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6862056 
Journal Article 
The characteristics of air void and frost resistance of RCC with fly ash and expansive agent 
Gao, Peiwei; Wu, SX; Lin, Phua; Wu, Zru; Tang, Mshu; , 
2006 
Yes 
Construction and Building Materials
ISSN: 0950-0618
EISSN: 1879-0526 
ELSEVIER SCI LTD 
OXFORD 
586-590 
In order to assure the outer concrete of Longtan dam in China possesses excellent of frost resistance, the losses of strength, mass and air void characteristics of roller compacted concrete (RCC) containing fly ash, superplasticizer and a novel MgO-bearing expansive agent (HNM) were studied using the freezing-thawing method ASTM C666. The results show that there is a linear correlation between strength and mass losses in RCC subjected to cycles of freezing and thawing.There is a relationship between the air void spacing factor and the frost resistance of RCC. However, for RCC containing fly ash and superplasticizer a spacing factor of 0.25 mm is not necessary. Using a water:binder ratio of 0.48 in RCC containing 50% fly ash and 8% HNM a durability factor of over D-300 can be achieved provided the spacing factor is less than 0.4 mm. (c) 2005 Elsevier Ltd. All rights reserved.