Calculation of Carbonation Prediction of Concrete by KISHITANI formula.

Keyword

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

Reference

[1]: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

・Case:0.6<=w. t(year)=0.3*(1.15+3*w)*x(cm)^2/(w-0.25)^2/R^2.
・Case:w<0.6. t(year)=7.2*x(cm)^2/(4.6*w-1.76)^2/R^2.
・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

・2010/02/20:Renewal.
・2009/03/15:Upload.