TY - JOUR
T1 - Physical salt attack on concrete incorporating nano-silica
AU - Zeidan, Mohamed
AU - Bassuoni, Mohamed T.
AU - Said, Aly
N1 - Publisher Copyright:
© 2016 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2017/5/4
Y1 - 2017/5/4
N2 - The damage induced by crystallization of salts (physical salt attack, PSA) has been often misidentified as chemical attack. Under certain environmental conditions, PSA may cause notable surface damage of concrete partially embedded in salt-rich soils. The process is similar to salt weathering of natural rocks. The current study investigated the effect of refining the microstructure of concrete by nano-silica additions on its resistance to PSA in an accelerated procedure. Specimens were partially immersed in a high-concentration sodium sulphate solution and simultaneously exposed to cyclic temperature and relative humidity. Specimens’ deterioration was monitored for more than 100 cycles of exposure. Also, an effort was made to analyse the relationships between specimen damage, characteristics of pore structure and absorption capacity. Finally, the immersed and drying portions of specimens were tested by X-ray diffraction and Rietveld analysis and scanning electron microscopy to identify the root cause of damage.
AB - The damage induced by crystallization of salts (physical salt attack, PSA) has been often misidentified as chemical attack. Under certain environmental conditions, PSA may cause notable surface damage of concrete partially embedded in salt-rich soils. The process is similar to salt weathering of natural rocks. The current study investigated the effect of refining the microstructure of concrete by nano-silica additions on its resistance to PSA in an accelerated procedure. Specimens were partially immersed in a high-concentration sodium sulphate solution and simultaneously exposed to cyclic temperature and relative humidity. Specimens’ deterioration was monitored for more than 100 cycles of exposure. Also, an effort was made to analyse the relationships between specimen damage, characteristics of pore structure and absorption capacity. Finally, the immersed and drying portions of specimens were tested by X-ray diffraction and Rietveld analysis and scanning electron microscopy to identify the root cause of damage.
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U2 - 10.1080/21650373.2016.1218802
DO - 10.1080/21650373.2016.1218802
M3 - Article
AN - SCOPUS:84984677416
VL - 6
SP - 195
EP - 216
JO - Journal of Sustainable Cement-Based Materials
JF - Journal of Sustainable Cement-Based Materials
SN - 2165-0373
IS - 3
ER -