By P.H. Perkins
A wealth of modern learn into the continuing deterioration of strengthened concrete buildings has resulted in a overview of equipment of research and service innovations. This completely revised and up to date variation brings jointly the elemental facets of this around the world challenge and provides recommendation on how investigations, analysis and consequent remedial paintings might be performed.
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Extra resources for Repair, protection and waterproofing of concrete structures
It should not bond to the sealant; if it does, a bond breaker must be used. 5. It must be easily formed to the correct dimensions and be readily inserted into the joint. 6. Additional properties may be required for special purposes (such as tanks holding potable water, sewage tanks, tanks holding chemical waste, and petroleum oil). The main materials used for joint fillers are: 1. cork granules bonded in a resin which is suitable for long-term immersion in water; 2. cork granules bonded in bitumen which is suitable for immersion in water, but the bitumen may render it unsuitable for use in tanks holding potable water; 3.
When used in combination with OPC it increases the resistance of the concrete to sulphate attack, and to ASR by limiting the alkali content of the binder (cement plus ggbs). The proportions used with OPC depends on the required effect on the resulting concrete. Generally, mixes containing 40% ggbs and 60% OPC to 65% ggbs and 35% OPC are used. 3 Condensed silica fume Condensed silica fume is a waste product of the ferrosilicon industry. It consists of 88–98% of silicon dioxide (SiO2) with very small percentages of carbon, ferric oxide, aluminium oxide (alumina) and oxides of magnesium, potassium and sodium.
The shelf life of polyester resins is strictly limited while that of epoxies is almost unlimited. For the resin to harden, a catalyst must be added and this results in the development of strong molecular chains. Copyright 1997 Taylor & Francis Group • The amount of catalyst used does not require the same accuracy of measurement as that needed for epoxies. The curing of polyester mortars is adversely affected by the presence of moisture. A primer should always be used. 4 Polyurethane resins These are used mainly as the basic resin for floor sealants and coatings.