Macro-Meso Structure Performance of Foamed Asphalt Cold RecycledMixture with Different Curing Methods

Abstract

Abstract: In order to make the indoor accelerated curing method of foamed asphalt cold recycled mixture more realistically simulate the actual curing conditions in the field,based on the moisture content test,mechanical properties and fatigue test,the moisture content,splitting strength,penetrating shear strength and unconfined compressive strength of the foamed asphalt cold recycled mixtures with 5 curing methods were studied.And the differences in the early strength,medium and long-term mechanical strength,and fatigue performance of foamed asphalt cold recycled mixtures with different curing methods were compared.Then X-Ray CT was used as platform to study the distribution characteristics of the fine and microscopic three-dimensional void structure of foamed asphalt cold recycled mixtures with different curing methods.The test results show that the long-term mechanical strength and fatigue life of the five types of foamed asphalt cold recycled mixtures are ranked as follows:open curing >Marshall in-mold curing >semi-closed curing >combined curing >closed curing.There are obvious differences in the fine and microscopic void structure.The fine-micro void gradation,average void diameter,maximum void diameter,mechanical properties,and fatigue life of the foamed asphalt cold recycled mixtures are well fitted under different curing methods.The semi-closed curing condition at 40 ℃+36 h is recommended to simulate the early (from 7 d to 14 d) on-site curing conditions before the overlay is overlaid.The 40 ℃ semi-closed curing for 36 h+the fully closed curing for 72 h is used as the medium and long-term accelerated indoor curing method for foamed asphalt cold recycled mixture.

Key words: road engineering, foamed asphalt cold recycled mixture, curing method, mechanical strength, fatigue performance

CLC Number:

U414.1

WANG Yunan, LYU Weibang. Macro-Meso Structure Performance of Foamed Asphalt Cold RecycledMixture with Different Curing Methods[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 330-339.

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