Neutron Radiography Based Visualization and Profiling of Water Uptake in (Un)cracked and Autonomously Healed Cementitious Materials

被引:31
作者
Van den Heede, Philip [1 ,2 ]
Van Belleghem, Bjorn [1 ,2 ]
Alderete, Natalia [1 ,3 ]
Van Tittelboom, Kim [1 ]
De Belie, Nele [1 ]
机构
[1] Univ Ghent, Fac Engn & Architecture, Dept Struct Engn, Magnel Lab Concrete Res, Technol Pk Zwijnaarde 904, B-9052 Ghent, Belgium
[2] Strateg Initiat Mat SIM Vzw, Project ISHECO, Program SHE, Technol Pk Zwijnaarde 935, B-9052 Ghent, Belgium
[3] Lab Multidisciplinary Training Technol Res, LEMIT, 52 Entre 121 & 122 S-N, RA-1900 La Plata, Buenos Aires, Argentina
关键词
neutron radiography; capillary water absorption; mortar; cracks; autonomous self-healing; encapsulated polyurethane; viscosity; POROUS BUILDING-MATERIALS; MOISTURE DISTRIBUTIONS; CAPILLARY TRANSPORT; CRACKED CONCRETE; ABSORPTION; TOMOGRAPHY; MORTARS; QUANTIFICATION; PERMEABILITY; PENETRATION;
D O I
10.3390/ma9050311
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Given their low tensile strength, cement-based materials are very susceptible to cracking. These cracks serve as preferential pathways for corrosion inducing substances. For large concrete infrastructure works, currently available time-consuming manual repair techniques are not always an option. Often, one simply cannot reach the damaged areas and when making those areas accessible anyway (e.g., by redirecting traffic), the economic impacts involved would be enormous. Under those circumstances, it might be useful to have concrete with an embedded autonomous healing mechanism. In this paper, the effectiveness of incorporating encapsulated high and low viscosity polyurethane-based healing agents to ensure (multiple) crack healing has been investigated by means of capillary absorption tests on mortar while monitoring the time-dependent water ingress with neutron radiography. Overall visual interpretation and water front/sample cross-section area ratios as well as water profiles representing the area around the crack and their integrals do not show a preference for the high or low viscosity healing agent. Another observation is that in presence of two cracks, only one is properly healed, especially when using the latter healing agent. Exposure to water immediately after release of the healing agent stimulates the foaming reaction of the polyurethane and ensures a better crack closure.
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页数:28
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