Caltite Self‑Compacting Concrete
Rehabilitating & Waterproofing the Structure
The basement of a building at an education facility was deteriorated by soil water which caused sever water leakage from the basement floor and walls. To rehabilitate the basement, a special “waterproof” concrete mix was required.
Project Overview
| Caltite concrete is a waterproofed concrete which reduces capillary water absorption as well as reduces permeability to water under pressure. Such properties allow waterproof concrete to be used in water-resisting construction below ground in place of water-proofing membranes. The particular mix design has not been used before in Saudi Arabia. |
Project Requirements:
- Target strength: 40 MPa @ 28 days
- High waterproofing properties: water absorption, according to BS 1881:122, less than 1%
- W/cm ratio: 0.35-0.40
- Wall jacketing, thickness around 15 cm
Challenges:
- Concrete floors and walls should be impervious to stop any ground water ingress
- Very thin reinforced sections with limited pouring points
- Very difficult to vibrate and compact of the placed concrete, especially in the walls
- Many openings, connections and pipes in the existing walls
- Difficult to reach by a mobile pump inside the existing basements
Solutions:
- Caltite (waterproofing admixture) was used in the mix design to meet the strict waterproofing requirements.
- Self-compacting concrete (SCC) with a 700 mm flow was the solution for pouring the very thin wall section without vibrators.
- The self-compacting concrete also acted as a self-leveling concrete for the basement floors to ensure easier and faster placing.
- Extension pipeline systems were used to deliver concrete from the mobile pumps to the basement.
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