Permeation grouting and its uses

The term ‘Permeation grouting’ is in widespread use, but it is often misused. Although it seems to describe a specific type of grouting, the term is not specific, as it refers to a wide array of procedures. It is a more correct term for what is commonly referred to as pressure grouting. Pressure grouting is a direct pressure injection of a fluid grout into the ground to fill the spaces between the particles. This method of grouting is one among the oldest form of soil grouting. First you drill a hole in the soil, as soil is densifies by injecting it. You can insert an injection pipe into the ground then pump any number of liquefied materials into the problematic area. This material permeates the space between the granular soils and thus locking them together. In some cases, certain depth zones of the layers are targeted. Please keep a note of the specific things like the diameter of the hole, type of injection pipe and other raw materials.

There are many different requirements that can be fulfilled permeation grout injection into soil. Obviously, the type of grout material and the procedures used for its injection will vary according to the requirements of the individual application. Both chemical solutions and ultra-fine cement grouts are usually used, as the grains are sometimes too large to penetrate the coarsest sand and grit. Many a times, use of ordinary cement to save the cost does not yield desired results as particle size of ordinary cement is too big to get penetrates in fine pores. All these options provide a project designer with a wide range of alternatives. Any effective grouting program requires a thorough evaluation of the options. The challenge is to find the best combination of methods and materials to achieve all technical objectives, while accommodating other factors such as existing ground properties, cost and accessibility.

Cementitious ultra fine grouts are designed for such application. Particle Size Distribution (PSD) is an important parameter for selection of right ultrafine cementitious grouts. Alccofine range provides not only various options of PSD but also of chemical composition to suit the strata. Some of the typical uses of permeation grouting include adding bearing capacity to soils to achieve higher loads, earth retention excavation along structure or pit, obstructing water movement through soil. It is also used for footing support, grouted tunnel support, pit excavation below waters and to limit ground movements during excavation and construction.