Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Stabilization of adam expansive soil for possible use as pavement subgrade

Auteur : Al-Hashmi, Khalil Ibrahim Mubarak.

Université de soutenance : Sultan Qaboos University

Grade : Master of Science (MS) in Civil Engineering 2018

Résumé partiel
Expansive soils are well-known as main cause of many crack problems in civil engineering structures. The phenomenon of shrinkage and swelling due to drying and wetting cycles gave these soils the importance to be studied. This research reports the findings of an experimental study to reduce swelling behavior. For this purpose, an expansive soil was selected from Adam due to many damages on existing buildings and asphalt pavements ranging in age from 3-6 years old. Soil samples were obtained from a site in Adam. The soil was subjected to an extensive laboratory testing such as Atterberg’s limits, wet sieve analysis, hydrometer, compaction, California bearing ratio (CBR), unconfined compressive strength, swelling, specific gravity, suction, X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscope (SEM) tests. The soil was stabilized with different stabilizers such as cement, Cement-By-Pass-Dust (CBPD) and lime. It was found that Adam soil is a highly plastic clay. Liquid limit, plastic limit and plasticity index were 83%, 35% and 48% respectively. It was also found that 69 % of the sample particles are fines (silt and clay) with an amount of clay of about 45%. The percentages of gravel and sand were 16% and 15% respectively. Adam soil is composed of expanding minerals such as montmorillonite, calcite, palygorskite, gypsum and others. These minerals exhibit swelling behavior upon wetting and shrinkage upon drying and that what explain the high swelling potential that exhibited by this type of soil which reached 10.40 % and swelling pressure of about 84 kN/m2 for the untreated soil sample.

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