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The usage of lightweight aggregates in concrete or mortar is increasing remarkably due to energy and safety reasons. The important factor for energy saving (heat insulation) in buildings is the used construction materials and their thermal properties. Pumice is an abundantly consumed, cheap and important industrial raw material for the lightweight aggregate that essentially used for making building blocks. The usage of porous lightweight aggregate is becoming common world wide as a heat insulation material and important part of the world pumice reserves is in Turkey. Nowadays, usage of building elements produced from this material is becoming highly widespread. In North Cyprus, use of pumice was introduced with Pumice Blocks. It is widely accepted by the civil engineers and architects that walls made of pumice block could insulate both heat and sound and reduce the dead load of building compared t