Tailoring the binder matrix of lime-based binders for restoration interventions with regard to mechanical compatibility

Dimou, Angeliki-Eirini; Metaxa, Zoi S.; Kourkoulis, Stavros K.; Karatasios, Ioannis; Alexopoulos, Nikolaos D.

doi:10.1016/j.conbuildmat.2021.125717

Cited by 7 publications

(1 citation statement)

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“…The water to binder (W/B) ratio was set at 0.55, based on previous research article of the authors [ 27 ]. Based on the evaluation of the aqueous dispersions (more details can be found in the Results section), one “optimal” combination of ultrasonic energy and concentration was selected to produce composite pastes for each, different carbon nanostructure.…”

Section: Methodsmentioning

confidence: 99%

Piezoresistive Properties of Natural Hydraulic Lime Binary Pastes with Incorporated Carbon-Based Nanomaterials under Cyclic Compressive Loadings

et al. 2022

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Natural Hydraulic Limes (NHL) are extensively used for the restoration of Monuments of Cultural Heritage, often combined with pozzolanic materials, such as natural pozzolans and metakaolin etc. In the present study, five (5) different cases of binary lime-based pastes composed of a specific type of NHL (NHL5) and metakaolin as pozzolanic addition were examined, that were reinforced with carbon nanostructures, namely graphene and carbon nanotubes. For the first time in restoration mortars, the incorporation of carbon nanostructures was investigated, aiming to produce materials with adequate piezoresistive response, so that they have the potential to be exploited for in situ structural health monitoring. The compressive strength, flexural strength, electrical resistance and piezoresistive response of the composite pastes was examined. The results showed that all modified carbon nanostructures lead to a significant reduction in electrical resistance. The pastes reinforced with 2D nanostructures (graphene family) displayed up to 30% increase in compressive strength and the pastes reinforced with 1D nanostructures (carbon nanotubes) displayed enhanced flexural strength (up to 100% increase). Piezoresistivity was attained for almost all investigated pastes, nevertheless the graphene oxide (GO) was considered as optimal reinforcement as the sensing ability of such pastes was found to be almost proportional to the applied compressive load level.

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Section: Methodsmentioning

confidence: 99%