Hydraulic lime’s unique properties

Hydraulic lime is a type of lime that possesses unique properties that allow it to set and harden underwater. Here are some key properties that make hydraulic lime useful for underwater applications in Auckland:

  1. Hydraulicity: Hydraulic lime contains a significant amount of silica and alumina impurities, which react with water to form compounds that contribute to its hydraulic properties. These compounds, such as calcium silicates and calcium aluminates, enable the lime to undergo a chemical reaction known as hydration, even in the presence of water. This hydraulicity allows the lime to set and harden underwater.
  1. Setting and Curing: Hydraulic lime sets and cures through a combination of chemical reactions and physical processes. When hydraulic lime comes into contact with water, it undergoes a chemical reaction called hydrolysis, which releases calcium hydroxide (lime) and forms hydrated compounds. These hydrated compounds gradually harden over time, forming a solid and durable matrix.
  1. Flexibility and Breathability: Hydraulic lime has a certain level of flexibility and breathability, allowing it to accommodate slight movements or stresses in the surrounding environment. This flexibility is particularly beneficial in applications where the structure may be subject to water movements, such as in underwater environments or areas with fluctuating water levels. The ability to breathe and release moisture vapor also helps prevent the buildup of moisture and potential damage caused by trapped water.
  1. Durability: Hydraulic lime offers good durability and resistance to weathering, including resistance to freeze-thaw cycles and saltwater environments. This makes it suitable for underwater structures, such as foundations, retaining walls, and submerged structures like marine installations or waterfront constructions.

By virtue of its hydraulicity, hydraulic lime provides an effective solution for construction projects that involve working with or in contact with water in Auckland. Its ability to set and harden underwater, coupled with its flexibility, breathability, and durability, make it a valuable material for achieving long-lasting and resilient structures in aquatic environments.