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Dating mortar

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Archaeologists believe Egypt’s large pyramids are the work of the Old Kingdom society that rose to prominence in the Nile Valley after 3000 B. Historical analysis tells us that the Egyptians built the Giza Pyramids in a span of 85 years between 25 BC.

Interest in Egyptian chronology is widespread in both popular and scholarly circles.

In the last years the mortar dating through Optically Stimulated Luminescence (OSL) techniques has become a viable support for chronological estimations (date of construction or restoration episodes) of historical buildings.

However, the dating of mortar has still open issues mainly regarding the assessment of the bleaching degree of quartz, the analysis of the OSL processes for this type of samples and the need to do appropriate tests for the most correct evaluation of the equivalent dose.

The numbers of C14 atoms and non-radioactive carbon atoms remain approximately the same over time during the organism’s life.

Luminescence dating (including thermoluminescence and optically stimulated luminescence) is a type of dating methodology that measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past.

To put it simply, certain minerals (quartz, feldspar, and calcite), store energy from the sun at a known rate.

This energy is lodged in the imperfect lattices of the mineral's crystals.

Better still, unlike radiocarbon dating, the effect luminescence dating measures increases with time.

Mortars are typically made from a mixture of sand, a binder, and water.

The most common binder since the early 20th century is Portland cement but the ancient binder lime mortar is still used in some new construction.

For each mortar sample the adjacent brick was collected; in some cases, sampling of the bricks bracketing a mortar layer was a possibility, thus obtaining a direct comparison with the standard thermoluminescence (TL) dating on the bricks.

The results obtained show, for this set of samples, the possibility of dating the mortars through the use of the fine grain fraction provided of a suitable chemical-physical preparation procedure and the verification of the bleaching conditions.