土木工程外文資料翻譯--混凝土與鋼筋混凝土的特性-建筑結(jié)構(gòu)(編輯修改稿)
2025-02-24 08:31 本頁面
【文章內(nèi)容簡介】 Under load , reinforced — 3 — concrete beams actually have numerous minute cracks which run at right angles to the direction of major tensile stresses. The tensile forces at such locations are being taken pletely by the steel “ rebars.” The pressive strength of a given concrete is a function of the quality and proportions of its constituents and the manner in which the fresh concrete is cured. (Curing is the process of hardening during which time the concrete must be prevented form “ drying out” ,as the presence of water is necessary for the chemical action to progress.) Coarse aggregate that is hard and well graded is particularly essential for quality concrete .The most important factor governing the strength , however ,is the percentage of water used in the mix .A minimum amount of water is needed for proper hydration of water used in the mix .A minimum amount of water is needed for proper hydration of the cement .Additional water is needed for handling and placing the concrete ,but excess amounts cause the strength to drop markedly . These and other topics are fully covered in the booklet, “ Design and Control of Concrete Mixtures, ” published by the Portland Cement Association. This is an excellent reference ,treating both concrete mix design and proper construction practices. The American Concrete Institute publish
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