229 documents found, page 1 of 23
The use of bio-oil from biodiesel production for enhancing the bitumen healing
Cabette, Marina; Micaelo, Rui; Pais, Jorge C.Road pavements are exposed to traffic and temperature effects that produce distress, mainly cracking that leads to pavement failure, after which rehabilitation actions are necessary to extend pavement life. Bio-rejuvenators have been used to recover the bitumen properties lost due to fatigue of the asphalt mixtures and ageing due to temperature variations and oxidation. Thus, this paper investigates the healing...
Crumb rubber modified binders
Pais, Jorge C.; Poulikakos, Lily D.; De Maeijer, Patricia Kara; Schüwer, Nicolas; Cavalli, Maria Chiara; Cannone Falchetto, AugustoRILEM Technical Committee 279 WMR is dedicated to the Valorization of Waste and Secondary Materials for Roads. Its Task Group 2 investigated Crumb Rubber (CR) as an additive to enhance the performance of bitumen. CR recycled from end-of-life tires (ELTs) was chosen for this investigation because crumb rubber modified bitumen (CRMB) has been used to improve bituminous mixtures performance for fatigue and reflect...
Self-healing asphalt roads: Evaluation of calcium alginate capsules with Bio-Oil
Cabette, Marina; Micaelo, Rui; Pais, Jorge C.Incorporating extrinsic self-healing factors in road materials and pavements can transform the road construction and maintenance procebes by increasing their life span and eliminating or reducing the need for maintenance. One autonomic self-healing technology available for asphalt pavement is embedding in the material capsules containing rejuvenators. This work presents one production method for encapsulating r...
Structural assessment of pavements using a coreless GPR approach
Marecos, Vânia; Fontul, Simona; Solla, Mercedes; Antunes, Maria de Lurdes; Pais, Jorge C.The reliability of the estimated pavement moduli for structural assessment depends on the accuracy of layers thickness. In this paper, the thickness of the bituminous layer was estimated using a coreless Ground Penetrating Radar (GPR) approach: the Common Mid-Point method with Air-Coupled antennas (CMP-AC), by combining multiple GPR offset configurations. For each survey line, the thicknesses are estimated thro...
Wander effect on pavement performance for application in connected and autonomo...
Pais, Jorge C.; Pereira, Paulo A. A.; Thives, LiseaneConnected and Autonomous Vehicles (CAV) will change how road engineers design road pavements because they can position themselves within a traffic lane, keeping their position in the lane more precisely than human-driven vehicles. These vehicles will have lower lateral wandering, which can induce more damage to pavements, such as cracking and permanent deformation, than the conventional vehicles, with consequen...
Feasibility of using bio-oil from biodiesel production for bio-bitumen creation
Pais, Jorge C.; Santos, Caio Rubens; Cabette, Marina; Hilliou, L.; Ribeiro, Jorge; Wang, Hainian; Mohd Hasan, Mohd RosliBio-oil resulting from biodiesel production, currently used for energetic valorisation, can be added to the bitumen, producing a bio-bitumen and acting as a bitumen extender by reducing its viscosity. Thus, this paper analyzes the feasibility of using bio-oil to create bio-bitumen. Two base bitumen were used, namely, 0/10 and 35/50 pen bitumen, combined with bio-oil from biodiesel production content of up to 10...
Extrinsic healing of asphalt mixtures: a review
Cabette, M.; Pais, Jorge C.; Micaelo, R.When exposed to climate effects, the stiffness of the bitumen increases, decreasing its relaxation capacity and making the binder more fragile, promoting microcracks formation and cracking due to traffic. Effective maintenance strategies are necessary to ensure longevity and minimise the need for rehabilitation. Addressing the material’s durability is one efficient solution to extend the service life of roads. ...
A non-invasive and multi-scale approach to detect subsidence in pavements: InSA...
Alonso-Diaz, Alex; Solla, Mercedes; Fontul, Simona; Marecos, Vânia; Antunes, Maria de Lurdes; Pais, Jorge C.This paper presents a non-invasive and multi-scale approach to detect subsidence in a national road through the combination of complementary techniques, InSAR (Interferometric Synthetic Aperture Radar), FWD (Falling Weight Deflectometer) and GPR (Ground-Penetrating Radar). For the InSAR, the PSI (Persistent Scatter Interferometry) method was selected using Sentinel-1 images. The FWD measurements were collected ...
Mix design and physical and mechanical properties of pervious concretes
Ximenes, J.; Jesus, Carlos Manuel Gonçalves; Aguiar, J. L. Barroso de; Pais, Jorge C.Fast-growing climate changes are known to have diverse impacts worldwide, even in large cities. Pervious concrete can be a successful safety solution for increasingly frequent heavy rains and floods. This study focuses on achieving an optimized pervious concrete within the scope of international standards by analyzing concretes made with different W/C ratios and vibration times. The results of the study show th...
Propriedades de betão drenante em misturas com agregados reciclados
Ximenes, José; Uher, Vojtech; Jesus, Carlos Manuel Gonçalves; Aguiar, J. L. Barroso de; Pais, Jorge C.O presente trabalho estuda o desenvolvimento de betão drenante para aplicação em pavimentos rodoviários, através do estudo das suas características físicas e mecânicas, apoiado numa campanha de ensaios laboratoriais, de várias composições. Os materiais de pavimento rígido com betão drenante, após sua construção, sofrem um processo de degradação sob a ação do tráfego e das condições climáticas. Esse processo, qu...