Effect of phosphogypsum adding on setting kinetics and mechanical resistance of geopolymer based on metakaolin or fly ash matrices

Author:

HATTAF Rabii1,Aboulayt Abdelilah2,Lahlou Nouha1,Touhami Mohamed Ouazzani1,Gomina Moussa3,Samdi Azzeddine1,Moussa Redouane1

Affiliation:

1. University of Hassan II Casablanca Faculty of Science Ain Chock: Universite Hassan II de Casablanca Faculte des Sciences Ain Chock

2. National School of Architecture: Ecole Nationale d'Architecture

3. CRISMAT: Laboratoire de cristallographie et sciences des materiaux

Abstract

Abstract Phosphogypsum results from the attack of phosphate ores with sulphuric acid with the aim of producing phosphoric acid. Large quantities of this industrial waste are produced annually, even though it is very harmful because the ores often have a high content of heavy metals. It is therefore necessary to undertake studies in order to reduce its production or to valorise it in the fields of building and civil engineering, in particular. Recent works propose a new way of valorisation in the technology of geopolymers: the addition of phosphogypsum in the mixtures improves the fire resistance of the products, which constitutes a great potential of use in many applications. Our study aims to highlight the effects of the addition of phosphogypsum on certain characteristics of geopolymer matrices based on metakaolin and fly ash, in the fresh state and in the hardened state. Monitoring the workability of the geopolymer matrices indicates that the addition of phosphogypsum increases the viscosity, but impairs the flowability and the shaping. Thus, the phosphogypsum addition rate is limited to 15% for metakaolin-based matrices and 12% for those based on fly ash, with a setting retarding effect in both cases. Moreover, the introduction of phosphogypsum to these matrices up to a mass rate of 6% has no significant effect on the mechanical resistance. Beyond that rate, the mechanical resistance deteriorates significantly.

Publisher

Research Square Platform LLC

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