### Abstract

Rational analyses of pavement response require knowledge of the thermal properties of asphalt mixtures. These properties have not been reported thoroughly in the literature and researchers typically depend on assumed values. In the first part of this study, a laboratory test was developed to determine the thermal coefficients of expansion and contraction of several types of asphalt mixtures. The thermal coefficient values were dependent on material type and method of compaction. The coefficients of thermal expansion were slightly larger than the coefficients of thermal contraction. Hot mix asphalt (HMA) showed lower thermal coefficients than the asphalt rubber mix. In the second part of the study, a heat flow computer program was used to simulate lab temperature measurements and calculate the volumetric heat capacity (C) and thermal conductivity (k) values of HMA. No unique C and k values were found, but a linear relationship between C and k values was obtained. A band of possible optimum C and k values was developed. The program was used to estimate the required stabilization times to change test specimen temperatures according to the dynamic modulus (E*) test protocols.

Original language | English (US) |
---|---|

Pages (from-to) | 118-126 |

Number of pages | 9 |

Journal | Journal of Testing and Evaluation |

Volume | 33 |

Issue number | 2 |

State | Published - Mar 2005 |

### Fingerprint

### Keywords

- Asphalt mixture
- Asphalt rubber mixture
- Heat flow
- Thermal coefficient
- Thermal conductivity
- Volumetric heat capacity

### ASJC Scopus subject areas

- Materials Science (miscellaneous)

### Cite this

*Journal of Testing and Evaluation*,

*33*(2), 118-126.

**Determination of thermal properties of asphalt mixtures.** / Mamlouk, Michael; Witczak, Matthew W.; Kaloush, Kamil; Hasan, Nasreen.

Research output: Contribution to journal › Article

*Journal of Testing and Evaluation*, vol. 33, no. 2, pp. 118-126.

}

TY - JOUR

T1 - Determination of thermal properties of asphalt mixtures

AU - Mamlouk, Michael

AU - Witczak, Matthew W.

AU - Kaloush, Kamil

AU - Hasan, Nasreen

PY - 2005/3

Y1 - 2005/3

N2 - Rational analyses of pavement response require knowledge of the thermal properties of asphalt mixtures. These properties have not been reported thoroughly in the literature and researchers typically depend on assumed values. In the first part of this study, a laboratory test was developed to determine the thermal coefficients of expansion and contraction of several types of asphalt mixtures. The thermal coefficient values were dependent on material type and method of compaction. The coefficients of thermal expansion were slightly larger than the coefficients of thermal contraction. Hot mix asphalt (HMA) showed lower thermal coefficients than the asphalt rubber mix. In the second part of the study, a heat flow computer program was used to simulate lab temperature measurements and calculate the volumetric heat capacity (C) and thermal conductivity (k) values of HMA. No unique C and k values were found, but a linear relationship between C and k values was obtained. A band of possible optimum C and k values was developed. The program was used to estimate the required stabilization times to change test specimen temperatures according to the dynamic modulus (E*) test protocols.

AB - Rational analyses of pavement response require knowledge of the thermal properties of asphalt mixtures. These properties have not been reported thoroughly in the literature and researchers typically depend on assumed values. In the first part of this study, a laboratory test was developed to determine the thermal coefficients of expansion and contraction of several types of asphalt mixtures. The thermal coefficient values were dependent on material type and method of compaction. The coefficients of thermal expansion were slightly larger than the coefficients of thermal contraction. Hot mix asphalt (HMA) showed lower thermal coefficients than the asphalt rubber mix. In the second part of the study, a heat flow computer program was used to simulate lab temperature measurements and calculate the volumetric heat capacity (C) and thermal conductivity (k) values of HMA. No unique C and k values were found, but a linear relationship between C and k values was obtained. A band of possible optimum C and k values was developed. The program was used to estimate the required stabilization times to change test specimen temperatures according to the dynamic modulus (E*) test protocols.

KW - Asphalt mixture

KW - Asphalt rubber mixture

KW - Heat flow

KW - Thermal coefficient

KW - Thermal conductivity

KW - Volumetric heat capacity

UR - http://www.scopus.com/inward/record.url?scp=15844365859&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=15844365859&partnerID=8YFLogxK

M3 - Article

VL - 33

SP - 118

EP - 126

JO - Journal of Testing and Evaluation

JF - Journal of Testing and Evaluation

SN - 0090-3973

IS - 2

ER -