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Machinery and equipment which have precise tolerances for alignment or require uniform support cannot be placed directly on finished concrete surfaces. Both concrete surface and the soleplate base have irregularities which result in alignment difficulties and bearing load concentrations. For this reason, soleplates are aligned & levelled and the resulting space between the soleplate base and the foundation is filled with a load transfer material. The load transfer material most frequently used are
• Non-shrink cementitious grout
• Epoxy grouts.
A good quality grout, whether resin-based or cementitious must provide good load transfer and be easy to apply under most conditions.
Grouts generally work best at 50°F to 80°F (10°C to 27°C). Cold weather retards strength gain and set time. Hot weather accelerates setting time and causes premature drying of the grout. Provide heating or cooling, as necessary, to compensate for extremes in ambient temperatures and resulting variations in cure time.
NON-SHRINK CEMENTITIOUS GROUT
Cementitious grout is supplied as a ready to use dry powder. The addition of a controlled amount of clean water produces a free flowing, non-shrink grout for gap thicknesses up to 100mm. It is a blend of Portland cement, graded fillers and chemical additives which impart controlled expansion in the plastic state whilst minimising water demand. The low water demand ensures high early strength. The graded fillers are designed to assist uniform mixing and produce a consistent grout.
Epoxy grout resin grout is solvent free and designed for grouting of gap widths of 10 to 75 mm. It is supplied as two or three component system consisting of base, hardener and specially graded aggregate. The components are supplied in the correct mix proportions designed for whole pack mixing on site.