Detecting Solidification Using Moisture Transport from Saturated Lightweight Aggregate


  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


Title: Detecting Solidification Using Moisture Transport from Saturated Lightweight Aggregate

Author(s): R. Henkensiefken, G. Sant, T. Nantung, and J. Weiss

Publication: Symposium Paper

Volume: 259


Appears on pages(s): 77-88

Keywords: chemical shrinkage; internal curing; lightweight aggregate; setting; solidification; x-ray absorption

Date: 2/1/2009

The propensity for early-age shrinkage cracking in low w/c concretes has spawned the development of new technologies that can reduce the risk of cracking. One such technology is internal curing. Internal curing uses saturated lightweight aggregate to supply ‘curing water’ to low w/c paste as it hydrates. Significant research has been performed to determine the effects of internal curing on shrinkage and stress development in sealed samples. However, relatively little detailed information exist about how water is released from the lightweight aggregate to the surrounding cement paste. This study examines the timing of moisture release from saturated lightweight aggregate (LWA). Specifically this paper focuses on fluid transport around the time of set. X-ray absorption is used to trace the time at which water moves from the lightweight aggregate to the paste. X-ray observations are compared with results from the Vicat needle, autogenous shrinkage, and acoustic emission tests. These results are contextualized in terms of structure formation and vapor space cavitation in the cement paste.


Please enter this 5 digit unlock code on the web page.