CONTROL OF FLEXURAL CRACKS IN A SIMPLY SUPPORTED
BEAM BY EPOXY INJECTION TECHNIQUE
35th Our World in Concrete and Structures (OWICs) - 2010
Saeed Ahmad*, University of Engineering and Technology Taxila, Pakistan
Ayub Elahi, University of Engineering and Technology Taxila, Pakistan
M Yaqoob Farooqi, University of Engineering and Technology Taxila, Pakistan
Cracks, epoxy injection, repair procedure
Cracks in a reinforced concrete member will always be a threat for the adequate
performance and serviceability of the structure. The cracking in concrete can occur at
any time from the casting of time to the years after the concrete has been set in place.
Once the cracks have been developed in the concrete structure, it must be analyzed in
order to determine whether they require repairing or structure has to be demolished.
Cracks in concrete structures can indicate major structural problems and detract
from the aesthetic view of construction. There are many specific causes of cracking
which are responsible for the structural or architectural damages of construction.
However if the crack width is within the permissible limits it can be modified by
retrofitting techniques to safe the structural and architectural aspects of construction.
This work presented an experimental programme aimed to develop a latest
retrofitting technique that is utilized to re-strengthen the existing cracked reinforced
concrete member. The proposed technique consists of injection of epoxy resin
adhesive in a flexural cracked beam to increase its stiffness and flexural strength.
A total of six full scale reinforced concrete beams were constructed with the
same material by keeping same mix and water cement ratio. All the six beams were
tested till getting cracks having limiting value of 1mm and then repaired with epoxy
injection technique. After proper curing of three days these beams were tested again
and loaded till failure. An increase of load carrying capacity and deflection reduction for
control beam and repaired beam till reaching the crack width of 1mm was observed due
to injection of epoxy. This work clearly demonstrates the effectiveness of the proposed
technique in repairing the reinforced concrete member for strengthening existing