Bleeding

Definition

The flow of mixing water within, or its emergence from, newly placed concrete or mortar; caused by the settlement of the solid materials within the mass; also called water gain.

Purpose

Bleeding is an important consideration in concrete work, as it affects the final strength and durability of the concrete. Proper management of bleeding is necessary to ensure a uniform mix and to prevent surface defects.

Examples of Use

• Observing bleeding in freshly poured concrete on a construction site and adjusting the mix to reduce excess water.
• Managing bleeding in mortar during masonry work to ensure a strong bond between bricks or stones.
• Addressing bleeding in concrete slabs to prevent surface imperfections and ensure a smooth finish.

Related Terms

• Settlement: The downward movement of solid particles in a suspension, leading to the separation of water from the mix.
• Water Gain: Another term for bleeding, emphasizing the appearance of excess water on the surface of the concrete or mortar.
• Concrete Curing: The process of maintaining adequate moisture, temperature, and time to allow concrete to achieve its desired properties.

Notes

Controlling the water-cement ratio and using proper curing techniques can help minimize bleeding. Additionally, using admixtures can enhance the properties of the concrete mix and reduce bleeding.