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<br />{C <br />00 <br />In <br />C'J <br /> <br />c <br /> <br />CONTENTS <br /> <br />DURABILITY TESTS <br /> <br />~"tiOll <br />286 purpose of durability tests <br />287 Specimens and containers <br />288 Freezing cabinet <br />289 Thawing tank <br />290 Drying oven <br />291 Apparatus for measuring expansion <br />292 Apparatus for ehsticity measurements <br />293 Apparatus for measuring loss in weight <br />294 Fabrication of specimens <br />295 Preparation of specimens <br />296 The durability cycle <br />297 Control of brine temperature <br />298 Freezing Period <br />299 Thawing period <br />300 Drying period <br />} 0 1 Soaking period <br />3D2 Average temperature of specimens during durability cycle. . <br /> <br />VOLUME CHANGE OF CONCRETE BARS <br /> <br />3D} Fabrication, curing, and heat treatment of specimens <br />304 Apparatus for measuring changes in length <br />305 Measurement of changes in length of specimens <br /> <br />PLASTIC FLOW TESTS <br /> <br />306 <br />307 <br />308 <br />309 <br />310 <br />311 <br />312 <br />Jl3 <br /> <br />General <br />Specimens <br />Copper jackets and fabrication methods <br />Gage points <br />Curing <br />Method of applying sustained load <br />Instrument for measuring changes <br />Checking of load on specimens at <br /> <br />in length <br />regular intervals <br /> <br />PHYSICAL PROPER TIES OF CEMENTS <br /> <br />3 14 Test performed <br /> <br />FLEXURE TESTS OF PLAIN CONCRETE <br /> <br />315 Development of apparatus for flexure tests <br />316 Procedure for flexure test <br />317 Flexure formulas <br />318 Compressive strength of portions of beams <br /> <br />CHAPTER VIII-TEST RESULTS, lNVESTlGATIONS <br />AT DENVER <br /> <br />PHYSICAL PROPERTIES <br /> <br />H9 General <br />320 Time of initial and final set <br />321 Specific gravity <br /> <br />XVll <br /> <br />P"gt <br />297 <br />297 <br />300 <br />300 <br />300 <br />300 <br />304 <br />304 <br />304 <br />304 <br />30' <br />30S <br />30S <br />30S <br />30S <br />306 <br />307 <br /> <br />307 <br />309 <br />310 <br /> <br />310 <br />310 <br />311 <br />311 <br />311 <br />3IJ <br />313 <br />313 <br /> <br />3IJ <br /> <br />314 <br />314 <br />317 <br />319 <br /> <br />321 <br />322 <br />322 <br />