Calcium oxide, calcium hydroxide and calcium carbonate products are used for various construction related purposes including masonry, stuccos and plasters, autoclaved aerated concrete, concrete products, calcium silicate brick, insulation materials and roofing products. Mississippi Lime’s product line for these applications include: Standard Hydrated Lime, Standard Quicklime, Architectural Lime Putty, and CalCarb®
M2 Asphalt Mineral Filler.
Masonry mortars, stuccos, and plasters have used high calcium quicklime and hydrated lime as primary ingredients for centuries. This important use continues to the present day in both historic and contemporary applications. Mortars made with lime and cement exhibit superior workability balanced with appropriate compressive strength, as well as low water permeability and superior bond strength. Lime is a major constituent in exterior and interior stuccos and plasters, enhancing the strength, durability, and workability of these finishes. All of these lime applications are supported by ASTM specifications and standards.
For more information on the use of hydrated lime in masonry applications, see (1) Fact Sheet: Hydrated Lime for Masonry Purposes
Autoclaved Aerated Concrete (AAC) employs lime in the manufacture of innovative lightweight cellular concrete products (also called “aircrete”), which can be formed into blocks as well as large masonry units or insulation slabs. Block and other concrete products use hydrated lime in order to produce a denser, more water-resistant product. By adding greater plasticity to the mix, hydrated lime also produces concrete products with more precise edges and corners, improves reflectivity, and reduces loss through breakage.
Calcium Silicate Brick manufacture uses lime as a key raw material. Calcium silicate (sand-lime) brick is employed in standard masonry construction in the same manner as common clay brick. Sand is mixed with high calcium lime (quick or hydrated) in a wet state, and then molded into bricks and autoclaved. The lime reacts with silica to form complex hydro(di)calcium silicates that bind the brick and provide high dimensional stability. Lime is also used to make hollow sand-lime building block, tile, slabs, and pipe.
Insulation Materials, such as molded units, contain lime with either diatomaceous earth or silica. In these products, lime serves as a binding agent, reacting chemically with the available silica present in the mix to form calcium silicates. The lime-silica reaction is also employed in making microporite insulation. Roofing shingles use limestone as filler in the bitumen.