By R O Heckroodt
Execs involved in the outfitted surroundings are all too frequently faced with circumstances the place construction fabrics have failed in advance. the knowledge required for the knowledge of the reasons of such disasters, or for the ideal remedial motion comes in a few texts, but it is usually buried lower than a mass of alternative info.
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Cement admixtures: uses and applications, 2nd edn. Longman Scientific and Technical, 1988. J. and Bentur A. The science and technology of civil engineering materials. Prentice Hall, Englewood Cliffs, NJ, 1998, Ch. 11. 17 Buil M. -P. Conception des bétons: la structure poreuse. In La durabilité des Bétons. Presses Ponts et Chausées, Paris, 1982, Ch. 4. 18 Folliot A. and Buil M. La structuration progressive de la pierre de ciment. In Le béton hydraulique. Presses de l’École Nationale des Ponts et Chaussées, Paris, 1982, Ch.
Steel reinforcement is cast into concrete to augment shear and tensile properties of the material. e. qxd 16/07/02 13:54 Page 30 Deteriorated concrete: inspection and physicochemical analysis it will not rust. The following section highlights some of the potential problems that can occur as a result of the materials themselves. Cement • Ordinary Portland cement (OPC): The significance of the alkali content in relation to possible ASR needs to be considered. Have appropriate precautions been taken to avoid thermal cracking in high cement content deep-section members?
Physical actions The physical processes that cause a deterioration of concrete can be broadly classified as surface and internal damage. The most common cause of surface damage is abrasion, normally resulting from the action of water- or wind-borne solids. The internal damage to concrete results from the formation and propagation of micro-cracking due to stress levels in the material. 3 indicates some of the principal physical actions causing concrete deterioration: • • • • excessive induced stress abrasion fire damage internal stresses due to mechanical processes, corrosion of reinforcement and freeze–thaw damage.