Contractor: Toureen Group
Project: Heathrow Terminal 4
City: London, UK
Application: 750-bedroom hotel development
Solution: Concrete Washout System
During construction of a new 750-bedroom hotel development at London Heathrow’s Terminal 4, Conquip worked closely with the Toureen Group to develop a new Concrete Washout system to help manage and reuse concrete wastewater.
The new seven-storey hotel, which is due to open in 2018, will comprise both a 455-bedroom Crowne Plaza and a 300-bedroom Holiday Inn Express and benefit from direct access to Heathrow Terminal 4. The site occupies over 6000 square metres and is part of a long term, multi-site scheme at Heathrow by the Arora Group.
Due to the volumes of concrete being poured on this project, Toureen required an effective system for managing the wastewater created when washing out equipment following a concrete pour. This includes concrete skips, pump lines and delivery vehicles.
Managing concrete wastewater is a challenge as it cannot be safely discharged into the mains sewer or allowed to drain away on site. Due to the presence of calcium hydroxide, the wastewater is alkaline and so even in small quantities can be harmful to the environment. The upper pH limit for water discharged into sewers is pH10 while concrete wastewater typically has a pH of between 11 and 13.6.