Abstract
The loose sand is subject to large settlement when it is exposed to high stresses. This settlement is due to the nature of the high drainage of sand, which displays foundations and constructions to a large danger. The densification of loose sandy soils is required to provide sufficient bearing capacity for the structures. Thus soil stabilization is used to avoid failure in the facilities. Traditional methods of stabilized sandy soil such as fly ash, bituminous, and cement often require an extended curing period. The use of polymers to stabilize sandy soils is more extensive nowadays because it does not require a long curing time in addition to being chemically stable. In this study, the effect of adding different percentages of high-density polyethylene HDPE to the sandy soils' engineering characteristics such as the angle of internal frictions Ø0, shear strength τ, California Bearing Ratio CBR, and permeability k was studied. The results of laboratory tests showed that using of HDPE at percentages (0.1, 0.3, 0.6, 1, and 3%) led to a decrease in soil permeability by 18% and an increase in both the angle of internal friction, the CBR value, and shear strength about 27.2%, 180.9%, and 38.6 % respectively by adding 1%. HDPE.
Highlights
High-density polyethylene high-density polyethylene (HDPE) is a new category of petrochemical products
The results showed a 68.54% increase in shear strength, 55.56% increase in the angle of internal friction Ø0at 2% HDPE for small size strip
An increase in the angle of internal friction was observed upon increasing the polymer ratio, which reached an increase of 27.2% when 1% of HDPE was added
Summary
High-density polyethylene HDPE is a new category of petrochemical products. It consists of two carbons and four atoms of hydrogen in the base polymer repeat unit. (Talib, 2018) showed that the addition of high-density polyethylene HDPE (2-5mm) size with a ratio of (20, 40, 50, 75, and 100%) to dry weight of sandy soil will affect the properties of sandy soil, such as a decrease in maximum and minimum density of sand about 64% and 60% respectively at 75% HDPE, increase in the angle of internal friction Ø0 and a large increase in permeability of sand with adding HDPE. (15 × 20 mm), and 61.9% reduction in permeability at 5% HDPE for large size strip (25 × 30 mm) This current research aims to study the effect of adding different percentages (0.1, 0.3, 0.6, 1, and 3%) of high-density polyethylene HDPE to the sandy soils' engineering characteristics, such as the angle of internal frictions, shear strength, California Bearing Ratio, and permeability. Unit Weight, γmin (kN/m3) Dry unit weight, γd (kN/m3) Angle of internal friction, Ø0 Permeability, k cm/sec
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