Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Scrap tires


The Effect of Scrap Tires Recycled Steel Fibers on Some Hardened Properties of Green SCC

Nadeem Salam; Wasan I. Khalil

Engineering and Technology Journal, 2022, Volume 40, Issue 5, Pages 1-9
DOI: 10.30684/etj.2022.132605.1133

The purpose of this study is to investigate some hardened properties of green self-compacting concrete (GSCC) with 15% volumetric replacements of crushed clay brick waste as coarse aggregate and reinforced with scrap tires recycled steel fibers (STRSF) with 0, 0.25, 0.5and 0.75%volume fraction and 40 as an aspect ratio. Also, a combination of two STRSF aspect ratios of 40 and 60 was used in GSCC as hybrid fiber reinforcement (0.25 and 0.25%, 0.5 and 0.25%, 0.25 and 0.5% of aspect ratios 40 and 65, respectively). Scrap tires recycled steel fibers had been used to improve the properties of the green self-compacting concrete containing crushed clay brick waste aggregate. Dry density, water absorption, compressive strength, splitting tensile strength, flexural strength, and Ultrasonic Pulse Velocity (UPV) were among the properties of SCC that had been investigated. To achieve the purpose of this study, seven concrete mixes were prepared.SCC density, compressive strength, splitting tensile strength, flexural strength, and UPV are all increased with the increase of recycled steel fibers content in self-compacted concrete. Including different volume fractions and aspect ratios of scrap tire recycled steel fibers increased the compressive strength between 2.54% to 23%. The splitting tensile strength was about 5.6% to 13.9%, and the flexural strength increased from 1.6% to 14.8%. All GSCC mixes reinforced with STRSF show good performance according to the classification limits of SCC with high compressive strength, so these mixes are applicable for different weather conditions and construction projects.

Improvement of Soil by Waste Tires Addition

Falak O.Abas; Mohammed .O.Abass; Raghad.O.Abass; Shymaa K.G

Engineering and Technology Journal, 2011, Volume 29, Issue 16, Pages 3417-3428

Low able fill material is a self – leveling– compacting one; these types of material rapidly gain acceptance and application in construction utility earthworks. The use of scrap tires as a reinforcement element is an attractive solution that combines the
advantage of improving soil mechanical behavior with environmental concerns. The present work describes an experimental study on replacing sand aggregate grain size with wastes rubber and plastics at different mixing ratio (6, 18, 30) % wt. respectively to support technical feasibility of muddy soil by using wastes materials then compared with commercial additives (carbon fiber) afterward check their hydrodynamical
properties (E.L, P.L, hydrometer, compaction, and sp.gr) of prepared
compacting improved soil mixtures. Experimental results indicate that crumb rubber have successfully used to produce a light weight flow able fill ( 1.2 to 1.6 g/ cm3 ) than other additive waste plastic and carbon fiber based on the characteristic properties (E.L, P.L, hydrometer, compaction ) as follows:
Have 65% for rubber samples than other additives of 45% and 55% molecules respectively for hydrometer test, 2 Gs for rubber than 1Gs for other additives; and 560 g/cm3 compaction for rubber additive than 520 g/cm3 for other additives carbon fiber and waste plastic.

Optimization of Asphalt Mix Improved by the Addition of Scrap Tires

Raghad O. Abass; Mohammed O. Abass; Falak O. Abass

Engineering and Technology Journal, 2009, Volume 27, Issue 12, Pages 2425-2446

The design of improved asphalt mix is achieved by the use of three major
variables , weight of scrap tires replaced by coarse base aggregate , particles size of scrap tires finally the weight of binder used (bitumen). The improved asphalt mix (IAM) requires a balance between rut
resistance and durability to resist cracking and moisture damage (stripping) .Accordingly several factors that influence rut resistance and durability are considered during the design process: The mix consisted of binder (3.0-6.5) %wt. , scrap tires (10-30) wt% with
particle size of (1-5) cm , is achieved by the application of box-Wilson design program. The improved mix is achieved by the use of both hot (wet) and cold (dry) processes for preparing the standard mix firstly under high temperature 168˚C with a continuous mixing for 2 hours then mould this hot mixture in standard molder found with the replacement of a coarse percent of aggregate by the different sizes of scrap tires (1-5)cm by the use of cold ( dry) technique , finally a
compression step is achieved with 52 hut for 20 min for both sides of molder in order to compress the prepared specimens then leaved for 24 hrs from the stability of specimens before any tests applied .
The results of selected variables are studied for prepared specimens to
check different important properties (mechanical, physical, chemical, thermomechanical and thermo-physical properties), then applied these result properties data in analytical computer programme software to check its fitting to design model selected and calculated the optimum properties and optimum variables for improved asphalt mix. After-ward the computerize analysis results shows that an optimum mix No.(11) reached high stability and flexibility, also gave excellent physical and
chemical properties as shown in present work below. Also described in this work the application and comparison between standard and improved optimum asphalt mix.