Sulfate Attack on Concrete - Chapter 3 pot

... of concrete are summarized by ACI as follows (Table 3. 1). When examining concrete deterioration, one has to take into considera- tion the local microclimate the concrete is exposed to. The concrete ... high sulfate concentrations, and it is not only the concentration of sulfate anions per se but also the type and concentration of the accompanying cations that should be taken in...

Ngày tải lên: 08/08/2014, 10:23

... the avail- able silica to form additional C-S-H. For additional information on the role portlandite in hydration and deterioration of concrete consult Skalny et al. (2001). Both C-S-H and calcium ... hydration reactions in concrete are, in turn, influenced by the production processes and the environmental conditions prevailing during the pro- duction of concrete. Thus, in designing co...

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... limitations of visual inspections. 5.3CONSEQUENCES OF SULFATE ATTACK ON THE MICROSTRUCTURE OF CONCRETE In Chapter 4, the consequences of sulfate attack (from internal or external causes) on the ... as ettringite formation). 5.4CONSEQUENCES OF SULFATE ATTACK ON THE MECHANICAL PROPERTIES OF CONCRETE Reports on the consequences of composition-induced internal sulf...

Ngày tải lên: 08/08/2014, 11:20

... Minimize Attack on Concrete by Sulfate Soils and Waters. Crammond, N.J., Longworth, T.I. and Sibbick, R.G. (2001) “Tredington–Ashchurch Bridge on the M5: Examination of TSA-affected concrete ... Odler Swenson, E.G. (ed.) (1968) Performance of Concrete: Resistance of Concrete to Sulph- ate and other Environmental Conditions, A Symposium in Honour of Thorbergur Thorvaldson, Univ...

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... extract 1.2–2 .3 — 1 4 33 0 0.50 2 30 0 0.55 3 280 0.55 3 1.5 3. 0 — 2.4 3. 7 — 2 34 0 0.50 3 320 0.50 4A 3. 1–6.0 ≤ 1.0 3. 8–6.7 ≤ 1.2 2 38 0 0.45 3 360 0.45 4B 3. 1–6.0 >1.0 3. 8–6.7 >1.2 3 360 0.45 5A ... Durable Concrete, ACI Manual of Concrete Practice: Part 1 – 1998, American Concrete Institute, Farmington Hill, MI. ACI 31 8-9 9 (1999) Building Code...

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... subjected to external sulfate attack 5 .3 Consequences of sulfate attack on the microstructure of concrete 5.4Consequences of sulfate attack on the mechanical properties of concrete 5.5Concluding remarks References 6Prevention ... chemicals 3. 1.3Expansive reactions with aggregate 3. 1.4Frost-related deterioration 3. 1.5Corrosion of embedded steel 3. 1.6Abrasion,...

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... assure long-lasting durability of concrete structures in sulfate- bearing environment. Man abuses concrete by: • use of wrong or marginal concrete materials and improper mix pro- portions; • inappropriate ... Committee for Reinforced Concrete (1989) Recommendation on the Heat Treatment of Concrete (in German), Berlin, September. BRE Digest 36 3 (1996) Sulfate and acid at...

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... available for reaction with cement components of the concrete mixture. Quality Control is clearly one key issue in the protection of concrete against composition-induced internal sulfate attack. It is ... HEAT-INDUCED INTERNAL SULFATE ATTACK Proper mixture design is one way of protecting concrete against degradation by heat-induced internal sulfate attack. The materials use...

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... effect of sulfate attack on service life of concrete. The model is based on following assumptions: 1 Sulfate ions from the environment penetrate the concrete by diffusion; 2 Sulfate ions react ... volumetric expansion upon sulfate attack. The model is based on the potential for expansion provided by both C 3 A content of the cement and the sulfate ion concentration...

Ngày tải lên: 08/08/2014, 11:20

Ngày tải lên: 08/08/2014, 11:20