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What is Foundation Grouting?
The construction of structures on weak ground often requires the soil to be improved in order to ensure the safety and the stability of surrounding buildings. When subsurface investigations of a site disclose the existence of such structural defects, it is necessary to adopt corrective steps to make the formation suitable for the intended use. An operation to correct the foundation conditions is called "grouting". Grouting, as applied to civil and geotechnical construction, involves the injection under pressure of a liquid or suspension into the voids of a soil or rock mass or into voids between the soil or rock mass and an existing structure. The injected grout must eventually form either a solid or gel within the injected voids. EFFECTIVENESS OF GROUTING:
Prior to concluding a grouting operation, additional exploratory holes may be drilled at various locations within the area that has been grouted in order to obtain cores from the formation. If these cores show the existence of sufficient grout to produce good consolidation where voids originally existed, this indicates that the grout operation has been successful. The effectiveness of the grouting operation may be tested by injecting water or grout into the holes from which the cores were obtained. If these holes refuse to take grout, the test indicates that the formation has been consolidated adequately by previous injections. |
The formation under or adjacent to a structure may be grouted for several reasons, such as:
Types of Grouting: Grouting is a valuable tool in the field of construction and the type of grouting chosen should be determined by an evaluation of the aspects of a problem, some of the types of grouting done may include: 1) Pressure grouting 2) Compaction grouting 3) Chemical grouting 4) Jet grouting 
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