4.6 Article

Volume Stability of Cement Paste Containing Limestone Fines

Journal

BUILDINGS
Volume 11, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/buildings11080366

Keywords

limestone fines; chemical shrinkage; autogenous shrinkage; drying shrinkage; expansion

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In this study, it was found that replacing 15% of limestone fines can enhance the chemical shrinkage of the paste, while autogenous shrinkage increases between 0 and 10% replacement and sharply decreases at 15% and 20% replacement. Drying shrinkage increases with the increase in limestone fines content, and expansion increases for replacements above 15% limestone fines.
The common cause of cracking in cement paste is shrinkage due to different reasons, such as loss of water and chemical reactions. Incorporating limestone fines (LF) as a cement replacement can affect the shrinkage of the paste. To examine this effect, five paste mixes were prepared with 0, 5, 10, 15 and 20% LF as a cement replacement and with a water-to-binder ratio (w/b) of 0.45. Four volume stability tests were conducted for each paste: chemical, autogenous and drying shrinkage and expansion. Chemical shrinkage was tested each hour for the first 24 h and thereafter every 2 days for a total period of 90 days. The drying shrinkage, autogenous shrinkage and expansion were monitored every 2 days until 90 days. The results showed that replacing 15% LF enhanced the chemical shrinkage of the paste. However, autogenous shrinkage of the paste was found to increase between 0 and 10% LF and decline sharply at 15 and 20% LF. Drying shrinkage was found to increase with the increase in LF content. Expansion exhibited little variation between 0 and 10% LF and an increase for replacement above 15% LF. These results are discussed in terms of the formation of hydration products and self-desiccation due to hydration.

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