Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

3.2 Tests During Construction
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Quality Assurance Handbook for Rural Roads
The quality control tests to be carried out during construction are indicated in Table 502.3.
TABLE 502.3 : QUALITY CONTROL TESTS DURING CONSTRUCTION
Type of Test Frequency
1. Temperature of Binder, when cutback is to be used Regularly
2. Rate of Spread of Binder At least two tests per day.
3. Curing of Primer Before any subsequent treatment.
3.3 Quality Control Checks
The Junior Engineer shall carry out checks daily and record the result in his own handwriting.
C. Do’s and Don’ts
1. Use slow setting emulsion and restrict the use of
cutback to subzero temperature conditions or
emergency operations.
2. Use only pressure sprayers.
3. Preferably lay a trial section.
4. The Contractor to demonstrate at a spraying trial to
ensure that the equipment is capable of producing a
uniform spray.
503. TACK COAT
A. Methodology
Do’s Don’ts
1. Do not apply primer when the atmospheric temperature
in shade is less than 10°C or when the weather is foggy,
rainy or windy.
2. Do not allow pouring of primer using perforated cans.
3. Do not allow traffic on primed surface.
4. Do not apply bituminous material to a wet surface.
1. Use a rapid setting bitumen emulsion for applying a tack coat, the use of cutback being restricted
to areas having sub-zero temperature or for emergency applications.
2. The surface on which tack coat is to be applied should be clean, free from dust, dirt and any
extraneous materials and dry.
3. The surface should be prepared as per sub-section 501.
4. The binder should be sprayed uniformly over the surface using suitable bitumen pressure sprayer
capable of spraying bitumen and emulsion at specified rates and temperature so as to provide a
uniformly unbroken spread of bitumen emulsion. For smaller jobs, a pressure hand sprayer may
be used. Normal range of spraying temperature should be 20°C-60°C in case of emulsion and
50°C-80°C in case of cutback. The rate of application depends upon the type of surface and is
given in Table 503.1.
5. The surface should be allowed to cure until all the volatiles have evaporated.