Accelerated testing of a recycled road structure made with reclaimed asphalt pavement material

Ungureanu, Dragoş; Ţăranu, Nicolae; Hoha, Didi; Zghibarcea, S; Isopescu, Dorina Nicolina; Boboc, Vasile; Oprişan, Gabriel; Scutaru, Maria Cristina; Boboc, Andrei; Hudisteanu, I

doi:10.1016/j.conbuildmat.2020.120658

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…To meet these demands, we aim to design and produce 3D printed prefabricated elements that are compatible with road construction projects. These elements will incorporate the latest advancements in material recycling technologies, contributing to environmentally friendly and cost-effective road construction practices [31][32][33][34].…”

Section: Future Research Directionsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Cost-Efficient 3D Printed Concrete Reinforced with Polypropylene Fibers

Ungureanu,

Onuțu,

Țăranu

et al. 2023

Buildings

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Studying emerging and cutting-edge digital construction techniques, especially the utilization of 3D printing for concrete/mortar materials, holds significant importance due to the potential benefits that these technologies might offer over the traditional approach of casting concrete in place. In this study, a mixture composed of Portland cement, water, sand, limestone filler and polypropylene fibers was utilized for 3D printed concrete production towards the sustainable constructions approach. The benefits that sustain this statement include reduced construction time and material requirements, diminished error and cost, increase in construction safety, flexibility of architectural design, and improved quality with much less construction cost and waste. The microstructure, fresh and hardened mechanical properties of the polypropylene fiber reinforced 3D concrete were investigated. The results indicated that it is essential to attain a slump measurement of approximately 40 mm and a slump flow within the range of 140 to 160 mm, as stipulated by relevant standards (ASTM C1437 and C230/C230 M), in order to create a 3D concrete mixture suitable for extrusion. Also, the effects of printing parameters, fiber dosage, material composition, and other factors on the 3D printed concrete strength were discussed, and the corresponding adjustments were addressed.

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Section: Future Research Directionsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Cost-Efficient 3D Printed Concrete Reinforced with Polypropylene Fibers

Ungureanu,

Onuțu,

Țăranu

et al. 2023

Buildings

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“…In the actual operation of the expansion joint, damage occurs due to the external effects of vehicles' impact, sunlight, rainwater, vehicle impact, etc., resulting in an unsmooth connection between the road surface and the bridge deck, reducing driving comfort, and affecting traffic operations. And, due to the dramatic increase in traffic in recent years, this has accelerated degradation in the performance of bridge expansion joints [1]. The role of expansion joints in the normal and safe operation of bridges cannot be overstated [2]; however, due to the short life of expansion joints, frequent maintenance and repair are required.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Finite Element Analysis on the Modification of Fast-Hardening Polymer Cement Composite Material Applied to the Anchorage Zone of Expansion Joint

Sun,

Yuan,

Sun

et al. 2023

Buildings

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Bridges’ expansion joints are prone to damage during operation, and repairing them often requires interruption of traffic, the impact of which can be minimized by using fast-hardening and early-strength expansion joint materials. In this study, a fast-hardening polymer cement composite (PCC) was developed using sulfate aluminate cement and ordinary silicate cement as binding agents and polymer powder as admixture. To improve the crack resistance of the material, several types of fibers were added and the effects of different fiber types and admixtures on the crack resistance of the material were compared using SCB tests. The results showed that the best effect of improving the crack resistance of concrete was achieved with a volume fraction of 0.5% of basalt fibers. Then, a test method for the interfacial shear properties of PCC materials and ordinary concrete was established, and the cohesive force model was selected as the interface simulation parameter for finite element analysis and compared with experimental data to verify its feasibility. Finally, based on the previously obtained PCC material parameters, a solid model of the expansion joint anchorage zone was established to study the mechanical properties of the expansion joint anchorage zone with the application of fast-hardening PCC material. This research provides a new way to develop fast-hardening and early-strength expansion joint materials with high crack resistance.

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“…This way, huge amounts of CDW materials are devaluated, and non-renewable natural resources (sand, gravel) are needlessly depleted. Based on their recycling or contamination potential, it makes sense to distinguish (and separate) the following CDW materials: concrete [5], clay bricks [6], tiles [7], aerated concrete [8], wood [9], glass [10], plastics [11], asphalt and bituminous materials [12], soil, thermal insulation materials [13], metals, and gypsum [14]. All these materials can be either recycled or contaminate the secondary materials when improperly sorted.…”

Section: Introductionmentioning

confidence: 99%

Computer Vision-Based Algorithms for Recognition of Construction and Demolition Waste Materials

Zbíral,

Nežerka

2023

Advances in Science and Technology

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The construction industry generates a significant amount of waste, posing challenges for efficient waste management and resource recovery. This paper presents a preliminary study on the use of lightweight computer vision (CV) algorithms for the automatic recognition of construction and demolition waste (CDW) materials. Utilizing image datasets acquired by drones, the study aims to develop strategies for distinguishing between individual CDW materials based on the mean intensity gradient, brightness, and relative representation of color channels. Results indicate that the proposed method can effectively recognize crucial CDW materials, paving the way for potential applications in industry and geodesy. Further research is needed to test additional materials and metrics to refine the method for practical implementation.

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Accelerated testing of a recycled road structure made with reclaimed asphalt pavement material

Cited by 11 publications

References 14 publications

Microstructure and Mechanical Properties of Cost-Efficient 3D Printed Concrete Reinforced with Polypropylene Fibers

Microstructure and Mechanical Properties of Cost-Efficient 3D Printed Concrete Reinforced with Polypropylene Fibers

Experimental Study and Finite Element Analysis on the Modification of Fast-Hardening Polymer Cement Composite Material Applied to the Anchorage Zone of Expansion Joint

Computer Vision-Based Algorithms for Recognition of Construction and Demolition Waste Materials

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