Abstract
This work deals with the effects of an expanded perlite (EP) on the hardened properties of air lime mortars with a 50% brick waste powder content. The influence of different substitution of quartz sand by EP is also monitored here. A relationship between EP content and physical-mechanical properties of mortar (flexural and compressive strength, pore system) and mortar frost resistance has been found. Very good contact between the binder matrix and EP surface was observed in microstructural images of mortars that conclusively exhibits the formation of products by pozzolanic reaction on the surface of EP. This work could be helpful for the establishment of the essential proportions of EP and quartz sand to be used in air lime mortars designed for restoration works.
Highlights
Lightweight aggregates are used in plasters to improve their acoustic and thermal insulation, or fire resistance [1,2,3,4,5]
The partial replacement of lime by brick waste powder resulted in improvements in the strengths of the mortar, the compressive strength
The effect of expanded perlite (EP) content on the values of strengths is out of accord to the previous observations on lime-brick powder plasters with expanded clay aggregate, where the strengths decreased with increasing amount of lightweight aggregate [15]
Summary
Lightweight aggregates are used in plasters to improve their acoustic and thermal insulation, or fire resistance [1,2,3,4,5]. Nowadays, expanded perlite (EP) is used as a component of lightweight cement or lime-cement pre-mixed coating mortars fulfilling today hygrothermal requirements on buildings performance [6]. These materials are usually hydrophobized, they show worse properties in the comparison with traditional lime mortars, mainly a limited moisture transport to the plaster surface. Waste brick powder was used to improve the strength characteristics of lime mortar as a cement replacement due to the suppose applications of mortars in restoration works. The combination of EP and waste brick powder in lime mortars seems to be auspicious [13, 14]
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