## 2 Details of the CRCP Test Section with BFRP Bars  
The test section is 250 m long, as part of an existing three-lane concrete pavement on the G330 National Road from K200 + 400 to K200 + 650 in Zhejiang Province in China. Each lane is nominally 4 m wide on a 2% longitudinal grade. The two inside lanes were chosen to be part of the test section, which were reconstructed with CRCP containing BFRP reinforcement, while the outer lane (jointed plain concrete pavement, JPCP) was used for traffic during reconstruction. A longitudinal contraction joint in the 8 m-wide lane was not part of the design or construction process. One month after the construction of the CRCP section, a 10 cm-thick HMA layer was placed on top of both the CRCP lanes and the existing outer lane. Temperature sensors and pressure and strain gages were adopted in this test section to monitor the early age behavior of the CRCP with BFRP bars.  
The field CRCP test section was constructed in September 2014. A 15 cm-thick cement-stabilized subbase with 3% Portland cement and crushed stone was first constructed to provide uniform support. A 20 cm-thick cement-stabilized base with 5% Portland cement and crushed stone was then constructed next on top of the subbase. Next, a 26 cm-thick CRCP layer with a water/cement ratio of 0.38 given BFRP as both longitudinal and transverse reinforcement was constructed on top of the base layer, with a 6 cm-thick HMA binder layer given the nominal max aggregate size of 16 mm and a 4 cm-thick SBS-modified HMA layer given the nominal max aggregate size of 13 mm constructed one month after casting the CRCP layer. Between the CRCP and asphalt layer, there is a bonding layer consisting of 1 cm-thick SBS-modified asphalt with crushed stone distributed on it, casted a few hours before the construction of the asphalt layer. The layout of the CRCP test section with BFRP reinforcement is presented in Figure 1.  
The diameter of the longitudinal BFRP reinforcement was 12 mm, spaced at 8 cm with a reinforcement content of 0.50%, and placed at the mid-depth of the concrete slab--i.e., 13 cm deep from the top of the BFRP reinforcement to the CRCP surface. The diameter of longitudinal BFRP bars for this CRCP test section were smaller compared to traditional CRCPs with steel bars since the tensile strength of BFRP reinforcement is usually around 750 MPa, which is higher than the tensile strength of steel bars (550 MPa), while the elastic modulus of the BFRP reinforcement (40 GPa) is closer to that of concrete (30 GPa) than that of steel bars (210 GPa). As a result, a smaller bar size of the BFRP reinforcement can be used without significantly affecting the bond condition between the longitudinal reinforcement and the concrete. In addition, the diameter of the transverse BFRP reinforcements was 14 mm, spaced at 50 cm, and placed at a 30\({}^{\circ}\) angle to the horizontal (i.e., skewed), as shown in Figure 2. The material properties of the BFRP reinforcement were obtained from the manufacturer, and are compared to typical steel bars in Table 1.  
Figure 1: The layout of the continuously reinforced concrete pavement (CRCP) test section with basalt fiber-reinforced polymer (BFRP) bars.  
Figure 2: The layout of the longitudinal BFRP reinforcement on transverse chairs.