Effects of Various Chemical Agents on Mechanical Characteristics of Weak Lime Mortar

The mechanical characteristics of a fiber reinforced material depend on a number of parameters related to the structure and characteristics of the component materials, the volumetric distribution, orientation, geometry and adhesion of the fibers to the matrix. The modification of these characteristics over time is due to the varied mechanical demands (repeated or lasting), the thermal and humidity demands, the chemical agents and the influence of aging. The paper presents some observations resulting from experimental tests on polyester-glass composite materials developed in the Materiaux Composites laboratory.

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Α Nano Approach to Consolidation of Degraded Historic Lime Mortars

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.8.13 ◽

2009 ◽

Vol 8 ◽

pp. 13-22 ◽

Cited By ~ 20

Author(s):

Miloš Drdácký ◽

Zuzana Slížková ◽

Gerald Ziegenbalg

Keyword(s):

Comparative Study ◽

Calcium Hydroxide ◽

Isopropyl Alcohol ◽

Mechanical Characteristics ◽

Colloidal Suspensions ◽

Standard Test ◽

Barium Hydroxide ◽

Lime Mortar ◽

Lime Water ◽

Lime Mortars

This paper presents a comparative study of the effects of calcium hydroxide based agents on consolidating a lean lime mortar. In the first part, it describes the properties and characteristics of CaLoSiL® – a new stone strengthener based on colloidal suspensions of lime nanoparticles in various solvents. It further summarizes the results of recent tests on the influence of applying nano-agents based on colloidal calcium hydroxide dispersed in ethanol or isopropyl alcohol (CaLoSiL®), and compares them with the effects of lime water and with a traditional barium hydroxide treatment. The tests were carried out on non-standard test specimens fabricated from a lean mortar (1:9) and developed specially for the purpose of testing the relatively low strengthening effects that are typical for lime water consolidation. The comparison presented in this paper is based on the mechanical characteristics of consolidated lime mortar.

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A Study on Mechanical Characteristics of Masonry Structure Constructed by Clay Brick with Lime Mortar

Journal of the Korea institute for structural maintenance inspection ◽

10.11112/jksmi.2011.15.4.087 ◽

2011 ◽

Vol 15 (4) ◽

pp. 87-98

Author(s):

Hye Ran Yu ◽

Ki Hyuk Kwon

Keyword(s):

Mechanical Characteristics ◽

Masonry Structure ◽

Clay Brick ◽

Lime Mortar

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The behavior in finishing of textile materials made of man-made fibers containing ZnO in blends with cotton

Industria Textila ◽

10.35530/it.069.03.1477 ◽

2018 ◽

Vol 69 (03) ◽

pp. 212-218

Author(s):

POPESCU ALINA ◽

CHIRILA LAURA ◽

TOMA DOINA ◽

RASCOV MARIAN ◽

DINCA LAURENTIU CHRISTIAN ◽

...

Keyword(s):

Mechanical Characteristics ◽

Water Vapor Permeability ◽

Color Difference ◽

Sem Analysis ◽

Point Of View ◽

Vapor Permeability ◽

Preliminary Treatment ◽

Textile Materials ◽

Chemical Agents ◽

Before And After

The objective of this study was to investigate the behavior in finishing of textile materials made of man-made fibers containing ZnO in blends with cotton. It has been studied the possibilities of reducing the concentration of the chemical agents considered to be aggressive for the functional textile fibers, the temperature and the duration of the processes, as well as the number of technological operations performed, so that the dyeing quality will not suffer and the dyed samples to be acceptable from the uniformity and fastness point of view. To highlight the influence of the chemical auxiliaries used in finishing operations, the process temperature, pH and the treatment duration on the phys - ical-chemical and physical-mechanical characteristics of the functional fibers, various methods of preliminary treatment and dyeing were applied in different experimental variants. In order to assess the preliminary treatments performance from whiteness degree and hydrophilicity point of view, the fabrics were tested before and after preliminary treatments. Finished fabrics (preliminary treated and dyed) were tested for the efficiency of the performed treatments in terms of color difference attributes and color fastness. The finished fabrics were also characterized in terms of the main physical-chemical and physical-mechanical characteristics: mass, tensile strength, tearing strength, water vapor permeability, air permeability. SEM analysis was used to investigate the surface morphology of treated fabrics. Antibacterial activity of treated samples was tested against the Staphylococcus aureus test strain.

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Effect of Acetone and Kerosene on Skin Ultrastructure

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100093717 ◽

1972 ◽

Vol 30 ◽

pp. 92-93

Author(s):

A. P. Lupulescu ◽

H. Pinkus ◽

D. J. Birmingham

Keyword(s):

Electron Microscopy ◽

Human Skin ◽

Osmium Tetroxide ◽

Human Epidermis ◽

Ultrastructural Changes ◽

Chemical Agents ◽

Skin Ultrastructure ◽

Volar Surface

Our laboratory is engaged in the study of the effect of different chemical agents on human skin, using electron microscopy. Previous investigations revealed that topical use of a strong alkali (NaOH 1N) or acid (HCl 1N), induces ultrastructural changes in the upper layers of human epidermis. In the current experiments, acetone and kerosene, which are primarily lipid solvents, were topically used on the volar surface of the forearm of Caucasian and Negro volunteers. Skin specimens were bioptically removed after 90 min. exposure and 72. hours later, fixed in 3% buffered glutaraldehyde, postfixed in 1% phosphate osmium tetroxide, then flat embedded in Epon.

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