Mechanical Properties and Durability of Ultra-High Performance Concrete Incorporating Coarse Aggregate

收缩率 材料科学 抗压强度 耐久性 剥落 复合材料 下跌 骨料(复合) 抗弯强度 极限抗拉强度 脆性 胶凝的 水泥
作者
Juan Yang,Gai Fei Peng,Yu Gao,Hui Zhang
出处
期刊:Key Engineering Materials 卷期号:629-630: 96-103 被引量:16
标识
DOI:10.4028/www.scientific.net/kem.629-630.96
摘要

Ultra-high performance concrete (UHPC) incorporating coarse aggregate was prepared with common raw materials. Fresh concrete had excellent good workability with slump of 265 mm and slump spread of 673 mm. Compressive strength of UHPC at 56 d reached 150 MPa. However, UHPC exhibited high brittleness in terms of spalling failure which occurred during compression loading.The ratio of splitting tensile strength to compressive strength of about 1/18 and the ratio of flexural strength to compressive strength of about 1/14 at 56 d were also associated with the brittleness of UHPC in this research. Mineral admixtures and fluidity of fresh concrete influenced compressive strength of UHPC significantly. Moreover, UHPC had excellent permeation-related durability but considerable shrinkage. Autogenous shrinkage of UHPC was less than half of free shrinkage, for which the reason is unknown and needs further research.
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