Title:
Repeatability of Self-Healing in Fiber Reinforced Concretes with and without Crystalline Admixtures: Preliminary Results
Author(s):
Estefanía Cuenca, Liberato Ferrara
Publication:
Symposium Paper
Volume:
319
Issue:
Appears on pages(s):
11.1-11.18
Keywords:
self-healing,” cracking-healing” fatigue, fiber reinforced concrete, durability, mechanical behavior, crystalline admixtures.
DOI:
10.14359/51700860
Date:
6/1/2017
Abstract:
This paper analyzes the repeatability of autogenous and engineered self-healing in fiber reinforced concrete (FRC) with and without crystalline admixtures. To this purpose, the tensile behavior of two different mixes, differing by pindirect testing methodology has been employed to the aforementioned purpose, i.e. Double Edge Wedge Splitting (DEWS) test. Three different exposure conditions were considered: open air exposure, water immersion and wet/dry cycles.
Specimens were pre-cracked up to a crack width of 0.25mm (0.01 in.) (precrack cycle). Then, specimens were healed for one month and tested again up to a crack width of 0.25mm (0.01 in.) (cycle after 1st healing). After that, specimens were healed for two months further (2nd healing) and finally, they were cracked once again up to 0.25mm (0.01 in.). The highest healing rate was reached for specimens immersed in water; moreover, as expectable, the larger the initial crack width, the lower is the percentage of crack closure. Regarding the repeatability, a general better trend was found for the mix with crystalline admixtures, in which, in addition, the maximum load regain was measured after the 2nd healing cycle rather than after the 1st healing.
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