Calculation of Carbonation Prediction of Concrete by HAMADA formula.

Keyword

Carbonation prediction,concrete,cement,HAMADA Equation,Water/Cement weight ratio.

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.

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.

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
- -
- -
- -

History

・2010/02/16:Renewal.
・2009/03/15:Moved from www.am-consulting.co.jp to here.