Specification Part 3 - Road & Bridge Works - Urban Administration ...

(ii)Smooth tyres shall be used. Final rolling and smoothing of the surface should be completed
using steel wheel rollers.
(iii)The Contractor shall demonstrate at laying trials that his proposed laying and compaction
methods can achieve a satisfactory result.
519.2.4. Opening to traffic:
(i)Traffic shall not be allowed to run on new work until all the water or volatiles in the mixture have
evaporated, as determined by the Engineer in charge.
(ii)The rate of evaporation will be influenced by the temperature, humidity and wind conditions.
519.2.5. Surface finish and quality control of work:
(i)The surface finish of construction shall conform to the requirements of Clause 902.
(ii)For control of the quality of supplied materials and the works carried out, the relevant
provisions of clause 501.8.4.1.
519.2.6. Arrangements for traffic: During the period of construction, arrangements for traffic
shall be made as per in the direction of Engineer in charge.
519.2.7. Measurement for payment: Designed Cold Mix shall be measured as finished work, for
the area covered, in cubic meters, by weight in metric tonnes, or by square meters at a specified
thickness as specified in the Contract.
519.2.8. Rate:
(i)The contract unit rate for Designed Cold Mix shall be payment in full for carrying out the
required operations including full compensation for all components listed in Clause 501.8.8.2. (i)
to (xi).
(ii)The rate shall cover the provision of the specified grade of cutback in the mix at 5 per cent of
the weight of the total mix or emulsion at 8 per cent of the weight of the total mix, with the
provision that the variation of quantity of binder will be assessed on the basis of the amount
agreed by the Engineer in charge and the payment adjusted as per the rate for cutback or
emulsion quoted in the Bill of Quantities. Recipe Cold Mix
Recipe Cold Mix
519.3. Recipe Cold Mix
(i)This Specification is based on BS434: Part 2:1984 which contains additional information.
(ii)These are premixes made with emulsion binder which are laid immediately after mixing and
while the emulsion is still substantially in an unbroken state.
(iii)These mixes are considered suitable for use only for emergency and minor repair work and
temporary road surface improvement.
519.3.1. Materials
519.3.1.1. Binder:
(i)Emulsions of sufficient stability for mixing with the particular graded aggregate should be used.
(ii)Grades of emulsion quoted are in accordance with BS434: Part 1:1984 but comparable grades
to IS or AASHTO specifications may be used.
(iii)Guidance on selection of an appropriate grade of emulsion is given in the Manual for
Construction and Supervision of Bituminous Works.
(iv)The corresponding grades in IS: 8887 are only broadly classified as RS, MS and SS and
further sub- classification is not available at present.
519.3.1.2. Aggregates:
(i)Any normal, clean, but not necessarily dry, aggregate can be used, provided that it has a
sufficiently high crushing strength with regard to the traffic to be earned. Typical grading is given
in Table 500-40.