TYPES OF CRACKS IN REINFORCED CONCRETE SLABS 1. Cracks in reinforced concrete columns due to Steel Corrosion (cracks parallel to steel bars) 2. Cracks in reinforced concrete columns due to shrinkage of concrete 3. Cracks in reinforced concrete columns due to increased load on the slab 4. Cracks in reinforced concrete columns due to sulphate(…)
Concrete Cracks
EVALUATION OF CRACKS IN CONCRETE
When anticipating repair of cracks in concrete, it is important to first identify the location and extent of cracking. It should be determined whether the observed cracks are indicative of current or future structural problems, taking into consideration the present and anticipated future loading conditions. The cause of the cracking should be established before repairs(…)
GROUTING PROCEDURE FOR CRACKS IN CONCRETE
Procedure for cement grouting of cracks in concrete structures: Holes are drilled in structure along cracks and in an around hollow spots. If there are several cracks, holes can be drilled in a staggered manner at 500 to 750mm spacing in both directions covering adequately the area proposed to be grouted. Holes spacing can be (…)
TEMPERATURE EFFECTS ON CONCRETE
THERMAL MOVEMENT IN CONCRETE As with any material, concrete will expand and contract as the temperature rises and falls. The size of movement depends upon the change in temperature and the coefficient of thermal expansion o f concrete. The coefficient of thermal expansion of concrete is influenced largely by the coefficient of thermal expansion of(…)
CEMENT GROUTING FOR CRACKS IN CONCRETE AND MASONRY
Cement Grouting in cracks in concrete and masonry: Wide cracks, particularly in mass concrete abutments / piers and masonry substructures can be repaired by filling with portland cement grout. This method is effective in sealing the crack in concrete, but it will not structurally bond cracked sections. Applications of cement grouting: i) When cracks are(…)
REPAIR OF ACTIVE CRACKS IN CONCRETE
Methods of Repairing Active Cracks in concrete structures: 1. Drilling and Plugging through Crack: One of the approximate methods would be to drill holes normal to cracks, fill them with a suitable epoxy or epoxy-mortar formulation and then place reinforcement bars (of predetermined sizes and lengths) in them to stitch across the cracks. The bars (…)
REPAIR OF DORMANT CRACKS IN CONCRETE
Following are the Methods of Repair for Dormant Cracks in Concrete: 1. Sealing of Cracks: Sealing of cracks as stand alone repair should be used in conditions where structural repair is not necessary. Isolated cracks whether extending through the concrete section or partially into it, should be sealed at the concrete surfaces. For this a (…)
CONCRETE CRACK REPAIR EQUIPMENT
All equipment employed in the concrete crack repair operation must be inspected before, during, and after the repair project to ensure proper operation of the equipment, safety of the personnel involved in the project, and potential damage to the pavement due to equipment problems. Proper safety procedures in accordance with OSHA guidelines and common sense(…)