Abstract
With more concern being shown in matters concerning safety and environmental pollution, developments described in the field of chemical grouts have been aimed at the formulation of less toxic materials. The article details two main groups of grouting materials for near-surface soil stabilization: particulate grouts which contain cement, clay or other coarse particles; and, true fluid grouts having no shear strength and a controllable gelling time. This second group includes most chemical grouts of the following types: silicate systems; acrylamide-based formulations; phenoplast resins; and, other polymer grouting mixtures. The main features and applications of this group of grouting mixtures are briefly described. For near-surface construction work the higher viscosity silicate systems offer strength and economy, while the acrylamide and acrylate grouts have low viscosity and quick gelling times. Methods of site investigation and of controlling grout mixing procedures are also detailed. (TRRL)
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