Mechanical behavior of reinforced concrete with waste-tire particles under an indirect tensile test
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.462
Mechanical behavior of reinforced concrete with waste-tire particles under an indirect tensile test Sandra L. Rodríguez R.1, Luis S. Hernández H. 2, Francisco G. Pérez-Gutiérrez.1 and Jorge H. Díaz A2 1
Faculty of Engineering, Autonomous University of San Luis Potosi, Av. Dr. Manuel Nava N°8, C.P. 78290, San Luis Potosi, S.L.P., Mexico
2
Metallurgy Institute, Autonomous University of San Luis Potosi, Sierra Leona N°550, C.P. 78210, San Luis Potosi, S.L.P., Mexico
ABSTRACT The incorporation of triturated tire particles as an aggregate in the concrete mixture is one of the ways to take advantage of this Waste Rubber (WR) in order to improve concrete properties, such as mechanical behavior. In this research we evaluated mechanical behavior of concrete specimens prepared with different amounts WR, which partially substituted the fine aggregate, under an indirect tensile test. In contrast with other’s researcher’s findings, our results show that the specimens with 5% WR present the highest value of indirect tensile strength (TP) of 4.36 MPa. Polynomial relationships between TP and compression strength (f´c), where Tp ranges from 0.1f´c to 0.2f´c. Specimens with the 0, 5 and 10% WR content show two types of failure: normal tension and tiple-cleft failure, described in the norm ASTM 1144-89. Nevertheless, specimens with 15 and 20% WR show a new failure not described in the norm, which is thought to be occurring due to the high amount of WR used.
INTRODUCTION Tire industry produces 1.4 million tires each year, which has become an environmental problem. Reuse of waste tires is an important point for scientific community in order to achieve a more sustainable society [1]. A current trend is to use triturated waste rubber (WR) from these tires as an aggregate in concrete mixture, seeking to improve its mechanical properties, without an increase in its cost at the same time that it is useful for structural applications. Adequate preparation of the mixture is of paramount importance to achieve this goal.
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Because compression is the most important load to a concrete element, among the relevant mechanical properties for concrete we find the compression strength (f’c) and indirect tensile strength (TP). The latter is important because its relation to cracking which occurs due to structural restrictions, volumetric expansion, and other factors related to durability. For conventional concrete, TP is often 10% of f’c. There are mathematical models that relate both of these mechanical properties. These models can be found in structural design norms, such as NTC [2], ACI 363-92 [3] and others [4,5,6,7]. Either conventional or WR concrete properties depend on the mixture design. For example: compression strength can be improved by
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