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A Look At The Different Fillers Commonly Used To Create Soil Grout

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When the ground is fractured or unstable, soil grouting techniques allow contractors to use equipment to inject a specifically formulated grout into the ground. Once the grout hardens, the ground is much more stable, which can be highly important in construction zones, residential areas where structures are in danger, and even around highways.

The grout used to inject in the ground is made up of several different components, one of which is a sort of aggregate or filler material that is mixed with fine cement powder before it is liquified. Filler can be several different compounds. Here is a look at some of the most commonly used filler agents and their benefits in soil grout. 

Lean Clay 

Lean clay, which is an organic clay that has had most of the minerals removed, is commonly added to soil grout mixtures. Lean clay is often preferred in areas where there is an environmental concern because it is a more natural grout ingredient. However, the material is not as tough and resilient as some other filler materials because it breaks down faster when exposed to moisture. When lean clay is used, it is common for more concrete to have to be incorporated for that very reason. 

Rock Dust 

Rock dust can be harvested in several different ways, but for soil grout making purposes, the dust tends to come from facilities that crush different types of rock and harvest the dust. The dust can actually be comprised of multiple types of rock, which makes for a good and sturdy filler mixture to incorporate into the soil grout. Rock dust blends well with concrete, passes through the injecting equipment without causing problems, and is fairly inexpensive to obtain. Therefore, this filler agent is highly used in the soil grouting process and relied on by many contractors who specialize in this industry. 


Sand can either be harvested or it can be synthetic, and either can be used to make soil grout. Adding aggregate to soil grout, which also has a fair amount of cement in the mix, helps give the mixture a little more stability. Sand, even though it is one of the finest aggregate materials, can help the grout be more stable under the ground. One of the only downfalls of using sand is that the particles must be a certain size, so it does not cause problems with grouting equipment. Most of the sand used in soil grouting is carefully selected for refined particle size.