Significant Findings from Full-Scale Accelerated Pavement Testing (2004) / Chapter Skim
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37 CHAPTER FOUR EVALUATION OF MATERIALS AND TESTS INTRODUCTION Full-scale APT programs worldwide have produced significant findings comparing and evaluating pavement material response and performance. The primary goal of most programs is to evaluate new, innovative, recycled, materials, with validation of traditional materials as a secondary goal.
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38 – Flexural strength and stiffness, together with compressive strength, were the primary items that were evaluated for the purposes of controlling the concrete materials. – In the field, the FWD was the primary tool used to gain insight into the characteristics of the pavement structure.
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39 testing were also included in this study. Conventional mixtures with two different filler contents and five different binders, including one modified with styrene butadiene styrene (SBS)
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40 this material must be used on relatively stiff supporting layers. On a deformable supporting layer, this type of mixture in a thin layer offered no improvement in performance, but performance benefits increased rapidly with thickness.
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41 amplified for coarse-graded mixtures. For rutting performance, field and laboratory mixture assessment again agreed in terms of the effects of air void content, binder content, temperature, and gradation.
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42 FIGURE 11 Texas US-281 pavement structures tested with the TxMLS and the MMLS3 (Walubita et al.
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43 low-volume road networks. On these networks, thin AC layers or chip seals are usually only providing a surface that waterproofs the underlying base and/or subbases.
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44 scale loading and in static and dynamic triaxial tests (Theyse 1999)
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45 traffic; therefore, layer thicknesses of the different materials varied. Granular and soil–cement base materials were compared with a third combination of a gravel–cement base with a soil–cement subbase.
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46 cility and full-scale trucks on a low-volume road. This study focuses on the development of a mechanistic– empirical pavement design procedure and guidelines for truck load restrictions during spring thaws.
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