Punchout study for continuously reinforced concrete pavement containing reclaimed asphalt pavement using pavement ME models
23 Aug 2020-International Journal of Pavement Engineering (Taylor & Francis)-Vol. 21, Iss: 10, pp 1199-1212
TL;DR: The restricted use of reclaimed asphalt pavement (RAP) in hot mix asphalt (HMA) motivates the use of RAP in portland cement concrete (PCC) as an aggregate replacement as discussed by the authors.
Abstract: The restricted use of reclaimed asphalt pavement (RAP) in hot mix asphalt (HMA) motivates the use of RAP in portland cement concrete (PCC) as an aggregate replacement. The addition of RAP causes si...
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TL;DR: In this paper, a life cycle assessment to compare an RCA-based portland cement concrete (RCA-PCC) pavement and a plain PCC pavement (i.e., without RCA) from all three aspects of sustainability (e.g., economic impact, social impact, and environmental impact) was carried out using an economic input-output life cycle assess (EIO-LCA) approach.
97 citations
TL;DR: In this paper, the potential of RCCP mixes containing 50% RAP via including various industrial and agricultural wastes such as Silica Fume, Fly ash, and Sugarcane ash as partial replacement of conventional cement.
Abstract: Asphalt pavement recycling has become a common practice across the globe and has been successfully employed in construction of new pavements. While several studies considered utilization of reclaimed asphalt pavement (RAP) aggregates for flexible and rigid pavements, very few attempted its possibility for roller compacted concrete pavements (RCCP). Additionally, studies on the possibility of enhancing the proportion of RAP for RCCP are very scanty. The present study is an attempt to increase the potential of RCCP mixes containing 50% RAP (dust contaminated & stiffened asphalt coated: 50RAP via including various industrial and agricultural wastes such as Silica Fume, Fly ash, and Sugarcane ash as partial replacement of conventional cement. It was observed that the inclusion of the stated admixtures had an insignificant effect on the density of the fresh RCCP mixes, however, increased the moisture demand considerably. In fact, the results firmly indicated the potential of silica fume for RAP-RCCP blends, as, it not only enhanced the physical and mechanical properties, but found to improve the durability of RCCP mixes considerably. Also, utilization of silica fume was found to be economical & environmentally friendly amongst all wastes: with reduced initial construction cost & CO2 emissions by up to 8.4% & 9.7%. As far as the other industrial wastes are concerned, 15% fly ash could also be utilized for producing sustainable RCCP mixes, whereas, higher dosage of fly ash (30%) and sugarcane ash (10 & 15%) may be employed as base layer material of conventional concrete pavements.
60 citations
TL;DR: In this article, the influence of aging/rejuvenation on the bonding performance of asphalt binder has not been fully understood, and the results in this study can help to better understand the impact of aging and rejuvenation on asphalt bond performance.
51 citations
TL;DR: In this article, the authors developed an innovative fracture test using the semicircular bending (SCB) geometry to characterize the two-parameter fracture properties (TPFP) of concrete (critical stress intensity factor, K Ic s, and critical crack tip opening displacement, CTOD c ).
Abstract: Although few available test results showed that portland cement concrete containing reclaimed asphalt pavement (RAP-PCC) can have equivalent (or even improved) fracture properties and ductility compared to plain PCC, the limitations of the existing experimental methods to test the two-parameter fracture properties (TPFP) of concrete (critical stress intensity factor, K Ic s , and critical crack tip opening displacement, CTOD c ) have hindered an effective characterization of RAP-PCC's fracture properties and ductility. To provide an easy but effective approach, this paper developed an innovative fracture test using the semicircular bending (SCB) geometry to characterize the TPFP of the studied RAP-PCC mixtures. Based on the results, it is confirmed that addition of RAP improves PCC's CTOD c and G f , despite of a reduction in mechanical strengths. The material length, Q , of the RAP-PCC mixture is statistically higher than that of the plain PCC, suggesting that RAP-PCC is a more ductile material. Besides, the theoretical tensile strength, tensile MOE, and bilinear softening curve of the RAP-PCC can be easily obtained using the developed SCB fracture test.
47 citations
TL;DR: In this paper, jointed reinforced slabs made with concrete containing MgO expansion agent (MEA) were investigated to mitigate concrete pavement cracking at high-altitude locations.
41 citations
References
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TL;DR: In this paper, the effects of roller compacted concrete (RCC) characteristics on their fracture behavior in both pure mode I and II are experimentally investigated, and the fracture toughness results revealed concrete mix specifications had a noticeable impact on the cracking initiation of RCC and the effect of substituting of waste materials with natural aggregates was found to be negative, although their behavior was still comparable to those obtained for control mixes.
144 citations
TL;DR: In this article, the authors present a life cycle inventory analysis of reclaimed asphalt pavement (RAP) in portland cement concrete (PCC) as an aggregate replacement for pavement applications.
90 citations
TL;DR: In this article, the potential use of reclaimed asphalt pavement (RAP) as an aggregate in portland cement concrete (PCC) was investigated, and the results showed that RAP aggregate had enhanced ductility and showed excellent shatter resistance properties.
Abstract: The main objective of this research is to investigate the potential use of reclaimed asphalt pavement (RAP) as an aggregate in portland cement concrete (PCC). RAP aggregate finer than 4.75 mm (#4) sieve was treated as fine materials while those particles passing 19.05 mm (3-quarters of an inch) and retained on #4 sieve were treated as coarse aggregates. One set of concrete cylinders was prepared using 100, 75, 50, 25, and 0 percent RAP as coarse aggregate while fine aggregate was 100 percent RAP. Another set of samples was made using 100, 75, 50, 25, and 0 percent RAP as fine aggregate while coarse aggregate was 100 percent RAP. Samples were prepared using water-cement ratios of 0.40 and 0.50. In addition, control mixtures containing 100 percent conventional aggregate were made for comparison purposes. Higher compressive strength was obtained as the percentage of RAP aggregate was decreased for all mixtures. The control specimens yielded the highest compressive strength. However, the strength was sufficient to qualify the use of RAP aggregate in concrete applications such as barriers, sidewalks, driveways, pipes, curbs, and gutters. Furthermore, mixtures containing RAP aggregate had enhanced ductility and showed excellent shatter resistance properties. Additional studies should investigate the use of additives and admixtures with RAP aggregate.
87 citations
TL;DR: In this article, the authors quantified and compared the interfacial transition zone (ITZ) for mortar with RAP aggregates relative to dolomite aggregates through image analysis of backscattered electron micrographs.
85 citations
TL;DR: In this paper, the authors investigated whether partial replacement of virgin coarse aggregate by coarse RAP is a practically viable option to formulate PCC paving mixtures, and they showed that replacing virgin coarse aggregates by RAP with sufficient intermediate size particles offers the benefits of achieving dense combined aggregate gradation.
78 citations