Discussion on Strength Characteristics and Mechanism of Cold MixAsphalt Mixture Based on Geopolymerization

Abstract

Abstract: Based on the Marshall stability (M_S) strength evaluation index,the macro-strength test analysis of cold mix asphalt mixture was carried out under the conditions of different aggregate additives,water immersion and different curing ages,etc..The research on the microstructure of the aggregate surface and the compression mechanism of geopolymer were studied by fluorescence microscope and discrete element simulation methods.It is found that M_S of cold mix increases first and then decreases with the increase of geopolymer content.The M_S value reaches at peak when the mass ratio of base asphalt and geopolymer additives is 4∶3,and in the range of 4∶2 to 4∶3,the residual stability (MS0) has the smallest reduction meanwhile the strength loss rate reaches the lowest.It is concluded that the optimal mass ratio of base asphalt and geopolymer additives is 4∶3,and the strength increases with the increase of the curing age,while the growth rate of the strength gradually decreases.The curing time should not be less than 3 d.Through fluorescence microscope analysis,it is seen that the asphalt on the surface of the aggregate is glued by the geopolymer.Through the Marshall stability virtual test analysis,the main force direction of the specimen is located directly below the pressure bearing point,the aggregate is externally tensioned and internally compressed during the compression process,and the gelled geopolymer can better resist vertical load and improve the compressive strength of cold mix.

Key words: geopolymer, cold mix asphalt mixture, stability, fluorescence microscope, discrete element (DEM)

CLC Number:

U414

ZHANG Yan, ZHOU Shengjie, FAN Liang. Discussion on Strength Characteristics and Mechanism of Cold MixAsphalt Mixture Based on Geopolymerization[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 340-349.

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