Repair of Concrete Structures
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Contents:
Repairs of Hair Cracks by Grouting 4. Epoxy Concrete 5. Repairs of Floors 6. Repairs of Columns 7. Repairs of Corroded R. The damaged structural member may be strengthened by bonding externally steel plates with chemicals or by bonding carbon fibre sheets externally with chemicals.
Structural Concrete Repairs
Apart from epoxy injection, repairs of cracks and damaged concrete structures with exposed reinforcing steel are done by epoxy mortar and epoxy concrete,. Epoxy mortars are increasingly being used for patch repairs and strengthening against spalling and corroded concrete structures. Epoxy mortar has been successfully used for repairing concrete structures as well. The main requirements of mortar are almost identical, except a bond between old and new concrete is established with epoxy mortar. One kg of resin and half kg of hardener are mixed thoroughly in a plastic tray. Then 3 kg of quartz s and Mix 10 is mixed so as the mortar does not contain lumps of un-wetted sand and has uniform colour.
Viscosity of the epoxy mix increases sufficiently with the reduction in temperature. The hairline cracks developed in the roof are to be cut in V-groove shape of 6 mm width and are to be filled with epoxy putty. Epoxy mix has now to be forced by pneumatic gun at a pressure of 2 to 4 kg per sqcm. After grouting, the grout holes should be sealed with epoxy putty. Epoxy concrete is nowadays often used for repairing concrete members like roof, floor, columns, etc.
Table of Contents
The bond of the new concrete with the old surface is effective. The epoxy compound improves the quality of the concrete by increasing the tensile strength of the concrete and removing its general weaknesses.
If any one of these is absent, damage will not occur. The water in the dispersion is gradually absorbed into the concrete and by several applications the crack is filled with a water-resistant rubbery acrylic resin which can accommodate a small degree of movement. They contain resins which are percent solid. If some remedial treatment is considered to be necessary, however, the only practical course, short of demolition and rebuilding, is to apply some form of paint or surface coating which must be suitable for application to an alkaline surface. Experience has shown that thixotropic materials are also suitable for injecting cracks through concrete walls where the back face may not be accessible for face seals to be applied. Setting times are purely arbitrary states of stiffening that are determined by needle penetration tests on standard specimens of cement paste and defined in British Standard EN 2 ; they do not represent any sudden change in properties, and they refer to cement paste only, not to mortar or concrete. Hand-applied repairs usually consist of cement and sand mortar in proportions of about
In cases where due to decay of the concrete reinforcements have been exposed, the surface after scraping and cleaning and adding additional reinforcement, if necessary, may be repaired and restored by epoxy concrete. Epoxy concrete is prepared by addition of epoxy resin with hardener in proper proportion. A coat of epoxy compound on the surface prior to concreting increases the bonding of the new concrete with the old surface.
Concrete Repair
In actual operation a column was successfully repaired with epoxy concrete. The surface was chipped off 50 mm deep — exposing the reinforcement. A damaged floor was repaired by overlaying two coats of epoxy and then epoxies mortar and finally applying an epoxy coat. The damaged floor was washed clean with detergent and water.
Every penny spent on improving concrete quality, protection and enhancement pays off in the long term, reducing the need to demolish and rebuild structures that could otherwise be saved. The deterioration of concrete is influenced by a number of physical, chemical and environmental factors.
Failure, Distress and Repair of Concrete Structures. A volume in Woodhead Publishing Series in Civil and Structural Engineering. Book • Edited by. Concrete structures are no exception. As a result, new materials and methods of concrete repair have been developed, but much of this information has.
Our materials are also excellent for making good in new construction. When it comes to defects — from cosmetic to structural — Fosroc has the experience and the technology to get your project back on track. We pride ourselves on our customer service and knowledge, see how we have helped clients in the past.
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