Abstract
Some laterite soil is an inferior material for engineering applications such as road and highway pavement, dam construction and filling material. Laterite soil stabilization is required to increase its strength for field application purposes. The potential use of zeolite and waterglass as stabilizing agents is their pozzolanic properties. This study aims to analyze the strength and bearing capacity of laterite soil stabilized by waterglass-activated zeolite and reinforced with geogrid. The soil sample was prepared with a zeolite percentage of 4, 8, 12, 16 and 20%, and waterglass as much as 2, 4 and 6% with curing times of 0, 7, 14 and 28 days. Furthermore, the physical model test was carried out in the container with the optimum composition obtained from the compressive strength (UCS) and California bearing test (CBR) test. The stabilized subbase layer with geogrid reinforcement was placed on a subgrade layer with a substandard CBR value. The results showed that the compressive strength (UCS) of stabilized soil with a curing time of 7 days was found significantly increased. The CBR value also increased with the content of additive and curing time compared to the untreated soil. The physical model test results showed that the performance of stabilized laterite soil with additives and reinforced by geogrid (ZW-geogrid) as a subbase layer provides more optimal performance in carrying the load compared to the sand-gravel mixtures material. Doi: 10.28991/CEJ-2022-08-02-05 Full Text: PDF
Highlights
Laterite soils are collected from various weathered rocks under strong oxidizing states and are rich in iron oxides
Geogrid will provide resistance to tensile stresses that occur in the pavement layer when receiving vehicle load
The stresses under the plate load are restrained by the presence of confinement tensions which prevent lateral displacement
Summary
Laterite soils are collected from various weathered rocks under strong oxidizing states and are rich in iron oxides. Laterite soil is a natural material that is inexpensive and widely available as a construction material. The use of laterite soil without stabilization often causes problems with bearing capacity, especially when applied to road construction. The problems often encountered in laterite soils include sensitivity, degree of swelling-shrinkage potential, and a decrease in strength during and after construction. The results showed that the CBR value of stabilized lateritic soils increased by up to 6% [1]. Some laboratory test results showed that lateritic soil stabilization significantly increased the CBR and Resilient Modulus (Mr) of the soil mixtures [2,3,4]
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