field study of rcc structures

FIELD STUDY OF RCC
CONSTRUCTION PROJECT

SANJIB DAS (CIB11019)
MANJEET YADAV (CIB11040)

Introduction
INTRODUCTION
CONSTRUCTION OF RCC
STRUCTURE

IMPLEMENTATION OF
IS 13920:1993

FOUNDATION
It is the earth that provides the
ultimate supporting for the
structure.

TYPE OF FOUNDATION
 SHALLOW FOUNDATION
if Df/B ≤ 1

DEEP FOUNDATION
with Df/B greater than 1 but less than 15, are
moderately deep.

Deep foundations such as pile foundations
have Df/B ratio greater than 15.

SOIL TESTING
It is the scientific method to
determine the following properties:
Bearing capacity of soil test
Permeability test
Water absorption test
Core cutter
Bulking of sand

SPT (Standard Penetration Test)

The standard penetration test (SPT) is an in-situ
dynamic penetration test designed to provide
information on the geotechnical engineering
properties of soil.

PILING
It is a type of deep foundation distinguished
from shallow foundations by the depth they
are embedded into the ground.
It is necessary where the soil i.e, the base
of the construction site is poor where the
actual construction is to done. Otherwise
we can directly go for the footing of the
basement

SUPER STRUCTURE
 It is generally the portion of the building located
above ground, in contrast with the basement
and substructure underground.
Designing superstructures requires considering
the pressure and force they will exert on the
finished construction and balancing this to
address concerns about safety and stability.
The size of the superstructure is an important
factor in base design, as the base of the
structure must be able to support the entire
laden weight

REINFORCEMENT
Steel is used as the reinforcing material in concrete to
make it good in tension.
steel bars up to 12 mm in diameter are designated as
bars while bars more than 12 mm in diameter are
termed as rods.
The four types of steel used in concrete structures as
specified in cl. 5.6 of IS 456 are given below:
(i) Mild steel and medium tensile steel bars
conforming to IS 432 (Part 1)
(ii) High yield strength deformed (HYSD) steel bars
conforming to IS 1786
(iii) Hard-drawn steel wire fabric conforming to IS 1566
(iv) Structural steel conforming to Grade A of IS 2062.

IGNORANCE IN FIELD
IS 13920
FIELD SAMPLE RECOMENDATION

 Both end should be bent at
an angle of 135° but in this
sample only one end is at
135°

Lap joint is absent in
this sample which
violates IS code

The gap
between the
bars is less
than 25 mm
between the
middle
longitudinal
bar.

 Stirrup bent
is not done
nor welded

CONCRETE
 Concrete consists of a rationally chosen mixture of
binding material such as lime or cement, well graded
fine and coarse aggregates, water and admixtures (to
produce concrete with special properties).
The stages of concrete production are:
1. Batching or measurement of materials
2. Mixing
3. Transporting
4. Placing
5. Compacting
6. Curing
7. Finishing

COMPARISION
IN FIELD IS 456 RECOMENDATION

 Mixing time of concrete in  It should be atleast 2
tilt mixer was about 30- 40 minute
seconds  Separate weighing box
 Mix design ratio was should be used for
1:1.62:2.97. The weighing batching of sand and
box used to obtain this ratio gravels.
was same for sand and
gravels.

Hand made weighing box is used which
Disturb the desired mix ratio.

MORTAR AND BRICK WORK

Mortar is a workable paste used to bind
construction blocks together and fill the gaps
between them. The blocks may be stone,
brick, cinder blocks, etc.

Brick should be soak in water for 1.5- 2 hour before
using it with mortar. But in this project the bricks were
hardly soak in water for 10-20 minutes as a result brick
will absorb water from mortar reducing the bond strength
between mortar and bricks.

CONCLUSION

Due to lack of awareness of IS code
and time, IS Code is not always
followed

field study of rcc structures

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field study of rcc structures