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【正文】 ue to previous findings that have concluded that RCAconcrete is inherently inferior to conventional concrete made with natural In the past, mixture proportioning methods for conventional concrete have been applied with minor modifications to design RCAconcrete mixtures. A principal modification has been the increase in the cement content, with no special consideration given to the residual mortar volume fraction of Although by suitable adjustment of the cement content and watercement ratio (w/c) of mixtures involving RCA, concrete with higher pressive strength than the concrete from which the RCA originated has been produced,3 such adjustments have not resulted in parable RCAconcrete possessing superior elastic modulus, bond strength, or stressstrain characteristics to similar grade conventional ,4 Consequently, it has been reported that structural 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。 cracking, yielding, and ultimate moments。但假設(shè)這個(gè)說(shuō)法是合理的，那么用RCA方法制成的混凝土構(gòu)件不會(huì)產(chǎn)生較大的偏轉(zhuǎn)以及較低的極限抗壓強(qiáng)度，這與完全用天然骨料制成的常規(guī)鋼筋混凝土構(gòu)件具有類似的性質(zhì)。主要修改就是增加了水泥量，但沒(méi)有考慮RCA混凝土的剩余灰漿體積分?jǐn)?shù)。英文翻譯1外文原文出處：ACI Structural Journal。在過(guò)去，混合物配制新方法在常規(guī)混凝土原料上所做的修改，就是用來(lái)設(shè)計(jì)RCA混凝土混合物的。由于用EMV方法配制成的RCA混凝土不會(huì)出現(xiàn)像用常規(guī)方法配制的RCA混凝土本質(zhì)低劣這個(gè)問(wèn)題。 therefore, when proportioning the mixture, the relative amount and properties of each phase are considered separately. Several reinforced concrete beams are built an
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