High-Early-Strength Engineered Cementitious Composites for Fast, Durable Concrete Repair—Material Properties
High-Early-Strength Engineered Cementitious Composites for Fast, Durable Concrete Repair—Material Properties
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DOI：
10.14359/51664210
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发表时间：
2011
影响因子：
1.7
通讯作者：
Mo Li;V. Li
中科院分区：
文献类型：
--
作者：
Mo Li;V. Li
世界各地的混凝土结构缺乏耐久性，这就要求快速、耐用的维修。为了满足这一需求，高早期强度工程水泥复合材料(HES-ECC)最近被开发出来，用于希望将操作中断降至最低的混凝土修复应用。本文详细描述了HES-ECC在不同龄期的压缩、拉伸、弯曲和收缩性能。4小时抗压强度为23.59±1.4兆帕(3422.16±203.33磅/平方英寸)，28天为55.59±2.17兆帕(8062.90±315.03磅/平方英寸)。在单轴拉伸下，HES-ECC表现出拉伸应变硬化行为，应变容量大于2.5%。其抗折强度是抗压强度相近的混凝土的两倍以上。在约束收缩条件下，高强混凝土形成微裂缝，其自控裂缝宽度小于50μm(0.002英寸)。这些性能的结合表明，HES-ECC材料非常适合快速耐用的混凝土修复，缩短了停机时间，提高了长期耐久性。
The lack of durability in concrete structures worldwide demands fast and durable repairs. To address this need, high-early-strength engineered cementitious composites (HES-ECC) were recently developed for concrete repair applications in which minimum operations disruption is desired. A detailed characterization of HES-ECC’s compressive, tensile, flexural, and shrinkage properties at different ages is reported in this paper. HES-ECC achieves a compressive strength of 23.59 ± 1.40 MPa (3422.16 ± 203.33 psi) in 4 hours and 55.59 ± 2.17 MPa (8062.90 ± 315.03 psi) in 28 days. Under uniaxial tension, HES-ECC exhibits tensile strain-hardening behavior with a strain capacity greater than 2.5%. Its flexural strength exceeds twice that of concrete with similar compressive strength. Under restrained shrinkage conditions, HES-ECC forms microcracks with a self-controlled crack width below 50 μm (0.002 in.). The combination of these properties suggests HES-ECC material is highly suitable for fast and durable concrete repairs with shortened downtime and improved longterm durability.