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Abstract
AbstractThis research examines the efficiency of thermomechanical pulp (TMP) fibers, both untreated and after chemical treatment to produce holocellulose and α-cellulose, for internal curing. In addition, the effect of TMP fibers on early hydration behavior was investigated. The results show that TMP and α-cellulose fibers had a negligible effect on cement hydration. Holocellulose, conversely, significantly reduced the rate of hydration, noticeably delaying setting time. The addition of the fibers in dosages to provide an additional amount of entrained water of 0.05 g per gram of cement resulted in a decrease of early autogenous shrinkage of cement paste. Holocellulose, reducing autogenous shrinkage of cement paste by 93%, was shown to be the most effective for internal curing; however, its adverse effect on cement hydration may require acceleratory admixtures when used in concrete. Thermomechanical pulp and α-cellulose showed a similar efficiency in mitigating autogenous shrinkage; these fibers reduced s...
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