The Potential Use of Natural Pozzolans in British Columbia as Supplementary Cementing Materials

Based on a review of existing information the team examined the technical environmental and economic benefits and costs of using naturally pozzolanic materials from provincial deposits as compared with those associated with the use of fly ash from coal-fired thermal electrical power plants as a supplementary cementing material in British Columbia. Based on their findings the team concludes that there is no indication that the natural pozzolans from any of the identified sources in British Columbia have any apparent technical advantage relative to the fly ashes being imported into the province and used as portland cement replacement materials. Further in terms of the present supplementary cementing materials market in British Columbia there would be no environmental benefit derived from using a natural pozzolan instead of fly ash. Finally the delivered cost of a natural pozzolan suitable for use as a supplementary cementing material will be of the same order of magnitude but possibly higher than the price of fly ash in the Greater Vancouver Area market.

Consequently it is recommended that no further investigation of this issue be carried out by the EcoSmartâ„¢ Concrete Project until it can be demonstrated that there is a demand for portland cement replacement materials in the province that cannot be satisfied by the importation of fly ash form Washington State and/or Alberta at an acceptable cost.

Technical Report Author: Robert Gray, Ph.D., P.Eng., James Atwater, P.Eng., W. Dunbar, Ph.D., P.Eng., CMP Technologies Ltd.,