Autogenous and Hygrometric Expansion of Mass Concrete


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Title: Autogenous and Hygrometric Expansion of Mass Concrete

Author(s): J. Laginha Serafim and Marciano Guerreiro

Publication: Journal Proceedings

Volume: 66

Issue: 9

Appears on pages(s): 716-719

Keywords: concrete dams; expansion; free lime; hygroscopicity; magnesium oxides; mass concrete; permeability; strain gages; temperature; volume change.

Date: 9/1/1969

After emphasizing the lack of data on autogenous and hygrometric expansions of mass concrete in the technical literature, it is pointed out that this phenomenon occurs very frequently dams. In fact, an adequate examination of the results obtained from the no-stress strain meters used for the observation of these structures reveals the existence and the magnitude of these expansions. Examples are cited of concretes with and without autogenous expansion. This type of expansion is related to free lime (CaO ) and magnesia (MgO). A correlation is shown between the autogenous expansion and the mean temperature inside the mass during the curing of the concrete.