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The Pamphlet Collection of Sir Robert Stout: Volume 66

Materials for Portland Cement

Materials for Portland Cement.

The manufacture of Portland cement might be made an important industry in New Zealand, excellent chalk and lime and non-ferruginous clay being obtainable.

The Italian pozzuolana might be imitated also, as there are extensive deposits of volcanic tufas occurring in the North and South Islands. Those volcanic sands would require then to be ground up with an admixture of lime, making, when correctly proportioned, an excellent hydraulic mortar. In Auckland an artificial cement is largely in use, prepared from hydraulic lime from the Tertiary strata at Mahurangi, which, when properly mixed with scoria dust, forms a most valuable cement for concrete buildings, and also for submarine walls and docks. Artificial cement works are in process of establishment in Whangarei, New Plymouth, Collingwood, and in Canterbury and Otago at places where the natural supply of material occurs under favourable circumstances.