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<br />0': <br />00 <br />if'j <br />C',\ <br /> <br />c <br /> <br />xx <br /> <br />CONTENTS <br /> <br />Ser;/lon <br />396 Effect of Water-cement ratio <br />397 Hoover Dam cement acceptance tests for strength~heat ratio <br />398 Summary <br /> <br />ELASTIC PROPER TIES <br /> <br />399 <br />400 <br />.01 <br />402 <br />403 <br />.04 <br />'0' <br />406 <br /> <br />Purpose and scope of tests <br />Comparison of individual cements <br />Comparison of elastic modulus for various groups of cements <br />Effect of initial temperature of mass curing on elastic modulus <br />Effect of water-cement ratio on elastic modulus <br />Comparison of compressive strength with elastic modulus. <br />Poisson's ratio <br />Summary <br /> <br />DURABILITY <br /> <br />407 <br />408 <br />409 <br />410 <br />411 <br />.12 <br />413 <br />414 <br />41' <br />416 <br /> <br />Purpose and scope of tests <br />Standard and low.heat cement concretes <br />Laboratory cements of various compositions <br />Uniformity of results <br />Relation between absorption and durability <br />Comparison of the average durability of various cements and blends <br />Expansion due to wetting and contraction due to drying. . <br />Correlation of data <br />Visual observation <br />Summary <br /> <br />VOLUME CHANGE <br /> <br />417 Purpose and scope of tests <br />418 Thermal coefficient of expansion <br />419 Volume change during early ages <br />420 Effects of storage conditions <br />421 Summary of volume-change tests on concrete <br /> <br />PLASTIC FLOW <br /> <br />422 <br />423 <br />424 <br />421 <br />426 <br />427 <br />428 <br />429 <br /> <br />Nature of plastic flow <br />Purpose and scope of plastic flow tests <br />Typical time-flow curves for a labotatory modified cement and a low-heat cement <br />Plastic flow at 18 months for various cements <br />Effects of unit loading, initial temperature of mass curing, and age <br />Effect of sustained loading on compressive strength and modulus of elasticity <br />Effects, after sustained loading, of initial temperature and age at loading <br />Summary ......... <br /> <br />FLEXURE TESTS <br /> <br />430 <br />411 <br />432 <br />433 <br />434 <br />435 <br />436 <br /> <br />General <br />Relation of moduli of rupture and elasticity to compressive <br />Effect of fineness of cement on flexural properties <br />Effect of initial temperature <br />Effect of compound composition on flexural properties <br />Modulus of elasticity in flexure <br />Effect of stor~ conditions <br /> <br />strength <br /> <br />J91 <br />J93 <br />393 <br />394 <br />3" <br />396 <br />399 <br />400 <br />401 <br />401 <br /> <br />402 <br />402 <br />404 <br />404 <br />40f <br /> <br />406 <br />406 <br />407 <br />414 <br />414 <br />4Ii <br />417 <br />418 <br /> <br />419 <br />422 <br />424 <br />421 <br />421 <br />421 <br />.,6 <br /> <br />1 <br /> <br />Pagt <br />379 <br />380 <br />J80 <br /> <br />JS2 <br />382 <br />3" <br />386 <br />388 <br />389 <br />390 <br />390 <br />