Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years
The effect of recycled concrete aggregate (RCA) on concrete performance against external sulfate attack (ESA) is not yet fully known. In this paper, recycled aggregate concretes (RAC) with 0, 50, 75 and 100% of RCA contents were evaluated after 10 years of exposure immersed in 50g/l sodium sulfate s...
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Consejo Superior de Investigaciones Científicas
2020-03-01
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doaj-c6d9ee6d0779475d91d2529ed9ea515b2021-05-05T07:36:25ZengConsejo Superior de Investigaciones CientíficasMateriales de Construccion0465-27461988-32262020-03-0170337e212e21210.3989/mc.2020.063192204Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 yearsL. R. Santillán0https://orcid.org/0000-0002-9040-4417F. Locati1https://orcid.org/0000-0001-9067-1497Y. A. Villagrán-Zaccardi2https://orcid.org/0000-0002-0259-7213C. J. Zega3https://orcid.org/0000-0002-9199-9176LEMIT, CONICETCICTERRA, UNC-CONICETLEMIT, CONICETLEMIT, CONICETThe effect of recycled concrete aggregate (RCA) on concrete performance against external sulfate attack (ESA) is not yet fully known. In this paper, recycled aggregate concretes (RAC) with 0, 50, 75 and 100% of RCA contents were evaluated after 10 years of exposure immersed in 50g/l sodium sulfate solution. Sulfate ingress profiles were obtained by wet chemical analyses and FRX. Also, the mineralogy of the ingress profile was evaluated by thermogravimetric analyses. Finally, microcracking development in samples was evaluated by optical fluorescent microscopy image analysis. Although RAC showed a slight increase in sulfate ingress, due to its higher porosity (about 30% higher SO3 content near the surface for 50% or higher replacement ratio than control concrete), a dense new matrix still allows a good performance of RAC to external sulfate attack with even 100% RCA content.http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2279concretetransport propertiessulphate attackmicrocrackingthermal analysis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
L. R. Santillán F. Locati Y. A. Villagrán-Zaccardi C. J. Zega |
spellingShingle |
L. R. Santillán F. Locati Y. A. Villagrán-Zaccardi C. J. Zega Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years Materiales de Construccion concrete transport properties sulphate attack microcracking thermal analysis |
author_facet |
L. R. Santillán F. Locati Y. A. Villagrán-Zaccardi C. J. Zega |
author_sort |
L. R. Santillán |
title |
Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years |
title_short |
Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years |
title_full |
Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years |
title_fullStr |
Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years |
title_full_unstemmed |
Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years |
title_sort |
long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years |
publisher |
Consejo Superior de Investigaciones Científicas |
series |
Materiales de Construccion |
issn |
0465-2746 1988-3226 |
publishDate |
2020-03-01 |
description |
The effect of recycled concrete aggregate (RCA) on concrete performance against external sulfate attack (ESA) is not yet fully known. In this paper, recycled aggregate concretes (RAC) with 0, 50, 75 and 100% of RCA contents were evaluated after 10 years of exposure immersed in 50g/l sodium sulfate solution. Sulfate ingress profiles were obtained by wet chemical analyses and FRX. Also, the mineralogy of the ingress profile was evaluated by thermogravimetric analyses. Finally, microcracking development in samples was evaluated by optical fluorescent microscopy image analysis. Although RAC showed a slight increase in sulfate ingress, due to its higher porosity (about 30% higher SO3 content near the surface for 50% or higher replacement ratio than control concrete), a dense new matrix still allows a good performance of RAC to external sulfate attack with even 100% RCA content. |
topic |
concrete transport properties sulphate attack microcracking thermal analysis |
url |
http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2279 |
work_keys_str_mv |
AT lrsantillan longtermsulfateattackonrecycledaggregateconcreteimmersedinsodiumsulfatesolutionfor10years AT flocati longtermsulfateattackonrecycledaggregateconcreteimmersedinsodiumsulfatesolutionfor10years AT yavillagranzaccardi longtermsulfateattackonrecycledaggregateconcreteimmersedinsodiumsulfatesolutionfor10years AT cjzega longtermsulfateattackonrecycledaggregateconcreteimmersedinsodiumsulfatesolutionfor10years |
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