臺南都會區北外環道路－超高性能混凝土（UHPC）伸縮縫之國內首例應用

TAINAN URBAN ZONE NORTHERN OUTER RING ROAD: THE FIRST APPLICATION OF UHPC EXPANSION JOINTS IN TAIWAN

10.6652/JoCICHE.202203_34(1).0006

洪崇展(Chung-Chan Hung)；吳瑞安(Juian Wu)；蔣啟恆(Jambo C.H. Chiang)；陳明谷(Mingku Chen)；吳秉益(Ping Yi Wu)；顏誠皜(Cheng-Hao Yen)

都會區高架橋 ； 快速道路 ； 超高性能混凝土 ； 伸縮縫 ； expressway ； bridge engineering ； UHPC ； expansion joint

中國土木水利工程學刊

34卷1期（2022 / 03 / 01）

53 - 62

繁體中文

臺南都會區北外環道路銜接臺南核心市區與臺南科學園區特定區，可有效紓解附近道路與台1省道的交通雍塞，透過北外環道路的完成，銜接了既有台39、台86等道路，可建構臺南市核心區外環快速道路系統，此外，配合預留未來增設國道一號系統交流道的可行性，提供核心市區快速進入國道之新路徑。本工程路線沿鹽水溪堤岸而行，主線為高架橋梁之快速道路，本工程完工後，將成為大臺南地區交通之新動脈。為提升工程之永續性，本工程率先於國內橋梁工程，採用超高性能混凝土（Ultra-High Performance Concrete，簡稱UHPC）取代傳統高強度無收縮混凝土用於伸縮縫中。所採用國內自主開發之超高性能混凝土，具超高抗壓與抗拉強度，其內含之纖維可有效強化受拉與受壓韌性，提升開裂強度與控制裂縫發展，並改善傳統高強度砂漿或傳統混凝土之脆性開裂與剝落問題。除此之外，UHPC相關的耐久性指標（孔隙率、滲透性、氯離子擴散率、抗磨蝕等）都較傳統混凝土與高強度砂漿優異，可降低修繕頻率，進而延長橋梁生命週期。本文除了探討使用國內自主開發的UHPC於伸縮縫之有效性，並進一步說明使用UHPC於伸縮縫之施工流程，以及介紹國內外UHPC之相關工程案。針對UHPC伸縮縫後續之監測，研究團隊成員將利用非破壞檢測，持續追蹤UHPC伸縮縫之力學與耐久性質，並與其他使用高強度無收縮混凝土之伸縮縫進行比較。

Ultra-High Performance Concrete (UHPC) is a fiber-reinforced cementitious material, which is known for its superior mechanical properties, durability, and workability. Due to the high particle-packing density and addition of fibers, UHPC has the ability to inhibit the crack formation and possesses high tensile strength and ductility. Given this, the common weakness of conventional concrete and high-strength cement mortar, including brittle behavior and spalling, is greatly alleviated by using UHPC. In addition, UHPC is more durable than conventional concrete and high-performance concrete owing to the low water-to-binder ratio, high particle-packing density, and crack-resistant ability. As a result, the durability measures, including porosity, permeability, chloride ion diffusivity, and abrasion resistance, are substantially lower than those of conventional concrete materials, which can protect structures from harmful substances. The construction of Tainan Urban Zone Northern Outer Ring Road links the core urban area of Tainan and Southern Taiwan Science Park, which will effectively mitigate the traffic congestion between nearby roads and No. 1 Provincial Road. The existing routes such as No. 39 Provincial Road and No. 86 Provincial Road will be connected by the North Outer Ring Road. As a result, the convenient outer ring expressway system in the core area of Tainan metropolitan will be realized. The route of this project runs along the embankment of the Yanshui River, and the mainline consists of the viaduct. After the completion of this project, it will become an essential path in the Tainan metropolitan. In the third phase of the project, the construction and design units applied UHPC for the expansion joints in several bridge sections. It aimed to compare with other expansion joints using conventional high-strength non-shrinkage concrete to understand the performance of UHPC. In addition to reporting the expected effectiveness of UHPC in the new expansion joints, the paper also introduces the construction processes of the UHPC expansion joints. For the potential follow-up monitoring, it is expected to use non-destructive testing methods to continuously examine the mechanics and durability of the UHPC expansion joints and compare the results with other expansion joints using conventional high-strength non-shrinkage cement mortar.

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