Engineering and Contracting . ue for all concretesat all ages. The magnitude of this change isnot definitely known but experiments byBauschinger. Schumann, Tomei, Considere,Campbell. White and Gary show: (1) Neat cement hardening under water ex-pands per cent by volume, and the in-creased volume is approximately per centlor a period of from 30 days to five years. Themaximum expansion obtained at one year isnearly as great as at five years. (2) Neat cement hardening in air per cent by volume in from 16 weeks tofive years. (3) Cement-sand mortars change in likemanner b

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Engineering and Contracting . ue for all concretesat all ages. The magnitude of this change isnot definitely known but experiments byBauschinger. Schumann, Tomei, Considere,Campbell. White and Gary show: (1) Neat cement hardening under water ex-pands per cent by volume, and the in-creased volume is approximately per centlor a period of from 30 days to five years. Themaximum expansion obtained at one year isnearly as great as at five years. (2) Neat cement hardening in air per cent by volume in from 16 weeks tofive years. (3) Cement-sand mortars change in likemanner but to a lesser degree. Experiments by the University of Michiganshow the following results: (1) Neat cement hardening in air has anaverage unit linear contraction of — at 7aays- — at 28 days: — at 6 months:— at 1 year; — at 2 years: — 4 years. <2) That neat cement that has been hardened dear — ii niiu iiiiiiuj III . ,]m I. iu|ii,l»iul It Precip:taTion 1 | ,.

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