By Pierre-Claude Aitcin
An entire overview of the fast-developing subject of excessive functionality concrete (HPC) through one of many top researchers within the box. It covers all facets of HPC from fabrics, homes and know-how, to development and trying out. The publication might be worthy for all concrete technologists and development engineers wishing to exploit the extraordinary homes of the cloth.
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A whole assessment of the fast-developing subject of excessive functionality concrete (HPC) by way of one of many prime researchers within the box. It covers all points of HPC from fabrics, homes and expertise, to building and trying out. The ebook should be beneficial for all concrete technologists and development engineers wishing to use the impressive homes of the cloth.
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Extra resources for High-performance concrete
In Chapter 4, the rationale for high-performance concrete is developed, followed by a presentation, in some detail, of 11 case studies. Why should an owner, why should a designer, why should a concrete producer become interested in high-performance concrete? What are the technical and economic advantages of specifying a high-performance concrete? There is 8 Introduction no unique answer. The 11 case studies selected show that highperformance concrete was selected to build both outstanding structures and some modest ones because it was found, for various reasons, that the use of high-performance concrete could achieve the most economical and durable structure under the circumstances.
Controversy reigns at the moment concerning the factors governing the freeze-thaw resistance of high-performance concrete. Some researchers claim that high-performance concrete does not have good freeze-thaw resistance unless air-entrained, others maintain the opposite. We now know that even high compressive strength (>80 MPa) is not a reliable criterion for judging internal microcracking due to repeated cycles of freezing and thawing when Procedure A (freezing and thawing in water) of the ASTM C666 rapid freeze-thaw testing method is used.
During this exercise it will be possible to perform a rehearsal and to be sure that on D-day everybody will know exactly what do to, how to do it and when to do it. During the preconstruction meeting and the prequalification test programme, the testing methods should be reviewed carefully, as well as the methods specified to control the quality not only of the concrete, but also of the placing and curing. When such steps have been carefully followed there are very few chances of facing a mess or, if unforeseen conditions are creating some trouble, it will be easy to react and to correct the situation.