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论文类型：期刊论文

发表时间：2016-09-01

发表刊物：CONSTRUCTION AND BUILDING MATERIALS

收录刊物：SCIE、EI、Scopus

卷号：120

页面范围：293-308

ISSN号：0950-0618

关键字：Equivalent maturity; Ambient temperature; Dam concrete; Site-casting; Fracture energy; Effective fracture toughness

摘要：This paper presents the influence of ambient temperature on the fracture properties of site-casting (or cast in-situ in other words) dam concrete. By virtue of the mixing tower system in the site of a super high arch dam, the wedge splitting specimens with the maximum aggregate size of 150 mm were poured in summer and in winter seasons, respectively. The variations of fracture parameters obtained by experiment with different age were revealed, and the results show that the dam concretes poured in summer and in winter seasons show much difference in fracture characteristics at the age of 28 days, however, with the increase of age, the difference in fracture behavior decreased, and was almost zero at the age of 180 days. On top of that, by introducing the concept of equivalent maturity, the relationships between fracture parameters of site-casting dam concrete and equivalent maturity were obtained. (C) 2016 Elsevier Ltd. All rights reserved.