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Effect of heat curing treatment on the drying shrinkage behavior and microstructure characteristics of mortar incorporating different content ground granulated blast-furnace slag.
- Source :
-
Construction & Building Materials . Oct2018, Vol. 186, p379-387. 9p. - Publication Year :
- 2018
-
Abstract
- Highlights • Heat-treated mortar exhibits lower mass loss than that of untreated mortar. • The drying shrinkage of untreated and heat-treated mortar decreases with the increase of the replacement amount of GGBS. • There is an optimal content of about 40% GGBS to restrain drying shrinkage. • The main effect of heat curing treatment on mortar incorporating lower content GGBS is the structure of C-S-H gel. • The hydration degree and pore structure have a more significant influence for mortar incorporating higher content GGBS. Abstract The effect of heat curing treatment that samples cured from room temperature to an elevated temperature of 60 °C for 24 h on the mass loss, drying shrinkage and microstructure of mortar incorporating ground granulated blast-furnace slag (GGBS) as cement replacement at 0%, 20%, 40% and 60% by weight was experimentally investigated in this study. The results show that the heat-treated mortar exhibits lower mass loss compared to the untreated mortar. In addition, when the content of GGBS is 0% or 20%, the heat-treated mortar has a lower drying shrinkage than that of untreated mortar. However, when the content of GGBS is 40% or 60%, the result is the opposite. Moreover, for the heat-treated and untreated mortar, there is an optimal replacement content of about 40% GGBS to restrain drying shrinkage. For the mortar incorporating 0% or 20% GGBS, infrared spectrum (IR) and nuclear magnetic resonance (NMR) analysis reveal that the heat curing treatment mainly leads to a higher degree of silicon polymerization in C-S-H gel and consequently affects the drying shrinkage. For the mortar incorporating 40% or 60% GGBS, scanning electron microscopy (SEM), chemical bound water and mercury intrusion porosimetry (MIP) analysis show that heat curing treatment mainly increases the amount of C-S-H gel and mesopore (<50 nm) of mortar and consequently affects the drying shrinkage. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09500618
- Volume :
- 186
- Database :
- Academic Search Index
- Journal :
- Construction & Building Materials
- Publication Type :
- Academic Journal
- Accession number :
- 131606961
- Full Text :
- https://doi.org/10.1016/j.conbuildmat.2018.07.079