Title: Numerical Modeling of Alkali-Activated Slag Concrete Beams Subjected to Restrained Shrinkage

Author(s): Frank Collins and Jay G. Sanjayan

Publication: Materials Journal

Volume: 97

Issue: 5

Appears on pages(s): 594-602

Keywords: alkali-activated slag; cracking (fracturing); ground-granulated blast-furnace slag; numerical modeling; shrinkage

DOI: 10.14359/9292

Date: 9/1/2000

Abstract:
Drying shrinkage of alkali-activated slag concrete (AASC) is higher than that of ordinary portland cement concrete (OPCC). AASC, however, has lower elastic modulus, higher creep, and higher tensile strength than OPCC, and these combined effects can reduce the cracking tendency. This paper describes the development of a numerical modeling of the behavior of restrained beams as a method towards understanding the relative contributions of parameters towards the risk of cracking. A stress-based model was developed, with a numerical solution obtained using a step-by-step method with small time increments. The numerical model results are compared with experimental results obtained from restrained beams. Reasonable estimation of time-to-cracking was achieved with the numerical model. The cracking tendency of different concrete types was ranked.