bmc presentation

2. GROUP NO 4:
SIDRA IDREES 17
AHMAD NAWAZ 16
MAHEEN DAUD 18
ABTAL AHMAD 19
FASEEHA KHALID 20

3. DETERMINATION OF
ELASTIC MODULUS OF
CONCRETE
STANDARDS:
 ASTM C469
 ACI 318-14.

4. Determination of Elastic Modulus of
Concrete
 Modulus of elasticity of concrete is the ratio
of normal stress to the corresponding strain
for tensile or compressive stresses below the
proportional limit of concrete, ACI 318-14.

5. ASTM C469 Test
Method
Apparatus
 Testing
Machine

6. ASTM C469 Test Method
 Compressometer
Attached to
Concrete
Specimen

7. TEST SPECIMEN
 Moulded Cylindrical Specimen should be
tested within an hour after its removal from
curing or storage room.
 Modulus of elasticity can also be determined
using a drilled core specimen. Requirements
pertaining to storage and ambient conditions
immediately prior to the test shall be the
same as for moulded cylindrical specimens.

8. Test Procedure
 Keep the ambient temperature as steady as
possible throughout the test.
 Use two specimens to specify the
compressive strength prior to the modulus of
elasticity test.
 Attach the strain-measuring equipment to
the specimen.
 Place the specimen on the lower platen or
bearing block of the testing machine.

9. Test Procedure
 Align the axis of the specimen with the center
of thrust of the spherically-seated upper
bearing block.
 Load the specimen carefully to seat the
gauge and observe its performance. Any
abnormal response shall be corrected.
 After that, apply the load continuously; record
the applied load and longitudinal strain when
the longitudinal strain is 50 millionth, and the
applied load is 40% of the ultimate load.

10. Calculation of Modulus of
Elasticity
 We calculate elasticity modulus of concrete
using the following equation:
 S2: stress corresponding to 40% of ultimate
load.
 S1: stress corresponding to a longitudinal
strain of 50 millionths, psi
 e2: longitudinal strain produced by stress S2.

11. RESULTS
 The modulus of elasticity of concrete is
computed to the nearest of 50000 psi
(344.74 MPa) .