Research Impact As demonstration projects, the project team has succeeded in constructing FRP-SSC paving slabs for the road of a sewage treatment plant in Hong Kong as well as an FRP-reinforced seawater concrete structure in mainland China. FRP-SSC structures are also being used in two other demonstration projects in Hong Kong, for the reconstruction of a pier and for the construction of a wave wall, respectively. With continuous efforts of the project team and the relevant government departments and industry partners, wider applications of the new type of structures in Hong Kong and beyond can be expected. The research outcomes of this project constitute a major technological breakthrough in marine infrastructure which is of great importance to Hong Kong as a coastal city. With their many advantages, FRP-SSC structures will revolutionise the construction of marine infrastructure. The research outcomes of this project will also provide a strong basis for Hong Kong to export the related technologies in sustainable marine infrastructure to mainland China and beyond. 研究影響 作為示範項目，項目團隊已成功建造了用於香港污水處理廠道 路的 FRP-SSC 路面板，以及位於中國大陸的一個 FRP-SSC 結 構。FRP-SSC 結構也正在被用於香港的另外兩個示範項目，包 括一個碼頭重建項目和一個擋浪牆項目。在項目團隊和相關政 府部門及業界夥伴的不斷努力下，這種新型結構有望在香港和 其他地區得到更廣泛的應用。 本項目的研究成果是海洋基礎設施領域的重大技術突破，對香 港這個沿海城市具有重要的意義。FRP-SSC 結構具有很多優 點，將徹底改變海洋基礎設施的建造方式。這個項目的研究成 果，亦會為香港向中國內地和其他地區輸出可持續海洋基建相 關技術，奠定穩固的基礎。 Abstract Coastal cities like Hong Kong rely heavily on their coastal and marine (referred to as “marine” hereafter for brevity) infrastructure for social-economic development. There are two major challenges for marine infrastructure. One is steel corrosion, which is the main cause for infrastructure deterioration. Another is the shortage of fresh water and river sand for making concrete. This project aims to address both challenges by developing a new type of concrete structures to achieve sustainable marine infrastructure: seawater sea-sand concrete (SSC) structures reinforced with fibre-reinforced polymer (FRP) composites (referred to as FRP-SSC structures). As FRP composites have excellent corrosion resistance, they are gaining increasing acceptance as replacement of steel in conventional reinforced concrete structures in aggressive environments. By capitalising on the durability of FRP composites, seawater and sea-sand can be directly used in constructing marine infrastructure. The project team has developed mix proportions for SSC of different grades, various innovative forms of FRP-SSC structural members and connections, as well as various sensing technologies for long-term monitoring of FRP-SSC structures. Furthermore, the project team has developed a performance simulation platform for the long-term performance of FRP-SSC structures. 項目簡介 香港和其他沿海城市的社會經濟發展高度依賴其海岸及海洋基 礎設施（統稱為海洋基礎設施）。海洋基礎設施面臨的主要挑 戰有兩個。一是鋼材銹蝕，這亦是工程結構劣化的主要原因。 另一個是混凝土原材料淡水及河砂資源的短缺。為解決上述兩 項挑戰，本項目旨在研發一種新型混凝土結構以實現可持續海 洋基礎設施的目標。該種新型混凝土結構是由纖維增強樹脂基 複合材料（ FRP）與海水海砂混凝土（SSC）組合而成的複合 材料 - 海水海砂混凝土結構（簡稱為 FRP-SSC 結構）。由於 FRP 優越的耐腐蝕性，採用 FRP 替代侵蝕環境下傳統鋼筋混凝 土結構 中的鋼材，在實際工程中得到了日漸廣泛的應用。一旦 採用了 FRP 作為增強材料，海水、海砂將可直接用於建造海洋 工程混凝土結構。項目團隊研發了不同等級 SSC 的配合比、各 種創新形式的 FRP-SSC 結構構件和連接，以及用於 FRP-SSC 結構長期健康監測的各種傳感技術。此外，項目團隊還為 FRP-SSC 結構的長期服役開發了一個性能模擬平臺。 Test on FRP-SSC Beam-Column Connection FRP-SSC梁柱節點試驗 Exposure Tests at the West Artificial Island of Hong Kong-Zhuhai-Macau Bridge 港珠澳大橋西人工島海洋暴露試驗 15 Full-Scale FRP-SSC Frame Constructed at Guishan Island, Zhuhai 建於珠海桂山島的足尺寸FRP-SSC框架 Mock-up frame (without slabs) Seawater sea-sand concrete FRP-coated steel rebars Hybrid bars Hybrid bars Wavy-shaped FRP tubes FRP-coated steel rebars Final status Transportation
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