Study of mechanical properties and durability of magnesium phosphate cement matrix containing grinding dust

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 16; no. 5; pp. 1113 - 1121
• Main Authors: Ribeiro, D V, Agnelli, J A M, Morelli, M R
• Format: Journal Article
• Language: English; Portuguese
• Published: ABM, ABC, ABPol 01-09-2013; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: accelerated aging; Aging; cement; Cements; Ceramics; Compressive strength; durability; Dust; ENGINEERING, CHEMICAL; Magnesium phosphate; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; MgO; Molding (process); Mortars; waste; accelerated aging; waste; cement; MgO; durability
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/S1516-14392013005000105

Acid-base cements belong to the family of the so called "chemically bonded phosphate ceramics" (CBPCs), new types of inorganic materials that have particular physico-chemical properties and that, in contrast to most advanced ceramics, are made by processing the material at ambient temperature. Cylindrical specimens (30 x 50 mm) were moulded with magnesium phosphate cement and grinding dust (automobile industry waste) which was added to ceramic matrices in various amounts (0-40 wt%). The effect of this addition with regard to phase formation and mechanical resistance of the compositions (3, 7 and 28 days after moulding) was evaluated. The samples of magnesium phosphate cement mortars containing grinding dust were then analysed after being subjected to accelerated ageing for 1200 h (50 days), equivalent to one year of natural ageing. The results showed a decrease in the compressive strength of the mortar between 28 days and 1 year of ageing, but this loss in performance was not associated with the presence of grinding dust and the CBPCs proved highly satisfactory for the encapsulation of hazardous wastes.