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Additional resources for Repair, protection and waterproofing of concrete structures

Sample text

1. those based on synthetic resins; 2. those based on silicates of sodium and potassium; 3. those based on natural rubber and synthetic rubber latexes. Synthetic resin cements are resistant to a wide range of chemicals, including acids, alkalies and solvents. The resins used include polyester, phenolic and furane. Mortars based on polyester resins can give exceptionally high compressive strengths (90–100N/mm2). Silicate cements are resistant to a wide range of acids and to very high temperatures, but are generally not resistant to alkalies.

Constituent materials The constituent materials are: • • • • • • Portland cements—BS 12 etc and ENV 197–1; high alumina cement (HAC)—also known as calcium aluminate cement; corrosion-resistant cements; aggregates from natural sources for concrete and mortar; admixtures; water. Associated materials The main associated materials are: • steel reinforcement; • non-ferrous metals; • joint fillers and sealants; • polymers and reactive resins. The information given in this chapter is intended to be of a general nature and users of the materials listed should always refer to the latest edition of the relevant National Standard.

The degree of hazard varies from one compound to another. Reference should also be made to the Health and Safety Executive and the requirements of this Authority. The Construction (Design and Management) Regulations 1994 are intended to supplement health and safety legislation and were initiated by the European Union. The first part came into effect in March 1995, and by the end of December 1995, all the remaining provisions became effective. The Regulations are proactive, making people assess risks and take precautions, rather than dealing with problems once they have occurred.

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