Construct · 1 fields · 1 citations

carbonation: a standalone construct

One name. One construct. A landmark on the map.

● anchor · a standalone construct Nearest construct by meaning·not indexed
carbonation1 CONSTRUCTConcrete carbonationNEVILLE · pH DROP

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Concrete technology

Atmospheric CO2 reacting with concrete, lowering its pH and risking steel corrosion

In concrete technology carbonation is the slow reaction in which atmospheric carbon dioxide penetrates hardened concrete and reacts with the calcium hydroxide in the pore solution to form calcium carbonate, lowering the pore-water pH from around 13 toward neutral. Neville's Properties of concrete explains that as the carbonation front advances past the cover and reaches the reinforcement, it strips away the alkaline film that protects the steel, allowing corrosion to begin. The referent is a durability-threatening chemical change measured as a carbonation depth over time, unrelated to the deliberate dissolving of gas that gives a drink its fizz.[1]

Unit
Depth of the carbonation front advancing into the cover over time
Recovery means
Not reversed in service; managed by adequate cover depth and low-permeability concrete so the front does not reach the steel
Measured by
Measured as carbonation depth, typically by spraying a phenolphthalein indicator on a fresh break and reading the colour-change boundary

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Nearby constructs

chemesthesis1 fields · 1 citationsanchor · a single construct, one fieldconstruct6 fields · 7 citationsjingle · one name, six constructscover2 fields · 4 citationsjingle · one word, two constructs

References

  1. Neville, A. M. (2011). Properties of concrete (5th ed.). Pearson Education. ISBN 9780273755807

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