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HM 1000/1250
5. Second Round of Mortar Injection (Grouting)
5.1 Inspecting the foundation holes
1) Is the concrete surface of each foundation hole rough?
▪ If the foundation surface is smooth, then it is necessary to make it rough in order to
reinforce the adhesiveness between concrete wall that was constructed in the primary
foundation work, and secondary grout. (Chipping)
2) Has foreign matter inside of each foundation hole been completely removed?
▪ Rid the hole of any concrete debris or bits of flexible tubes used in making the
foundation hole.
3) Has each foundation hole been soaked up in water?
▪ This is very important because it is to improve the adhesiveness and fluidity of grout
and to prevent it from drying too quickly. Fill the holes with water 12 hours before
grouting, and drain the water right before grouting.
5.2 Selection of secondary grouting material
High-quality grouting material contributes to seamless contact on the leveling block with
improved strength, forming a sound foundation for the machine.
1) Requirements: 1.1m³ : 120 sacks or so (Grout: 25Kg)
2) Compression Strength: At least 400Kg/cm²
5.3 Mixing grout
1) Mix grout and water appropriately for more than 2 minutes using a motorized hand mixer
or a mechanical mixer in compliance with the instructions provided by the grout maker.
▪ Pour a specified amount of water in the container and mix well while pouring grout
slowly.
2) When mixing grout, be sure to meet the specified mixing ratio of water (grout water
ratio). (the specified ratio of water is 16% of the grout weight.)
※ If the amount of water goes over the specified level, it may result in the deteriorated
strength of grout and the buildup of air bubbles in the bottom of the level plate while
drying. (It is recommended to use a beaker to measure the amount of water.)
▪ Amount of Water: 4.0L per one 25Kg sack (water ratio: 16%)
3) A mixture of water and grout should be injected completely in less than 30 minutes after
the mixing.
4) The temperature of the mixture is desirable between 10°C and 20°C when grouting.
▪ Adjust the temperature as appropriate by using hot water in the winter seasons and
cold water in the summer.
HM1000ISE99
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