Alkali Resistant
Concrete Durosil CR
Durosil CR concrete
has been developed to complement Durosil Dr11 Acid Proof Concrete
by providing an easy to lay alkali proof concrete for those applications
where the pH of the solution/solids is between 7-14. It is not especially
resistant to acidic conditions but will tolerate short exposure
to pH levels less than 7 provided the acid is neutralised.
The product
consists of a blend silica sands, pure quartz, calcium aluminates
and additives which when mixed with water produces a grey strong
concrete.
The Durosil
CR grade exhibits all the properties that you would normally associate
with a concrete material. It can be placed by tamping or trowelling
into place as a low water content screed (40mm) or poured and vibrated
behind shuttering using standard equipment and techniques. As will
all screeds the substrate will need to be prepared to remove any
combination or laitences to provide a sound base with a suitable
profile.
Physical
Properties
Bulk
Density |
2,350 kg/m3
|
Cold
Crushing Strengths |
7 days
– 29.5N
28 days – 39.0N |
Grain
Size |
0 – 8mm |
Temperature
Limitation |
700°C |
Adhesion
to Ceramic Earthenware |
Excellent |
Moh’s
Hardness |
7 |
Setting
Time |
4 – 6 hours |
Until now it
has been necessary to call on Resin Technology to provide various
mortars to resist the many differing types and strengths of acid
used in chemical processing. Furane, polyester and phenolic resins
are expensive, difficult to use and by no means user friendly.
BJ Construction
are manufacturing under licence an acid resistant mortar which is
safe and fume free in use, as easy to use as sand/cement mortar
and a fraction of the cost of resinous mortars.
It will resist
all acids, in all concentrations with the sole exception of hydrofluoric.
It is not resistant to alkaline materials.
The product
is supplied as a pre weighed kit, comprised of a bag of graded aggregates
and flours and a bottle of mixing liquid, which can be easily and
quickly mixed using conventional equipment. Tools, plant and equipment
can be cleaned with water.
Bulk
Density |
As cast
dried
At 110ºC |
2.04 tonnes/m³
1.99 tonnes/m³ |
Grain
Size |
|
0 – 1 mm |
Cold
Crushing Strength |
Typical
3 Day |
20N |
Modulus
of Rupture |
48 hrs |
5N |
Temperature
Limitation |
|
700ºC |
Adhesion
of Ceramic Earthenware |
|
Excellent |
Setting
Time |
|
4 hours |
Moh’s
Hardness |
|
7 |
|