ASTM C469/C469M-14 pdf free download.Standard Test Method for Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compression.
1.1 This test method covers determination of (l) chord modulus of elasticity (Young’s) and (2) Poisson’s ratio of molded concrete cylinders and diamond-drilled concrete cores when under longitudinal compressive stress. Chord modulus of elasticity and Poisson’s ratio are defined in Terminology E6.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1 .3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the application of regulatory limitations prior to use.
2. Referenced I)ocuments
2.1 ASTM Staiulards.
C31/C3IM Practice for Making and Curing Concrete Test Specimens in the Field
C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C174/C 174M Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete Cores
Cl92/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
C617 Practice for Capping Cylindrical Concrete Specimens E4 Practices for Force Verification of Testing Machines
3. Significance and Use
3.1 This test method provides a stress to strain ratio value and a ratio of lateral to longitudinal strain for hardened concrete at whatever age and curing conditions may be designated.
3.2 The modulus of elasticity and Poisson’s ratio values. applicable within the customary working stress range (0 to 40 % of ultimate concrete strength), are used in sizing of reinforced and nonreinforced structural members, establishing the quantity of reinforcement, and computing stress for observed strains.
3.3 The modulus of elasticity values obtained will usually he less than moduli derived under rapid load application (dynamic or seismic rates, for example). and will usually he greater than values tinder slow load application or extended load duration, given other test conditions being the same.
4. Apparatus
4.1 Testing Machine—Use a testing machine capable of imposing a load at the rate and of the magnitude prescribed in
6.4. The machine shall conform to the requirements of Practices E4 (Constant-Rate of-Traverse CRT-Type Testing Machines section). The spherical head and bearing blocks shall conform to the Apparatus Section of Test Method C39/C39M.
4.2 Com,ressoineier —For determining the modulus of elasticity use a bonded (Note 1) or unhonded sensing device that measures to the nearest 5 millionths the average deformation of two diametrically opposite gauge lines, each parallel to the axis, and each centered about midheight of the specimen.ASTM C469/C469M pdf download.