title: Sustainable construction: composite use of tyres and ash in concrete.
abstract: An investigation was carried out to establish the physical, mechanical and chemical characteristics of a non-standard (unprocessed) pulverised fuel ash (PFA) and waste tyres from a former landfill site at the Power Station Hill near Church Village, South Wales, United Kingdom. Investigations are on-going to establish the suitability of the fly ash and/or tyres in road construction (embankment and pavement) and also in concrete to be used in the construction of the proposed highway. This paper reports on concrete-based construction where concrete blends (using various levels of PFA as partial replacement for Portland cement (PC), and shredded waste tyres (chips 15-20mm) as aggregate replacement) were subjected to unconfined compressive strength tests to establish performance, hence, optimising mix designs. Strength development up to 180 days for the concrete made with PC-PFA blends as binders (PC-PFA concrete), with and without aggregate replacement with tyre chips, is reported. The binary PC-PFA concrete does not have good early strength but tends to improve at longer curing periods. The low early strength observed means that PC-PFA concrete cannot be used for structures, hence, only as low to medium strength applications such as blinding, low-strength foundations, crash barriers, noise reduction barriers, cycle paths, footpaths and material for pipe bedding.
authors.affiliation: Faculty of Advanced Technology, University of Glamorgan, Llantwit Road, Trefforest, Pontypridd, Rhondda Cynon Taff, South Wales, CF37 1DL, United Kingdom. dgsnelso@glam.ac.uk
authors.forename: D G
authors.initials: DG
authors.lastname: Snelson
authors.forename: J M
authors.initials: JM
authors.lastname: Kinuthia
authors.forename: P A
authors.initials: PA
authors.lastname: Davies
authors.forename: S-R
authors.initials: SR
authors.lastname: Chang
mesh_terms: D002244:Carbon; D060729:Coal Ash; D003247:Conservation of Natural Resources / Q000379:methods*; D003252:Construction Materials; D008855:Microscopy, Electron, Scanning; D052638:Particulate Matter; D012037:Refuse Disposal / Q000379:methods; D012408:Rubber; D014866:Waste Products
chemical_list: D060729:Coal Ash; D052638:Particulate Matter; D014866:Waste Products; D002244:Carbon; D012408:Rubber