DURABILITY OF FIELD CONCRETE MADE OF PORTLAND CEMENT AND SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER SEVERAL EUROPEAN EXPOSURE CONDITIONS

摘要

Deterioration of cementitious materials by sulfate ions is a concern for concrete in contactwith ground water (and in a lesser extent sea water) in many parts of Europe, and is animportant issue for underground construction identified as a major area for progress in theconstruction industry. Sulfate resistance relates closely to testing and standardization andtheretbre to prescriptive approaches. The lack of feed back on the durability of structuresmade of blended cements makes it difficult to fit these new concretes with existing testmethods and performance criteria. This paper concerns the microstructural study of fieldsamples and structures made of blended concrctes available across Europe. This concernsseveral materials exposed to various climate regimes, ranging from Southern to NorthernEurope (Spain, Germany, United Kingdom, Denmark and Norway). Complementarytechniques such as SEM, micro-XRF, XRD and PIXE are used to evaluate the microstructuralperformance and stability of the phase assemblage of those blended concretes in the case ofsulfate (and chloride in some instances) ingress, compare to pure Portland concrete.