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

Tim Van Mullem, Giovanni Anglani, Marta Dudek, Hanne Vanoutrive, Girts Bumanis, Chrysoula Litina, Arkadiusz Kwiecień, Abir Al-Tabbaa, Diana Bajare, Teresa Stryszewska, Robby Caspeele, Kim Van Tittelboom, TullianiJean-Marc, Elke Gruyaert, Paola Antonaci & Nele De Belie

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 speci-mens 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.

Reference of this article: Tim Van Mullem, Giovanni Anglani, Marta Dudek, Hanne Vanoutrive, Girts Bumanis, Chrysoula Litina, Arkadiusz Kwiecień, Abir Al-Tabbaa, Diana Bajare, Teresa Stryszewska, Robby Caspeele, Kim Van Tittelboom, Tulliani Jean-Marc, Elke Gruyaert, PaolaAntonaci & Nele De Belie (2020) Addressing the need for standardization of test methods forself-healing concrete: an inter-laboratory study on concrete with macrocapsules, Science andTechnology of Advanced Materials, 21:1, 661-682,
DOI: 10.1080/14686996.2020.1814117

Keywords: Round robin test, self-healing concrete, standardization, macrocapsules, polyurethane, capillary water absorption, water permeability, active crack width control technique, machine learning

Affiliations:

Tim Van Mullem, Robby Caspeele, Kim Van Tittelboom & Nele De Belie: Magnel-Vandepitte Laboratory for Structural Engineering and Building Materials, Ghent University, Belgium

Giovanni Anglan, Paola Antonacii: Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Turin, Italy and Responsible Risk Resilience Centre, Politecnico di Torino, Turin, Italy

Marta Dudek, Arkadiusz Kwiecień, Teresa Stryszewska: Faculty of Civil Engineering, Cracow University of Technology, Cracow, Poland

Hanne Vanoutrive, Elke Gruyaert: Department of Civil Engineering, KU Leuven, Belgium

Girts Bumanis, Diana Bajare: Department of Building Materials and Products, Institute of Materials and Structures, Faculty of Civil Engineering, Riga Technical University, LV-Riga, Latvia

Chrysoula Litina, Abir Al-Tabbaa: Department of Engineering, University of Cambridge, Cambridge, UK

Tulliani Jean-Marc: INSTM Research Unit PoliTO-LINCE Laboratory, Department of Applied Science and Technology, Politecnico di Torino, Turin, Italy

This email address is being protected from spambots. You need JavaScript enabled to view it.

The full article can be found here: https://doi.org/10.1080/14686996.2020.1814117

 

We use cookies on our website. Some of them are essential for the operation of the site, while others help us to improve this site and the user experience (tracking cookies). You can decide for yourself whether you want to allow cookies or not. Please note that if you reject them, you may not be able to use all the functionalities of the site.