A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Physical salt attack on concrete: mechanisms, influential factors and mitigation
Physical salt attack (PSA) is a key damage mechanism of concrete serving in salt-rich media under certain environments; yet, there is still lack of essential knowledge in the technical literature regarding different aspects of PSA. This thesis applied the response surface method to assess the influence of perspective- and performance-based parameters on PSA of 52 concrete mixtures. Also, the research program considered additional parameters that may alter the kinetics of PSA in service by adopting a holistic testing approach of concurrently exposing concrete to PSA and carbonation, simulating elements serving in heavy traffic and industrial zones. In addition, several surface treatments of concrete were tested/developed (nanocomposites) for mitigating PSA and also tested under salt-frost scaling to generalize their applicability. The results suggested limiting the water-to-binder ratio and binder content to a maximum and minimum of 0.40 and 400 kg/m3, respectively, regardless of the binder type. With extended curing, the use of fly ash or slag was beneficial at dosages below 25 and 30%, respectively, for binary binders and 35% for ternary blends combining both. Blended binders (28 to 35% replacement) comprising silica fume (≥ 8%) were capable of resisting severe PSA conditions. Mutual PSA and carbonation escalated the rate of surface scaling compared to single PSA. The wicking factor of concrete informatively captured the trends of damage for single and combined modes. Thermal, mineralogical, and microscopy analyses elucidated the coexistence of complex degradation processes in concrete subjected to combined PSA and carbonation, which was fundamentally different from salt crystallization in case of single PSA. Epoxy, ethyl silicate, and acrylic emulsion coatings protected concrete from PSA. Colloidal nano-silica (50% concentration) minimized PSA and salt-frost scaling. Silane mixed with 5% nano-clay or nano-silica mitigated PSA and salt-frost scaling damage of sound and pre-cracked concrete, with relatively ...
Physical salt attack on concrete: mechanisms, influential factors and mitigation
Physical salt attack (PSA) is a key damage mechanism of concrete serving in salt-rich media under certain environments; yet, there is still lack of essential knowledge in the technical literature regarding different aspects of PSA. This thesis applied the response surface method to assess the influence of perspective- and performance-based parameters on PSA of 52 concrete mixtures. Also, the research program considered additional parameters that may alter the kinetics of PSA in service by adopting a holistic testing approach of concurrently exposing concrete to PSA and carbonation, simulating elements serving in heavy traffic and industrial zones. In addition, several surface treatments of concrete were tested/developed (nanocomposites) for mitigating PSA and also tested under salt-frost scaling to generalize their applicability. The results suggested limiting the water-to-binder ratio and binder content to a maximum and minimum of 0.40 and 400 kg/m3, respectively, regardless of the binder type. With extended curing, the use of fly ash or slag was beneficial at dosages below 25 and 30%, respectively, for binary binders and 35% for ternary blends combining both. Blended binders (28 to 35% replacement) comprising silica fume (≥ 8%) were capable of resisting severe PSA conditions. Mutual PSA and carbonation escalated the rate of surface scaling compared to single PSA. The wicking factor of concrete informatively captured the trends of damage for single and combined modes. Thermal, mineralogical, and microscopy analyses elucidated the coexistence of complex degradation processes in concrete subjected to combined PSA and carbonation, which was fundamentally different from salt crystallization in case of single PSA. Epoxy, ethyl silicate, and acrylic emulsion coatings protected concrete from PSA. Colloidal nano-silica (50% concentration) minimized PSA and salt-frost scaling. Silane mixed with 5% nano-clay or nano-silica mitigated PSA and salt-frost scaling damage of sound and pre-cracked concrete, with relatively ...
Physical salt attack on concrete: mechanisms, influential factors and mitigation
2020-09-08
Theses
Electronic Resource
English
Thaumasite sulfate attack on concrete: Mechanisms, influential factors and mitigation
| Online Contents | 2014
Physical Salt Attack on Concrete
| Online Contents | 2011
Permeability of Concrete: Influential Factors
| British Library Conference Proceedings | 1993
Physical salt attack on concrete incorporating nano-silica
| Taylor & Francis Verlag | 2017
Response of concrete to accelerated physical salt attack exposure
| Elsevier | 2016