The role of pore structure in sound absorption performance of lime based plasters

2015-08-09
Sound absorption performance is directly related to the pore structure of materials. The effect of materials' pore characteristics on sound absorption performance has been examined in detail, especially for materials like mineral wool, foamed metals, porous concrete, sand and soils. However, there is scarcity of knowledge in literature on relationships between sound absorption characteristics of lime-based plasters used as finishing layer(s) in buildings and their pore structure. In this study sets of lime-based plaster samples, composed of non-hydraulic lime as the binder, various binder/aggregate ratios and aggregate size distribution, were prepared in the laboratory. Basic physical and physico-mechanical properties of plasters were defined in terms of density, open porosity and ultrasonic velocity. Sound absorption characteristics of plaster samples were measured by the impedance tube method. Pore structures of the samples were analyzed in terms of pore shape and pore size through image analyses of their cross sections. Correlations between the parameters related with the pore structure and sound absorption were evaluated to reveal major porosity characteristics contributing to different sound absorption behavior at certain frequencies

Suggestions

The effect of different solvents on the performance of zeolite-filled composite pervaporation membranes
Sener, Tansel; Okumus, Emin; Gurkan, Turker; Yılmaz, Levent (2010-10-15)
The aim of this research is to study effect of different solvents on the membrane morphology and on the performance of zeolite-filled composite pervaporation membranes. PAN (polyacrylonitrile) was used as a base polymer and zeolite 13x (32 wt.%) was used as the filler. The solvents considered were DMF (dimethyl formamide), DMSO (dimethyl sulfoxide), DMAc (dimethyl acedamide) and THF (tetrahydrofuran). The cross-sectional morphology of manufactured membranes shows three layers: a zeolite-free polymer layer, ...
Effect of preparation parameters on performance of dense homogeneous polycarbonate gas separation membranes
Hacarlioglu, P; Toppare, Levent Kamil; Yılmaz, Levent (Wiley, 2003-10-17)
The aim of this study is to determine the effect of preparation parameters on the membrane permeation mechanism and separation performances of dense homogeneous poly(bisphenol A carbonate) (PC) membranes. Blade-casting and drop-casting techniques are used for casting films from solutions with varying concentrations. Chloroform and methylene chloride are used to determine the effect of the properties of the casting solvent. Permeation measurements are done with Ar, N-2, O-2, CH4, CO2, and H, gases. The selec...
An experimental study on off-design performance and noise in small pumps
Şahin, Fatma Ceyhun; Eralp, O. Cahit; Department of Mechanical Engineering (2007)
This thesis study is focused on experimentally investigating pump noise at design and off-design operations and its relations with pressure fluctuations. Small size pumps are placed in a semi-anechoic chamber and operated at various system conditions and various rotational pump speeds. Pump operational data, noise data and time dependent pressure data are recorded. Fast Fourier Transform spectra of noise and pressure data are compared. Coherence spectrum between sound pressure level and hydraulic pressures ...
The effect of hot-deformation on mechanical properties and age hardening characteristics of Al-Mg-Si based wought aluminum alloys
Tan, Evren; Ögel, Bilgehan; Department of Metallurgical and Materials Engineering (2006)
Microstructural and mechanical characterizations of heat treatable Al-Mg-Si-Cu based wrought aluminum alloys have been studied. The aim of this work was to produce fine grained, high strength alloy by adjusting processing conditions: deformation, solutionizing and aging. First, primary characterization was carried out via SEM-EDS analyses and tensile tests. Then an extensive experimental study has been carried out on two sets of samples. The first set has been studied to determine the ideal conditions for s...
Effect of heat treatment on microstructural and mechanical properties of molybdenum based PM ferrous alloys
Davoudnezhad, Ramona; Ögel, Bilgehan; Durlu, Nuri; Department of Metallurgical and Materials Engineering (2016)
In this study, the effect of different heat treatment processes on microstructural and mechanical properties of Distaloy-DH and Astaloy Mo (Fe-2Cu-1.5Mo) powders are investigated. Powder samples are sintered at 1120°C for 45 minutes in a sintering furnace under reducing atmosphere of: 10% H2 + 90% N2. After sintering, secondary heat treatments are performed on samples. Microstructural characterization of samples is done with optical and electron microscopy. Selective etching is utilized for determining the ...
Citation Formats
I. Meric Nursal, A. Tavukçuoğlu, and M. Çalışkan, “The role of pore structure in sound absorption performance of lime based plasters,” INTER-NOISE 2015 - 44th International Congress and Exposition on Noise Control Engineering (2015), 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/71598.