Eco-friendly mortar composition using blast furnace slag fine aggregate and ready-mixed concrete wash water

Eco-friendly mortar using blast furnace slag fine aggregate and ready-mixed concrete wash water

This technology is an eco-friendly mortar composition that incorporates blast furnace slag fine aggregate into cement and natural fine aggregate, using mixing water containing solids obtained from ready-mixed concrete wash water.

Ready-mixed concrete wash water and blast furnace slag fine aggregate are industrial by-products that pose a significant disposal burden, and there have been difficulties in ensuring reactivity and strength when using them together.

This technology allows the solids from ready-mixed concrete wash water to accelerate the reactivity of the blast furnace slag fine aggregate, inducing densification and crystal formation. When applied to construction mortar, it enables the recycling of industrial by-products and enhances eco-friendliness.

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Key Features:

• Mortar composition containing 330–360 parts by weight of cement, 80–320 parts by weight of fine aggregate, and 160–180 parts by weight of mixing water
• Fine aggregate for mortar composed of 60–90 vol% natural fine aggregate and 10–40 vol% blast furnace slag fine aggregate
• Industrial by-product blast furnace slag fine aggregate with a particle size of 5 mm or less, a fineness modulus of 2.3–3.1, and a specific gravity of 2.5–2.8 g/cm³
• Mixing water that promotes reactivity by containing 5.0–10.0 wt% of solids obtained from ready-mixed concrete wash water, with a CaO content of 35 wt% or more

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