Compressive strength and corrosion evaluation of concretes containing pozzolana and perlite immersed in aggressive environments

•Pozzolan improves the mechanical properties of concrete at 20% of replacement rate of cement.•Perlite improves the mechanical properties of concrete at 10% of replacement rate of cement.•10% PZ and 10%P led to an increase in reduction of the corrosion rate in 5% of NaCl.•20% and 30% of PZ and P res...

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Bibliographic Details
Published in:Construction & building materials 2018-08, Vol.179, p.25-34
Main Authors: Fodil, Dif, Mohamed, Mouli
Format: Article
Language:English
Subjects:
Analysis
Building materials durability
Chloride
Compressive strength
Concrete
Corrosion
Mechanical properties
Perlite
Portland cement
Pozzolan
Resistance
Sulfate
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Summary:•Pozzolan improves the mechanical properties of concrete at 20% of replacement rate of cement.•Perlite improves the mechanical properties of concrete at 10% of replacement rate of cement.•10% PZ and 10%P led to an increase in reduction of the corrosion rate in 5% of NaCl.•20% and 30% of PZ and P respectively has a negative effect on corrosion in the aggressive medium. This study contributes to the development of more sustainable systems to limit and adverse the environmental effects as well as the disintegration of artificial Portland cement (APC) concrete structures. In this context, experimental tests were carried out to develop sustainable binders using natural pozzolan (PZ) and perlite (P) with a relatively high cement substitution rate. A certain level of cement replacement with these pozzolans is very advantageous in terms of cost, energy efficiency, environmental benefits, as well as mechanical properties and durability. A number of important properties of concrete such as compressive strength, corrosion resistance, chloride penetration, sulphate resistance have been developed and noted here. The results obtained show that 10% and 20% of natural pozzolan improves the mechanical properties, and it is noted that 10% of the replacement of the cement by pozzolan and 10% of the perlite led to a reduction of the speed of NaCl corrosion. A larger replacement of pozzolan and perlite had a negative effect on corrosion. Finally, it should be noted that sulfate ions did not affect the corrosion.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2018.05.190