Creep-low-modulus-study

Creep-low-modulus-study - MODULUSOFELASTICITY,CREEPAND...

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1 MODULUS OF ELASTICITY, CREEP AND SHRINKAGE OF CONCRETE–PHASE II U.F. Project No. 00059678 Contract No: BD545 67 FDOT Project Manager: Michael Bergin August 2009 Department of Civil & Coastal Engineering College of Engineering University of Florida Gainesville, Florida 32611 6580 Acknowledgments Invaluable Support from the following FDOT personnel: Charles Ishee Richard DeLorenzo Craig Roberts Joseph Fitzgerald Christopher Ferraro Toby Dillow Luke Goolsby & Others
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2 Acknowledgments Florida Rock Industries Company for donating the ground blast furnace slag Boral Materials Company for donating the fly ash W. R. Grace and Company for donating the chemical admixtures Carolina Stalite Company for donating the lightweight aggregate MODULUS OF ELASTICITY, CREEP AND SHRINKAGE OF CONCRETE–PHASE II, PART 1 – CREEP STUDY Mang Tia Yanjun Liu Boris Haranki Yu Min Su
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3 Background and Research Needs for Creep Study (1/2) •Th e values of the modulus of elasticity, ultimate shrinkage strain, and ultimate creep coefficient of concrete, which are used in structural design in Florida, are either based on the arbitrary available literature or on the limited research of the locally available material. Background and Research Needs for Creep Study (2/2) e r e is a great need for comprehensive testing and evaluation of locally available concrete mixes to determine these physical properties of Florida normal weight, as well as lightweight concretes, especially for the concretes used in pre stressed concrete structures, so that correct values for these properties can be used in structural design.
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4 Objectives of Creep Study (1/2) •To design and recommend an effective and reliable laboratory testing set up and procedure for performing creep tests on concrete. •To evaluate the effects of aggregate, mineral additives and water to cementitious materials ratio on strength, elastic modulus, shrinkage and creep behavior of concrete. Objectives of Creep Study (2/2) •To determine the strength, elastic modulus, shrinkage and creep behavior of the typical concretes used in Florida. •To determine the relationship among compressive strength, splitting tensile strength, and modulus of elasticity of concretes made with typical Florida aggregate. •To develop prediction equations or models for estimation of shrinkage and creep characteristics of typical Florida concretes.
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5 Creep Apparatus (1/4) –T h e creep apparatus was capable of applying and maintaining a load up to 145,000 lb on the test specimens with an error of less than 2%. h r e e specimens could be stacked for simultaneous loading. 1 1.25in 1.125in 1.5in 1in 36in 1in 8.25in 10in 18in 12in 18in Hydraulic Jack Load Cel Springs Concrete Cylinder Gauge Circular Steel Plate Circular Steel plate Gauge Point Position Guide 10 6.05” 12 0 o 120 o 12 0 o Creep Apparatus (2/4)
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6 Alignment Frame 12.0 0in 1.5i n 1.7 5in 2.00 in 12.00 5.00 in 0.1 9in 0.1 9in 0.5i n 0.5 in 3.00 8.0 4.0 0.5 in 10.0 0in Creep Apparatus (3/4) Position of Springs Large spring Small spring 6in 12in 12in 6in Outside 5.50in
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This note was uploaded on 05/26/2011 for the course CGN 3501 taught by Professor Mang during the Fall '10 term at University of Florida.

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Creep-low-modulus-study - MODULUSOFELASTICITY,CREEPAND...

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