Metro Testing Laboratories Ltd. -MTL- was asked by Task Construction Management to carry out a series of high flyash replacement concrete mixture designs for use on the Whistler Convention Centre. The owners of the building wanted the project to qualify as a “green” project. To this end MTL carried out tests to determine the compressive strength gain setting time and bleeding characteristics of a series of high-volume flyash concrete mixtures. The flyash contents investigated ranged from about 30% to 60% flyash by mass of total cementing materials. The mixtures were designed for a Class N exposure condition ie. interior concrete not exposed to moisture chlorides or freezing and thawing in service. A small amount of entrained air was added to most of the mixtures to provide additional plasticity to the mixtures and reduce bleeding.
Case Study Report Author: Metro Materials Testing and Engineering Services
This report details the first time use of EcoSmart concrete by the project team members in renovating the Whistler Conference Centre a concrete building located in Whistler British Columbia. The re-construction included the use of EcoSmart concrete in slab on grade at the 35% cement replacement level increasing to 40%replacement level in suspended slab once the project team gained more confidence in working with EcoSmart concrete. The Conference Centre project is registered with LEEDâ„¢ -in Energy and Environmental Design- and the teamâ€™s goal was to achieve a â€œGoldâ€ certified status for the project. High on the priority list was to reconstruct the building with as many types of materials that were either salvaged from other areas or building products that contained a high recycled content of materials recovered from consumer or industrial waste streams. Initial concerns with using EcoSmart concrete included cool construction temperatures permeability of the concrete in vertical elements and pumpability and workability of the concrete in slabs. Overall the teamâ€™s experience with EcoSmart concrete was very positive and project members were pleased with the concreteâ€™s strength development workability finishability appearance and cost.
Case Study Report Author: Susan Hildebrand
This report is an appendix to the EcoSmart Project s Metakaolin Feasibility Study. Syncrude Canada Ltd has initiated a project to recover a kaolin rich slurry from oil sands tailings. The recovered product has been identified as a potential pozzolanic supplement in specialty cements. This report describes the laboratory and pilot plant work which produced a bulk sample of slurry. The slurry sample was sent to ECC in Georgia for calcining and product evaluation.
The report also contains a description and cost estimate of a commercial plant to generate the initial annual quantity of product required by ECC.
Technical Report Author: Tynebridge Technologies Ltd
This report is an appendix to the EcoSmart Concrete Project s Metakaolin Study. The report presents INSA s technical economical and environmental analysis of the report prepared for EcoSmart by NLK consultants.
The report concludes that NLK s arguments are acceptable but have to be verified by a pilot-scale production of metakaolin in a multiple-hearth furnace then supplied to ready mix concrete plants to determine industrial acceptability.
Technical Report Author: Jean Pera
This report is an appendix to the EcoSmart Project s Metakaolin Study. The report presents the results of NLK s metakaolin pre-feasibility review of the potential for developing metakaolin from the oil sands operations for use in concrete as a supplementary cementing material. The report covers the technical economic and environmental aspects of recovering and converting kaolin to metakaolin and of using metakaolin as a SCM.
The report concludes that metakaolin produced from the oil sands tailings is comparable to silica fume as an additive and is about 85-90% as reactive as commercially available metakaolin. It is technically viable for use as an SCM in concrete although its slight colouration precludes some uses. A precondition to considering the viability of extracted metakaolin is that it can be supplied at a low enough cost to provide economic benefits to ready mix concrete suppliers with resulting demand that it is adequate to justify an extraction plant.
Technical Report Author: NLK Consultants Inc.