Specifications and additional Information - Boral

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Hydrapave Permeable Paving BOOK 3 PAGE F6 The water harvested from tanked Hydrapave systems can generally be used for non-potable purposes such as flushing lavatories, irrigation of lawns and plants. Testing should be carried out after installation to ensure that appropriate water quality will be discharged. Roof Water Roof water from typical domestic residences can be discharged directly onto the Hydrapave surface or into the sub-base. Roof runoff from large industrial buildings should be introduced into the sub-base by means of a sump with a manhole cover adjacent to the paved area. Any roof litter, leaves etc., contained in the runoff can be easily caught and cleared in the manhole. Tree Soil The Hydrapave system has been widely used in conjunction with load bearing tree soil. This enables hard surfacing to be used right up to tree pits without being detrimental to the trees. Soil respiration and moisture availability are key elements in the successful establishment and future growth of trees. With other hard surface paving systems, the only access for air and water has been through the tree grill or irrigation system. However, with the use of permeable paving blocks, soil respiration is dramatically improved and natural rainfall is made available to the tree in a way that was previously not possible. Long-term Performance Extensive research on the siltation of blocks and laying course undertaken at the University of South Australia has verified the long-term performance of the Hydrapave system. This research assumed rainfall of 580mm per annum with a loading of 200 parts per million of sediments (this loading corresponds to that of an established urban catchment). The results concluded that even after a thirty five year service life, the permeability of the system was reduced to approximately 800mm/hour, due to the siltation of the filter fabric, a value still greater than the design storm intensity used anywhere in Australia. This research has shown that over 90% of the surface permeability of the paving can be lost through silting, and the system will still perform to twice the greatest design storm intensity used in Australia. (Darwin 400mm/hr). Salt Tested Boral Hydrapave Pavers have been tested to AS/NZS4456.10 and can be used in saline environments. Boral recommends applying an appropriate penetrative sealer to further safeguard against saline effects in salt pool surround applications and other constant saline environments. Colour and Finish Variation Hydrapave pavers are manufactured from naturally occurring materials and consequently may show slight variations in finish and colour. It is strongly recommended that products are taken from two or more packs and mixed during laying to minimise noticeable colour variations. All concrete products may suffer from efflorescence. This occurs naturally and will disappear with use. It is in no way detrimental to the performance of the product. No responsibility can be accepted for this natural reaction. Scheduled Maintenance Hydrapave pavers have a design life equivalent to other Boral concrete pavers. The surface of pavers should be brushed at least twice a year with a mechanical suction brush. It is recommended that this should be carried out in the spring and after leaf fall in autumn. Rehabilitation Access to services in or underneath the Hydrapave system must be undertaken in a disciplined and progressive way. Detailed procedures for lift and rehabilitation are available from your Boral representative. Ultimately, perhaps after 25 years or more, areas of the laying course may become filled with silts and toxins. If this occurs the surface pavers should be lifted and the affected areas of laying-course material and filter fabric disposed of. The existing sub-base can be left in situ. Fresh filter fabric and laying course stone should be installed and the existing surface pavers re-used.
Hydrapave Construction Guidelines Preparation All construction work on pavements should be carried out following completion of general site works and after topsoiling of adjacent areas to prevent wash down of fine materials. Sub-grade Excavate to sub-grade levels shown on site drawings to provide a minimum fall of 1:1000 to strip drain. Where it is proposed to infiltrate, no falls or strip drains are necessary. The subgrade should be compacted with a vibrating plate or roller to the requirements of the specification. Prior to compaction all soft areas should be removed and filled with suitable replacement material to provide a stable subgrade. Kerbs The paved areas must be firmly restrained with kerbs and kerb haunching designed to suit the intended use. Membrane For tanked systems, lay membrane taking care to overlap the joints by 300mm using double-sided tape. Where methane or a high water table is present, a specialist heavyduty membrane may be required, and the joints should be welded. Where the sub-grade is rough, a layer of sand and/or geotextile may be required to protect the membrane. A filter fabric layer can be placed over the membrane to protect against puncture damage from the sub-base. If it is proposed to drain by infiltration to the sub-grade, use a filter fabric (instead of membrane) to stop the ingress of sub-grade material into the sub-base. Sub-base The sub-base is comprised of two layers with a total nominal thickness of 350mm. The specified 350mm thickness of sub-base may be varied by the project engineer to suit site requirements. The upper sub-base is a layer of 20 — 5mm stone up to 100mm thick. The lower layer is to be (63 — 10mm) stone up to 250mm thick. The lower layer of sub-base should be placed in two separate layers, each layer being compacted with a vibrating roller or heavy-duty vibrating plate. Compaction should continue until 95% of the compacted bulk density achievable under laboratory conditions has been reached. Filter Fabric Hydrapave Permeable Paving BOOK 3 PAGE F7 Lay filter fabric on top of the sub-base overlapping joints by 300mm. Bedding Course Lay and loose screed 5mm single sized crushed stone to approximately 50mm depth. It is important that the final level of the 5mm stone is accurate, as the stone will compact down much less than sand would when the pavers are vibrated. The particle shape of the 5mm stone will also affect the degree of compaction. A small trial area should be laid prior to construction to determine the accuracy of final levels. Paver Laying Hydrapave pavers must be laid in a 90° herringbone pattern, tightly butt jointed to ensure that a close fit is achieved. A single header course or double stretcher course of Hydrapave pavers must be used around the perimeter of the paved areas and also at the edges of any separately restrained areas, such as tree pits. It is strongly recommended that products are taken from two or more packs and mixed during laying to minimise noticeable colour variations. Where pavers need cutting, they should be cut to a tight fit and none are to be smaller than 30% of the paver size. Where Hydrapave pavers are cut they must be cut across the 110mm and not the 220mm dimension. Pavers should be cut vertically and not underscored. All paver cutting should be carried out with a disc cutter. Occupational, health and safety requirements should be observed at all times. Paver Compaction The pavers should be vibrated with a high-frequency, lowamplitude vibrating plate compactor, over carpet or similar to prevent marking the paver surface. Following the first pass with a vibrating plate, spread a light dressing of 3mm single size clean stone at the rate of approximately 1 - 2 kg/m 2 over the surface and brush into the joints. The pavers should again be vibrated and any debris brushed off.
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Specifications and additional Information - Boral

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