The use of effective time expressions in a laminated plate model allowed for the prediction of long term creep compliance.

Key words: creep, masonry, creep compliance, rheological modelling.

Significant ageing is also predicted for the stress overshoot in nonlinear shear startup and for the creep compliance.

To the first approximation, this is estimated from a plot of creep compliance against, and is the contribution from viscous flow.

This shows plots of log J(t) the shear creep compliance, as a function of log t for a range of temperatures covering the glass transition.

It was shown that the low molecular weight materials have higher creep compliance and creep rate, and are more sensitive to temperature than the high molecular weight materials.

Here, values of shift factor a are obtained by horizontal shift log(a) of creep compliance data plotted vs. time or frequency in double logarithmic scale so that a data set obtained experimentally at temperature T superposes with the data set at temperature T.