Properties of High Volume Fly Ash Wall Concrete: Combined Phase I and Phase II Report

The Greater Vancouver Regional District -GVRD- is constructing a 38.5 million gallon reservoir at Little Mountain Vancouver. The Project is known as the Little Mountain Reservoir Reconstruction -LMRR- . The use of EcoSmart concrete at the LMRR demonstrates that this type of concrete is ideal for large infrastructure projects. The resulting wall concrete evaluated here had in excess of 35% fly ash replacement for portland cement resulting in significant GHG reductions at no premium cost.

The concrete had excellent workability resulting in corresponding excellent surface finishes. It was readily pumped and consolidated even at slumps that would be considered low for the wall configuration. High durability necessary for the 100 year design service life was demonstrated by low porosity and permeability in concrete tests. In addition the concrete’s high resistivity will assist in long term passivation of the reinforcing steel from corrosion. As is typical of concretes containing higher fly ash replacements slower setting times and lower early age strength resulted. However the in-situ strength of the semi-massive walls concrete was adequate to achieve conventional formwork stripping schedules. Finally use of EcoSmart concrete achieved relatively low shrinkage which resulted in crack-free walls and supported control joints at larger than normal spacings.

Case Study Report Author: Levelton Consultants Ltd

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