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Protection of Concrete: Proceedings of the International by Ravindra K. Dhir, Jeffrey W. Green

By Ravindra K. Dhir, Jeffrey W. Green

Concrete is arguably the foremost building fabric used around the globe. It has mostly served good, but too frequently it has didn't in achieving the necessary functionality. even if advancements in fabrics and perform have widened the scope for using concrete, they've got additionally had results on its functionality. This e-book offers present pondering and destiny advancements on technique of keeping concrete and making sure its sufficient functionality within the required software.

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Extra resources for Protection of Concrete: Proceedings of the International Conference, University of Dundee, September 1990

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We must however keep in mind that these data are true only for very well cured mortar and cement skins. Figure 12: Estimation of properties of mortar skin. So for the formation of the concrete skin the velocity of drying and thermal shrinkage are important as well as the distance to which these phenomena penetrate the concrete. Joisel (1968) calculated the penetration depths, resulting in Figure 13. 6 t (xs in cm, t in days). Consequently for the same time of exposure the depth reached by thermal shrinkage is some 125 times greater than that reached by drying shrinkage.

Some 10% of the circumference of aggregate particles ≥1mm in size, is cracked after about 24 hours. During loading mortar cracks are formed, which connect the adhesion cracks. Such micro cracks are the cause of the shape of the stress-strain curve illustrated in Figure 5. Figure 5: Stress—strain diagram of concrete. 4 Porosity of Concrete Apart from the macro pores in the concrete—some 1–3% after mixing—the porosity of concrete is determined by the porosity of the cement paste and that of the aggregates.

Protection from Impact There are numerous examples of concrete structures specifically designed to provide protection from impact. Any shortlist would include railings, balustrades, motorway crash-barriers, and casings around bridge columns to protect them from impact damage. The Tjorn bridge disaster in Sweden in 1980, in which a ship collided with a bridge pier, causing its collapse, dramatically highlighted the vulnerability of such structures to impact and the value of wide protective bases—even though the remedy in that particular case was to build a suspension bridge with a long span, with its support towers on dry land, instead of having piers in the water.

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