1. Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules
- Author
-
Van Mullem, Tim, Anglani, Giovanni, Dudek, Marta, Vanoutrive, Hanne, Bumanis, Girts, Litina, Chrysoula, Kwiecień, Arkadiusz, Al-Tabbaa, Abir, Bajare, Diana, Stryszewska, Teresa, Caspeele, Robby, Van Tittelboom, Kim, Jean-Marc, Tulliani, Gruyaert, Elke, Antonaci, Paola, De Belie, Nele, Van Mullem, Tim [0000-0003-0657-8893], Anglani, Giovanni [0000-0003-1656-6319], Dudek, Marta [0000-0003-0658-6922], Vanoutrive, Hanne [0000-0003-0356-8307], Bumanis, Girts [0000-0002-6617-0120], Litina, Chrysoula [0000-0002-8020-7524], Kwiecień, Arkadiusz [0000-0002-6169-5585], Al-Tabbaa, Abir [0000-0002-5746-6886], Bajare, Diana [0000-0002-3250-5594], Stryszewska, Teresa [0000-0003-1984-4425], Caspeele, Robby [0000-0003-4074-7478], Van Tittelboom, Kim [0000-0002-7718-3189], Jean-Marc, Tulliani [0000-0003-2419-4383], Gruyaert, Elke [0000-0003-0117-2544], Antonaci, Paola [0000-0002-3146-9106], De Belie, Nele [0000-0002-0851-6242], and Apollo - University of Cambridge Repository
- Subjects
Waterproofing ,Absorption (acoustics) ,Technology and Engineering ,Materials science ,Round robin test ,02 engineering and technology ,Bending ,CRACKS ,010402 general chemistry ,01 natural sciences ,water permeability ,self-healing concrete ,Focus on Self-Healing Materials ,mental disorders ,ABSORPTION ,WATER ,General Materials Science ,Composite material ,SUPERABSORBENT POLYMERS ,Materials of engineering and construction. Mechanics of materials ,REPAIR ,standardization ,CEMENT-BASED MATERIALS ,Round robin test, self-healing concrete, standardization, macrocapsules, polyurethane, capillary water absorption, water permeability, active crack width control technique, machine learning ,capillary water absorption ,600 Others Self-healing concrete ,PERFORMANCE ,021001 nanoscience & nanotechnology ,Durability ,macrocapsules ,0104 chemical sciences ,Permeability (earth sciences) ,machine learning ,polyurethane ,Self-healing ,TA401-492 ,VISUALIZATION ,active crack width control technique ,Mortar ,0210 nano-technology ,TP248.13-248.65 ,Research Article ,Biotechnology - 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. ispartof: Science And Technology Of Advanced Materials vol:21 issue:1 pages:661-682 ispartof: location:United States status: Published online
- Published
- 2020