The Florida Slab Beam (FSB) has been developed by the Florida Department of Transportation (FDOT) to be used for short-span bridges [less than about 19.8 m (65 ft) long]. The FSB system consists of shallow precast, prestressed concrete inverted-tee beams that are placed adjacent to each other and then involve reinforcement and concrete being placed in the inner joints and deck all in one single cast. Ultra-high-performance concrete (UHPC) is becoming more widely used in bridge construction applications as a result of its remarkable structural performance. Many departments of transportation have tested and deployed the use of UHPC in bridges around the United States. Most of these applications have been to connect precast members (e.g., slabs to beams and slabs, adjacent beams, caps to columns, etc.). A modified FSB design is desired to eliminate the cast-in-place (CIP) deck and allow for UHPC to be used in the joint region, which will allow for accelerated construction and decrease the impact of construction on traffic. Different joint details and cross-section geometries were analyzed and experimentally evaluated to determine feasible joint details with UHPC for slab beam bridges used in accelerated construction. Results from numerical modeling, strength, and fatigue experimental testing of the transverse joint performance of four different UHPC joints in two different depth slab beam bridges are presented. Straight-side and shear-key UHPC joint details were found to behave similar to or better than the current FSB joint detail.

Off-site construction (OSC) is recognized for its potential to improve productivity, quality, safety, and sustainability. However, these benefits are often not fully realized because manufacturing principles and their effects on subsequent stages remain insufficiently understood and managed as an integrated production system. In addition, OSC complexity creates the need for structured approaches that support implementation and progressive improvement. Existing approaches remain limited in their ability to jointly assess these interdependent processes, clearly define maturity progression, and provide an integrated basis for improvement. This study addresses this gap by developing an integrated maturity assessment for manufacturing, logistics, and assembly (MLa) in OSC. The research followed five-stages: comprehensive literature review, expert-based triangulation, AHP-based weighting, maturity-level conceptualization, and feasibility assessment through a case study. The proposed assessment comprises 7 variables and 56 indicators. The results show that workplace configuration management and process orientation are foundational dimensions, while capacities, management practices, and management capabilities enable MLa-operationalization, and sustainability and CITs applications represent advanced maturity conditions. The weighting structure was established using the Chilean AEC industry as the reference context, and the case study provided preliminary evidence of feasibility and applicability of the assessment in diagnosing maturity conditions and identifying improvement paths for integrated MLa-operations in a real OSC company.