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Water-cement Ratio Versus Strength

其他書名	Another Look
出版	Iowa Engineering Experiment Station, Iowa State University, 1962
URL	http://books.google.com.hk/books?id=_FzzlBMyU0MC&hl=&source=gbs_api

註釋"The water-cement ratio (W/C) pronouncement probably marked the most useful and significant advance in the history of concrete technology. From the beginning, however, there have been dissenters who in their tests or research have happened to touch areas of usual gradings or areas that entailed comparisons between mortar and concrete or between neat cement, pastes, and sand-cement mortars. Beside the actual dissenters there have been thoughtful operators in the area of large-aggregate concrete, used regularly in dams, who recognizing the lack of information on possible effects of large aggregates and'/or large specimens on strength have serious doubts as to whether or not the mass concrete in the structure would develop the strength that the W/C relationship has allocated to it. With current attention being redirected toward possible limitations in scattered pertinent evidence that has, bit-by-bit over the years been presented, and forthwith became buried in voluminous literature of concrete. The aim is not to discredit the water-cement ratio as a useful empiricism but rather to focus attention on both its range of applicability and on its limitations. The paper calls attention to, and discusses briefly, a number of the published allegations of invalidity, indicating some of the pros and cons brought out in discussions thereof. As support for tentative explanations, pertinent stress-strain and water-gain data are presented. Finally a modified duly restricted and qualified version of a W/C versus strength relationship is proposed."--Page 3.