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Technical paper: Chemical grouting – 2

GS Littlejohn, BSc(Eng), PhD, CEng, FICE, MIStructE, FGS. This paper was first published in GE’s April 1985 edition.

Grout systems

Grout selection

Whilst most of the recent developments in chemical grouting technology have been in the field of single fluid low viscosity systems capable of penetrating fine grained materials, soil and rock formations vary significantly in terms of permeability and porosity, the former being particularly sensitive to small changes in void size. The selection of the most suitable chemical grouts is therefore largely a matter of judgement on the part of the experienced engineer and he should also be aware of the range of grout suspensions available since considerable economies can result from the use of these cheaper grouts in advance of the more costly and penetrative chemicals. 

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