Journal
CEMENT AND CONCRETE RESEARCH
Volume 73, Issue -, Pages 17-24Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2015.02.021
Keywords
Microcracking [B]; Granulated blast-furnace slag [D]; Autogenous healing
Funding
- European Union [290308]
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Concrete can autogenously heal cracks potentially increasing construction durability. Studies quantifying this process are limited to fresh-water making the controlling parameters in sea-water unclear. Here we visually quantify the autogenous healing capacity of ordinary Portland cement (OPC) and blast-furnace slag (BFS) cement mortar specimens submerged in fresh- and sea-water. After 56 days, BFS cement specimens in sea-water healed 100% of cracks up to 104 pm, for OPC specimens it was 592 pm. In fresh-water, BFS cement specimens healed 100% of cracks up to 408 pm, while OPC specimens healed 100% of cracks up to 168 pm. Displaying greater healing efficiency OPC specimens in sea-water became weak, developing unacceptable losses in compressive strength. Differences in performance were attributed to the amount of calcium hydroxide in these mortars and specific ions present in sea-water. Visual crack-healing, therefore, should be assessed in conjunction with a material functional property. (C) 2015 Elsevier Ltd. All rights reserved.
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