Wind is a clean source of renewable energy, with minimal operational costs once a turbine is erected. Technological advances, and production process improvements, are reducing the construction costs for wind turbines and farms. Hence the increasing number of farms around the globe.
By the nature of their operation, wind farms must be positioned in extremely exposed regions, where unimpeded, consistent, robust breezes can be guaranteed. On-shore farms are typically constructed with a very heavy concrete base, which must have the strength to withstand the constant force, and leverage, on the turbine tower.
Not your average concrete construction.
The massive bases typically require in excess of 500 m3 of concrete each. Mix design is obviously crucial, with high GP cement content and other additives to achieve minimum permeability.
Critically, curing will play a vital role in the long-term strength of the concrete.
Specific curing challenges
The exposed conditions of the construction mean that ambient winds can hasten surface evaporation, with a negative impact on hydration quality. Excess evaporation means an increase in shrinkage cracking and bleedwater porosity, setting the scene for premature deterioration of the concrete itself.
Further, the sheer bulk of the bases may cause high heat of hydration within the slab while curing. This temperature differential between the surface and core concrete can result in uneven curing and loss of overall strength.
Extra protection needed!
We’d like to introduce a couple of advanced treatments, for protecting the concrete and enhancing the curing process.
1. Enhance strength and durability
AQURON 300 concrete hydrogel admixture has a number of direct benefits for wind farm bases.
- Waterproofing – effectively preventing ingress and migration of moisture and reactants.
- Heat of hydration control – optimising hydration controls hydration heat and assists large-mass pours.
- Strength enhancement.
- Self-healing non-moving cracks up to 0.5mm.
2. Enhance curing
AQURON 1000 concrete hydrogel treatment is an excellent curing enhancement, equal or superior to 14 days’ water curing. And there are permanent benefits: the concrete porosity is sealed, and the slab hardened to a depth of 150mm, giving long-term durability.
Not only for wind farms!
Keep in mind that these are valid and practical solutions for a range of civil construction projects in exposed locations.
The Markham team has accumulated years of experience in a very wide array of project types, and we’d love to talk to you about your project! Why not get in touch today?