Construction engineering CL mortar hydrated lime NHL mortar
Technische Universität Dresden
A. Costigan and S. Pavía, Mechanical properties of clay brick masonry bound with hydraulic limes and hydrated calcium lime. , 8th International Masonry Conference, Dresden, July 2010, W. Jäger, B. Haseltine, A. Fried, 2010, 903 - 914
Due to their physical and chemical properties, mortars made with lime are considered to be more
compatible with historic fabrics than those made with artificial cements. This paper explores the
mechanical properties of clay brick masonry bound with hydraulic limes of different strengths, and
hydrated calcium lime (CL90-s) with no hydraulic properties. Masonry wallettes built with a CL90-s
mortar and two natural limes of hydraulic strengths 3.5 and 5 MPa (NHL 3.5 and NHL 5) respectively
were tested for compressive and flexural strength. The strength of the bond between the mortar and
the brick was also measured. The paper concludes that CL mortar masonry displays a plastic
behaviour in compression while the mechanical behaviour of the HL mortar masonry is of a brittle
nature, with wallettes splitting along the centre, cracks above and below the vertical joints and spalling
of brick and mortar.
It also concludes that neither the rate of late strength gain of masonry, nor its ultimate compressive
strength or its bond strength are determined by the mortar nature, thus a mortar of low hydraulic
strength can provide stronger masonry than an emminetly hydraulic mortar. The paper agrees with
previous authors on that the masonry’s compressive strength is more sensitive to the brick-mortar
bond strength than to the compressive strength of the mortar. Finally, the paper demonstrates that the
NHL-mortar compressive strength increases at a higher rate, and reaches higher final values than
that of the NHLmasonry whereas, in contrast, the CL90-s mortar is weaker in compression than the
CL90-s mortar masonry.
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