International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 05 | May 2023
p-ISSN: 2395-0072
www.irjet.net
Effect of Granite Powder and Polypropylene Fiber on Geotechnical Properties of Expansive Soil Alshimaa Farghaly1, Prof. Mahmoud Abo Bakr Alsedik2, Lect. Mustafa Fawzy3 1MSc student, Dept of Civil Engineering Al-Azhar University, Cairo, Egypt 2Professor, Dept of Civil Engineering, Al-Azhar University, Cairo, Egypt
3 lecturer, Dept of Civil Engineering, Al-Azhar University, Cairo, Egypt ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Expansive soil shows dual swell-shrink under
techniques like using lime, cement, and granite. The mechanical approach such as polypropylene fiber and nylon [3]. Several researchers studied the effect of polypropylene fiber only on expansive soil, using polypropylene fiber was an effective method in reducing the swell potential and swelling pressure of soils [2,4]. Also, this research reported that the optimum percentage of (PPF) is 2% for stabilizing the soil, with 2% fiber given the highest from (UCS) and a lower value of swelling [3]. The addition of varying aspect ratios of fibers increases the optimum moisture content and decreases the maximum dry density, also increasing the value of cohesion and decreasing in value of the angle of internal friction [5]. Other studies that mixed polypropylene with materials, such as [6]; investigated the effect of polypropylene fiber and silica fume. The inclusion of silica fume and PPF reduces the plastic index and liquid limit of the soil and increases the plastic limit, the soil changed its classification from high-plastic clays (CH) to low-plastic clays (OH). [7]; reported that the effect of using rice husk ash, lime, and polypropylene fibers in expansive soil. The addition of RHA-lime increases the strength. As the pozzolanic reactions are time-dependent, the soil gains strength with an increased curing period. The addition of fibers to RHA-lime stabilized expansive soil mixes, increases the strength. [8]; studied using brick powder and PPF to improve the soil. The optimum quantity of brick powder and PPF was found to be 40% and 0.35% for 60% soil. these proportions increased the CBR values.[9]; showed the effectiveness of a collection of marble dust, cement kiln, and PPF to increase the unconfined compressive strength. [10]; the study found that coir fiber and Nano silica influence the strength, permeability, and swelling potential.
changing water content which is not suitable for construction. This soil is found in several places in Egypt, so it must be treated. In this paper, it was studied one of the methods of treating expansive soil, which was using of polypropylene fiber and granite powder to stabilize the expansive soil. In the investigation, the soil was taken from the 5th Settlement in Cairo, Egypt, and mixed with percentages of granite powder (1.5%, 3%, 6%, 9%, 20%,30%, and 40% by weight of soil) and polypropylene fiber (0.25%, 0.5%, 0.75%, and 1% by weight of soil). Specific gravity, Atterberg’s limits, free swell, and compaction tests were applied to natural soil and soil treated with percentages of granite powder. Through tests, it was found that the optimum percentage of granite powder was 30%, so this proportion was mixed with percentages of polypropylene fiber. Then the direct shear and consolidation tests were conducted on these proportions. The direct shear samples were carried out immediately, with 14 and 28 days of curing. The results show the addition of 30% granite powder reduced the free swell index from 120% to 62%, reduced moisture content from 14.8% to 11.5%, increased maximum dry density from 17 KN/m3 to 19.3 KN/m3, increased the cohesion from 0.46 Kg/cm2 to 0.72 Kg/cm2 and increased the angle of internal friction from 15.38° to 24.23°. These results also indicated that polypropylene fiber with granite powder did not have an effective effect on the expansive soil. Key Words: Expansive soil, Granite powder, Polypropylene fiber, Cohesion & angle of internal friction.
1.INTRODUCTION Expansive soils occur in climatic zones characterized by alternate wet and dry seasons. The expansive soils experience periodic swelling and shrinkage during the alternate wet and dry seasons. The montmorillonite clay mineral contributes mainly to this behavior. Such cyclic swell-shrink movements of the ground cause considerable damage to the structures found on them [1]. In the United States, damage caused by expansive clays exceeds the combined average annual damage from floods, hurricanes, and earthquakes [2]. So, it is important to study the properties of these soils and how to treat them to overcome these problems. Stabilization of soils can be done in two main ways, chemical, and mechanical techniques. Chemical
© 2023, IRJET
|
Impact Factor value: 8.226
Recently, granite powder has been used as a soil stabilizer, [11]; studied the effect of granite dust and lime on black cotton soil. The result showed the CBR value increased, the optimum moisture content reduced and the maximum dry density increased. [12]; addition of the fine silica sand and granite powder waste change the swelling potential of expansive soils sample which classified as a high swelling potentially soil to low expansive soils. Here, in this project, soil stabilization has been done with the help of admixtures of polypropylene fibers as a mechanical reinforcement and granite powder as a chemical stabilization.
|
ISO 9001:2008 Certified Journal
|
Page 18