| The effectiveness of cement grouting and the degree of improvement attained in the grouted sand properties is known to depend on many factors. The effect of the initial moisture state of sands prior to permeation grouting on the engineering properties of microfine cement grouted sands was investigated. Three testing sands and a naturally occurring sand were used to pack columns of two different lengths for grouting. Columns were also packed with a horizontal layer of fine sand (seam) placed at the midsection of medium fine sands. The sand-packed columns were injected under initially dry or saturated conditions using MC-800 microfine cement grout at three W:C ratios. The effect of the initial moisture state on injectability of the grout, and the cement content, coefficient of permeability, and unconfined compressive strength of the grouted sands was assessed. Sands initially saturated generally exhibited easier injectability, although, evidenced lower cement content, strength, and a relatively lower reduction in permeability compared to initially dry sands. (Abstract shortened by UMI.)... |
