sentence: Pigments can change the dull grey colour.
sentences_before: Superplasticizers' are chemicals which improve workability, which means the ability to shape the concrete before it has set.
sentences_after: Air entrainment' is blowing little bubbles in the concrete before it sets. This helps the concrete survive the freezing and thawing of a cold climate. Blast furnace slag can be mixed with concrete. It turns the colour into almost pure white and makes the concrete stronger.
concept_name: pigment
headings: Concrete Additives
categories: Building materials