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Constitutive relations for bituminous concrete using double lap shear tests

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Abstract

The scope of this progress report was to a. investigate a new method for obtaining shear properties of bituminous concrete, b. obtain constitutive relations for fundamental properties using this method, c. show the sensitivity of the procedures, d. detect property variations as functions of source of asphalt and a small amount of latex additive, and e. demonstrate possible design use of the properties obtained. The method used was the double lap shear test, which has been used extensively for viscoelastic characterization of solid propellant, but which has not been used previously to characterize bituminous concrete. The results showed that the procedures can be used to better quantify the fundamental mechanical properties of bituminous concrete in shear and that highway design procedures can be improved by the use of these properties.

Résumé

L'essai de cisaillement avec double recouvrement, couramment utilisé pour la détermination des constantes viscoélastiques des propergols, a ici servi à déterminer les propriétés fondamentales en cisaillement d'un béton flexible. On a élaboré un programme de calculateur numérique afin d'établir les relations caractéristiques, et les évaluations statistiques, et d'opérer les conversions des modules et des coefficients depuis les essais à vitesse de chargement constante aux autres modes de chargement. Par ces procédés, on a évalué les différences de propriétés du béton dues uniquement au type d'asphate employé; du latex ajouté à l'un des asphaltes a servi à caractériser un troisième mélange. Les résultats montrent nettement et quantitativement une amélioration des propriétés du béton due à l'addition de latex. On donne des exemples d'application des données caractéristiques, avec les facteurs de variation de température dans le temps, aux calculs de stabilité des chaussées flexibles.

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Abbreviations

A, B:

constants numeric

a, b:

constants numeric

a T :

time-temperature shift factor numeric

CEM, CERM:

constant strain and constant strain rate moduli ksi

COC:

coefficient of correlation percent

CSC, CSRC:

constant stress and constant stress rate compliance 1.0/ksi

DEGF:

degrees of freedom numeric

DIS, DIT:

indicated deformation for secant and tangent moduli in

DMS, DMT:

machine deformation at secant and tangent moduli in

DS, DE* :

deviation of ultimate stress and strain, respectively percent

E:

Ultimate shear strain percent

F:

function of

FAD:

field average deviation percent

f, h:

constants numeric

N:

number of specimens numeric

NS:

specimen number numeric

P n , P w :

probability of null and working hypotheses percent

Q:

stress rate of loading psi/min

R:

strain rate of loading percent/min

S:

ultimate shear stress psi

S o :

constant stress level psi

SEC:

Ultimate secant modulus ksi

SF, TF:

secant and tangent force, respectively lb

STV:

Student t test value numeric

T:

temperature0F

t:

time min

TAN:

initial tangent modulus ksi

TTF:

time to failure min

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Authors and Affiliations

  1. College of Engineering at Texas A. & M. Univ., Texas, USA

    H. O. Fleisher

Authors
  1. D. Bynum Jr. BSIE
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  2. J. F. Evertson
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  3. H. O. Fleisher
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  4. D. R. Ray
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Additional information

The first accounts of comprehensive constitutive relations for bituminous concrete were published in the May 1971 issue of Materials and Structures—We are referring to the paper on split cylinder tests by Bynum, Agarwal, and Fleisher. It was therefore normal that we should publish here the present article, in which the authors give the constitutive relations for a new type of shear test on bituminous concrete with proposed design use of the results.

PE, Ph. D. in Interdisciplinary Engineering, Assistant Research Engineer in the Texas Engineering Experiment Station, College of Engineering and Member of the Graduate Faculty at Texas A. & M. University, College Station, Tex. 77843 at the time of this work, and now Manager of Research and Development at The Offshore Company in Houston, Tex.

BSME, Engineering Research Assistant in the College of Engineering at Texas A. & M. Univ. at the time of this work, and now Research Assistant at North Texas State University in Denton, Tex.

BSCE, MSCE, Engineering Research Associate in the College of Engineering at Texas A. & M. Univ. at the time of this work, and now First Lieutenant in U.S. Army, Viet Nam.

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Bynum, D., Evertson, J.F., Fleisher, H.O. et al. Constitutive relations for bituminous concrete using double lap shear tests. Mat. Constr. 5, 21–30 (1972). https://doi.org/10.1007/BF02479074

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