Sr, No.
Particulars Nos.
(Minimum required)
1 Set of Bucket of bulk density 30 litres capacity sample
diving (various sizes 15,20,30 litres)
3
2 Riffle Box (Sample Diving Box) 1
3 Bitumen extractor (Hand / electrically operated) 1
4 Field Density (sand replacement method) 1
5 Straight edge 3 meter long ISMC 50X100 1
6 M.S. Camber plate 2.75 meter 3.5 meter long 1 No. each
7 Constant temporary Hot Water bath 1 No.
8 Electronic balance capacity upto 1200 Gm. 1 No.
9 G.I. Trays of various sizes 12
10 Digital thermometer capacity upto 2000C with100
least count
1
Sr, No.
Particulars Nos.
(Minimum required)
12 Chemicals (Benzene / Trichloroethylene) 250 litres
13 Filter papers 500/Season
14 Weight box with 5 Kg. to 1 Gm. weight 1
15 Fractional weight box and pan balance 1
16 G.I. Brass sieves if various sizes for gradation 1 No. each
17 Pick axes 2
18 Cooking gas / Kerosene burner with cylinder 1
19 Impact test apparatus (for coarse aggregate) 1
20 Flakiness and Elongation test guage 1
21 Penetrometers with standard needles for asphalt test. 1
22 Crushing strength machine 1 No.
23 Concrete cube moulds 9 Nos.
56 CLAUSE IN THE CONDITION OF CONTRACT:
a. All materials and workmanship shall be of the respective type
described in the contract and in accordance with the Engineer’s instructions and shall be subjected from time to time such tests as the Engineer may direct at the place of manufacture or fabrication, or on the site. All samples shall be supplied by the Contractor.
b. No work is to be covered up or put out of view without the approval
of the Engineer for his examination and measurements.
c. During the progress of the works, the Engineer shall have the
power to order, the removal from the site any unsuitable material, substitution of proper and suitable material and the removal and proper re-erection notwithstanding any pervious test or interim payment therefore and of any work which in respect of materials or
workmanship is not, in the opinion of the Engineer in accordance with the contract.
57 CONTRACTOR’S FACILITY:
According to the contract, the contractor is responsible for the quality of the entire construction work. To meet this requirement:-
a. The contractor shall set up his own laboratory at location(s)
approved by the Engineer. The laboratory shall be equipped with modern and efficient equipment with the sufficient standbys, suitable to carry out the tests prescribed for different materials and work according to the specifications. The lost of equipment to be procured and the facilities to be provided shall be got approved by the Engineer. The equipment shall be mentioned in a workable condition to the satisfaction of the Engineer.
b. Sampling and testing procedures shall be in accordance with the
relevant standards of BIS (Previously called ISI) or IRC. Frequently of testing shall be laid down in the Ministry’s Specifications for
Roads and Bridges work (2nd revision). In the absence of relevant
Indian Standards, sampling and testing procedures shall be approved by the Engineer.
c. The laboratory should be manned by a qualified materials
Engineer assisted by Material Inspector / Technicians, and the set up should be got approved by the Engineer.
d. The contractor should prepare printed proforma for recording
readings and results of each type of test after getting the formats of the performance approved from the Engineer. He should keep a daily record of all the test conducted by him. Two copies of the test results should be submitted to the Engineer for his examination and approval, of which one copy will be returned to the contractor for being kept at site of work.
The materials Engineer of the contractor should keep close liaison with the Quality Control Unit of the Engineer and keep the latter informed of the sampling and testing program so that the Engineer’s representative could be present during this activity, if considered necessary.
58 In case of cement concrete works:
a. Besides manufacturer’s test certificate for quality of cement at
least one set of physical and chemical tests should be conducted for each source of supply for verification. Where the quality is in doubt, or where the cement had been stored for long periods or in improper condition, the Engineer shall call for testing the cement at more frequent intervals.
b. Job mix formula based on trials carried out in the contractor
laboratory should be got approved by the Engineer.
c. The mineral aggregates should be tested for their properties.
Water to be used for mixing should be tested for chemical impurities.
d. Checking for stability and sturdiness of form work.
e. Ensuring that the crucial equipment lime mixers and vibrators
are in working order before start of work.
f. Control on water cement ratio.
g. Control on workability and time elapsed between mixing and
placing of concrete.
h. Control on compaction and finishing.
i. Tests on cubes samples at 7 to 28 days.
j. Checks on provisions for adequate curing.
58.1 In case of machinery work, control should be exercised on the quality of the materials (e.g. stone, brick, cement, etc.) as also on mortar proportion.
58.2 For R.C.C. work, quality of steel in each batch may be approved on the basis of test certificate. The reinforcement layout should be checked for conformity with approved drawings and bar bending schedules. All laps should be checked for conformity with the specifications. The reinforcement should be free from oil and loose rust scale should be properly tied with binding wire.