Comments on the shrinkage of paste in mortar containing saturated lightweight aggregate

Title: Comments on the shrinkage of paste in mortar containing saturated lightweight aggregate
Author(s): R. Henkensiefken, G. Sant, T. Nantung, J. Weiss
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 707 - 714
Total Pages: 8
Nb references: 16
Language: English

Abstract: Recently, there has been an increase in the desire to use saturated lightweight aggregates (LWA) to reduce shrinkage and shrinkage cracking in low w/c concrete. The use of saturated LWA as a method to provide internal curing involves the partial replacement of normal weight aggregate with saturated LWA. The saturated LWA provides additional water that can replenish the paste to compensate for the effects of self-desiccation. This paper uses Pickett’s model to determine the shrinkage of the cement paste portion of a mortar containing different volumes of saturated LWA. The results of the study indicate that while the inclusion of saturated LWA reduces the stiffness of the mortar, the reduction in shrinkage of the paste due to the supply of additional water is more crucial in reducing the overall shrinkage of the mortar. The size of the pores emptied due to self-desiccation is calculated using results from internal relative humidity measurements and are compared with mercury intrusion porosimetry test data. Similar pore sizes are observed with both methods.

Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00