土木工程外文翻譯(編輯修改稿)
2025-02-11 02:18 本頁面
【文章內(nèi)容簡介】 uctural members made from RCAconcrete experience larger deflection, exhibit wider cracks and smaller crack spacing, and have relatively lower flexural strength pared to the panion conventional concrete This kind of variability constitutes a drawback and discourages its use because it creates uncertainty with respect to the serviceability and longterm performance of RCAconcrete structures.To overe this problem, in a separate investigation,described in detail elsewhere, the authors developed a new mixture proportioning method for RCAconcrete called the equivalent mortar volume (EMV) In this method, RCA is treated as a twophase posite material prising residual mortar and original natural aggregate。 therefore, when proportioning a concrete with RCA, the volume fraction and relevant property of each phase is accounted for. Because an RCAconcrete mixture proportioned by the EMV method does not suffer from the inferiorities of RCAconcrete proportioned by conventional methods, it is reasonable to assume, contrary to previous findings, that reinforced concrete members made of RCAconcrete thus proportioned will not experience larger deflection and lower ultimate flexural strength pared to reinforced concrete members produced with similar grade conventional concrete made entirely with natural aggregates.To verify this assumption, an extensive experimental study was carried out by testing under flexure a number of reinforced RCAconcrete beams made with coarse RCA and panion control beams made of concrete containing only coarse natural aggregate with similar properties as the coarse natural aggregate in RCA. The investigated properties include deflection, crack spacing, cracking moment, yielding moment, ultimate flexural strength, cracking pattern, and failure modes. Two different sources of RCA, designated RCAM and RCAV, were used in the study and are obtained from recycled concrete processing plants in Montreal (M) and Vancouver (V), respectively. The natural aggregate in RCAM was n
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