By Ravindra Dhir, Peter Hewlett

ISBN-10: 020347662X

ISBN-13: 9780203476628

ISBN-10: 0203784863

ISBN-13: 9780203784860

ISBN-10: 0419214801

ISBN-13: 9780419214809

As a part of the ""Concrete within the provider of Mankind"" set, those convention court cases speak about radical concrete technology.

summary: As a part of the ""Concrete within the carrier of Mankind"" set, those convention complaints speak about radical concrete know-how

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Extra info for Concrete in the Service of Mankind : Radical concrete technology

Sample text

The metakaolin concrete placement locations varied for each project. Consequently, durability requirements differed, ie. chemical (acid resistance) or physical (erosion by wave action). This report will focus on three of the projects undertaken. The adverse exposure conditions and concrete mixing and placement will be discussed. The results of measurements (compressive strength, oxygen permeability and chloride penetration) carried out on the hardened concrete up to 2 1/2 years after placement will be presented and discussed.

Tests carried out on the metakaolin concrete after 10–30 months demonstrated excellent strength development, average-to-low oxygen permeability and low chloride penetration. We will continue to monitor the structures and assess their resistance to abrasive fluids, acid and sulphate attack, and freeze-thaw damage. The extra cost of using metakaolin concrete is modest, compared with the total project cost (detailed discussion on costs will be given in a separate paper). We expect that, over the life-time of the constructions reported here, we will demonstrate improved durability and reduced maintenance costs.

Excellent freezing and thawing resistance is obtainable with air entrained concrete containing either silica fume or calcium nitrite or combinations of the two [41]. 6 Compressive strengths in excess of 40 MPa are often specified to produce durable concrete. As noted in reference 40 compressive strengths in excess of 40 MPa are easily Concrete Canada programme 35 reached in durable concretes, however, not all concrete with compressive strengths above 40 MPa are necessarily durable. Thus, compressive strength alone is a poor measure of durability.

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Concrete in the Service of Mankind : Radical concrete technology by Ravindra Dhir, Peter Hewlett

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