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Outline Multilayer Construction

Scope
This document sets out the general description of and information regarding construction of tennis courts, using granular structural base materials, and asphalt concrete (hot-mix) surfacing.

Material Description

Subgrade: Clean granular material, free from organic and vegetable matter.
Granular Base: Clean, well graded, material free from deleterious, friable and/or organic contaminants. It shall conform with MRD or other local grading requirements for Crushed Rock Base.
Asphaltic Concrete: Plant mixed hot laid material of maximum aggregate size 7mm as specified, and conforming to the physical requirements for Marshall design stability, flow, grading and composition.

Kerbing

Pre, or in situ cast concrete
steel
treated wood
brick
other approved.

Fencing
Plastic coated chain link mesh supported on galvanised steel, or powder coated steel fence posts, with or without rails, and with suitable braces, gates and other openings.

Lighting
Follow manufacturers specification.

Court Furniture
Suitable circular or square section steel tubular posts cast into footings as detailed on the plans. Including internal or external tensioning equipment for the adjustment of net height.

Construction
General Level requirements All excavating, filling, compacting, grading and levelling work shall be carried out to produce finished court surfaces with a slope of 1.0% on a flat plane from side to side, end to end, or diagonally from corner to corner, as indicated on drawings.

Tolerances

3m. Straightedge Level
Subgrade 25mm +0-25
Base 7mm +/-10
Asphalt 4mm N/A

Subgrade
The site shall be cleared, prepared and trimmed to design levels. The surface shall be compacted using suitable compaction equipment to achieve a density of no less than 95% MDD.

Granular Base
Spreading
The material shall be spread on the prepared subgrade by an approved method to ensure minimum disturbance of the subgrade. The material shall be spread to a layer of uniform thickness, within design thickness tolerances. It shall be maintained at a suitable moisture content to ensure required density is attained upon compaction.

Compaction
The levelled base course layer shall be compacted with suitable compaction equipment to achieve uniform and adequate compacted density of the finished layer. Surface texture shall be uniform, well bound and with no laitance.

Kerbing
Kerb should generally surround the entire surface, but may be varied to conform to site requirements. Kerb may be installed at finished surface level or upstanding from the surface, depending on the disposal method for surface water drainage. If kerbing is not to be used the asphalt surface is to extend a minimum of 150mm beyond the fence line in all directions, and is to be finished neatly in straight lines

Asphalt Surface Course

Equipment: The asphalt surface course shall be spread my means of a self propelled paving machine, designed top be self levelling, and with a vibratory screed or tampers The equipment used shall also include a power broom or a power blower, or both; a self-propelled, pneumatic-tyre roller, or steel-wheeled tandem (3 to 5 tons) or both. Pneumatic-tyred rollers shall have a total compacting width of not less than 1500mm. The operating contact pressure will be specified by the engineer.
Materials: The mineral aggregate shall consist of crushed rock, crushed slag, or crushed gravel. It shall be of uniform quality throughout and it shall be clean. Not less than (60) percent by weight of crushed gravel shall consist of crushed pieces having two or more faces produced by fracture. The surface course shall consist of a layer of >25mm compacted thickness of asphalt concrete wearing course of maximum aggregate size 9mm. The composition of the mixed material shall be properly designed and shall comprise carefully controlled proportions of an appropriate grade of residual bitumen and mineral aggregates, sands and fillers. Mixed material shall be delivered to the laying site at a temperature between 150 – 170 deg C. The finished, compacted layer will display suitable stability and performance characteristics.
Installation: Application of liquid bitumen tack coats (other than emulsified bitumen) shall be made only when the surface is thoroughly dry. Application of cationic bitumen emulsion may be made when the surface is dry or slightly damp. Anionic bitumen emulsion may not be used when the surface is damp or rain threatening. Unless otherwise permitted by the engineer, asphaltic binder shall be applied only when the pavement temperature is not less than 250C Spreading of the asphalt concrete shall not commence until the tack coat is dry enough to traversed without undue displacement by truck tires etc. Asphalt temperature shall be >1400C at the time of commencement of laying. The direction of laying shall be predetermined to take account of access to and egress from the site, surface falls of the paved area, and any other factors of importance, e.g. position of fixed court furniture, lighting etc.
Rolling: Immediately after spreading, the asphalt layer it shall be rolled with a self-propelled pneumatic-tyred or steel-wheeled tandem roller, or both. Rolling shall proceed in a longitudinal direction, following good rolling practice Each trip shall overlap the previous trip by about one-half the width of the front wheels or roll. The first rolling shall be completed within one-half hour after the asphalt has been spread. Rolling shall continue only until a smooth, thoroughly compacted surface is obtained. Cross rolling shall be carried out at the discretion of the supervisor. The surface shall not be over-rolled and no roller surface cracking shall be tolerated. Special attention shall be paid to paver machine joints and constant checking shall be carried out during laying and rolling to ensure no depressions or ridges develop. Corrective action and modification of technique shall be made immediately , until the problem is rectified.

Synthetic Surface
The installation of synthetic surfacing shall not commence until after the elapse of 21 days curing period for the asphalt sub surface

NB: This outline specification is merely a guide for Engineers, Architects builders etc. There are many more facets to be considered, and prior to commencement of any construction the advice of professional designers/court builders should be sought.