Britannica
Sources used in this answer
Why are polymeric lubricant films used between beams and columns in prestressed concrete structures?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
lubrication
Motor oil, a lubricant for automobile engines.
Polymeric lubricant films are utilized in prestressed concrete structures primarily to facilitate the necessary thermal movement of structural members.
When beams rest atop columns, they undergo expansion and contraction due to temperature changes. By placing plates of polymeric film—often 1/2-inch (1.3-centimetre) thick—between these components, the structure can accommodate this movement effectively. A key advantage of these synthetic films, such as polytetrafluoroethylene, is their high resistance to deterioration when exposed to the elements, ensuring the longevity and reliability of the connection.1