Basic Civil & Mechanical Engineering: UNIT II: k. Cement concrete
SLUMP TEST - Measurement of Workability of Concrete
Slump Test is also known as Test for Consistency of Concrete. The object of this test is to study the Workability of the concrete mix. Workability means the ease with which mixing, handling and placing of concrete can be done.
SLUMP TEST - Measurement of Workability of Concrete
Slump
Test is also known as Test for Consistency of Concrete. The object of this test
is to study the Workability of the concrete mix. Workability means the ease
with which mixing, handling and placing of concrete can be done. Depending on
the nature of work and site condition, the concrete mixture may be made either
stiff or wet. For uniform concrete work, the same consistency must be
maintained throughout.
Workability
is affected by the factors, viz., 1. Mix Proportions, 2. Aggregate Properties,
3. Time, 4. Environmental Conditions and 5. Adding Admixtures. [Admixtures are
additional fine materials like powdered earth, fly ash, hydrated lime, etc.,
used in concrete. Admixtures improve workability, reduce segregation and
accelerate setting and hardening of concrete.]
SLUMP
TEST
Slump
Test is conducted to measure the workability of concrete and to decide the
required quantity of water. Fig. 8(a) shows a Hollow Truncated Cone of sheet
metal with top and bottom open. Actually, the slump cone is a ‘mould' that can
be lifted vertically after filling with concrete. Height of the cone is H1
= 30 cm.
Samples
from ready-mixed concrete heaps are taken and poured into the cone. Filling the
slump cone with concrete is done in layers of thickness of 8 cm. After laying
each layer, it is compacted with 25 strokes using a rod. After filling the cone
with concrete, it is gently lifted and carefully removed.
See Fig. 8(b).
The concrete is allowed to subside. Now, Height of concrete (H2) is
measured. Slump of concrete is the decrease in the height of the highest point
of the slumped concrete. i.e., Slump = H = H1 - H2.
For
stiff consistency, subsidence will be less and for plastic consistency,
subsidence will be more. Normal consistency is denoted by a slump of 2.5 cm.
Addition of 10% water will give a slump of 10 cm and 25% water will give a
slump of 15 cm.
Basic Civil & Mechanical Engineering: UNIT II: k. Cement concrete : Tag: : - SLUMP TEST - Measurement of Workability of Concrete
Basic Civil & Mechanical Engineering: UNIT II: k. Cement concrete
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