Effect of Mix Parameters on the Dynamic Mechanical Properties of Cement Asphalt Mortar

AbstractIn this paper, the effects of key mix parameters, including asphalt–cement ratio (A/C), water–cement ratio (W/C), and sand–cement ratio (S/C), on the dynamic mechanical properties of the cement asphalt (CA) mortar used in the ballastless slab track of high-speed rail were investigated by dyn...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2017-08, Vol.29 (8)
Main Authors: Fang, Lei, Yuan, Qiang, Deng, Dehua, Pan, Yunrui, Wang, Yong
Format: Article
Language:English
Subjects:
Asphalt
Cements
Dynamic mechanical properties
Mortars
Parameters
Railway tracks
Technical Papers
Thermal analysis
Water-cement ratio
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Summary:AbstractIn this paper, the effects of key mix parameters, including asphalt–cement ratio (A/C), water–cement ratio (W/C), and sand–cement ratio (S/C), on the dynamic mechanical properties of the cement asphalt (CA) mortar used in the ballastless slab track of high-speed rail were investigated by dynamic mechanical thermal analysis (DMTA). Results showed that storage modulus (E′) increased with increased S/C ratio and decreased A/C and W/C ratios. The damping ability of CA mortar, which is characterized by tanδ, increased with increased A/C and W/C ratios. In comparison with Type-II CA mortar which has a lower A/C ratio, tanδ of Type-I CA mortar with a higher A/C ratio presented a different dependency on the S/C ratio. Relationships between dynamic mechanical properties (E′ and tanδ) and volume fraction of phases in CA mortar were quantitatively established.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0001913