Cement grouting creates solidified masses by filling pores and imperfections in soil and rock.
- Control ground water
- Support excavations and foundations
- Improve soil cohesion
Cement Grouting (also referred to as slurry grouting or high mobility grouting), uses flowable particulate grouts to fill pores in granular soil or voids in rock. The injection of the cement grout is done at various locations through either single or multiple sleeve port pipes. A sleeve pipe, typically 38 mm to 75 mm diameter PVC or steel pipe, contains several sets of small holes along its length that are enveloped by protective, expandable, rubber sleeves. The sleeves act as one-way valves, keeping fluids outside the pipe from getting in, but allowing fluid on the inside - once sufficiently pressurized - to get out. Grout spread is governed by soil type, degree of soil compaction, grain size distribution, grout type gel time, grout rheology and grouting pressure. The result is a grouted mass that is stronger, stiffer, and has reduced penetrability by water.
This technique can be applied where access is problematic and space is minimal, and is adaptable to existing foundations. Cement grouting can be performed without disturbing normal operations of an existing facility. Real time monitoring of pressure, flow and cumulative grout take is used to constantly evaluate and determine the direction of the grouting program. Its implementation also conveniently results in measurement of the completed work for compilation of records and computation of useful data such as theoretical grout spread and determination of the hydrofracturing threshold.
Earth Retention & Shoring
Eglinton Cross Passages