Chapter 5. Admixtures

The early chapters described the properties of Portland cement and of a wide range of cementitious materials, as well as of the aggregate used in making concrete, together with a discussion of the influence of these materials and their combinations on the properties of fresh concrete. To a lesser extent, the influence on the properties of hardened concrete was also discussed but, before the latter topic is considered more fully, it is useful to review one more ingredient of the concrete mix: admixtures.

While admixtures, unlike cement, aggregate and water, are not an essential component of the concrete mix, they are an important and increasingly widespread component: in many countries, a mix which contains no admixtures ...

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