Abstract
Synopsis The influence of calcium lignosulphonate admixture upon the creep characteristics of two mortars, made with cements having different C3A contents, has been studied. The degree of hydration of the mixes at loading and throughout the loading period was the main parameter. For any mix, with or without admixture, the creep strain is the same for a given increase of hydration under load, provided that all the mixes are loaded at the same degree of hydration and the same stress-strength ratio. This suggests that the age at loading only affects creep in so far as it is related to the degree of hydration and development of strength. Creep after a certain time has two components: ‘non-hydrating creep’, which corresponds to the state of hydration at loading without further hydration under load, and ‘maturing creep’, which is related to the progress of hydration while under load.
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