DURABILITY OF CONCRETE MADE FROM RECYCLED AGGREGATES

DURABILITY OF CONCRETE MADE FROM RECYCLED AGGREGATES

Paper in proceedings (conference paper)

This study describes findings of monitoring concerning the sulphate/acid resistance of concrete made from various volumes of fine/coarse recycled concrete aggregates. Corroding medium used: Na2SO4 concentrated solution to 10,000 mg/l, or diluted HCl with pH 3 in some cases. Test samples have been exposed to this medium for a period of 18 months. Natural aggregates have been replaced with recycled concrete ones in various proportions; monitoring findings show that there are concretes resistant to sulphate/acid aggressive environment as follows: (i) reference concrete (etalon); (ii) concrete made from fine (100 % natural) aggregate and coarse aggregate (50 % natural, 50 % recycled aggregate); (iii) concrete made from fine (100 % natural) aggregate and coarse aggregate (100 % recycled aggregate); (iv) concrete made from fine (50 % natural, 50 % recycled aggregate) aggregate and coarse aggregate (100 % natural). Parameters of other concretes under monitoring hit their maximum levels after 6 to 12 months of exposure being followed by a subsequent decrease; that is why they are not resistant to said aggressive environment

This study describes findings of monitoring concerning the sulphate/acid resistance of concrete made from various volumes of fine/coarse recycled concrete aggregates. Corroding medium used: Na2SO4 concentrated solution to 10,000 mg/l, or diluted HCl with pH 3 in some cases. Test samples have been exposed to this medium for a period of 18 months. Natural aggregates have been replaced with recycled concrete ones in various proportions; monitoring findings show that there are concretes resistant to sulphate/acid aggressive environment as follows: (i) reference concrete (etalon); (ii) concrete made from fine (100 % natural) aggregate and coarse aggregate (50 % natural, 50 % recycled aggregate); (iii) concrete made from fine (100 % natural) aggregate and coarse aggregate (100 % recycled aggregate); (iv) concrete made from fine (50 % natural, 50 % recycled aggregate) aggregate and coarse aggregate (100 % natural). Parameters of other concretes under monitoring hit their maximum levels after 6 to 12 months of exposure being followed by a subsequent decrease; that is why they are not resistant to said aggressive environment

Durability, Concrete , Recycled Concrete Aggregate

Durability, Concrete , Recycled Concrete Aggregate

BROŽOVSKÝ, J.; ZACH, J.; BROŽOVSKÝ, J.

01.03.2006

Technion - Israel Institut of Technology, Haifa, Israel, RILEM Publicacions S.A.-R.L.,

Ein-Bokek

2-912143-89-6

International RILEM - JCI Seminar on Concrete Durability and Service Life Planning ConceteLife06,

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