Development of an IDEAL cracking test for asphalt mix design and QC/QA

Zhou, Fujie; Im, Sungbin; Sun, Lijun; Scullion, Tom

doi:10.1080/14680629.2017.1389082

Cited by 174 publications

(84 citation statements)

References 2 publications

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“…Lower percent materials loss values indicate that HMA mixtures are more durable (more resistant to breaking down under loading). These finding have been made in other research studies ( 24 ).…”

Section: Description Of Materialssupporting

confidence: 89%

Assessment of the Impact of Fiber Types on the Performance of Fiber-Reinforced Hot Mix Asphalt

Alfalah

Offenbacker

DeCarlo

et al. 2020

Transportation Research Record

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This study aims to evaluate the impact of fiber types on the performance of hot mix asphalt (HMA) mixtures. Specifically, the impacts of fiber type on HMA mix design and laboratory performance are investigated. Four types of fiber (fiberglass, basalt, carbon, and polyolefin/aramid blend) were used to produce four fiber-reinforced HMA mixes, and a control mix without fibers was also prepared. The fiber dosage rates used in this study were 0.16% (fiberglass, basalt, and carbon) and 0.05% (polyolefin/aramid) by total mixture weight, based on manufacturer recommendations. Two mixing procedures for introducing fibers into HMA were also evaluated: dry and 15-s dispersion methods. The dry method involved mixing the fibers with aggregates before the addition of asphalt binder while the 15-s dispersion method involved adding the fibers into the mix every 15 seconds (as aggregates were coated by asphalt binder during the mixing process). All the HMA mixtures (unreinforced and fiber-reinforced) were then subjected to several different laboratory performance tests: dynamic complex modulus, Cantabro durability, asphalt pavement analyzer, flow number, and indirect tensile strength. Analysis of variance was conducted to evaluate statistically the impact of fibers on mix performance. Results showed that fibers affected the volumetric properties, mix durability, and rutting resistance of HMA mixes. It was also found that the process for introducing fibers into the mix (i.e., mixing method) affected the consistency of fiber-reinforced HMA samples. Overall, the results of this study showed that the use of fibers improved the rutting and durability performance of asphalt mixtures in the laboratory.

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Section: Description Of Materialssupporting

confidence: 89%

Assessment of the Impact of Fiber Types on the Performance of Fiber-Reinforced Hot Mix Asphalt

Alfalah

Offenbacker

DeCarlo

et al. 2020

Transportation Research Record

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“…The indirect tensile asphalt cracking test (IDEAL-CT) was carried out to evaluate the cracking resistance of asphalt mixtures with RAP. The IDEAL-CT, which was developed by Zhou [46], was conducted by similar procedures with the conventional indirect tensile strength test, as shown in Figure 3. The cylindrical specimens with a diameter of 150 mm and a thickness of 62 mm were used in this study.…”

Section: Indirect Tensile Asphalt Cracking Testmentioning

confidence: 99%

“…In addition, the shear stress (SS) results from the uniaxial penetration test and CT index results from the IDEAL cracking test were also plotted on the Y-axis and X-axis, respectively in order to develop the "SS-CT index performance-space diagram", as shown in Figure 16. Zhou [46] proposed three levels of CT index thresholds based on mixture gradation type (65, 105, 145 for dense-graded, superpave, and Stone Matrix Asphalt (SMA) gradation, respectively), which were identified on this plot. It can be seen from Figure 16 that the mixture performance also shifted to the upper-left section with an increasing RAP content.…”

Section: Performance-space Diagram Analysismentioning

confidence: 99%

Performance Characterization of Hot Mix Asphalt with High RAP Content and Basalt Fiber

Zhang

et al. 2020

Materials

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Incorporating reclaimed asphalt pavement (RAP) into asphalt mixtures achieves astonishingly environmental and economic benefits. However, there is hesitation to use higher RAP content due to the concern regarding the deterioration in pavement performance, especially the cracking resistance. Basalt fiber has been considered an effective additive to reinforce the performance of asphalt mixtures and, subsequently, the reinforcement effect is also expected for high-RAP content mixtures. Therefore, this study investigated the effect of basalt fiber on the pavement performance of asphalt mixtures with 0%, 30%, 40%, and 50% RAP contents against high-temperature performance, moisture susceptibility, low-temperature and intermediate-temperature cracking resistance, based on the wheel-tracking test, the uniaxial penetration test, the freeze-thaw splitting test, the low-temperature bending beam test, the semicircular bend fracture test and the indirect tensile asphalt cracking test, respectively. In addition, a performance-space diagram was developed to determine the mixture performance shift caused by basalt fiber. The results showed that adding basalt fiber compensated for the detrimental effect caused by RAP, leading to significant enhancement in moisture susceptibility and low- and intermediate-temperature cracking resistance of mixtures with high RAP content, along with the enhancement in high-temperature performance, indicating that basalt fiber can contribute to the use of high RAP content.

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“…The IDEAL cracking test (IDEAL-CT) is a simple (no drilling, cutting, gluing or notching of the specimens, etc. ), low variability (good reproducibility), and efficient test (test completion in less than 2 min) [ 35 ]. The dimensions of the specimens were normally 150 mm in diameter and 62 mm in thickness, as shown in Figure 3 .…”

Section: Test Methodsmentioning

confidence: 99%

Suitability of Fiber Lengths for Hot Mix Asphalt with Different Nominal Maximum Aggregate Size: A Pilot Experimental Investigation

Lou

Kang

et al. 2020

Materials

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Fiber length is a key parameter for the mixture design of basalt fiber-reinforced hot mix asphalt (HMA), which significantly affects the mix performance. To evaluate the suitability of fiber lengths for HMA with different nominal maximum aggregate size (NMAS), basalt fiber with the lengths of 3, 6, 9, 12, and 15 mm were selected for dense graded gradations with different NMASs (namely, SUP-13, SUP-20, and SUP-25), so as to prepare the fiber-reinforced HMA mixtures. Then, the mix performance was evaluated by an indirect tensile asphalt cracking test (IDEAL-CT), a four-point bending beam fatigue test, a wheel tracking test, a uniaxial penetration test, a low temperature bending beam test, and a freeze-thaw splitting test. Based on the performance results, the optimum fiber length for each mix gradation was proposed by the normalization method. The results showed that adding basalt fiber can enhance the comprehensive performance of all three types of HMA to a great extent. Furthermore, fiber length presented remarkable impact on the crack resistance, the fatigue resistance of the HMA, and the low temperature crack resistance, but it had limited influence on the high temperature deformation resistance, and water stability. The optimum fiber length for SUP-13, SUP-20, and SUP-25 was 6, 9, and 12 mm, respectively.

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Development of an IDEAL cracking test for asphalt mix design and QC/QA

Cited by 174 publications

References 2 publications

Assessment of the Impact of Fiber Types on the Performance of Fiber-Reinforced Hot Mix Asphalt

Assessment of the Impact of Fiber Types on the Performance of Fiber-Reinforced Hot Mix Asphalt

Performance Characterization of Hot Mix Asphalt with High RAP Content and Basalt Fiber

Suitability of Fiber Lengths for Hot Mix Asphalt with Different Nominal Maximum Aggregate Size: A Pilot Experimental Investigation

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