Abstract
Carbonation is an important deleterious proceß for concrete structures. Carbonation begins when carbon dioxide (CO2) present in the atmosphere reacts with portlandite producing calcium carbonate (CaCO3). In severe carbonation conditions, C-S-H gel is decomposed into silica gel (SiO2.nH2O) and CaCO3. As a result, concrete pore water pH decreases (usually below 10) and eventually steel reinforcing bars become unprotected from corrosion agents. Usually, the carbonation of the cementing matrix reduces the porosity, because CaCO3 crystals (calcite and vaterite) occupy more volume than portlandite. In this study, an accelerated carbonation-ageing proceß is conducted on Portland cement mortar samples with water to cement ratio of 0.5. The evolution of the carbonation proceß on mortar is monitored at different levels of ageing until the mortar is almost fully carbonated. A nondestructive technique based on nonlinear acoustic resonance is used to monitor the variation of the constitutive properties upon carbonation. At selected levels of ageing, the compreßive strength is obtained. From fractured surfaces the depth of carbonation is determined with phenolphthalein solution. An image analysis of the fractured surfaces is used to quantify the depth of carbonation. The results from resonant acoustic tests revealed a progreßive increase of stiffneß and a decrease of material nonlinearity.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher | SPIE |
| Volume | 9438 |
| ISBN (Print) | 9781628415414 |
| DOIs | |
| State | Published - 2015 |
| Event | Health Monitoring of Structural and Biological Systems 2015 - San Diego, United States Duration: Mar 9 2015 → Mar 12 2015 |
Other
| Other | Health Monitoring of Structural and Biological Systems 2015 |
|---|---|
| Country | United States |
| City | San Diego |
| Period | 3/9/15 → 3/12/15 |
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Keywords
- Carbonation
- Cement based materials
- Nondestructive test
- Nonlinear acoustic
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Monitoring accelerated carbonation on standard Portland cement mortar by nonlinear resonance acoustic test. / Eiras, J. N.; Kundu, Tribikram; Popovics, J. S.; Monzó, J.; Borrachero, M. V.; Payá, J.
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9438 SPIE, 2015. 94380D.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Monitoring accelerated carbonation on standard Portland cement mortar by nonlinear resonance acoustic test
AU - Eiras, J. N.
AU - Kundu, Tribikram
AU - Popovics, J. S.
AU - Monzó, J.
AU - Borrachero, M. V.
AU - Payá, J.
PY - 2015
Y1 - 2015
N2 - Carbonation is an important deleterious proceß for concrete structures. Carbonation begins when carbon dioxide (CO2) present in the atmosphere reacts with portlandite producing calcium carbonate (CaCO3). In severe carbonation conditions, C-S-H gel is decomposed into silica gel (SiO2.nH2O) and CaCO3. As a result, concrete pore water pH decreases (usually below 10) and eventually steel reinforcing bars become unprotected from corrosion agents. Usually, the carbonation of the cementing matrix reduces the porosity, because CaCO3 crystals (calcite and vaterite) occupy more volume than portlandite. In this study, an accelerated carbonation-ageing proceß is conducted on Portland cement mortar samples with water to cement ratio of 0.5. The evolution of the carbonation proceß on mortar is monitored at different levels of ageing until the mortar is almost fully carbonated. A nondestructive technique based on nonlinear acoustic resonance is used to monitor the variation of the constitutive properties upon carbonation. At selected levels of ageing, the compreßive strength is obtained. From fractured surfaces the depth of carbonation is determined with phenolphthalein solution. An image analysis of the fractured surfaces is used to quantify the depth of carbonation. The results from resonant acoustic tests revealed a progreßive increase of stiffneß and a decrease of material nonlinearity.
AB - Carbonation is an important deleterious proceß for concrete structures. Carbonation begins when carbon dioxide (CO2) present in the atmosphere reacts with portlandite producing calcium carbonate (CaCO3). In severe carbonation conditions, C-S-H gel is decomposed into silica gel (SiO2.nH2O) and CaCO3. As a result, concrete pore water pH decreases (usually below 10) and eventually steel reinforcing bars become unprotected from corrosion agents. Usually, the carbonation of the cementing matrix reduces the porosity, because CaCO3 crystals (calcite and vaterite) occupy more volume than portlandite. In this study, an accelerated carbonation-ageing proceß is conducted on Portland cement mortar samples with water to cement ratio of 0.5. The evolution of the carbonation proceß on mortar is monitored at different levels of ageing until the mortar is almost fully carbonated. A nondestructive technique based on nonlinear acoustic resonance is used to monitor the variation of the constitutive properties upon carbonation. At selected levels of ageing, the compreßive strength is obtained. From fractured surfaces the depth of carbonation is determined with phenolphthalein solution. An image analysis of the fractured surfaces is used to quantify the depth of carbonation. The results from resonant acoustic tests revealed a progreßive increase of stiffneß and a decrease of material nonlinearity.
KW - Carbonation
KW - Cement based materials
KW - Nondestructive test
KW - Nonlinear acoustic
UR - http://www.scopus.com/inward/record.url?scp=84940114852&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84940114852&partnerID=8YFLogxK
U2 - 10.1117/12.2084124
DO - 10.1117/12.2084124
M3 - Conference contribution
AN - SCOPUS:84940114852
SN - 9781628415414
VL - 9438
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - SPIE
ER -