Stratification of concrete
In relation to concrete, the term 'stratification' refers to the formation of horizontal, layered lines that can sometimes be found in cured cast-in-place concrete. This is the result of the pouring of successive concrete batches that may differ slightly in appearance.
Stratification generally only occurs in wetter concrete, rather than those that are of medium or drier consistencies. Concrete that is over-wet or over-vibrated can separate into horizontal layers, with the lighter material tending to form towards the top, and heavier material moving towards the bottom. This can have a detrimental effect on the durability of the concrete.
To remedy stratification, the concrete can be re-vibrated, as long as the concrete has not become stiff to the point where plasticity will not be restored after re-vibration.
[edit] Related articles on Designing Buildings
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
Connect, collaborate, shape the future
Registration now live for UK Construction Week Birmingham.
CIOB announces Saul Humphrey FCIOB as new President for 26/27 term.
A quick, simple, and zero-bills solution to prevent overheating.
The adaptive reuse of large industrial structures.
Promoting the circular economy by extending the life of buildings.
CIAT responds to Climate Change Committee report
An urgent wake-up call for both government and the built environment.
Construction Management, 24 June
FMB pilot aims to build pipeline of site-ready tradespeople.
A quick introduction.
CLC publishes Mental Health Joint Code of Practice.
A quick introduction to its uses and risks.
Construction Management, 17 June
Government rolls out digital planning tool to all local authorities.
Your views needed - a strategy for the professions, trades and occupations.
Confronting competency, codes, capacity and costs.