expansion and contraction potential of these soils can be explained empirically through a direct correlation to plasticity index [4] or from a theoretical approach [5].
Effect of Feldspar on the Properties of Swelling, Shrinkage and Bearing Capacity of Expansive Clay Soil
Jul 01, 2023
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