Pre-hydration as a technique for the retardation of Roman cement mortars

STARINIERI, V., HUGHES, D.C., GOSSELIN, C., WILK, D. and BAYER, K. (2013). Pre-hydration as a technique for the retardation of Roman cement mortars. Cement and Concrete Research, 46, 1-13.

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The setting of Roman cement is so rapid as tomake the use of retardation essential inmost practicalmortars. This work reports an approach to retardation of Roman cementmortars by means of a pre-hydration process in which pre-determined amounts of water (de-activation water) are added to the cement prior to subsequentmortar formation. It is shown that this process yields bothmonocarboaluminate and a carbonated AFm phase, the balance of which is modified by storage time; the belite phases are not affected. Increases in both de-activation water and pre-hydratedmix storage time yield a longer workable life and slightly lower strength of the mortar. An increase in de-activation water also yields an increase in shrinkagewhilst an increase in storage time results ina reduction in shrinkage. Other parameters such asmixing protocol and re-mixing affect workable life without compromising the strength.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Infrastructure Management
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Page Range: 1-13
Depositing User: Helen Garner
Date Deposited: 30 Apr 2013 10:47
Last Modified: 18 Mar 2021 19:45

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