Microstructure and durability of mortars modified with medium active blast furnace slag

作者：Hadj sadok Ahmed; Kenai Said^*; Courard Luc; Darimont Anne

来源：Construction and Building Materials, 2011, 25(2): 1018-1025.

DOI：10.1016/j.conbuildmat.2010.06.077

• Environment
• Mortar
• Blast furnace slag
• Hydraulic activity
• Pore structure
• Microstructure
• Durability
• Chloride diffusion

Mechanical characteristics and durability properties of blast furnace slag cement composites largely depend on the hydraulic activity of the slag. In this paper, a Granulated Blast Furnace Slag with a low reactivity index is used in modifying mortar composition. Microstructure and durability of mixes containing 0%, 30% and 50% of slag as substitution to OPC are respectively compared and analyzed. Water porosity, Mercury Intrusion Porosity and pore size distribution are studied after 28, 90 and 360 days of wet curing. A qualitative microstructure analysis of mortars is proposed with Scanning Electron Microscope (SEM). The durability of mortar is evaluated through capillary water absorption and chloride diffusion tests. The results indicate a finer porosity and lower water absorption for slag mortars at old ages (90 and 360 days). Moreover, lower chloride diffusion for 50% blast furnace slag substitution is observed.

• 出版日期2011-2