PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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Water/cement ratio: The water/cement ratio will be determined after mix trials by<br />
the Contractor in the presence of the Engineer or his representative. If batching is<br />
by volume, the Contractor shall be required to fabricate such volumetric batches<br />
and water containers as the Engineer may determine and require so as to simulate<br />
the ideals of the trial mix without recourse to assessments by site staff and<br />
workmen.<br />
Weighing: The Contractor shall make available always a weighing machine if so<br />
required, guaranteed by the Contractor for its accuracy, for weighing cement and<br />
batches of aggregate as and when the Engineer or his representative or his assistant<br />
may require. The machine shall be capable of weighing upto 75kilograms and shall<br />
be accurate to half (0.5) kilogram.<br />
Compaction: All concrete shall be thoroughly compacted and fully worked round<br />
the reinforcement by vibration just sufficiently so that the appearance of laitance is<br />
kept to a minimum and in such manner as directed by the Engineer’s<br />
Representative. Under no circumstances shall concrete be compacted by trowels or<br />
the like.<br />
Transport and placing: Fresh concrete from the mixer shall be transported where<br />
required by the quickest and most efficient means so as to prevent pre-set or<br />
segregation or any loss of ingredients and shall maintain required workability. Any<br />
laitance from previous mixes shall be removed.<br />
7.5 Sampling, testing and storage of materials.<br />
Samples of aggregates for mix design and determination of suitability shall be taken<br />
under the supervision of Engineer and delivered to the laboratory well in advance of<br />
the scheduled placing of concrete. Records of tests made on proposed aggregates<br />
and on concrete made from this source of aggregates shall be furnished to the<br />
Engineer in advance of the work for use in determining aggregate suitability. The<br />
cost of all such tests, sampling etc. shall be borne by the Contractor.<br />
Materials shall be tested as hereinafter specified and unless specified otherwise, all<br />
sampling and testing shall be performed by testing laboratory approved by<br />
employer at the contractor’s expense.<br />
GTS : General Technical Specification. Page 54
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