Ternary lightweight mortar composition using ready-mixed concrete wash water

Eco-friendly lightweight mortar using ready-mixed concrete wash water and a ternary binder

This technology is a lightweight mortar composition that utilizes a ternary binder—a mixture of cement, ground granulated blast-furnace slag, and fly ash—along with artificial lightweight fine aggregates and ready-mixed concrete wash water as mixing water.

Ready-mixed concrete wash water is typically discarded, creating a significant environmental burden, and there have been challenges in maintaining physical properties such as lightweight characteristics and strength when recycling it as mixing water.

By recycling ready-mixed concrete wash water as mixing water and ensuring performance through the use of a ternary binder and lightweight fine aggregates, this technology can be applied to architectural lightweight mortar to repurpose industrial byproducts and enhance environmental sustainability.

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Key Features:

• 330–360 parts by weight of a binder composed of 80 wt% cement, 5–15 wt% ground granulated blast-furnace slag, and 5–15 wt% fly ash
• 200–320 parts by weight of fine aggregate, containing at least 50 vol% artificial lightweight fine aggregate to provide lightweight properties
• 160–180 parts by weight of ready-mixed concrete wash water containing at least 35 wt% CaO and having a solids content of 7.5–10.0 wt%
• A lightweight mortar composition formulated to achieve a unit weight of less than 2,200 kg/m³ and a 28-day compressive strength of 45 MPa or higher

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