Abstract
This research presents a novel approach based on the combination of nanotechnology and Roman technology by investigating how adding nanoCa(OH)2 and nanoSiO2 modify the performance of air lime mortars containing Roman ceramics. Microstructural, physico-mechanical properties were periodically controlled until 120 days of curing. XRD and TGA analyses showed that adding nanoSiO2 either alone or with nanoCa(OH)2 were more beneficial to improve the pozzolanic activity in the mortars. The less stable hydrated phases generated led to microcracks which eventually impaired compressive strength but enhanced deformability capacity. These results provide insight into the development of highly compatible mortars for cultural heritage.
Highlights
Before the discovery of Portland cement, lime-based mortars and plasters have been widely used in masonry buildings
The workability increased in the following order: M-NPs type 2 (NP2) (34.4%) > M-NPs type 1 (NP1) (24.9%) > M-NP1NS
This study investigated the influence of Ca(OH)2 and SiO2 nanoparticles on the microstructure, the mechanical performance and the physical properties of air lime mortars with Roman ceramics
Summary
Before the discovery of Portland cement, lime-based mortars and plasters have been widely used in masonry buildings. The slow setting and carbonation times as well as the high drying shrinkage are well-known disadvantages of using lime as binder in mortars [5]. Thereby, its use was gradually replaced by cement which has several advantages over it (mainly its quick set time and low cost). The use of cement as binder has received considerable critical attention in historic building restorations due to its incompatibility with the ancient masonry [6,7]. In recent years, there has been a renewed interest in lime-based mortars for restoration purposes [6,7,8,9,10]. Finding new additives to improve specific lime mortar properties has become a major concern among researchers in this field [1,8,11,12,13]
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