應用高韌性纖維混凝土（ECC）邁向永續基礎設施工程

TOWARD SUSTAINABLE AND RESILIENT INFRASTRUCTURE ENGINEERING USING ECC

袁宇秉(Terry YP Yuen) ； 洪崇展(Chung-Chan Hung) ； Victor C Li

《中國土木水利工程學刊》 32卷8期 (2020/12) Pp. 713-720

https://doi.org/10.6652/JoCICHE.202012_32(8).0005

摘要

高韌性纖維混凝土（Engineered Cementitious Composites，簡稱ECC）的極限受拉應變可達2%至8%，數百倍於一般混凝土。ECC受力開裂時，裂縫的散佈均勻，在達到極限應變以前，其寬度不會持續擴大，而維持小於100 μm的穩定值。當ECC用於結構系統，其優異的受拉性能與高破壞容損性可克服一般混凝土的缺點，因而：一、抑制混凝土與鋼筋界面剝離；二、增加塑性鉸長度；三、減少剪力筋的使用量；四、避免大寬度裂縫的形成。本論文先嚴謹且完整回顧ECC的微觀力學基礎、材料定制方法和施工；之後說明ECC的耐震能力和耐久性，並介紹真實建築與基礎建設成功應用ECC的案例；最後討論典型ECC的限制，並介紹數種新型多功能ECC。

關鍵字

韌性纖維混凝土 ； 彎曲混凝土 ； 微觀力學設計 ； 永續與恢復能力

並列摘要

Engineered Cementitious Composites (ECC), commonly known as bendable concrete, is micromechanically designed for a tailored tensile strain-hardening behavior with strain capacity typically beyond 2% to as much as 8% which is a few hundred times greater than that of normal concrete and is comparable with the yield strain of reinforcing bars. Contrary to the localized cracking in normal concrete, ECC demonstrates well diffused cracking in tension with a stabilized crack width of less than 100 μm, which is on the same order of the diameter of a human hair, until the tensile strain capacity is reached. When used in structures, the superior tensile deformation capacity and damage tolerance of ECC can overcome the typical weaknesses of normal concrete by (i) suppressing interfacial debonding with reinforcement and the spalling of concrete cover, (ii) extending the plastic hinge length and enhancing the ductility, (iii) reducing the required amount of shear reinforcement, and (iv) preventing the formation of cracks with large width which are detrimental to the durability and structural resiliency. This paper critically reviews the micromechanics design basis of ECC (Section 2), the material tailoring methods, casting, and quality control (Section 3), seismic performances and durability (Section 4), and the successful applications of ECC in building and infrastructure projects (Section 5). Lastly, Section 6 discusses the current limitations of regular ECC and introduces the latest developments of several multi-functional and novel ECCs.

並列關鍵字

ECC ； bendable concrete ； micromechanics ； sustainability ； resiliency