Abstract
For water and sewer pipes, PVC is considered to be one of the best row materials. Due to its physical, chemical and industrial significant properties, PVC is commercially invited to be in the first position. Many other traditional raw materials; e.g. iron, concrete, polyethylene and vitrified clay (VC), are coming in second position. This work is conducted to study the tensile properties of two different types of PVC raw materials (named as gray and white) for water pipe manufacturing by implementing different test conditions. The samples were prepared by cutting off the pipe to an individual cross sectional size rings. Afterward, they were softened smoothly by heating the ring samples to obtain flat standard tensile test specimen. The influence of strain rate (crosshead speed), temperature and UV radiation on the tensile properties of PVC pipe’s row material were investigated. The selected experimental test temperatures are (28℃, 50℃ and 70℃), the selected crosshead speeds are (5, 50 and 100 mm/min) and the UV treatment exposure times are (168, 408, 744 and 1080) hours. The result shows that the gray PVC pipes have tensile strength greater than white PVC pipes. The yield stress and modulus of elasticity are directly proportion to strain rate and inversely proportion to the treatment temperature of both PVC samples. However, the fracture strain was increased with temperature and decreased with strain rate. UV treatment didn’t show a significant effect on the yield stress and modulus of elasticity. This is an indication of PVC long time stability.
Highlights
Since early 20th century, Poly(vinyl chloride) (PVC) as a raw industry compounds were widely used for exterior applications
The research work in this paper aims to study the tensile properties of two different PVC pipe materials under different conditions such as strain rate, temperature and UV radiation
The Effect of Strain Rate and Temperature Effects of temperature on the tensile property of the two types have been achieved by annealing the samples into three levels of temperatures (28 ̊C, 50 ̊C and 70 ̊C). 28 ̊C and 50 ̊C levels of temperature were chosen to cover the worldwide summer range of temperature. 70 ̊C annealed temperatures was chosen to speed up the heat treatment and aging following the Sturik description for heat treatment [9]
Summary
Since early 20th century, Poly(vinyl chloride) (PVC) as a raw industry compounds were widely used for exterior applications These applications include piping system for various purposes [1]. PVC pipes can be structured to have good weathering and service characteristics which are required in many environmental sites. This includes colour retention, physical property retention, and dimensional stability. Sun, temperature variation, rain and snow all affect the long time performance of PVC exterior pipes. Within this long time, white PVC is converted to yellow and the colour compounds will fade. Ultraviolet sunlight absorbed by the chemical structure is sufficient to break most of the chemical bonds in polymer [1]
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