Keyword
Carbonation prediction,concrete,cement,HAMADA Equation,Water/Cement weight
ratio.
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Reference
[1]:浜田稔:『コンクリートの中性化と鉄筋の腐食』.
[2]:岸谷孝一:『鉄筋コンクリートの耐久性』,鹿島建設技術研究所出版部,1963.
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Remarks
・t(year)=0.3*(1.15+3*w)*x(cm)^2/(w-0.25)^2/R^2.※Modified formula by KISHITANI."0.25"
in this formula is described "0.5" in HAMADA's thesis.
・R=γc*γa*γs.
・Input "Water/Cement weight ratio" should be larger than 0.40.
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Cement
|
γc |
Ordinary Portland Cement |
1.0 |
High early strength portland cement |
0.6 |
Furnace Slag(30~40%) Cement |
1.4 |
Furnace Slag(Around 60%) Cement |
2.2 |
Silica cement |
1.7 |
Fly Ash Cement |
1.9 |
|
Aggregate
|
γa |
River sand・River gravel |
1.0 |
River sand・Light-weight gravel |
1.2 |
Light-weight sand・Light-weight gravel |
2.9 |
Coal cinders |
3.3 |
- |
- |
- |
- |
|
Surface active agent
|
γs |
Plain |
1.0 |
AE agent |
0.6 |
Dispersing agent |
0.4 |
- |
- |
- |
- |
- |
- |
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History
・2010/02/16:Renewal.
・2009/03/15:Moved from www.am-consulting.co.jp to here.
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