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Lime Concrete – Guide

Lime Concrete for Floors, exposed aggregate / tamped finish

Ingredients.10 x 66 lb bags (660 lbs) NHL 5 per cubic yard (or
27 cubic feet) of aggregates consisting of 1 part sharp sand: 2 parts
1/2″ to 3/4″ aggregate and approximately 3 to 3.5 gallons
of water per 66 lbs. of lime.
Mixing.Mix dry to achieve
a uniform color in a pan mixer or roller pan mill, slowly add clean water until
semi dry, just sufficient to allow mix to bind when squeezed in hand. Free fall
mixers can cause balling.
Substrate.Lime concrete should be laid on a compacted sub base
of clean 2″ to 3″ clean screened
aggregate (# 2 Stone)(minimum 6″ thick base). The greater the
thickness of the sub-base, the better the insulation properties. Damp
proof membranes are not necessary. Lime concrete can be laid directly
on to sub soils that contain clays that have had a 3/4″ layer
of NHL 5 hydraulic lime rotovated into them and compacted (sub soils
should be analysed before proceeding). Damp proof membranes are not
necessary.
Laying.The concrete is placed in a single layer of 2″,
or 2 layers of 2″ to make a 4″ layer depending on purpose.
2″ will be sufficient for normal foot traffic and 4″ for
light vehicular traffic. It should be well rammed either by hand or
with a mechanical compaction plate to the desired level. Form mechanical
key between layers. Lay green on green (within 24 hours).
Finishing.Exposed
aggregate finish: after 24 hours the surface of the compacted and levelled concrete
is brushed with a stiff yard broom initially, then a soft brush. On large areas
it may be necessary to treat the surface of freshly compacted concrete with an
inhibitor to hold back the set.
A trial panel should always be done.
CuringLight
mist with clean water for 72 hours or more depending on conditions.
Never
lay on a frosted or exceedingly hot surface. Protect from extreme heat, freezing,
excessive wind, strong direct sunlight and rain. Ambient temperature range should
be
40oF-85oFwith low to average humidity.
Protection.Foot
traffic should be avoided for 7 – 10 days depending on the weather. Cover with
protective walkways 12 hours after placing. These should remain in place for at
least 2-3 weeks or longer if possible.

 

The above details are given for information purposes only. Final dosages and application
should be checked with our technicians

Lime Concrete for Fine / ruled finish floors

Ingredients.660lbs NHL 5 per cubic meter of aggregates consisting
of 1 Part sharp sand: 2 Parts fine sharp sand.
Mixing.Mix
dry to achieve a uniform color in a pan mixer or roller pan mill, slowly add
clean water until the correct moisture is achieved (semi dry) just sufficient
to allow mix to bind when squeezed in hand.  Free fall mixers can cause balling.
Substrate.Fine lime concrete finish should be laid on a freshly
compacted and keyed sub base of 2″ thick lime concrete made as
per exposed aggregate concrete.
Laying.The concrete is placed in a single consistent layer
of 3/8″ to 1″.  It should be well rammed either by hand
or with a vibrating screed to the desired level.  Lay green on green.
Finishing.Tighten
in the surface with a cross-grained wood float to a level plane, polish after
initial stiffening with a steel float if desired.  Lining out or ruling after
12 hours.A trial panel should always be done before attempting large areas.
Curing.Very light mist with clean water in drying conditions
for 72 hours.Protect from extreme heat, freezing, excessive wind,
strong direct sunlight and rain.  Ambient temperature range should
be 40oF-85oF with low to average humidity
Protection.Foot traffic should
be avoided for 7 – 10 days depending on the weather.  Cover with protective walkways
12 hours after placing.  These should remain in place for at least 2-3 weeks or
longer if possible.

 

The above details are given for information purposes only. Final dosages and application
should be checked with our technicians.

Lime concrete sub base for slabs.

Ingredients.5 – 66 lb or (330 lbs)NHL 5 per cubic meter of well graded sharp
sand #6 to #200
Mixing.Mix
dry to achieve a uniform color in a pan mixer or roller pan mill, slowly add
clean water until until the correct moisture is achieved (semi dry), just sufficient
to allow mix to bind when squeezed in hand.  Free fall mixers can cause balling.
Substrate.Outdoors: lay on a compacted sub base of clean 2″ screened
aggregate (3″ minimum).  Should a membrane be required use a
geotextile  (not polythene).
Indoors: lay on a compacted sub base of clean 2″ – 3″ aggregate
(4″ minimum).  The greater the thickness of the sub-base, the
better the insulation properties.  Damp proof membranes are not necessary.
Laying.Placed in a single layer of 2″.  It should be well rammed
either by hand or with a mechanical compaction plate to the desired
level.  Form mechanical key and lay a further 20mm layer loose ready
to set down slabs.  Lay slabs as normal.

 

The above details are given for information purposes only. Final dosages and application
should be checked with our technicians.

 Jointing / Pointing mortar for slabs.

Ingredients.NHL5 at 1:2.5 with sharp concreting sand #6 to #200 for joints 1/4″
to 3/8″ wide.   Use fine sharp sand #16 to #200 for joints up
to 1/4″.  Avoid saturated sands.
Mixing.Mix
ingredients dry to achieve a uniform color.  Add: the minimum of water, the mortar
should be quite dry.
PlacingDampen
the joints of the slabs taking care not to wet the surface of the slabs, brush
mix into joints and compact with pointing key, clean all excess from slabs and
lightly dampen joints with clean water several times over a period of approximately
two hours depending on weather conditions.
Curing.Never
lay on a frosted or exceedingly hot surface.  Protect from extreme heat, freezing,
excessive wind, strong direct sunlight and rain.  Ambient temperature range should
be
40oF – 85oF with low to average humidity.
Protection.Foot
traffic should be avoided for 48 hours depending on the weather.  Provide walkways
with boards during and after placing to distribute any foot traffic/ loading.

 

The above details are given for information purposes only. Final dosages and application
should be checked with our technicians.

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