Low-Temperature Performance and Damage Constitutive Model of Eco-Friendly Basalt Fiberâ»Diatomite-Modified Asphalt Mixture under Freezeâ»Thaw Cycles.
Materials (Basel)
; 11(11)2018 Oct 31.
Article
in En
| MEDLINE
| ID: mdl-30384478
ABSTRACT
Asphalt pavement located in seasonal frozen regions usually suffers low-temperature cracking and freezeâ»thaw damage. For this reason, diatomite and basalt fiber were used to modify asphalt mixtures. An indirect tensile test was used to determine the low-temperature performance of the asphalt mixture. The influences of freezeâ»thaw (Fâ»T) cycles on strength, tensile failure strain, stiffness modulus, and strain energy density were analyzed. The variation of the stressâ»strain curve under Fâ»T cycles was analyzed. The stressâ»strain curve was divided into a linear zone and nonlinear zone. The linear zone stress ratio and linear zone strain ratio were proposed as indexes to evaluate the nonlinear characteristics of the stressâ»strain curve. The results show that the basalt fiberâ»diatomite-modified asphalt mixture had better low temperature crack resistance and antifreezeâ»thaw cycles capacity compared to the control asphalt mixture. The Fâ»T cycles made the nonlinear characteristics of the stressâ»strain relationship of the asphalt mixture remarkable, and also decreased the linear zone stress ratio and linear zone strain ratio. The damage constitutive model established in this paper can describe the stressâ»strain relationship after Fâ»T damage well.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Journal:
Materials (Basel)
Year:
2018
Document type:
Article
Affiliation country:
China