Concrete Cracks

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 […]

EPOXY BASED INJECTION GROUTING OF CRACKS IN STRUCTURES

Epoxy injection grouting is a method of repairing cracks in concrete structures. Equipment required for epoxy based injection grouting, procedure for grouting will be discussed here. Epoxy based grouting is preferred to cement due to property of quick setting, very low shrinkage, excellent adhesion, high strength, low viscosity to penetrate even hair cracks and good […]

SELECTION OF CONCRETE REPAIR MATERIALS

Selection of concrete repair materials is based on evaluation of type of damage, types of materials to be used for repair and the local condition. Concrete repairing material must be compatible with the concrete being repaired. Variety of materials is available for repair of concrete structures. The choice of such materials is based on performance […]

SURFACE PROTECTION METHODS FOR CONCRETE

Surface protection of concrete structural members is necessary to protect the structure from damage due to environmental considerations. Corrosion of reinforcement due to permeability of water / moisture, chemical attack on structural members, structures nearby sea-coast etc. are all responsible for damage to concrete structures. So, surface protection of concrete members becomes necessary to prevent […]

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  […]

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  […]

CAUSES OF CONCRETE SHRINKAGE CRACKS

Shrinkage cracks in concrete occur due to change in moisture of concrete. Most of the building materials like concrete, mortar, burnt clay bricks are porous in their structure in the form of inter-molecular space. They expand when they absorb the moisture and shrink when they dry. This is the main cause the concrete shrinks on […]

REPLACEMENT CONCRETE: MATERIALS AND APPLICATIONS

Replacement concrete is a method of repair for defective concrete when the defects or cracks in concrete have large area. In this method of concrete repair, defective concrete is removed from the structural member and area is prepared for repairs and then replacement concrete is used. Concrete repair using this method is used when the […]

CAVITATION DAMAGE IN CONCRETE AND PROTECTION

Cavitation damage on concrete surface is most common in case of spillway in dams. This leads to cracks on the concrete surface which further increases the risk of damage to concrete by means of sulfate attack, freeze-thaw, alkali-silica reaction and other means. Cavitation damage occurs on concrete surface when discontinuity or irregularities is encountered in […]

STEPS FOR CONCRETE DAMAGE REPAIRS IN STRUCTURES

Repair of concrete is needed time to time as the structure gets old due to several reasons. We will discuss the steps involved in the process of repair of concrete structures. Following are the steps involved in the repair of damaged concrete: 1. Determination of cause of Concrete defects: The first and important step for […]