RE-ASSESSMENT OF NEW ZEALAND’S ATMOSPHERIC CORROSIVITY
Author(s): Marston, N. J., Li, Z., M. S. and Shaw, P.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
Publication year: 2015
Total Pages: 8
Abstract: Atmospheric corrosivity maps are fundamental to the specification and selection of materials for buildings in different geographic regions to ensure that they meet the durability requirement of the performance based New Zealand Building Code. Recently, atmospheric corrosion testing has been conducted at thirty-six sites across New Zealand. The corrosion rates of mild steel and hot dip galvanised zinc coated steel coupons were measured after one year of exposure starting in late 2011. These were compared with results obtained in past BRANZ surveying from the 1980s. At a limited number of sites, obvious changes in mass loss rates were found for mild steel or for zinc. The mechanisms behind these changes have been examined, taking account of any changes in the New Zealand climate over the past three decades. No strong correlation has been found between the changes in individual climatic factors and the latest metal corrosion rate. Analysis of current data implies that the atmospheric corrosivity map shown in the key New Zealand Standard, NZS3604, might have limitations in some regions. Current research is looking further into zone boundary adjustments and to develop a reliable, updated atmospheric corrosivity map for cost-effective building and construction across New Zealand.
Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00