Abstract
This paper presents results of a study into the effects of truck tyre crumb rubber particle size, as fine aggregate, on the compressive strength, shrinkage and creep behaviour of structural rubberised concrete. The study is motivated by a growing interest in the use of concrete with waste tyre rubber particles, rubberised concrete, for structural applications. Three tyre crumb rubber sizes (2.36, 1.18 and 0.425 mm) were used to replace 10% by volume of fine mineral aggregates to produce concrete with a target strength of 30 MPa. The concrete was cast water-cured for 28 days and tested for shrinkage and creep for 180 days. Half of the shrinkage and creep samples were sealed with a bitumen seal to prevent drying during testing. Results show a general a decrease in compressive strength with reduction in crumb rubber size. The strength decreases by 22%, 23% and 27% for the 2.36, 1.18 and 0.425 mm mix respectively. Preliminary results show a general increase in both shrinkage and creep deformations in both drying and sealed conditions. The observed increases were checked against the limits provided in design codes to assess the applicability of the material for structural purposes.
Highlights
Concrete is one of the most extensively used construction material in the world and the mineral aggregates used to make the concrete are a finite resource, which is fast dwindling
Efforts have been made to limit the reduction in the mechanical performance of rubberised concrete by pretreating the rubber aggregate and making use of different binder types, like magnesium oxychloride cement and cements with supplementary cementitious materials (SCMs) (Fly ash and Silica fume) [13 – 16]
Though the cut-off sizes for each group differ, authors generally agree on three classes of waste tyre rubber particles [13, 23]
Summary
Concrete is one of the most extensively used construction material in the world and the mineral aggregates used to make the concrete are a finite resource, which is fast dwindling. Efforts have been made to limit the reduction in the mechanical performance of rubberised concrete by pretreating the rubber aggregate and making use of different binder types, like magnesium oxychloride cement and cements with supplementary cementitious materials (SCMs) (Fly ash and Silica fume) [13 – 16]. Pelliser et al [17] made a 48 MPa strength rubberised concrete, with 10% crumb rubber to fine mineral aggregate replacement by volume and a 15% silica fume-cement replacement at a water-to-binder ratio of 0.4 concrete mix. The full utilisation of rubberised concrete as a structural material in construction is only possible when its shrinkage and creep behaviour is sufficiently appreciated. This study aims to quantify the effects of crumb tyre rubber on shrinkage and creep deformation of structural concrete
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