Study of the Behavior of Structural Materials Treated with Bioconsolidant.

Michela Lerna,Arianna Cisternino,Yolanda Spairani,Salvador Ivorra,Dora Foti

doi:10.3390/ma14185369

Michela Lerna, Arianna Cisternino + Show 3 more

Open Access

https://doi.org/10.3390/ma14185369

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Abstract

In this article, the effectiveness of the bioconsolidation technique applied to degraded structural materials is illustrated as a new method of consolidation and conservation of the existing building heritage in a less invasive way. Satisfactory results have been obtained by an experimental campaign carried out through non-destructive diagnostic tests, static destructive mechanical tests, and microstructural analyses on a series of natural stone material specimens and artificial stone materials before and after the use of bioconsolidants. The consolidated specimens have been tested after three to four weeks after the application of the M3P nutritional solution on each specimen. The effect on the microstructure of this technique has also been observed using scanning electron microscope and optical photomicrograph, the formation of new calcium carbonate crystals promoting the structural consolidation of the materials under examination was observed in all the specimens analyzed.

Highlights

The decay of the existing building heritage is a consequence of the various degradation phenomena that affect all materials, natural or artificial, used in building construction.Degradation can be defined as that process that involves harmful modifications of building materials, causing deterioration of their chemical-physical and structural characteristics.The visible effects of this phenomenon vary depending on the material, and they are products of the action caused by different weather conditions and physical, chemical, and biological factors that induce a progressive dissolution of the mineral matrix of the material used in the construction of the building
The product manufacturing process involves a rigorous and complex process of processing and autoclaving performed at constant temperature and pressure in order to avoid contamination of the culture, ensuring the effectiveness and purity of the product used in bioconservation and restoration of cultural heritage, sculptural monuments, consolidation of ornamental stones, reconstruction and repair of cracks in stone materials
The scanning electron microscopy (SEM) technique is performed on the fragments of the treated specimens previously subjected to breakage

Summary

Introduction

The decay of the existing building heritage is a consequence of the various degradation phenomena that affect all materials, natural or artificial, used in building construction.Degradation can be defined as that process that involves harmful modifications of building materials, causing deterioration of their chemical-physical and structural characteristics.The visible effects of this phenomenon vary depending on the material, and they are products of the action caused by different weather conditions and physical, chemical, and biological factors that induce a progressive dissolution of the mineral matrix of the material used in the construction of the building. Degradation can be defined as that process that involves harmful modifications of building materials, causing deterioration of their chemical-physical and structural characteristics. This belltower has a direct exposition to the sea wind loads, and these aggressive environmental effects have produced superficial damages on the structural calcarenite stone. This structure is a suitable example of the possible application of the proposed method for the consolidation of the superficial damage observed

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