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 and news
Understanding is key to conservation.
Open industry engagement survey seeks responses
Institutions and the importance of engagement.
National Retrofit Hub unveils new guide
Digital Building Logbooks and Retrofit: An Introduction.
Top 50 firms awarded 52bn of projects in the last year
New engineering data shows.
Enhancing construction site reporting efficiency
Through digitisation and the digital revolution.
Noise in the built environment
BSRIA guide TG 20/2021.
17,000 people suffer conditions as a result of exposure to excessive noise at work.
Turning down the noise: Auditory health
A pervasive risk with far-reaching consequences.
Getting the most out of heat pumps and heating
How heat pumps work and how they work best.
Plumbing and heating for successful retrofit and renovation
Low temperature underfloor systems and heat pumps.
Cost-of-living crisis and home improvement plans
Starting on the right footing and top tips for projects.
Delays on construction projects
Types, mitigation and the acceleration of works.
From Chaucer to Fawlty Towers.
Electrotechnical excellence, now open for entries.
Net zero electricity grids BSRIA guide NZG 5/2024
Outlining the changes needed to transition to net zero.
CIOB Global Student Challenge 2024
Universitas Indonesia wins for second year running.