Substitution of aluminous cement by calcium carbonates in presence of carboxylic acid. (15th November 2017)

• Record Type: Journal Article
• Authors: El Hafiane, Y.; Smith, A.; Abouliatim, Y.; Benhammou, A.; Abourriche, A.; Nibou, L.; Tanouti, B.; Bonnet, J.P.
• Is Part Of: Construction & building materials. Volume 154(2017)
• Page Start: 711
• Page End: 720
• Publication Date: 2017-11-15
• Subjects: Calcium aluminate cement -- Calcium carbonates -- Dispersant -- Microstructure -- Mechanical strength; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.08.023
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: HOAc has a remarkable dispersive effect over paste mixture M1. The well-dispersed pastes lead to densification of the hardened material. The mechanical properties of the densified materials are improved. Materials based of mixtures: Secar 71 + CaCO3 + HOAc favor the formation of C4 A C ‾ _H11 . Abstract: This paper presents results concerning the partial substitution of a calcium aluminate cement by calcium carbonate. The experimental parameters monitored in this study are the mechanical properties, the microstructure evolution through density measurements and the structure through analysis by X-ray diffraction. The major results of this study are the following: (1) It is possible to substitute a portion (10 wt%) of an aluminous cement by calcium carbonate, while improving the mechanical properties of the hardened material. This is achieved with a mass percentage of the carboxylic acid between 1 and 5%, relative to the dry mass, which acts as a good dispersant and leads therefore to densification of the hardened material. (2) When the mix consists of 50 wt% of aluminous cement and 50 wt% of calcium carbonate, the mechanical properties of the cured material are low and this happens whatever the percentage of added dispersant is.