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论文类型：期刊论文

发表时间：2017-11-05

发表刊物：MATERIALS & DESIGN

收录刊物：Scopus、SCIE、EI

卷号：133

页面范围：363-375

ISSN号：0264-1275

关键字：Size effect; Boundary effect model (BEM); Aggregate size; Tensile strength; Fracture toughness

摘要：Two hugely different mortar beams with the volume ratio close to 1: 1000 were tested under three-point-bending (3-p-b) to verify fracture predictions for the large and long (LL) structures from results of the small and short (SS) specimens. They differed by both size and geometry: SS specimens with span length S = 0.1 m, width W = 40 mm and S/W = 2.5, and LL beams with S = 2 m, W = 500 mm and S/W = 4. This study performed and analysed quasi-brittle fracture of 0.1 m SS specimens with initial notch a(0) from 1 to 25 mm for determination of tensile strength f(t\) and fracture toughness K-IC, from which fracture of 2 m LL beams with a(0) of 250 mm was accurately predicted. Experiment results from the two vastly different 3-p-b beams, highly heterogeneous SS and nearly homogeneous LL in comparison to aggregates, were analysed by the boundary effect model (BEM). (C) 2017 Elsevier Ltd. All rights reserved.