Aluminum in Contact with Fresh Concrete

Aluminum in Contact with Fresh Concrete

New York State Department Of Transportation Region 9 Construction Group

The Specification

? 2016 Standard Specifications, Page 430, line 6

..."Concrete shall not come in contact with any aluminum during conveying and placing operations."

New York State Department Of Transportation Region 9 Construction Group

The Situation

? The holes in plywood

New York State Department Of Transportation Region 9 Construction Group

The contractor's solution

? The aluminum flashing ~ 2"x3"

New York State Department Of Transportation Region 9 Construction Group

What is Portland Cement

Cement Compound

%wgt Chemical Formula

? Tricalcium silicate ? Dicalcium silicate ? Tricalcium aluminate ? Tetracalcium aluminoferrite

50 % 25 % 10 % 10 %

? Gypsum

5 %

Ca3SiO5 or 3CaO.SiO2 Ca2SiO4 or 2CaO.SiO2 Ca3Al2O6 or 3CaO.Al2O3 Ca4Al2Fe10 or 4CaO.Al2O3.Fe2O3 CaSO4.2H2O

Note that free Calcium Hydroxide Ca(OH)2 is absent

Source : Dept. of Materials Science & Engineering, University of Illinois Urbana-Champaign

New York State Department Of Transportation Region 9 Construction Group

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