Characterisation Of Mechanical Properties Of
Historic Mortars – Testing Of Irregular Samples
Author(s)
J. Válek & R. Veiga
Abstract
The design of new renders and repair mortars requires a certain knowledge about
the mechanical properties of historic materials. The common problem is that the
extracted samples of historic mortars often have an irregular shape not suitable
for standardised physical and mechanical laboratory tests. This is for example a
problem with the testing of bedding mortars from historic brick masonry and/or
renders where a typical sample width is around 10–15mm. Typical samples from
wall cores are mortar bulks of very irregular shapes. In addition to the various
non-standard sizes and shapes there is often a need for minimum intervention
which leads to minimalisation of samples in numbers and sizes. The
experimental part describes testing of specimens made of irregular samples of
historic and modern mortars in compression and bending. The key problem was
obtaining a certain measurable shape. This was done by cutting of the sample or
by adding some material. The determined properties are compared to the
properties obtained from the tests on standard specimens. The methods of testing
are discussed and evaluated.
Keywords: historic lime mortar, non-standard testing, compressive and flexural
strength, irregular mortar sample.
1 Introduction
Historic mortars are mostly lime based and if the lime is non-hydraulic, their
strength in compression can typically be between 0.5-3.0N/mm2. If the lime is
hydraulic or some puzzolanic material is added then the compressive strength
depends on the amount of the hydraulic components and their reactivity
connected with curing conditions. One can expect compressive strength of such
Keywords
historic lime mortar, non-standard testing, compressive and flexural
strength, irregular mortar sample.
Related Book
Other papers in this volume
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