Skip to main content

G.D. Wight1 and J.M. Ingham2

  1. PhD Student, Dept of Civil and Environmental Engineering, University of Auckland, Private Bag 92019, Auckland, New Zealand, gwig003@ec.auckland.ac.nz
  2. Senior Lecturer, Dept of Civil and Environmental Engineering, University of Auckland, j.ingham@auckland.ac.nz

ABSTRACT

Time-dependent prestress losses due to creep and shrinkage lead to a reduction in structural efficiency in post-tensioned concrete masonry walls. This paper investigates the magnitude of creep and shrinkage that can be expected from medium-weight concrete masonry units manufactured in New Zealand. The findings from a creep and shrinkage experiment, lasting approximately two years, are presented and compared with test data from other researchers and values stipulated in international standards. A creep coefficient of 3.0 is found, a value in agreement with the Australian, British and Canadian standards. Shrinkage strains of 1000 microstrain and 600 microstrain for grouted and ungrouted walls respectively, were obtained under laboratory conditions.

KEYWORDS: prestress losses, post-tensioned, concrete masonry, creep, shrinkage.

5c-2

Get in touch with our team

The Canada Masonry Design Centre helps members of the design community across the country by connecting them to the resources and supports they need. Contact us today and get the conversation started!

Contact Us