Abstract
Cross-tensioned concrete pavement can reduce transverse joints and cracks and improve the durability of the pavement, and the decrease in slab thickness can be achieved without damaging the performance of the pavement. However, the corrosion of the steel can cause serious damage to the pavement structure, resulting in higher maintenance costs and shorter service life. Basalt fiber-reinforced polymer (BFRP) has been proven to be an effective alternative in both jointed plain concrete pavement (JPCP) and continuously reinforced concrete pavement (CRCP) due to its lightweight and corrosion-resistant properties. In this paper, a systematic theoretical method for determining the prestress loss of BFRP tendons in cross-tensioned concrete pavement was proposed, with the impact of the slab width and distribution angle of the prestressed tendon on the prestress loss being studied and compared to the results of traditional steel strands. Results showed that the proportion of the prestress loss due to anchorage deformation and prestress retraction in the prestressing stage rose with the increase in distribution angle and the decrease in slab width, while the prestress loss during the in-service stage was a constant value for both BFRP tendons and steel strands. The prestress loss of BFRP tendons was far lower than that of steel strands in both prestressing stage and in-service stage for a given slab width (3 m, 4.5 m, 9.0 m, 12.75 m) and distribution angle (20°, 25°, 30°, 35°, 40°, 45°), and the difference ranged from 6.4% to 16%, signifying the feasibility of BFRP tendons in cross-tensioned concrete pavement. Overall, the smaller the slab width, the greater the difference of the prestress loss between BFRP tendons and steel strands.
Highlights
Transverse joints in jointed plain concrete pavement (JPCP) can lead to several distresses, i.e., pumping, spalling, corner breaks, and even faulting, if they are not treated appropriately.Cross-tensioned concrete pavement has been proposed as an effective solution in enhancing the crack resistance of concrete pavement in order to improve the durability of concrete pavement and reduce the number of transverse joints.Pre-compression stress can be produced in the concrete slab by imposing an external tensioning to the reinforcement tendon, counteracting the flexural and tensile stress caused by the traffic load and environmental factors; as a result, the crack resistance and durability of the concrete pavement can be significantly improved [1,2]
This paper proposed a detailed theoretical method and calculation process for determining the prestress loss of the basalt fiber-reinforced polymer (BFRP) tendon, a corrosion-resistant and lightweight material, in cross-tensioned concrete pavements with the consideration of the unique relaxation properties of BFRP to improve the durability of the pavement structure
The conclusions are summarized as follows: (1) For both BFRP tendons and steel strands, the prestress loss σl1 decreased and σl2 increased with the increase of the slab width at a given distribution angle of the prestressed tendon, resulting in a lower proportion of σl1 in the prestress loss during the prestressing stage
Summary
Transverse joints in jointed plain concrete pavement (JPCP) can lead to several distresses, i.e., pumping, spalling, corner breaks, and even faulting, if they are not treated appropriately.Cross-tensioned concrete pavement has been proposed as an effective solution in enhancing the crack resistance of concrete pavement in order to improve the durability of concrete pavement and reduce the number of transverse joints.Pre-compression stress can be produced in the concrete slab by imposing an external tensioning to the reinforcement tendon, counteracting the flexural and tensile stress caused by the traffic load and environmental factors; as a result, the crack resistance and durability of the concrete pavement can be significantly improved [1,2]. Transverse joints in jointed plain concrete pavement (JPCP) can lead to several distresses, i.e., pumping, spalling, corner breaks, and even faulting, if they are not treated appropriately. Cross-tensioned concrete pavement has been proposed as an effective solution in enhancing the crack resistance of concrete pavement in order to improve the durability of concrete pavement and reduce the number of transverse joints. Pre-compression stress can be produced in the concrete slab by imposing an external tensioning to the reinforcement tendon, counteracting the flexural and tensile stress caused by the traffic load and environmental factors; as a result, the crack resistance and durability of the concrete pavement can be significantly improved [1,2].
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