Shear strength of clayey sand treated by nanoclay mixed with recycled polyester fiber

The main objective of this study is to investigate the effects of the nanoclay mixed with recycled polyester fiber on the mechanical behavior of soil as a new stabilizer material.To meet this objective,a series of drained direct shear and compaction tests were performed on unreinforced and reinforced soil specimens with three different combinations of the fiber-soil ratios ranging between 0.1%and 0.5%,as well as three different combinations of nanoclay soil ratios ranging between 0.5%and 1.5%of the soil dry weight.Results indicated that composition of the nanoclay recycled polyester fiber with the soil improved the friction angle(Φ)by 41%and cohesion(c)by 174%.The soil particles stick together through viscose gel produced by nanoclay.In addition,the rough and wavy surface of the fibers creates a bond and friction between the soil particles and prevents the movement of soil particles,and as a result,the soil strength is increased.

Strength properties of soft clay treated with mixture of nano-SiO_2 and recycled polyester fiber

This paper investigates the effect of recycled polyester fiber, produced from polyethylene （PET） bottles, in combination with nano-SiO2 as a new stabilizer to improve the mechanical properties of soils. We intend to study the effect of adding nano-SiO2 and recycled polyester fiber on soil engineering properties, especially the shear strength and unconfined compressive strength （UCS）, using clayey soil with low liquid limit. Three different combinations of fiber-soil ratios ranging between 0.1% and 0.5% as well as three different combinations of nano-soil ratios ranging between 0.5% and 1% are used. The shear strength and UCS of treated specimens are obtained from direct shear test and unconfined compression test, respectively. Results of this study show that the addition of recycled polyester fiber and nano-SiO2 increases the strength of soil specimens. Both the shear strength and UCS are improved by increasing the contents of recycled polyester fiber and nano-SiO2 in the soil mixture. The increase in the nano-SiO2 content leads to a reduction in failure strain, but the increase in the content of recycled polyester fiber leads to an increase in failure strain. The increase in the contents of recycled polyester fiber and nano-SiO2 leads to an increase in elastic modulus of soils. Based on the test results, the addition of recycled polyester fiber improves the mechanical properties of soils stabilized with nano-SiO2 as well as the recycled polyester fiber has a positive effect on soil behaviors.

Effects of Eco-Friendly Carrier on Low-Temperature Dyeing of Recycled Polyester Knit Fabrics

This work focused on effects of an eco-friendly carrier JYK on thermal properties,dye uptake,color yield(K/S values)and color fastness of recycled polyester knit fabrics.The study also explored optimization of the low-temperature carrier(LTC)dyeing and compared its dyeing performance to the high-temperature and high-pressure(HTHP)dyeing.Results showed that the eco-friendly carrier JYK had an obvious plasticizing effect on recycled polyester,which significantly reduced the glass transition temperature,thereby reducing the dyeing temperature and benefiting low-temperature dyeing.The optimal dyeing conditions were determined as follows:the disperse dye was 2%on weight of fabric(owf)and the eco-friendly carrier JYK was 2%owf at 98℃dyeing temperature for 60 min.Compared with the HTHP dyeing,there was no significant difference in the K/S values and color fastness of recycled polyester fabrics dyed in the low-temperature method which demonstrated that the low-temperature method could be totally accepted.This study indicated that the low-temperature dyeing with a carrier JYK could be an effective and sustainable method for dyeing recycled polyester.

4th China International Recycled Polyester Conference held in Hangzhou

In 2008 there are many events taking place in China: tightened currency policy, new labor law and new enterprise income tax law, as well as the Recycling Economic Law, which will directly impact recycling industry. How will those changes in policies influence recycling industry in the future?