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1. Strengthening Chemically deteriorated concrete structures
R.G. Limaye, M.K. Kamat, and S. Hotta
The structural integrity of
chemically-deteriorated reinforced concrete beams was restored by repairing one set of
beams by epoxide resin latex and another by polymer-based latex system. The paper reports
an experimental programme to this effect. It was interesting to observe an increase in the
load-carrying capacity and rigidity of the beams after repairs.
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2. Repairs of beams and Slab with excessive Deflection
B. V. Bhedasgaonkar and M. K. Wadekar
Excessive deflections
of slabs and beams were observed in an office building of a sugar factory in western
Maharashtra. The problems was analysed and it was found that the beams and slabs were
undersigned. The paper presents a detailed scheme of repairs that was carried out by the
authors.
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3. Recent advances in repair and rehabilitation of RCC structures with
non-metallic fibers
Abhijit Mukherjee and Mangesh Joshi
Cement concrete reinforced with steel bars
is an extremely popular construction material. One major flaw, namely its susceptibility
to environmental attack, can severely reduce the strength and life of these structures.
External reinforcements using steel plates have been used in earlier attempts to
rehabilitate these structures. The most important problem that limited their wider
application is corrosion. Recent developments in the field of fiber reinforced composites
(FRCs) have resulted in the development of highly efficient construction materials. The
(FRCs) are unaffected by electro-mechanical deterioration and can resist corrosive effects
of acids, alkalis, salts and similar aggregates under a wide range of temperatures. This
novel technique of rehabilitation is very effective and fast for earthquake affected
structures and retrofitting of structures against possible earthquakes.
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4. Assessment of Damage to framed RCC structures in Gujarat Earthquake
and Retrofitting with Fiber Wrapping technique
B. V. Bhedasgaonkar
After the earthquake a number of structures in Ahmedabad, Rajkot, Surendranagar were
inspected to see the effect of earthquake. It revealed that buildings done with good
structural system (though not necessarily designed to resist earthquake) have not been
damaged. Good structural system includes:-
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5. Experimental Studies on penetrating type corrosion inhibitor in
reinforced concrete
R.G. Limaye, R.D. Angal, A.S. Radke
The paper presents
experimental studies on a new generation of corrosion inhibitor, which is based on
bi-polar mechanism and which can penetrate even dense concrete by virtue of its vapour
pressure and affinity for the embedded steel in concrete. The inhibitor is used both as an
admixture in fresh concrete and as a coating on hardened concrete.
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6. Restoration of machine foundations with thermoset polymer grout.
Foundations of heavy machines in a large industrial unit in central Bombay were heavily
damaged, resulting into loss in quality of the casting produced from these machines. The
article briefly describes investigations carried out to determine the nature and degree of
damage. It also highlights the remedial measures and post - repair behavior of the
machines. It was observed that the quality of casting produced from the machine improved
immediately after the repairs and even after four years of the repairs, the condition of
the foundations is satisfactory.
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7. Repairs and Remedial Measures to Turbo Generator Foundation in Unit
V & VII / T S II
K. Govindaraj, K Chakkaravarth, B. Sivagnanam
Power is the most important need for our
day to day life of mankind and industries. Neyveli lignite corporation caters major power
requirement of our nation and 60% of the power requirements of Tamil Nadu. In Neyveli
Lignite Corporation Limited, second Thermal Power Station is a major Generation Plant
which consists of 7 Units of 210 MW having total generation capacity of 1470 MW.
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8. Rehabilitation of structurally damaged and corrosion affected
structures using polymer systems
M.K. Kamat, B.V. Bhedasgaonkar
The authors report three case studies of
structurally-damaged concrete structures where the extent of corrosion of reinforcement
was also high. In all the three cases, polymer-based materials were used for
rehabilitation.
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