12
PUMA 480LM
P48LMISE98
4. Second Round of Mortar Injection (Grouting)
4.1 Checkpoints before injecting mortar
When the temporary installation is completed, inject mortar into the foundation holes for
the machine before curing the surface. This process is very important because it affects
the accuracy, strength and lifecycle of the machine and more. For this reason, a correct,
well-ordered workflow is required for each process.
(1) Is the concrete surface of each foundation hole rough?
(2) Has foreign matter inside of each foundation hole been completely removed?
(3) Has each foundation hole been soaked up in water?
▪ Keep the concrete soaked in water for at least 12 hours before injecting mortar, and
drain the water right before the injection. This is to enhance the adhesiveness of the
injected mortar and to prevent the mortar from drying too quickly as well as to
improve the fluidity of the mortar.
4.2 Blending the mortar mixture
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.
2) A mixture of water and mortar should be
injected completely in less than 30 minutes
after the mixing. Otherwise, the mixture may
get started with a chemical reaction.
3) The temperature of the mixture is desirable between 10ºC and 21 ºC when grouting. (Do
NEVER perform the grouting at below 0 ºC)
4) When mixing grout, be sure to meet the specified mixing ratio of water (grout water
ratio). (the specified ratio of water is about 15% 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.
※
Changes in compression strength of grout according to water ratio (example)
Water
Ratio
Compression Strength (Kgf/cm²)
20˚C Flow
(30 min)(mm)
Initial
Hardening Time
(Min)
Day 1
Day 3
Day 7
28일
13%
490
700
830
13%
490
700
14%
440
660
815
14%
440
660
15%
340
640
800
15%
340
640
16%
320
550
630
16%
320
550
17%
290
480
550
17%
290
480
