详情

原文传递 LABORATORY DETERMINATION OF THERMAL PROPERTIES OF ASPHALT MIXTURES BY TRANSIENT HEAT CONDUCTION METHOD.

题名：	LABORATORY DETERMINATION OF THERMAL PROPERTIES OF ASPHALT MIXTURES BY TRANSIENT HEAT CONDUCTION METHOD.
作者：	Fwa-TF; Low-BH; Tan-SA
关键词：	LABORATORY-TESTS; THERMAL-CONDUCTIVITY; DIFFUSIVITY-; ASPHALTIC-MIXTURES; TRANSIENT-HEAT-CONDUCTION-METHOD; THEORETICAL-ANALYSIS; COMPARISONS-; TEST-METHODS; ACCURACY-
摘要：	A laboratory procedure for determining the thermal conductivity (k) and diffusivity (alpha) of asphalt mixtures by means of a transient heat conduction experiment is described. It is first established that the plane wall theory of heat conduction can be applied to a finite-slab problem if the thickness-to-width ratio is kept within 0.2. The main concept of the proposed approach is to determine the k and alpha values that would match the theoretical temperature-time response with the measured response. Two different test procedures are studied: a vertical slab and a horizontal slab experiment. The experimental details involved in the two test procedures are described. The theoretical and measured temperature-time responses can be matched by one of the following two schemes: Scheme I matches the inflection points of the two temperature-time history curves, whereas Scheme II relies on a curve-fitting technique. Results of tests on two different dense-graded asphalt mixtures are used to evaluate the relative merits of the two experimental procedures and the two matching schemes. The results indicate that the vertical slab experiment and the Scheme I matching method yielded more accurate estimates of the k and alpha values. The computed values were found to compare well with reported values in the literature.
总页数：	Transportation Research Record. 1995. (1492) pp118-128 (8 Fig., 3 Tab., 17 Ref.)
报告类型：	科技报告