clay plaster is quite an old building application, nowadays, more durable clay plasters can be produced on the
basis of quality control in the industrial sense. In the literature, there are many studies dealing with adobe and
rammed earth materials. However, investigations covering the characteristics of clay plasters are limited. In
this study, the performance of ready-mixed clay plasters was examined with regard to the moisture content of
the samples during the test, the mixture content of the water and the clay/sand ratios. Compressive strength
and shrinkage (volumetric and observational) of the clay plasters were considered as key parameters for the
performance analysis. In addition, simple field tests, used for analysis of the composition of earth buildingmaterials,
were carried out in order to evaluate the effect of the clay/sand ratio on the performance of the clay plasters. As a
result, an increase in the initialwater content of the mixture and/or the moisture content of the samples during the
test had a negative effect on the compressive strength. Furthermore, the optimum clay/sand ratio was between
0.43 and 0.66 by weight when the shrinkage and compressive strength results were considered all together