MY AMERICAN SCIENTIST: Login is temporarily disabled for maintenance.

Logo IMG
HOME > PAST ISSUE > March-April 2003 > Article Detail


Dating Ancient Mortar

Although radiocarbon dating is usually applied to organic remains, recent work shows that it can also reveal the age of some inorganic building materials

?sa Ringbom, John Hale, Jan Heinemeier, Lynne Lancaster, Alf Lindroos

Figure 7. Sampling of mortar . . .Click to Enlarge Image

Determining the age of ancient buildings is straightforward when they contain timbers, which can be readily dated by examining patterns of tree rings or by conventional radiocarbon analysis. But when no original wood is present, the situation is more challenging. One promising technique is to apply radiocarbon dating to ancient mortars, which absorb carbon dioxide from the atmosphere as they set. The difficulty is that such mortars often contain bits of limestone that were not converted to quicklime during initial preparation, or they include limestone fragments used as "aggregate." Fortunately, the effects of such contaminants can be reduced using appropriate mechanical, chemical and optical methods.

 Go to Article

comments powered by Disqus


Subscribe to American Scientist