Abstract
Given the need for the development of interdisciplinary studies and research, including in the Engineering field and in the Building sector, this paper suggests a multidisciplinary approach to the maintenance of lithic surfaces, by analyzing some high-performance building materials and products, such as hydrophobization coating films. As it has been determined and acknowledged by the scientific community worldwide, the main aggression factor affecting the geomaterials used in the construction of heritage assets is represented by water and/or excessive humidity, especially in the case of the use of porous limestone, such as those available in the Repedea - Iasi area (Romania). Therefore, in order to ensure better maintenance of a lithic calcareous material of this type, it is necessary to use a hydrophobic preventive treatment. The findings of the research conducted and described in this paper represent one of the first steps on the path to standardization regarding the confirmation of the efficiency of the hydrophobization products, which have been increasingly present on the Romanian specialized market lately. Thus, this paper is addressed to all the specialists interested in maintaining the lithic surfaces exposed to various environmental factors, as it is useful for both historical and civil constructions.
Highlights
Experimental part Materials and methodsThis paper describes a method that assesses hydrophobization efficiency, under laboratory conditions, for eight types of coating agents, involving both colorimetric analysis of the treated lithic surfaces, both before and after coating, and during the accelerated artificial ageing by exposure to UV radiation, under laboratory conditions
Given the need for the development of interdisciplinary studies and research, including in the Engineering field and in the Building sector, this paper suggests a multidisciplinary approach to the maintenance of lithic surfaces, by analyzing some high-performance building materials and products, such as hydrophobization coating films
Natural stone is considered a construction material that stands the test of time, the degradation and deteriorate rate of architectural surfaces has been increasing over the last decades, especially due to anthropic causes, mainly to atmospheric pollution [1,2,3], and due to intrinsic factors, by using low quality indigenous lithic materials, which favor the rapid onset of the aforementioned alterations
Summary
This paper describes a method that assesses hydrophobization efficiency, under laboratory conditions, for eight types of coating agents, involving both colorimetric analysis of the treated lithic surfaces, both before and after coating, and during the accelerated artificial ageing by exposure to UV radiation, under laboratory conditions. After sampling the desired stones in Paun - Repedea village area (geographical coordinates: 470 06ʹ33ʺ N/270 39ʹ59ʺE), the lithic material samples were obtained by cutting the stone in the form of roughly parallelepipedal slices, in order to obtain at least one flat surface for each sedimentary limestone sample. Four of these samples, marked P0.1, P0.2, P0.3 and P0.4, are chemically untreated samples, having the role of control samples. The lithic samples were stored in the desiccator for 48 hours and subsequently the following analyses (stages) were carried out: 1. initial colorimetric measurements, before coating (the data collected are summarized in table 4, except for the control samples); 2. chemical coating treatment, followed by restorage in the desiccator for another 48h, to stabilize the humidity of the hydrophobized surfaces; 3. colorimetric measurements to determine color changes after the chemical treatment (Table 4); 4. simultaneous UV radiation exposure of the 12 samples after hydrophobization of samples P1 ÷ P8, the total exposure period being 48h for each sample
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