Abstract
Neutron radiography was employed to observe and quantify water exchange between fresh and old cement mortars. The influence of the initial moisture conditions (dry, water-saturated, and partially saturated) in the old mortar on water exchange at the interfaces was studied. The dynamic water content profiles in the repair and old mortars were determined as a function of time. The time-dependence of the water infiltration depth in the old mortar was analyzed. A desorption coefficient was defined to describe the water loss rate for the repair mortar. The results indicated the prewetting of the old mortar significantly decelerated its extraction of water from the repair mortar. A reversal of water migration was even found after the casting of repair mortar onto a water-saturated old mortar for a period of time. In addition, visual and quantitative investigation was performed for the influence of cracks on water redistribution in repair and old mortars.
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