Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories (2020) / Chapter Skim
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9 C H A P T E R 2 This chapter presents results of the literature review of practices for fabricating specimens for performance testing in laboratories and covers a discussion of various asphalt performance tests and a review of the impact of specimen fabrication practices on performance test results. Topics addressed as part of the specimen fabrication practices include sampling location, mixture type, conditioning protocol (aging and moisture)
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10 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Resilient Modulus Testing The resilient modulus (MR) test (ASTM D7369)
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Literature Review of Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories 11 Poisson's ratios of asphalt mixtures. The tensile creep and strength have been used to estimate thermal cracking potential.
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12 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories also an APA junior that is a smaller version of the APA. The APA apparatus applies 8,000 repetitive linear wheel loads of 445 ± 422 N (100 ± 5 lb)
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Literature Review of Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories 13 Sampling State DOTs employ various sampling techniques for quality assurance. The goal is to get an uncontaminated, representative sample of the final product in the field.
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14 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Conditioning Procedures Aging The effects of aging on asphalt mixtures and its implication on cracking performance have been established. Earlier efforts to simulate mixture aging in the laboratory led to the development of the AASHTO R30 standard specification.
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Literature Review of Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories 15 vacuum saturation with multiple freeze–thaw cycles. The study reported that there was no evidence of moisture damage to mixtures subjected to only vacuum saturation; however, damage became more severe with an increase in number of freeze–thaw cycles even with lower saturation levels.
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16 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Solaimanian et al.
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Literature Review of Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories 17 Marshall hammer were greater than those of specimens prepared with 150 mm (6 in.) diameter and compacted with a gyratory compactor.
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18 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Anisotropy Over the years, the effect of anisotropy in fabrication of test specimens has been neglected. A few studies have been conducted to evaluate whether the anisotropic effect is significant.
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Literature Review of Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories 19 Table 2. Effect of mixture type.
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20 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories References Major Findings Performance Test Employed Coplantz and Newcomb (1988) There is no evidence of moisture damage to mixtures subjected to only vacuum saturation; however, damage becomes more severe with increase in the number of freeze–thaw cycles even with lower saturation levels.
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Literature Review of Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories 21 References Major Findings Performance Test Employed Consuegra et al.
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References Major Findings Performance Test Employed Marasteanu et al.
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Literature Review of Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories 23 References Major Findings Performance Test Employed Bonaquist (2011) Specimen age does not affect the dynamic modulus and flow number test (over the range of 5 to 200 days included in this study)
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