Evaluation of test methods for self-healing concrete with macrocapsules by inter-laboratory testing / Tim Van Mullem [et al.], Marta Dudek, Arkadiusz Kwiecien [et al.], Teresa Stryszewska [et al.] // W: ... więcej

Evaluation of test methods for self-healing concrete with macrocapsules by inter-laboratory testing / Tim Van Mullem [et al.], Marta Dudek, Arkadiusz Kwiecien [et al.], Teresa Stryszewska [et al.] // W: International Conference Resilient Materials 4 Life 2020 (RM4L2020), 20-22 September 2021, online : conference proceedings [Dokument elektroniczny] / ed. by R. Maddalena, M. Wright-Syed. – Cardiff, UK : Cardiff University, 2021. – S. 180-185 : tab., wykr. – Tryb dostępu: https://orca.cardiff.ac.uk/145287/1/RM4L2020%20Conference%20Proceedings%20-%20Online%20Version.pdf. – Bibliogr. 6 poz., Abstr. – Tyt. źródła wg s. tyt. – Data wyd. wg daty cop. – Inf. o dodatkowych materiałach: Raw data and supplementary material of the fifth inter-laboratory testing program [...], DOI: 10.5281/zenodo.3865635. – ISBN 978-1-3999-0832-0

Self-healing of concrete is a promising way to increase the service life of structures. Innovative research is being performed, yet it is difficult to compare results due to a lack of standardised test ... więcej

Self-healing of concrete is a promising way to increase the service life of structures. Innovative research is being performed, yet it is difficult to compare results due to a lack of standardised test methods. In the framework of the COST action SARCOS (CA15202) [1] six different interlaboratory tests are being executed, in which different test methods are being evaluated for six self-healing approaches. Here, the results of the inter-laboratory test concerning mortar and concrete with macrocapsules filled with a polyurethane healing agent will be discussed. The specimens were manufactured in one laboratory and then shipped to the other five participating laboratories. All six laboratories evaluated two test methods: a water permeability test and a capillary water absorption test. For the water permeability test, mortar specimens were cracked and afterwards their crack width was controlled using an active control technique. Due to the active crack control, the crack width of 90% of the samples deviated by less than 10 µm from the target of 300 µm. This made it more straightforward to compare the permeability test results, which indicated a similar sealing efficiency for several of the laboratories. For the capillary water absorption test, concrete specimens were cracked in a crack-width-controlled three-point bending test setup without active control after unloading. Compared to the water permeability specimens, there was a lot more variation on the crack width of the capillary water absorption specimens. The variability on the crack width and differences in quality of waterproofing resulted in diverging findings in the capillary water absorption test.