| 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. |
| Curing |
Light
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. |
