Cement is playing an increasingly important part in geotechnical engineering; a branch of engineering concerned with the behaviour of earth materials. Geotechnical engineering is a vital consideration in any form of construction in the ground and Tarmac has developed a range of high-performance products with specially formulated characteristics that are well suited for a wide variety of geotechnical applications.
Reduced vehicle movements, landfill tax benefits and reduced need for importation of virgin aggregate
Minimized site preparation, tipping and importing of materials
Eliminates need to import materials like sub-base
Less Environmental Impact
No need to remove inappropriate materials or to import virgin aggregates and reduces scale of construction activities, congestion and neighbourhood conflict
Avoidance of landfill tax
By improving the soil already on site, ‘dig and dump’ is virtually eliminated
Ferrocrete® – CEM I 52,5
Finely ground Portland cement with high early strength development that facilitates early demoulding, handling and use of precast units.
Portland cement – CEM I 52,5
Consistent, good early strength conforming to BS EN 197-1. Compatible with admixtures, additions and pigments.
Phoenix® – CEM II/B-V 42,5N
Factory produced Portland-fly ash cement with target ash content of 27% and lower embodied CO2 than Portland cement. Moderately low heat, reduces risk of early-age thermal cracking and risk of attack on concrete in aggressive ground.
Fine cement, combining high fineness with good early strength development. Especially formulated for the use in cement-based adhesives, repair compounds, flowing screeds and grouts.
Superfine cement, combining high fineness with good early strength development. Especially formulated for injection into joints, cracks, fissures and soils to produce a water-tight mass of grouted rock or soil.
Ultrafine cement, combining high fineness with good early strength development. Especially formulated for geotechnical applications and injection into hard rock, tight joints and fissures.
THE IMPORTANCE OF CEMENT & LIME BASED GEOTECHNICAL SOLUTIONS
Cement and lime play an important role in geotechnically improving areas of weak soil for all forms of construction within the UK, and are endorsed by the Highways Agency. Rising landfill cost have made soil stabilization an increasingly important and desirable option.
Both in situ and precast piling systems provide fast and effective foundation solutions. In situ piles can be varied to suit ground conditions, and using cement with high early strength properties and increased sulfate resistance enhances speed of installation and durability. Large diameters and long pile lengths can be achieved. Precast concrete piles suit all applications and ground conditions, and are highly cost effective – quick to install, no spoil, and reduced waste disposal costs.
Deep foundations are required where there are large design loads and poor soil conditions at shallow depth, or other site constraints such as boundary lines. Using cement with a high ash or slag content reduces risk of sulfate attack and alkali-silica reaction, and increases durability in aggressive ground conditions.
The most cost-effective retaining solution providing strong soil and hydraulic support. Diaphragm walls are especially relevant where watertightness and a stiff retaining structure are needed to control and protect the surrounding environment against settlement, and for water blocking. Using cement with fly ash or slag content increases the durability in aggressive ground conditions of reinforced concrete waterblocking diaphragm walls close to open water, where the ground water table is high, or where there are surrounding tunnels and open cuts.
Sprayed concrete – Cement with good admixture reactivity and consistent quality produces sprayable, high-performing concrete, which is ideal for the tunnel lining. Injection grouting – Ultrafine cements with narrow particle size distribution produce fast-setting mixes that can be injected to seal and strengthen the bedrock and control the flow of underground water.
Repair – Microfine cements are specially engineered to produce concrete for repair of damaged areas, tunnel segments, and to protect steel reinforcement in precast concrete segments.