Repair And Protection Of Concrete Structures

Repair and Protection of Concrete  Structure AST Engineers Pvt. Limited provides and carries out solutions for water ingress problems into and from any masonry & Concrete structure. These can include Joints (cracks, day or construction joints, movement joints) Continuous internal waterproof linning and injection grouting system (such as basement) Active leak sealing (accelerated additives or mortars) to porous or honeycombed areas, joints or holes. Pipes or protrusions through the structure to combat both positive and negative water pressure. Injection of flexible, open and closed cell Polymer Resins into joints, cracks or honeycombed areas under pressure using specialised high pressure grouting single or multi component by pumps. Concrete repair can become necessary due to a number of factors affecting a structure. Atmospheric conditions, the quality and type of original construction, the degree of maintenance carried out or previously applied repair systems can all play a large part in the degradation of the concrete elements within a structure.  Concrete spalling can be caused by: Carbonation Chloride and other contamination Alkali silica reaction (ASR) Corroded reinforcement Low reinforcement cover Poor construction techniques Shrinkage and stress cracking Honeycombed concreteStructural design defects Once any of the above problems have occurred, external conditions can quickly exacerbate the condition especially during the rainy seasons. The symptoms of these problems can manifest themselves in similar ways. Extensive on-site test surveys backed up by laboratory testing can be carried out where required by AST Engineers Pvt. Ltd. to determine the cause and extent of these symptoms as advised by the Consultants. The client can then be provided with a detailed and effective solution which is long lasting and aesthetically pleasing .  Investigations 1.      Non- Destructive testing 2.      Full scale load test 3.      Visual and Rebound hammer test 4.      Ultra pulse velocity test 5.      Semi destructive test core testing Repair Methods Selection of the appropriate manufacturer and system to comply with the works specification is carried out in advance by our Consultants and agreed by the client. Concrete Repair Break out the defective areas using breakers suited to the size and location of the repairs. Thoroughly clean all reinforcement by mechanical means (needle gun, grit blasting or similar methods). Prime steel and adjacent concrete using the appropriate primers for the system employed. Whilst the primer is still tacky, apply in layers if necessary the concrete repair mortar (resin or cementitious) by hand and finish using a steel trowel to the original profile. Guniting can be adopted where feasible Cracking in Concrete Cracks can be caused by stresses in the structure from loading or foundation movements or shrinkage, expansion and other site or design problems.