Technical Specifications - UNDP

(c) Blowholes not more than about 10mm in diameter will be permitted but otherwise surface is to
be free from voids honey combing and other large defects .
(d) Variation in colour resulting from the use of an from discolaration due to contamination or grout
leakage .
The finish will be left as struck , making good or small defects will normally be permitted but only
after inspection by the Engineer. All blowholes shall be filled with a matching mortar to an
approved sample unless otherwise instructed by the Engineer. All faces shall be protected from
damage , especially arrisses .
All faces shall be protected from rust marks and other surface disfigurements. Form tie holes shall
be filled with a matching mortar to an approved sample accepted by the Engineer .
2 - Fine finish ( Fair Face)
General Requirements :
a) Produce a smooth even finish with an impervious sheet metal .
b) Make panels as large as is practicable and arrange to approval .
c) Blowhole not more than about 5mm in diameter will be permitted but otherwise surface is to be
free from voids, honey combing and other defects .
d) Variation in colour resulting from the use of an impervious form lining will be permitted , but the
surface is to be free from discoloration due to contamination or grout leakage .
e) Concrete cover spacers shall be used only if approved .
The finish is to be left as struck . Making good will not normally be permitted . All form tie holes
are to be filled with a matching mortar to an approved sample . Wire form ties shall not be used .
Approval of the Engineer for the position of tie holes is to be obtained before use .
Quality Control Testing Etc.
Prior to commencing the work the contractor shall make available on site the following minimum
approved equipment kept in good condition at all times :
- Six Cube moulds .
- Slump cones .
- Thermometer .
- Any other accessories as required by the Engineer .
All samples and testing shall be done in the presence of the Engineer or his authorised representative
either on site or in an approved testing laboratory in the area .
The frequency of testing shall be as noted in the clauses of this section and whenever required by
the Engineer.
The works Test Cubes shall be made as follows for types of concrete (A) , (B) , and (C) :
(a) At least three times weekly per mixing plant .
(b) At least once for three individual parts of the structure .
(c) At least once per 100 cubic meters of Concrete or fraction thereof .
For types (D), and (E) concrete the rate shall be once per each 100 cubic meters or fraction thereof .
At least six cubes shall be made at one time . Two of the six cubes are to be tested at seven (7) days
. The remaining four cubes are to be tested at 28 days , and their average strength must not fall below
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