Basic Electronics for diploma students as per technical education Kerala Syll...
Test on fresh concrete and harden concrete
1. TEST ON FRESH CONCRETE
AND HARDENED CONCRETE
PRESENT BY:
MOHAMMED JIRUWALA
ALI LOKHANDWALA
JAYDEEP MAKWANA
CSPIT CIVIL DEPARTMENT
CHAROTAR UNIVERSITY OF SCIENCE AND
TECHNOLOGY
2. TEST ON FRESH CONCRETE
• What actually is a fresh Concrete?
• It is a phase of concrete from mixing to curing-
• Mixing
• Transporting
• Placing
• Compacting
• Layering(Finishing)
• Curing
• Also referred as- Green concrete, Workable concrete, Plastic
concrete.
6. COMPACTION FACTOR TEST
Observation
• Mixed proportion-1:2:3
• Weight of cement-2.68kg
• Weight of coarse aggregate-8.34kg
• Weight of fine aggregate-5.33kg
Procedure
• Preparation of concrete--pouring it into the compactometer
apparatus—opening couple of lids guiding the concrete to
cylinder—take that weight of uncompacted concrete cylinder
weight—take weight of compacted concrete cylinder weight—
take the ratio—analyze the results.
13. • Slump deforms in three possibilities(on the basis of height
from apex and shape)
o True slump- 0 to 175 mm from top
o Shear slump
o Collapsible slump
14. Other tests done on Fresh Concrete
Vee-Bee test
(IS: 1199-1959)
• It is based on the
measurement of the time to
transfer the concrete mix
from a frustum of the cone to
the cylinder .
• More the VEBE time , less
the workability of the mix . It
is very useful method for the
stiff mixes
15. Flow table test
(IS:1199-1959)
• For determination of consistency
of concrete where the nominal
maximum size of aggregate does
not exceed 38 mm using flow
table apparatus.
18. TYPES OF TESTS ON HARDENED
CONCRETE
1. DESTRUCTIVE TESTS
1. Compressive strength test
2. Split-tension test
3. Flexural strength test
19. TYPES OF TESTS ON HARDENED
CONCRETE
1.NON DESTRUCTIVE TESTS
1. Modulus of Elasticity
2. Rebound hammer test
3. Penetration resistance test
4. Ultrasonic pulse velocity test
20. ULTRASONIC PULSE VELOCITY TEST
• IS 13311(PART -1)-1992
• An ultrasonic pulse velocity (UPV) test is an in-situ, nondestructive test to
check the quality of concrete and natural rocks. In this test, the strength and
quality of concrete or rock is assessed by measuring the velocity of an
ultrasonic pulse passing through a concrete structure or natural rock
formation.
21.
22.
23. Method of calculation of pulse velocity :
Velocity = (Distance travelled / Path length)
Time taken
Pulse Velocity in concrete will be
in Km/sec.
represented
24.
25.
26.
27. REBOUND HAMMER TEST
•IS 13311 -2 (1992)
•It is a quick method for assessing the quality of
concrete based on surface hardness indicated the by
Rebound number.
•An higer rebound values indicate higher hardness of
the concrete .
30. COMPRESSION TEST
Apparatus- Compression machine(UTM)
• We can get the idea about compressive
strength of the concrete block
Standard Dimension of mould-
15x15x15cm3
Procedure
• Casting the blocks—Unmoulding—
curing-- placing in compression
machine—Take the load reading—
analyze the results.
31.
32. OUTCOME
• For any sample of concrete whose compressive strength is to
be tested, 3 or more cubes are casted and the values are
analyzed.
• Stress=failure load/Cross sectional area
• here, the load at failure turns out to be 434kN corresponding to
the cross sectional area of 225cm2.
• The Mpa value of this block as per the experiment is
19.39Mpa which is less than the desired value.
33. NDT1_Smart sensors
• In this testing process, the
sensor chips are used to
manipulate the properties of the
hardened concrete.
• Properties mentioned below can
be analyzed and displayed in
tabular or graphical manner.
» Compressive strength and its
graph with time
» Brittleness
» Interior temperature
» Internal cracks
» Void content
» Expansion and contraction of
specimen with time.
