Structural Drainage
INTRODUCTION
Control of water infiltration and providing adequate drainage are critical to the performance of substructures. Traditional practice specifies the use of a 300-600mm thick porous backfill with geotextile filter. ALFDRAIN geocomposites are more cost – and time-effective solutions with comparable or superior drainage capability to aggregate drainage layers.
ALFDRAIN high performance geocomposites are engineered to provide high water drainage capacity. Excellent compressive strength and resistance to creep ensures that it maintains its drainage capability under a wide range of compressive loads.
INTRODUCTION
Control of water infiltration and providing adequate drainage are critical to the performance of substructures. Traditional practice specifies the use of a 300-600mm thick porous backfill with geotextile filter. ALFDRAIN geocomposites are more cost – and time-effective solutions with comparable or superior drainage capability to aggregate drainage layers.
ALFDRAIN high performance geocomposites are engineered to provide high water drainage capacity. Excellent compressive strength and resistance to creep ensures that it maintains its drainage capability under a wide range of compressive loads.
GEOCOMPOSITE REQUIREMENTS
ALFDRAIN geocomposites provide significant cost savings and a dramatic carbon footprint reduction.
PERFORMANCE COMPARISON
| ALFDRAIN | AGGREGATE DRAINAGE |
|---|---|
| Provides superior or equal avenue for drainage of water at different gradients | Drainage capacity dependent upon thickness and gradation of rock |
| Provides additional protection to the waterproof membrane | Aggregate is very aggressive and may damage the waterproof membrane |
| Quick and easy to install for all kind of gradients and conditions | Time consuming installation, difficult to install in vertical drainage |
| Acts as additional moisture barrier | No additional benefits |
| Acts as a barrier against gasses like radon & methane | No additional benefits |
| Low logistic cost and footprint on infrastructure | High logistic cost and footprint on infrastructure |
| Very high flow to thickness ratio | Low flow to thickness ratio |
VERTICAL DRAIN
ALFDRAIN geocomposites are used as vertical drains against buried concrete structures and provide a cost effective replacement to traditional aggregate drainage. ALFDRAIN provides superior drainage and reduced environmental impact due to reduced traffic movements and quarrying when compared to a traditional design.
Retaining walls
Bridge/wall abutments
Underground reservoirs
Tunnels
VERTICAL DRAIN
ALFDRAIN geocomposites are used as vertical drains against buried concrete structures and provide a cost effective replacement to traditional aggregate drainage. ALFDRAIN provides superior drainage and reduced environmental impact due to reduced traffic movements and quarrying when compared to a traditional design.
Retaining walls
Bridge/wall abutments
Underground reservoirs
Tunnels
HORIZONTAL DRAINAGE UNDER MEDIUM LOADS
ALFDRAIN geocomposites are used horizontally below structures to provide lateral drainage.
Our ALFDRAIN S range of cuspate composites provide an effective replacement for traditional aggregate drainage for structures including underground reservoirs, tunnels etc.They have an excellent flow capacity and are optimised for strength and long term performance.
PROTECTION + DRAIN OF WATERPROOF MEMBRANES
ALFDRAIN PD6-225 performs dual functions of:
Protection of waterproof membranes
Drainage of water thereby relieving hydraulic load on the waterproofing system.
ADVANTAGES
The advantages ALFDRAIN PD6-225 brings as an alternative to protection boards are significant.
- Multi-functional solution offering both protection and drainage
- Act as secondary waterproofing by reducing hydrostatic pressures
- Higher puncture resistance
- Highly flexible for the ease of installation
- High resistance against chemicals
- Act as barrier against gases like Radon and Methane
- Compatible with all waterproofing system
PROTECTION + DRAIN OF WATERPROOF MEMBRANES
ALFDRAIN PD6-225 performs dual functions of:
ADVANTAGES
The advantages ALFDRAIN PD6-225 brings as an alternative to protection boards are significant.
- Multi-functional solution offering both protection and drainage
- Act as secondary waterproofing by reducing hydrostatic pressures
- Higher puncture resistance
- Highly flexible for the ease of installation
- High resistance against chemicals
- Act as barrier against gases like Radon and Methane
- Compatible with all waterproofing system
HORIZONTAL DRAINAGE UNDER HEAVY STRUCTURES
Horizontal drainage underneath concrete tanks, tunnels, landfills, heapleach pads, etc., in order to drain water as well as relieve uplift hydraulic pressures.
High performance drainage composites with a crush resistant Biplanar and Triplanar core thermally laminated online onto a purpose designed filter fabric.
All net composites have a compressive strength >1500kPa and a service life durability in excess of 100 years
Testimonials
ALFDRAIN CAVITY FORMER
Cost-effective, efficient and easy way to install cavity for draining leaks and seepages in substructures and basements.
ALFDRAIN CAVITY FORMER separates the internal structure and finishes from the external structure. It can be installed between external and internal walls thereby providing an avenue for collecting seepages and dampness from the external wall and guides it to appropriate drainage channels and collection sumps.
ALFDRAIN CAVITY FORMER can also be installed under flooring in areas of high ground water table before installing tiles or any other finishing. The dimples are filled with mortar providing a smooth surface and a cavity between ground or substrate and floor finishing.
ALFDRAIN CAVITY FORMER qualifies as part of TYPE C waterproofing (Drained Protection) as per BS 8102:2009. It can also be part of combination waterproofing such as Type A and Type C or Type B and Type C waterproofing.
APPLICATION AREAS
- New underground structures
- New basements
- Car parks
- Retaining walls
- Refurbishment of old basements
- Storage rooms requiring excellent moisture and water management
- Semi basements
APPLICATION AREAS
- New underground structures
- New basements
- Car parks
- Retaining walls
- Refurbishment of old basements
- Storage rooms requiring excellent moisture and water management
- Semi basements