Trámites para formalizar una fábrica en Villa de Merlo

Seal coats shall not be placed when the ambient temperature is less than 15o_{C (60}o_{F) nor} during rain, fog, dust-storms or other unsuitable weather.

408.03.2 Equipment Required

The equipment used by the Contractor shall include but not be limited to the following: a. A self-powered bituminous material distributor in accordance with Clause

403.06 of these Specifications.

b. A self-propelled rotary power broom. Power brooms shall be self-propelled and equipped with a cylindrical, rotating nylon bristle brush of not less than 760 mm in diameter and not less than 1800 mm in length. The brush shall be capable of being angled to the right and left with adjustable ground pressure.

c. A self-propelled aggregate spreader of approved design supported by at least 4 wheels equipped with pneumatic tyres on two axles. The spreader

shall be equipped with positive controls so that the required amount of material will be deposited uniformly over the full width of bituminous material. (Not required for Fog Seal). Minimum width of spreader box shall be 3.7 metres.

d. A minimum of one steel wheeled and one pneumatic tyred roller meeting the requirements of Clause 408.03.5 of these Specifications shall be provided. (Not required for Fog Seal).

e. A water truck equipped with a pressurized spray bar capable of applying a uniform fog spray as directed by the Engineer.

f. Air compressors, hand tools, etc. as required for preparation of the surface.

408.03.3 Surface Preparation

Where seal coats are to be applied to existing pavement surfaces, any pavement repairs shown on the Drawings or directed by the Engineer shall be completed in accordance with Clause 407 of these Specifications. Immediately before applying any bituminous material, all dirt, dust or other objectionable material shall be removed from the surface and cracks shall be sealed in accordance with Clause 407.03.5 of these Specifications as required. When so ordered by the Engineer, the surface shall be slightly dampened with a light application of water just prior to the application of bituminous material.

Where seal coats are to be applied directly to the subgrade or aggregate sub-base, the surface preparation shall be in accordance with Clause 405.03.4 of these Specifications.

408.03.4 Applying Bituminous Material

Bituminous material shall be applied by means of the pressure distributor in a uniform, continuous spread over the section to be treated and within the temperature range specified. The rate of application of bituminous material shall be as directed by the Engineer. A strip of heavy paper, approximately 1 meter in width extending beyond the width of spray from the distributor shall be used at the beginning of each spread. If the cut off is not positive, the use of paper may be required at the end of each spread. The paper shall be removed and disposed off by the Contractor. The distributor shall be moving forward at proper application speed at the time the spray bar is opened. Any skipped areas or deficiencies shall be corrected.

The length of spread of bituminous material shall not be in excess of that which can be immediately covered with aggregate. The spread of bituminous material shall not be more than 150 mm. wider than the width covered by the aggregate from the spreading equipment. Under no circumstances shall operations proceed in such manner that bituminous material will be allowed to set up, dry or otherwise impair retention of the cover aggregate.

SECTION 4 ASPHALT WORKS

The surfaces of structures and appurtenances adjacent to areas being treated shall be protected in such a manner as to prevent spattering or marring. No bituminous material shall be discharged into gullies.

For Double Aggregate Seal Coats the second application of bituminous material shall be applied with the distributor operated in the opposite direction from the first application.

408.03.5 Applying Aggregate

Immediately following the application of the bituminous material, the specified aggregate shall be spread at the rate designated by the Engineer. Spreading shall be accomplished in such a manner that the tyres of the hauling units or aggregate spreader at no time contact the uncovered and newly applied bituminous material. Junctions of spreads shall be carefully made to assure a smooth riding surface.

The aggregates shall be pre-moistened and mixed with water 24 hours prior to use to eliminate or reduce the dust coating so that they are uniformly damp at the time of use. The Engineer may also require that the aggregates be redampened in the hauling units just prior to delivery to the spreader.

Operating the aggregate spreader at speeds which cause the particles to roll over after striking the bituminous covered surface will not be permitted.

Immediately after the aggregate is spread, any deficient areas shall be covered by additional material. Any piles, ridges or uneven distribution of aggregate shall be carefully removed and corrected to ensure against permanent ridges, bumps or depressions in the completed surface. Additional aggregate shall be spread in whatever quantities necessary to prevent picking up by the rollers or traffic, after which the surface shall be rolled.

Care shall be taken to prevent aggregate from entering gullies and the Contractor will be responsible for cleaning the gullies of any debris caused by his operation.

Initial rolling shall consist of one complete coverage performed with the steel-wheeled roller (5000 to 10000 kg weight) and shall begin immediately behind the spreader. Crushing of aggregates by excessive rolling shall be avoided. Binder and aggregate shall not be spread more than 200 metres ahead of completion of the initial rolling operations. Pneumatic tyred rolling shall begin immediately after completion of the initial rolling and shall be continued until the aggregate is firmly embedded in the binder and in no case shall be less than two complete coverages.

Steel wheeled rollers shall be operated at a maximum speed 5 km/h. Pneumatic-tyred rollers shall be operated at a maximum speed of 8 km/h.

Should the Engineer deem it necessary, supplemental spreading and smoothing by broom drag or hand methods may be required prior to rolling.

408.03.6 Maintenance of the Surface

a. Fog Seal

The Fog Seal shall be protected from traffic for a minimum of two hours after placement. Where required by the Engineer, water shall be sprayed on the surface to reduce tackiness prior to opening the Fog Seal to traffic.

b. All other Seal Coats

The completed surface shall be lightly broomed and otherwise maintained as directed by the Engineer for a minimum period of 5 days. Maintenance of the surface shall include the distribution of additional aggregate over the surface to absorb any free bituminous material and cover any area deficient in aggregate. The maintenance shall be conducted so as not to displace imbedded material. Excess material shall be swept from the entire surface by means of rotary brooms. The surface shall be swept at the time determined by the Engineer. Where double aggregate seal coat is specified the second application shall be made no sooner than 5 days after the first application.

408.03.7 Traffic Control

The Contractor shall at all times provide and maintain satisfactory signs, barricades, barrels, flagmen, warning lights, etc. so as to protect the surface from all types of traffic throughout the maintenance period and as directed by the Engineer. Any damage to the Seal Coat shall be satisfactorily repaired by the Contractor at his own expense.

408.04 CHIP SEAL COAT