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【正文】 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。reinforced concrete。 and the general flexural theory and current code provisions for flexural design are applicable, without alteration, to the reinforced recycled concrete beams.Keywords:flexural strength。 cracking patterns。 cracking, yielding, and ultimate moments。 Nov/Dec2009, Vol. 106 Issue 6, p858867, 10p, 2 Diagrams, 4 Charts, 6 GraphsA new method of mixture proportioning is used to investigate the flexural performance of reinforced concrete beams made with coarse recycled concrete aggregate (RCA). In this method, RCA is treated as a twophase material prising residual mortar and natural aggregate。RCAM混凝土中的天然骨料是天然石灰石，而在RCAV混凝土中所用的卻是天然的河床砂石。調(diào)查的幾個(gè)因素包括撓度，裂縫間距，開裂時(shí)刻，屈服時(shí)刻，最終的抗彎強(qiáng)度，開裂模式和失效模式。但假設(shè)這個(gè)說法是合理的，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)。在這個(gè)方法中，把RCA作為一種由剩余砂漿和天然骨料組成的兩階段復(fù)合材料；所以，按比例配制RCA混凝土?xí)r，每階段材料含量不同也對(duì)應(yīng)有不同的產(chǎn)物。這種變化的缺點(diǎn)妨礙了其使用功能，因?yàn)樗斐闪薘CA混凝土結(jié)構(gòu)在適用性和持續(xù)性使用功能中的不確定因素。盡管如此，這種調(diào)整并沒有使得RCA混凝土比常規(guī)混凝土擁有更優(yōu)越的彈性模量、粘結(jié)強(qiáng)度或應(yīng)力
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