Flexural fatigue evaluation of cement-treated mixtures of reclaimed asphalt pavement and crushed aggregates

López, Mario Alexander Castañeda; Fedrigo, William; Kleinert, Thaís Radünz; Matuella, Matheus Ferreira; Núñez, Washington Peres; Ceratti, Jorge Augusto Pereira

doi:10.1016/j.conbuildmat.2017.10.003

Cited by 36 publications

(21 citation statements)

References 13 publications

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“…They kept about 10% of their initial stiffness after 10 years, even with the addition of a cold recycled cement-treated subbase layer in the structure. It is worth noting that Castañeda López et al [6] studied the laboratory fatigue behavior of mixtures made of RAP, aggregates and cement, reporting the superior behavior of a mixture with 4% cement and 50% RAP, similar to the present one. Furthermore, Fedrigo et al [12] reported that the laboratory fatigue behavior of RAP, soil and cement mixtures improved with increasing RAP contents.…”

Section: Crctmsupporting

confidence: 79%

“…The flexural tensile strain at the break of the studied CRCTMs was presented in Table 2 (Section 2.2). Such values are higher than those typically observed in the literature for traditional cement-treated materials due to the presence of RAP in the mixtures, which makes them more flexible [6,12].…”

Section: Methodscontrasting

confidence: 53%

“…Flexural static and cyclic (fatigue) tests were performed using the four-point bending test configuration described by Castañeda López et al [6]. Flexural static tests were performed following the National Cooperative Highway Research Program (NCHRP) [21] test method for cement-treated materials.…”

Section: Methodsmentioning

confidence: 99%

“…It is highlighted that the SAPEM transfer functions for chemically stabilized materials are strain-based (computed strain to strain at break ratio), and different from the MeDina model (stress-based). Some studies indicate that strain-based models are preferable for such materials [6,[27][28][29]. The flexural tensile strain at the break of the studied CRCTMs was presented in Table 2 (Section 2.2).…”

Section: Methodsmentioning

confidence: 99%

“…The number of studies on the fatigue of CRCTMs is limited [6][7][8][9][10][11][12][13][14], and some factors affecting it are still not completely understood. For instance, the effect of RAP, since previous research reports either better [6,12] or worse [10,11,14] fatigue behavior with increasing RAP contents. Moreover, most researchers used 28-day fatigue tests since it is a consensus that cement virtually reaches its maximum strength after such an age.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue of Cold Recycled Cement-Treated Pavement Layers: Experimental and Modeling Study

et al. 2023

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Fatigue is the main design criterion for cold recycled cement-treated mixtures (CRCTMs). However, the literature shows that the fatigue behavior of such mixtures is still not well known. For example, the effect of increasing reclaimed asphalt pavement (RAP) contents is yet a topic of discussion. This experimental and modeling study helps fill knowledge gaps on CRCTM fatigue behavior using long-term curing fatigue tests and three design methods currently being used in different countries. The objectives of this study were: (1) to characterize the mechanical and fatigue behavior of mixtures of RAP, aggregates and cement; (2) to evaluate the fatigue life of pavements with base and subbase layers of such mixtures using the novel Brazilian design method (MeDiNa); and (3) to compare the results with those obtained using the South African Pavement Engineering Manual (SAPEM) transfer functions and the American Association of State Highway and Transportation Officials AASHTOWare Pavement Mechanistic-Empirical Design (PMED) software. The mixtures were tested in the laboratory using flexural static and cyclic tests, and the required parameters to use the methods were obtained. Experimental results and modeling demonstrated a superior fatigue behavior of recycled layers with higher RAP contents. On the other side, layers with lower RAP contents abruptly lost stiffness in short periods, making thicker structures necessary. Therefore, using high RAP contents is not only a sustainable practice, but also a technical benefit. The equivalent single axle loads obtained using the SAPEM were higher than those obtained using MeDiNa, while the PMED ones were higher than both previous methods. Despite the inherent differences, this suggests that MeDiNa is more conservative. It also highlights the importance of calibration based on long-term pavement performance data.

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Section: Crctmsupporting

confidence: 79%

Section: Methodscontrasting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%