the compaction of sand-cement mixtures in road bases can be difficult because the apparent cohesion of the damp mixture is low and there is a tendency for the surface to be overstressed. it has been suggested that the addition of filler material will augment the fine fraction of the mixture and increase the apparent cohesion, making the compaction operation less critical. this report describes a laboratory investigation of the effect of fillers on the properties of sand-cement. measurements of the tensile and compressive strength and the shrinkage characteristics were used to assess the changes in the sand-cement. when the specimens were sealed to prevent loss of moisture, they invariably expanded and it was not until the sealing film around the specimens was removed that shrinkage commenced. inert fillers only caused minor changes in the properties of the sand-cement but pulverised fuel ash did alter them significantly. the properties are considered in relation to the changes which they may cause in the performance of road bases constucted with this material. (a)

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