Curing Concrete

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Essential for Good Concrete

Curing concrete Curing is one of the most important steps in concrete construction, because proper curing greatly increases concrete strength and durability. Effects of temperature on concrete Temperature extremes make it difficult to properly place, finish and cure concrete.

Adding air to concrete to help when it freezes Air-entrained concrete contains billions of microscopic air cells per cubic metre. Concrete can harden under water Portland cement is a hydraulic cement which means that it sets and hardens due to a chemical reaction with water.

The Difference Between Curing and Drying Concrete

Consequently, it will harden under water. Please note Java is different and is not required. Please follow these instructions to enable it in your browser.

Plastic shrinkage and settlement cracking in concrete

Portland cement is a hydraulic cement which means that it sets and hardens due to a chemical reaction with water. It has only one connecting cable.

The Difference Between Curing and Drying Concrete

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Quick and simple Contact us with queries. Figure 1 shows an image taken using a scanning electron microscope of a polished section of a piece of a core taken from a UK road bridge constructed in the s. The top of the concrete in the image is the original surface of the concrete.

Clearly, some hydration had occurred near the surface after placing, but the concrete surface was allowed to dry prematurely. At depths greater than about 1 mm, the cement hydrated normally, resulting in a dense paste, but cement hydration in the top millimetre or so stopped due to lack of water, with the pores representing the spaces occupied by the water before it evaporated. What I think is of particular interest is that cement hydration did not resume in the intervening years.

Poor concrete curing - an example

The concrete surface would have been exposed to rain and spray from vehicles but despite this, the thin dense rims of hydration product around the cement were evidently sufficiently impermeable to prevent further hydration. The porous surface seems to have had no adverse consequences for this particular concrete and would have been of no structural significance in this instance. However, porous surface regions of concrete are prone to damage generally and by abrasion or frost action in particular, producing an unsightly appearance. Where aesthetics are important, decorative concrete for example, any such damage would probably be unacceptable.

Curing Concrete Test Specimens