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Investigation of the mechanical and hygrothermal behavior of coffee ground wastes valorized as a building material: analysis of mix designs performance and sorption curve linearization effect

Hamdaoui Mohamed Ali, Benzaama Mohammed-Hichem, El Mendili Yassine, Chateigner Daniel, Gascoin Stéphanie

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 1

art. no. e57, 2023

EN

Coffee ground wastes (CGW) are by-products from the coffee-making processes. In this study, we propose to valorize them in construction materials at large scale. In particular, we investigate the mechanical and hygrothermal performances of earthen cob construction with incorporation of various amounts of CGW. Our results indicate that adding coffee grounds to cob enhances its hygrothermal performances as well as its compressive strength. An interesting enhancement of the lightened earth thermal characteristics as well as a good control of the hydric load in the air while maintaining acceptable mechanical properties is observed. Numerical analysis is used to evaluate the hygrothermal behavior of cob specimens to better understand their energy performances. A simplification of the simulation methods using a linearization of the sorption curve is incorporated to reduce calculation times and optimize outputs. The method is validated using experimental data, which shows a promising improvement compared to previous approaches. The proposed method can be faithfully applied to the study of hygrothermal behavior of biomaterials, which is strongly related to the building energy performance and the investigation of their durability in a fast and effcient way.

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Value added of intellectual capital in banks and the hysteresis effect

Smuda-Kocoń Marlena

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2019

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z. 136

551--563

EN

The aim of this paper is to contribute to the identification, illustration and description of patterns in the Value Added Intellectual Capital for banks in the long term. The study is part of the discussion on contemporary measures of organisational success and sources of value creation. Based on the subject literature, it is hypothesised that intellectual capital creates added value with some delay due to the operation of various external stimuli (e.g. financial market turbulence, economic slowdown), which may be explained in a logically coherent way using the hysteresis effect. The analysis covers empirical material obtained during broader research on a sample of banks listed on the Warsaw Stock Exchange in the years 2007-2017. As results of the study show, over the last decade, banks have evidently recorded the creation of added value in connection with the held intellectual capital resources. Its growth should, however, be interpreted with a large degree of caution. The occurrence of turbulence on the financial markets in the years 2007-2009 was not without impact on the results obtained.

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An Experimental Study on Thickness Loss of Wilton Type Carpets Produced with Different Pile Materials after Prolonged Heavy Static Loading. Part 2, Energy Absorption and Hysteresis Effect

Celik N., Koc E.

Fibres & Textiles in Eastern Europe

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2007

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Vol. 15, no. 3 (62)

87--92

EN

In the first part of the article, an evaluation was made of the characteristic parameters defined as the squeezing susceptibility or compression sensitivity S, permanent deformation DP, elasticity E and resilience R, all quantities expressed in per cent, which determine the behaviours of carpets of different pile materials (wool, acrylic and PP). This second part consists of an extended analysis covering the energy absorption, work done on the carpet, damping characteristics and hysteresis effect of pile materials on the behaviours of carpet during recovery after unloading the static pressure. Therefore, some more definitions are also presented, such as the rigidity coefficient, withdrawal force, total energy, elastic energy, damping energy, elastic recovery coefficient, damping coefficient and decompression coeff-icient. Throughout the paper, these parameters are specifically symbolised and explained for each carpet, and the results are discussed at the end.

PL

W pierwszej części artykułu oceniono charakterystyczne parametry, określone jako podatność na ściskanie S, stałą deformację Dp, elastyczność E, oraz odprężność R, wszystkie wyrażone w procentach, określające zachowanie się dywanów o różnych materialach okrywy, takich jak wełna, akryl i polipropylen. Druga część przedstawia poszerzoną analizę dotyczącą absorpcji energii, pracy wykonanej przez dywan, charakterystyk tłumienia oraz efektu histerezy materiału okrywy podczas odprężania dywanu po ustaniu jego statycznego obciążenia. Do analizy wprowadzono dalsze parametry, określone pojęciami takimi jak współczynnik sztywności, całkowita energia, energia elastyczna, energia tłumienia, współczynnik elastycznej odprężności, współczynnik tłumienia i dekompresji. Przeprowadzono analizę tych parametrów dla poszczególnych dywanów.