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Abstract
Utilizing waste materials as an alternative to using virgin construction materials, made fi’om nonrenewable resources, in civil engineering applications is currently one of the most important environmental issues. The unique properties of tire shreds such as light weight, strength, high fiictional resistance and flexibility can• be exploited in a beneficial manner. in geotechnical applications.
The tire shreds used in this study are originated fi’om the production lines of Alexandria Corporation for Transportation and Engineering. The tires factory in this corporation produces each year about 18 tons of shredded tires as wasted useless byproduct resulted fi’om the production process. The reuse of theses shredded tires in geotechnical applications helps making the most of them in a beneficial manner, for both the suppliers and the civil engineers.
The aim of this research is to examine the benefits of using tire shreds as lightweight inclusion to improve the bearing capacity and control the settlement of sandy soil and to explore the feasibility of using this type of reinforcement in practical applications through an experimental testing program. Also, the study investigates the mechanical properties of soil reinforced with tire shreds. The applied testing program is divided into four main phases.
In the first phase, standard laboratory tests are conducted in order to examine the geotechnical properties of tire shreds-sand mixtures (TSSM). The investigated properties included sand and tire shreds size and gradation, specific gravity, compaction characteristics, and shear strength parameters.
The second phase of this experimental program consists of a series of laboratory loading tests on a strip footing model overlying a mixture of tire shreds and sand. The model footing was loaded till failure and the load - displacement relation of the footing• was monitored.The third phase of the experimental program examined the feasibility of using a mixture of tire shreds and sand in highway engineering as base or sub-base materials through series of CBR and proctor tests.
The fourth, and the last phase of the experimental program, is dealing with the shear strength of (TSSM). Standard triaxial compression tests were performed on pure sand and (TSSM) specimens in order to determine the shear parameters and. to evaluate the reinforcing effect of tire shreds inclusions.