1. Preparations
The substrate surface should be good clean, mud; small
particles; any impurity shall be remove, than presoaked
for several hours and swept clean of any free water.
If rebar is exposed, concrete must be chipped out all
around and behind 15mm of exposed bar.
(1) Materials
*Cement: Portland cements shall be obtained from suppliers
that have QUALITY ASSURANCE system for product conformity
reviewed without objection by body accredited by Republic
of China Accreditation Service or equivalent.
*Sand: To be chosen such sand with suitable grading
that does not contain a foreign matter such as mud and
salt , and is a hard quality.
*Mixing Water: To be used natural fresh water that does
not contain oil, salt and organic matter.
(2) Cleaning of Concrete Surface
Oil, laitance and mud on the concrete surface should
be removed off before grouting, and saturate thoroughly
the concrete with clean water.
(3) Working place
Avoid vibration in the nearby working place.
2.Form
Forms should be assembled so tightly as to prevent grout
from leaking, and seal the gap with stiff mortar or
soft tape.
3.Set up the injection whole and breathe whole
The injection whole and breathe whole will place in
different side in principle.
Place the injection whole near the bottom of the form,
and seal the contact part of the injection pipe and
the form.
Place the breathe whole near the top of form, and insert
a 30cm length and 3/4” diameter pipe into the form.
Leave 20cm length outside.
4. Mixing Method of Grouting Mortar
A mechanically powered grout high shear vane mixer should
be used for lager quantities.
Accurately measure the correct water quantity (35%~42%
by weight of cement), sand, cement, aggregate into the
mixer. With the mixer running, slowly add the total
contents of the AC-110. Continuously mix for a further
3~5 minutes to ensure that the grout achieves a smooth
state.
The AC100 only need water to mix.
5. Grouting
In grouting work, will be use squeeze machine to grouting
at rate 7.5~30 l/min, start the operation one side by
gravity flow or pumping depending on the situations
of the grouting places, followed by attaining to the
opposite side, so as not to leave any air.
When grouting is performed on the machine base-plate
where vibration is transmitted by running machines nearby,
stop to operate those machines until the initial strength
attained to some 50kg/cm2.
6. Curing
On completion of the grouting operation, exposed areas
should be thoroughly cured. This could be done by continuous
application of water or wet hessian.
7. Finish
Remove the form.
8. Limitations
When the air or contact surface temperatures are 5°C
or below, warm water(30-35°C)is recommended to accelerate
strength development.
For ambient temperatures below 10°C the formwork should
be kept for at least 48 hours.
At night ambient temperatures above 35°C cool water
(15-20°C) should be used for mixing the grout prior
to placement.
9. Care in Storage
Store in dry condition, high temperature and high humidity
location are no ideal place to store the material.
10. Precautions
Gloves and goggles should be worm during mixing and
applying.
If contact with skin occurs, wash with water.
Splashes to eyes should be washed immediately with plenty
of clean water and medical advice sought.
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