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Influence of Layered Materials on Properties of Cement Stabilized Macadam

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Abstract:

To reduce shrinkage cracks of cement stabilized macadam base and prolong the life span of pavement, layered materials were mixed in cement stabilized macadam to improve its strength properties and crack resistance. In comparison with the blank test, the unconfined compressive strength increases with the addition of layered materials (weighed at 10% of the amount of cement), by 11.6% with palygorskite, 12.7% with kaolin and 8.9% with montmorillonite, respecetively, at the curing age of 28 days; dry-shrinkage coefficient reduces by 28.2% with palygorskite, 19.0% with kaolin and 14.2% with montmorillonite after 48 days, respecetively. Microstructure of cement pastes mixed with layered materials were observed by scanning electronic microscope. The result shows that more fibrous hydration products and a net-like microstructure exist in cement pastes with palygorskite. It may explain the maximum decrease in shrinkage cracks of palygorskite-mixed cement stabilized macadam.

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Periodical:

Advanced Materials Research (Volume 1095)

Pages:

254-257

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1095.254

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Online since:

March 2015

Authors:

Quan Hong Ma*, Mei Yan Qu, Xue Song Xu, Le Le Hu

Keywords:

Cement Stabilized Macadam Base, Crack Resistance, Kaolin, Layered Materials, Montmorillonite, Palygorskite, Strength Properties

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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