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Bond Characteristics of Self-consolidating Concrete for Prestressed Bridge Girders

机译：预应力桥梁大梁自固结混凝土的粘结特性

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摘要

This paper presents the results of an extensive experimental program conducted to determine the material and bond characteristics of a proposed self-consolidating concrete (SCC) mixture for bridge girders. Fifteen full-scale, pretensioned SCC specimens were tested to evaluate the transfer and development lengths of their strand. These specimens included both single-strand and multiple-strand beams, as well as specimens designed to evaluate the so-called "top-strand" effect.rnThe top-strand-effect specimens, each with more than 20 in. (500 mm) of concrete below the strand, were tested to evaluate the current American Association of State Highway and Transportation Officials' (AASHTO) requirement. AASHTO requires a 30% increase in the strand development length when there is more than 12 in. (300 mm) of concrete below the strand. Before placing SCC in the beams, the prestressing strand was pre-qualified using the large block pullout test. Strand end-slip measurements, which were used to estimate transfer lengths, indicated that the proposed SCC allows strand to meet the American Concrete Institute and AASHTO transfer-length requirements. In addition, flexural tests on the same specimens confirmed that the SCC also meets the current code requirements for development length. Furthermore, the test results indicated that a 30% increase in development length was not necessary to achieve the full tensile capacity of the strand in the top-strand-effect specimens.
机译：本文介绍了一个广泛的实验程序的结果，该程序用于确定拟议的桥梁梁自固结混凝土（SCC）混合物的材料和粘结特性。测试了15个完整的，预张紧的SCC标本，以评估其链的转移和发育长度。这些样本包括单链和多链光束，以及旨在评估所谓的“顶链”效应的样本。rn顶链效应样本，每个样本的长度都超过20英寸（500毫米）。绞线下的混凝土被测试以评估当前的美国国家公路和运输官员协会（AASHTO）的要求。当线材下方的混凝土超过12英寸（300毫米）时，AASHTO要求线材开发长度增加30％。在将SCC放置在梁中之前，使用大块拉拔试验对预应力钢绞线进行了预鉴定。钢绞线末端滑移测量（用于估算传输长度）表明，建议的SCC允许钢绞线满足美国混凝土协会和AASHTO的传输长度要求。此外，对相同样品进行的弯曲试验证实，SCC也符合当前的显影长度规范要求。此外，测试结果表明，在顶部链效应样品中，为了达到链的全部拉伸能力，不必将显影长度增加30％。

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