Abstract
Background:Considering the high seismic vulnerability of masonry buildings located in the Italian territory, the implementation of seismic retrofit programs is strongly needed.. With consideration for sustainable interventions, it is evident that the retrofit techniques to protect the historical heritage should be carried out with innovative green compound materials, such as mortars reinforced with natural fibres.Objective:In the current paper, laboratory tests on lime mortars strengthened with raw jute fibres have been performed.Methods:The workability of the fibre-reinforced mixture has been assessed through shaking table tests, and the mechanical resistances of standard specimens have been evaluated by bending and compression tests.Results:Considering the hygroscopic nature of jute, it has been identified that the optimal water/lime ratio and the maximum water percentage are absorbed by jute fibres. From the results, how the spreading of the mixture, which is indicative of the mortar consistency, changes with the water/lime ratio, has been evaluated. From bending tests, the effective behaviour of fibres, which provide a stitching effect of the failure crack in the investigated fibre-reinforced lime mortars, has been observed.Conclusion:Finally, the results of compression tests have shown that the examined fibre-reinforced mortars can be effectively used as building products according to the actual Italian technical code NTC 2018.
Highlights
Looking at the data of the ISTAT census in 2011 [1], in Italy, there are more than 12 million residential buildings, of which 57.24% are made of masonry
Considering the hygroscopic nature of jute, it has been identified that the optimal water/lime ratio and the maximum water percentage are absorbed by jute fibres
Conclusion: the results of compression tests have shown that the examined fibre-reinforced mortars can be effectively used as building products according to the actual Italian technical code NTC 2018
Summary
Looking at the data of the ISTAT census in 2011 [1], in Italy, there are more than 12 million residential buildings, of which 57.24% are made of masonry. The vulnerability level of Italian masonry structures is very high [2, 3], so to often require seismic improvement and retrofitting interventions [4]. In this framework, based on a renewed sensitiveness towards eco-friendly and natural materials, the. Jute is a best fibre, like flax and hemp, and the stems are processed in a similar way This green material is environmentally friendly, 100% recyclable, and has high physical and mechanical features [8], which are similar to the hemp ones. With consideration for sustainable interventions, it is evident that the retrofit techniques to protect the historical heritage should be carried out with innovative green compound materials, such as mortars reinforced with natural fibres
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