Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imaging
ABSTRACT The carbonation process is one of the factors that cause a reduction in the hydrogenionic potential (pH) in cementitious composites, which can lead to a depassivation of the reinforcement structures, thus furnishing conditions for a corrosion process to begin. In this paper, the research so...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Instituto Brasileiro do Concreto (IBRACON)
|
| Series: | Revista IBRACON de Estruturas e Materiais |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000300653&lng=en&tlng=en |
| _version_ | 1819149516164562944 |
|---|---|
| author | E. LACERDA A.G. MAGALHÃES E.E. BERNARDES E. H. M. NUNES W.L. VASCONCELOS |
| author_facet | E. LACERDA A.G. MAGALHÃES E.E. BERNARDES E. H. M. NUNES W.L. VASCONCELOS |
| author_sort | E. LACERDA |
| collection | DOAJ |
| description | ABSTRACT The carbonation process is one of the factors that cause a reduction in the hydrogenionic potential (pH) in cementitious composites, which can lead to a depassivation of the reinforcement structures, thus furnishing conditions for a corrosion process to begin. In this paper, the research sought to monitor the progress of the carbonation front according to European standard EN 14630, concurrently with the measurement of pH variation on the cementitious composite surface. Cylindrical mortar specimens with size of (2 x 4) cm were placed in a carbonation chamber with controlled conditions, keeping up the humidity at 65%, temperature at 28 °C and the CO2 concentration of 5%. The void structure of the matrix was evaluated by X-ray microtomography technique (μ-CT). The pH reading enabled the monitoring of the carbonation front progress in function of loss of alkalinity, even before the procedure laid down in standard EN 14630. The images obtained through µ-CT did not enable the visualization of the densification of the material found in the outermost layer of the specimen. |
| first_indexed | 2024-12-22T14:02:51Z |
| format | Article |
| id | doaj.art-dc310c600e5c4744916e68131e7d2726 |
| institution | Directory Open Access Journal |
| issn | 1983-4195 |
| language | English |
| last_indexed | 2024-12-22T14:02:51Z |
| publisher | Instituto Brasileiro do Concreto (IBRACON) |
| record_format | Article |
| series | Revista IBRACON de Estruturas e Materiais |
| spelling | doaj.art-dc310c600e5c4744916e68131e7d27262022-12-21T18:23:23ZengInstituto Brasileiro do Concreto (IBRACON)Revista IBRACON de Estruturas e Materiais1983-419510365366810.1590/s1983-41952017000300006S1983-41952017000300653Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imagingE. LACERDAA.G. MAGALHÃESE.E. BERNARDESE. H. M. NUNESW.L. VASCONCELOSABSTRACT The carbonation process is one of the factors that cause a reduction in the hydrogenionic potential (pH) in cementitious composites, which can lead to a depassivation of the reinforcement structures, thus furnishing conditions for a corrosion process to begin. In this paper, the research sought to monitor the progress of the carbonation front according to European standard EN 14630, concurrently with the measurement of pH variation on the cementitious composite surface. Cylindrical mortar specimens with size of (2 x 4) cm were placed in a carbonation chamber with controlled conditions, keeping up the humidity at 65%, temperature at 28 °C and the CO2 concentration of 5%. The void structure of the matrix was evaluated by X-ray microtomography technique (μ-CT). The pH reading enabled the monitoring of the carbonation front progress in function of loss of alkalinity, even before the procedure laid down in standard EN 14630. The images obtained through µ-CT did not enable the visualization of the densification of the material found in the outermost layer of the specimen.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000300653&lng=en&tlng=enmortarcarbonationpHXray microtomography. |
| spellingShingle | E. LACERDA A.G. MAGALHÃES E.E. BERNARDES E. H. M. NUNES W.L. VASCONCELOS Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imaging Revista IBRACON de Estruturas e Materiais mortar carbonation pH Xray microtomography. |
| title | Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imaging |
| title_full | Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imaging |
| title_fullStr | Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imaging |
| title_full_unstemmed | Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imaging |
| title_short | Monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ-CT imaging |
| title_sort | monitoring the carbonation front progress in a cementitious composite having its pore structure analyzed through μ ct imaging |
| topic | mortar carbonation pH Xray microtomography. |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000300653&lng=en&tlng=en |
| work_keys_str_mv | AT elacerda monitoringthecarbonationfrontprogressinacementitiouscompositehavingitsporestructureanalyzedthroughmctimaging AT agmagalhaes monitoringthecarbonationfrontprogressinacementitiouscompositehavingitsporestructureanalyzedthroughmctimaging AT eebernardes monitoringthecarbonationfrontprogressinacementitiouscompositehavingitsporestructureanalyzedthroughmctimaging AT ehmnunes monitoringthecarbonationfrontprogressinacementitiouscompositehavingitsporestructureanalyzedthroughmctimaging AT wlvasconcelos monitoringthecarbonationfrontprogressinacementitiouscompositehavingitsporestructureanalyzedthroughmctimaging |