CUED Publications database

Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules

Van Mullem, T and Anglani, G and Dudek, M and Vanoutrive, H and Bumanis, G and Litina, C and Kwiecień, A and Al-Tabbaa, A and Bajare, D and Stryszewska, T and Caspeele, R and Van Tittelboom, K and Jean-Marc, T and Gruyaert, E and Antonaci, P and De Belie, N (2020) Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules. Science and Technology of Advanced Materials, 21. pp. 661-682. ISSN 1468-6996

Full text not available from this repository.

Abstract

Development and commercialization of self-healing concrete is hampered due to a lack of standardized test methods. Six inter-laboratory testing programs are being executed by the EU COST action SARCOS, each focusing on test methods for a specific self-healing technique. This paper reports on the comparison of tests for mortar and concrete specimens with polyurethane encapsulated in glass macrocapsules. First, the pre-cracking method was analysed: mortar specimens were cracked in a three-point bending test followed by an active crack width control technique to restrain the crack width up to a predefined value, while the concrete specimens were cracked in a three-point bending setup with a displacement-controlled loading system. Microscopic measurements showed that with the application of the active control technique almost all crack widths were within a narrow predefined range. Conversely, for the concrete specimens the variation on the crack width was higher. After pre-cracking, the self-healing effect was characterized via durability tests: the mortar specimens were tested in a water permeability test and the spread of the healing agent on the crack surfaces was determined, while the concrete specimens were subjected to two capillary water absorption tests, executed with a different type of waterproofing applied on the zone around the crack. The quality of the waterproofing was found to be important, as different results were obtained in each absorption test. For the permeability test, 4 out of 6 labs obtained a comparable flow rate for the reference specimens, yet all 6 labs obtained comparable sealing efficiencies, highlighting the potential for further standardization.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 29 Aug 2020 20:21
Last Modified: 15 Apr 2021 05:37
DOI: 10.1080/14686996.2020.1814117