This article explores the potential of vibro-acoustics to detect physical ageing plastic pipes. For this purpose, two different topics are combined: ability estimate storage modulus a pipe, and sensitivity estimated changes due ageing. Concerning first topic, vibro-acoustic method was applied water-filled HDPE pipes, one surrounded by air another sand. The excitation achieved via an impact hamm...

Geothermal pavements have the potential to reduce pavement surface temperature by circulating fluid in pipes within structure. This research investigated an innovative geothermal system with multiple benefits, such as reducing and harvesting heat energy for power generation. aimed provide understanding of mechanical properties constructed construction demolition (C&D) waste materials throug...

In this study, blends based on a high density polyethylene (HDPE) and chitosan (CS) were successfully prepared by melt processing, in a laboratory internal mixer. The CS biopolymer content effect (up to maximum of 40%), and, the addition of bentonite clay modified with quaternary ammonium salt (CTAB) impregnated chitosan as a compatibilizing agent, on the properties of the blends was analyzed b...

The objective of this study was to examine the effects of the hydroxyapatite (HA) reinforcement morphology and content on the fatigue behavior of HA reinforced high density polyethylene (HDPE). To this end, HDPE was reinforced with 20 and 40 vol% of either HA whiskers or an equiaxed HA powder, and tested in four-point bending fatigue under simulated physiological conditions. The fatigue life, m...

A question frequently asked about HDPEgeomembranes is “how long will they last?” After more than 30 years of experience with exposed (weathered) HDPE-geomembranes, the authors address the question from the designer’s view point. The engineer needs to know, if available test methods tell us how long the geomembrane will last, and which properties must be specified and what are the minimum accept...

The development of value-added products made from post-consumer plastic recyclates has become an important goal in the quest for a sustainable society. To attain such goal, tools with higher accuracy and wider scope are increasingly necessary. The present work describes the application of a Life Cycle Assessment (LCA)/Life Cycle Costing (LCC) integrated model, with inclusion of externalities (e...

Producing both hydrogen and high-value carbon nanotubes (CNTs) derived from waste plastics is reported here using a pyrolysis-reforming technology comprising a two-stage reaction system, in the presence of steam and a Ni-Mn-Al catalyst. The waste plastics consisted of plastics from a motor oil container (MOC), commercial waste high density polyethylene (HDPE) and regranulated HDPE waste contain...

I describe possible ways to discover hard double pomeron exchange (HDPE) with the existing detectors at the Fermilab Tevatron, by using the small-angle " luminosity " counters as a veto. Estimates of the cross sections and backgrounds are made. In addition to the intrinsic importance of HDPE, its observation would be useful for calibrating the detectors, and for estimating the " survival probab...

Osteolysis remains the most important problem in orthopedic implant failure. Wear debris from the implant contains polyethylene (PE) particulate which has been shown to activate monocyte-derived macrophages (MDM). Although the response of MDM has been shown to be influenced by the size, shape, and chemical type of PE, the effect of chemically altered PE on MDM has not been studied. In this stud...

Novel catalyst called super active for the production of high density polyethylene (HDPE) pipes grade 100 was prepared and localized first time in Iran. The purpose this paper is to evaluate performance new compare it with Finix-112 which a commercial HEPE 100. Extensive experiments were performed on physical mechanical properties product using both catalysts including melt flow index, particle...