Effect of Slag Cement on Drying Shrinkage of Concrete

Abstract

The effect of a partial replacement of cement with slag cement on free shrinkage is evaluated for curing periods between 3 and 28 days. Mixtures include concrete containing different replacement levels of slag cement (30, 60, and 80% by volume)

Effects of Internal Curing, Slag, and Silica Fume on Concrete Shrinkage

“…They found that a partial replacement of cement with slag cement reduced shrinkage-a reduction that was greatest at early ages and increased as the replacement level of slag was increased. Yuan et al (2015) also found, as did Darwin et al (2007) and Lindquist et al (2008), that when slag cement was used in conjunction with a saturated porous limestone coarse aggregate, which provided internal curing, a greater reduction in shrinkage was observed than obtained in mixtures containing a low-absorption coarse aggregate.…”

“…The results indicate that: 1) internal curing using prewetted lightweight aggregate reduces the tendency of the mixtures to develop shrinkage strains at early ages; and 2) the reduction is significantly enhanced when internal curing is combined with slag cement or slag cement and silica fume. As observed by Darwin et al (2007), Lindquist et al (2008), and Yuan et al (2015), when a partial replacement of cement with slag cement is combined with internal curing provided by porous limestone coarse aggregate, there appears to be a synergistic effect when combining slag and silica fume with internal curing.…”

“…An additional small reduction (approximately 20 microstrain) in shrinkage was observed when a small amount (9.8% by volume of binder) of silica fume was used in conjunction with slag cement. Yuan et al (2015) compared the shrinkage of concrete mixtures containing different volume replacements of cement with slag cement with that of concrete mixtures made with 100% portland cement. The w/cm (0.44) and paste volume (24.1%) of the cementitious material were constant for all mixtures.…”

Effect of Lithium Slag on Drying Shrinkage of Concrete with Manufactured-sand

“…on the other hand, the capillary tension of concrete because of the water evaporation is increased with the pore size refinement of concrete, which leads to the increase of drying shrinkage. The development and change of drying shrinkage of concrete depend mainly on the proportions of the positive and negative effect of the pore size refinement [13][14][15][16]. Combined the results shown in Figure 3 with the results shown in Figure 4, the positive effect of pore size refinement on the drying shrinkage is greater than the negative effect.…”

Compatibility of Shrinkage-Reducing and Air-Entraining Admixtures

“…The study presented in this paper is part of a long-term research program at the University of Kansas to develop low-cracking high-performance concrete (LC-HPC) for bridge deck applications (Darwin et al 2004(Darwin et al , 2012Lindquist et al 2006Lindquist et al , 2008McLeod et al 2009McLeod et al , 2010Pendergrass and Darwin 2014;Yuan et al 2011Yuan et al , 2015.…”