Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : scrap tires

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 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.