The grout to be pumped in the Handy-Grout should be one part Portland or masonry cement to one or two parts fine, screened masonry sand. The mixture should be a thick creamy consistency that will not allow the sand to separate from the cement. If a liquid mix is desired, it is recommended that a straight cement water grout be used. An admixture, such as Bentonite clay, can be used for more lubrication or if separation is a problem. Mixtures of straight Bentonite and water or gypsum plaster may also be used along with a wide variety of other high viscosity slurries.
Note: Max particle size is 3/16". Some pre-blended grout are not pumpable.
Example - Sanded Grout Mix
Any pumpable grout mix must have these three characteristics, namely:
1) Have a smooth creamy appearance
2) Be the color of the cement used (usually gray)
3) Be just wet enough to be pour-able
A suggested starting mix is as follows:
1 - 94# bag Cement
1-1/2 to 2 C.F. Fine Masonry Sand
5-1/2 to 6 gallons of water
Mix the cement into the water to obtain a uniform slurry, then slowly add sand until the mix just begins to lose the cement color. Adjust the water to compensate for the wetness or dryness of the sand to get a pour-able grout.
The shape, size and gradation of the sand will determine the amount of sand the above mix will actually hold. The ideal sand for pump-able grouts is round as opposed to sharp and angular.