Abstract
Carbonation is one of the key factors that affect the durability of reinforced concrete structures. This research investigated the carbonation of existing concrete building structures located in a coastal city (Shenzhen, China) under subtropical maritime monsoon climate. The relationship between carbonation depth and external influencing factors (e.g. temperature, humidity, concentration of CO2, and surface coating) as well as internal factor (reflecting concrete characteristics e.g. compressive strength) were analyzed. In addition, a prediction model was modified from the existing empirical models with an attempt to evaluate the carbonation risk in existing concrete structures. Test results showed that the carbonation level of indoor ends was higher than that of outdoor ends due to the higher average concentration of CO2 at indoor ends as well as presence of surface coating at the outdoor ends. The natural carbonation depth was found to have a negative correlation with the compressive strength of concrete and thickness of mortar cover. When the thickness of mortar coating was over 8 mm, no carbonation was observed in existing concrete structures having an age of up to 25 years. Finally, the predicted results from the modified model, which took into account the influence of both internal and external factors, agreed well with tested data. Hence, the modified model can be used to predict the carbonation in existing concrete structures with/without surface coatings to benefit the durability design of existing building structures.
| Original language | English |
|---|---|
| Pages (from-to) | 73-81 |
| Number of pages | 9 |
| Journal | Construction and Building Materials |
| Volume | 167 |
| DOIs | |
| Publication status | Published - Apr 10 2018 |
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Keywords
- Carbonation
- Compressive strength
- Concrete building structures
- Prediction model
- Surface coating
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Materials Science(all)
Cite this
Evaluating the effect of external and internal factors on carbonation of existing concrete building structures. / Li, Dawang; Chen, Bin; Sun, Hongfang; Memon, Shazim Ali; Deng, Xiangbin; Wang, Yaocheng; Xing, Feng.
In: Construction and Building Materials, Vol. 167, 10.04.2018, p. 73-81.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evaluating the effect of external and internal factors on carbonation of existing concrete building structures
AU - Li, Dawang
AU - Chen, Bin
AU - Sun, Hongfang
AU - Memon, Shazim Ali
AU - Deng, Xiangbin
AU - Wang, Yaocheng
AU - Xing, Feng
PY - 2018/4/10
Y1 - 2018/4/10
N2 - Carbonation is one of the key factors that affect the durability of reinforced concrete structures. This research investigated the carbonation of existing concrete building structures located in a coastal city (Shenzhen, China) under subtropical maritime monsoon climate. The relationship between carbonation depth and external influencing factors (e.g. temperature, humidity, concentration of CO2, and surface coating) as well as internal factor (reflecting concrete characteristics e.g. compressive strength) were analyzed. In addition, a prediction model was modified from the existing empirical models with an attempt to evaluate the carbonation risk in existing concrete structures. Test results showed that the carbonation level of indoor ends was higher than that of outdoor ends due to the higher average concentration of CO2 at indoor ends as well as presence of surface coating at the outdoor ends. The natural carbonation depth was found to have a negative correlation with the compressive strength of concrete and thickness of mortar cover. When the thickness of mortar coating was over 8 mm, no carbonation was observed in existing concrete structures having an age of up to 25 years. Finally, the predicted results from the modified model, which took into account the influence of both internal and external factors, agreed well with tested data. Hence, the modified model can be used to predict the carbonation in existing concrete structures with/without surface coatings to benefit the durability design of existing building structures.
AB - Carbonation is one of the key factors that affect the durability of reinforced concrete structures. This research investigated the carbonation of existing concrete building structures located in a coastal city (Shenzhen, China) under subtropical maritime monsoon climate. The relationship between carbonation depth and external influencing factors (e.g. temperature, humidity, concentration of CO2, and surface coating) as well as internal factor (reflecting concrete characteristics e.g. compressive strength) were analyzed. In addition, a prediction model was modified from the existing empirical models with an attempt to evaluate the carbonation risk in existing concrete structures. Test results showed that the carbonation level of indoor ends was higher than that of outdoor ends due to the higher average concentration of CO2 at indoor ends as well as presence of surface coating at the outdoor ends. The natural carbonation depth was found to have a negative correlation with the compressive strength of concrete and thickness of mortar cover. When the thickness of mortar coating was over 8 mm, no carbonation was observed in existing concrete structures having an age of up to 25 years. Finally, the predicted results from the modified model, which took into account the influence of both internal and external factors, agreed well with tested data. Hence, the modified model can be used to predict the carbonation in existing concrete structures with/without surface coatings to benefit the durability design of existing building structures.
KW - Carbonation
KW - Compressive strength
KW - Concrete building structures
KW - Prediction model
KW - Surface coating
UR - http://www.scopus.com/inward/record.url?scp=85041546430&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041546430&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2018.01.127
DO - 10.1016/j.conbuildmat.2018.01.127
M3 - Article
VL - 167
SP - 73
EP - 81
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -