scholarly journals Study for Useful Functionalities of Lime Plaster Paint:

2021 ◽  
Vol 72 (5) ◽  
pp. 276-281
Author(s):  
Risako AKASU ◽  
Akira NUMAZAWA ◽  
Jiro YASUDA
Keyword(s):  
Lime Plaster

Lime Plasters Containing Waste Ceramic Powder as Partial Replacement of Siliceous Aggregates

2014 ◽  
Vol 1035 ◽  
pp. 77-82 ◽  
Author(s):  
Eva Vejmelková ◽  
Monika Čáchová ◽  
Dana Koňáková ◽  
Pavel Reiterman ◽  
Robert Černý
Keyword(s):  
Water Vapor ◽  
Bending Strength ◽  
Ceramic Powder ◽  
Point Of View ◽  
Partial Replacement ◽  
Diffusion Resistance ◽  
Vapor Diffusion ◽  
Water Vapor Diffusion ◽  
Hollow Brick ◽  
Lime Plaster

Waste materials are utilized with an increasing frequency in the building industry, during the last decades. The motivation is both environmental and economical. In this paper, waste ceramic powder produced at the grinding of hollow brick blocks used in precise-walling technologies, is applied as a partial replacement of siliceous aggregates of lime plasters. The designed plaster mixes are analyzed from the point of view of their basic physical, mechanical, hygric and thermal properties. The bulk density, matrix density, open porosity, compressive strength, bending strength, water vapor diffusion permeability, water vapor diffusion coefficient, water vapor diffusion resistance factor, thermal conductivity and specific heat capacity are the investigated parameters. A reference lime plaster is analyzed as well, for the sake of comparison. Experimental results show a remarkable enhancement of mechanical properties of the plasters with the increasing dosage of ceramic powder. Moreover, the thermal insulation properties are improved and the water vapor diffusion capability of the plasters with ceramic powder increases.

Thermal insulating lime plaster

2016 ◽  
pp. 1629-1634
Author(s):  
H. Hansen ◽  
A. Ethesham ◽  
T. Bech-Petersen ◽  
M.S. Moesgaard
Keyword(s):  
Thermal Insulating ◽  
Lime Plaster

scholarly journals FTIR-Based Crystallinity Assessment of Aragonite–Calcite Mixtures in Archaeological Lime Binders Altered by Diagenesis

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 121 ◽  
Author(s):  
Michael Toffolo ◽  
Lior Regev ◽  
Stéphan Dubernet ◽  
Yannick Lefrais ◽  
Elisabetta Boaretto
Keyword(s):  
Unknown Origin ◽  
Infrared Light ◽  
Infrared Spectrometry ◽  
Atomic Order ◽  
Range Atomic Order ◽  
Mechanisms Of Formation ◽  
History Of ◽  
Lime Plaster ◽  
Archaeological Sediments ◽  
Diagenetic History

Lime plaster and mortar are pyrotechnological materials that have been employed in constructions since prehistoric times. They may nucleate as calcite and/or aragonite under different environmental settings. In nature, aragonite and calcite form through biogenic and geogenic processes that lead to different degrees of atomic order. The latter is a result of defects in the crystal lattice, which affect the properties of crystals, including their interaction with infrared light. Using Fourier transform infrared spectrometry (FTIR) with the KBr pellet method, it is possible to exploit these differences and assess the degree of atomic order of aragonite and calcite crystals and thus their mechanisms of formation. Here we use FTIR to characterize the degree of short-range atomic order of a pyrogenic form of aragonite recently observed in experimental and archaeological lime binders. We show that pyrogenic aragonite has a unique signature that allows its identification in archaeological sediments and lime binders of unknown origin. Based on these results, we developed a new FTIR-based method to assess the integrity and degree of preservation of aragonite and calcite when they occur together in the same material. This method allowed a better assessment of the diagenetic history of an archaeological plaster and finds application in the characterization of present-day conservation materials, such as lime plaster and mortar, where different polymorphs may nucleate and undergo recrystallization processes that can alter the mechanical properties of binders.

scholarly journals Luminescence reveals variations in local structural order of calcium carbonate polymorphs formed by different mechanisms

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Michael B. Toffolo ◽  
Giulia Ricci ◽  
Luisa Caneve ◽  
Ifat Kaplan-Ashiri
Keyword(s):  
Infrared Spectroscopy ◽  
Calcium Carbonate ◽  
Construction Materials ◽  
Reference Database ◽  
Formation Processes ◽  
X Ray Diffraction ◽  
Structural Order ◽  
Lime Plaster ◽  
Calcium Carbonate Polymorphs

Abstract In nature, calcium carbonate (CaCO3) in the form of calcite and aragonite nucleates through different pathways including geogenic and biogenic processes. It may also occur as pyrogenic lime plaster and laboratory-precipitated crystals. All of these formation processes are conducive to different degrees of local structural order in CaCO3 crystals, with the pyrogenic and precipitated forms being the least ordered. These variations affect the manner in which crystals interact with electromagnetic radiation, and thus formation processes may be tracked using methods such as X-ray diffraction and infrared spectroscopy. Here we show that defects in the crystal structure of CaCO3 may be detected by looking at the luminescence of crystals. Using cathodoluminescence by scanning electron microscopy (SEM-CL) and laser-induced fluorescence (LIF), it is possible to discern different polymorphs and their mechanism of formation. We were thus able to determine that pyrogenic calcite and aragonite exhibit blue luminescence due to the incorporation of distortions in the crystal lattice caused by heat and rapid precipitation, in agreement with infrared spectroscopy assessments of local structural order. These results provide the first detailed reference database of SEM-CL and LIF spectra of CaCO3 standards, and find application in the characterization of optical, archaeological and construction materials.

Structural Characterization and Thermal Decomposition of Lime Binders Allow Accurate Radiocarbon Age Determinations of Aerial Lime Plaster

Radiocarbon ◽  
2020 ◽  
Vol 62 (3) ◽  
pp. 633-655 ◽  
Author(s):  
Michael B Toffolo ◽  
Lior Regev ◽  
Eugenia Mintz ◽  
Ifat Kaplan-Ashiri ◽  
Francesco Berna ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Isotopic Signature ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Lime Mortar ◽  
X Ray ◽  
Radiocarbon Age ◽  
Carbon Recovery ◽  
Lime Plaster ◽  
Thin Section Petrography

ABSTRACTRadiocarbon (14C) dating of anthropogenic carbonates (CaCO3) such as ash, lime plaster and lime mortar, has proven a difficult task due to the occurrence of a number of contaminants embedded within the CaCO3 pyrogenic binder. These include 14C-free geologic components and/or secondary phases bearing an unknown amount of 14C, and thus the alteration of the original pyrogenic isotopic signature of the material results in major age offsets when carbon recovery is performed through acid hydrolysis. Here we present a characterization/quantification approach to anthropogenic carbonates that includes Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, thin section petrography, thermogravimetric analysis and scanning electron microscopy coupled with high-resolution cathodoluminescence, with which we identified the pyrogenic CaCO3 fraction in an aerial lime plaster and two hydraulic mortars. The preserved pyrogenic component was then isolated by density separation and its purity checked again using FTIR. Carbon was recovered through thermal decomposition in vacuum. The resulting 14C age matches the expected age of the lime plaster, whereas hydraulic mortars are slightly offset due to the carbonation of calcium hydroxide lumps. This approach highlights the importance of a dedicated characterization strategy prior to dating and may be applied to aerial lime plasters to obtain accurate ages.

Maya Blue: An Unsolved Problem in Ancient Pigments

1962 ◽  
Vol 27 (4) ◽  
pp. 557-564 ◽  
Author(s):  
Rutherford J. Gettens
Keyword(s):  
Unsolved Problem ◽  
Special Kind ◽  
Wall Painting ◽  
Blue Pigment ◽  
Blue Color ◽  
Southern Mexico ◽  
True Nature ◽  
Research Material ◽  
Maya Blue ◽  
Lime Plaster

AbstractThe early peoples of Southern Mexico decorated pottery and painted pictures on walls with a stable blue pigment which is not found elsewhere in the world. Investigation of this blue was started over 30 years ago, but still the true nature of the blue color principle is unknown. Since the blue cannot be destroyed by boiling nitric acid, it does not seem to be vegetable or organic in origin. It is quite unlike azurite or natural ultramarine or other blue minerals which were employed as sources of blue pigment by other ancient peoples. The main obstacle in the investigation is the extreme scarcity of research material. The only samples of the blue available for testing are thinly painted films on potsherds and on wall painting fragments where it is mixed with lime plaster and other impurities. Although attempts to procure lump specimens of the blue, even in gram quantitives, have failed, some progress has been made. It is now known that the inorganic base of the blue pigment is a clay mineral called attapulgite. Ordinary attapulgite is nearly colorless. We still do not know what makes the clay blue; whether it is a special kind of attapulgite or if the Maya produced it artifically. In this paper all the evidence accumulated to date is reviewed.

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