Abrasion resistance of sustainable green concrete containing waste tire rubber particles

The development of new environmental friendly concretes such as rubberized concrete is being promoted due to the environmental problems created by the waste tire rubber. Every year millions of tires are discarded, thrown away or buried all over the world, representing a very serious threat to the ecology. In this study, we analyse the potential of waste tire rubber particles as a partial substitute for fine aggregates in normal strength and high strength cement concrete and the resistance to abrasion has been measured. Statistical Analysis was carried out to strengthen the results obtained from experiments. The results show that the use of tire rubber particles can improve the abrasion resistance of concrete, and this can ensure its applications in pavements, floors and concrete highways, or in places where there are abrasive forces between surfaces and moving objects. (C) 2016 Elsevier Ltd. All rights reserved

Part III: A Tribute to Philippe Lejeune

A Festschrift for Philippe Lejeun

The retention system:reconciling variable retention with the principles of silvicultural systems

The philosophy of ecosystem management seeks a balance between protecting natural systems and using them to meet societal demands. The objectives of silvicultural systems listed in standard texts focus on the sustained production of timber and maintenance of quality growing stock. These objectives need updating for situations where the broader goal is to sustain ecosystem function and productivity. The "retention system" recently adopted in British Columbia is a silvicultural system designed to implement the "variable retention" (VR) approach to harvesting. With VR, trees are retained to meet ecological objectives such as maintaining structural heterogeneity and protecting biological legacies. The contribution of retained trees to yield or regeneration may be low or even negative. Among the challenges in implementing the retention system is the adjustment of yield expectations and target stand projections to account for the expected health and vigour of the future stand.https://viuspace.viu.ca/bitstream/handle/10613/2698/Beese.Retention.pdf?sequence=7This is an electronic version of an article published as: Mitchell, S.J. & Beese, W.J. (2002). "The retention system: Reconciling variable retention with the principles of silvicultural systems." The Forestry Chronicle, 78(3), 397‐403. The Forestry Chronicle is available online at: http://pubs.cif-ifc.org/journal/tfc and this article is available at: http://pubs.cif-ifc.org/doi/abs/10.5558/tfc78397-