Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds

Various sizes of high-density biomass briquette, named ‘Bio-coke,’ were produced from spent green tea grounds. The mechanical properties at room temperature of the Bio-coke samples were investigated using a compression testing machine. From the results, the relationship between the specimen size of...

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Autores principales:	Satoru MIZUNO, Tamio IDA, Manabu FUCHIHATA, Kunihiko NAMBA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	bio-coke room temperature environment ultimate compressive strength size effect thickness of permeation zone Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/ce175302d85a4d828293501d4bbc0b21
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spelling	oai:doaj.org-article:ce175302d85a4d828293501d4bbc0b212021-11-26T06:35:12ZEffect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds2187-974510.1299/mej.15-00441https://doaj.org/article/ce175302d85a4d828293501d4bbc0b212016-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/1/3_15-00441/_pdf/-char/enhttps://doaj.org/toc/2187-9745Various sizes of high-density biomass briquette, named ‘Bio-coke,’ were produced from spent green tea grounds. The mechanical properties at room temperature of the Bio-coke samples were investigated using a compression testing machine. From the results, the relationship between the specimen size of Bio-coke and the ultimate compressive strength at room temperature showed that the ultimate compressive strength depends on the specimen size of Bio-coke. The maximum value of the ultimate compressive strength among the different specimen sizes of Bio-coke was at 67 MPa, obtained from the 12-mm diameter sample. In addition, at 12 mm diameter or smaller, there is hardly any difference in the ultimate compressive strengths measured. Hence, the cold compressive strength properties are divided into two groups based on the uniformity of the structure of the main components along the horizontal cross section of a Bio-coke. Results indicate that the state of the structure, composed of cellulose, hemi-cellulose, and lignin, appears to be consistent resulting from uniform permeation conditions at the 12-mm diameter or smaller samples. Meanwhile, at diameters of 20 mm or larger, the condition of the periphery of the samples were not consistent with that of the middle region because of the temperature, stress gradient and number of void occurring inside the Bio-coke caused by specimen size effect.Satoru MIZUNOTamio IDAManabu FUCHIHATAKunihiko NAMBAThe Japan Society of Mechanical Engineersarticlebio-cokeroom temperature environmentultimate compressive strengthsize effectthickness of permeation zoneMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 1, Pp 15-00441-15-00441 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	bio-coke room temperature environment ultimate compressive strength size effect thickness of permeation zone Mechanical engineering and machinery TJ1-1570
spellingShingle	bio-coke room temperature environment ultimate compressive strength size effect thickness of permeation zone Mechanical engineering and machinery TJ1-1570 Satoru MIZUNO Tamio IDA Manabu FUCHIHATA Kunihiko NAMBA Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds
description	Various sizes of high-density biomass briquette, named ‘Bio-coke,’ were produced from spent green tea grounds. The mechanical properties at room temperature of the Bio-coke samples were investigated using a compression testing machine. From the results, the relationship between the specimen size of Bio-coke and the ultimate compressive strength at room temperature showed that the ultimate compressive strength depends on the specimen size of Bio-coke. The maximum value of the ultimate compressive strength among the different specimen sizes of Bio-coke was at 67 MPa, obtained from the 12-mm diameter sample. In addition, at 12 mm diameter or smaller, there is hardly any difference in the ultimate compressive strengths measured. Hence, the cold compressive strength properties are divided into two groups based on the uniformity of the structure of the main components along the horizontal cross section of a Bio-coke. Results indicate that the state of the structure, composed of cellulose, hemi-cellulose, and lignin, appears to be consistent resulting from uniform permeation conditions at the 12-mm diameter or smaller samples. Meanwhile, at diameters of 20 mm or larger, the condition of the periphery of the samples were not consistent with that of the middle region because of the temperature, stress gradient and number of void occurring inside the Bio-coke caused by specimen size effect.
format	article
author	Satoru MIZUNO Tamio IDA Manabu FUCHIHATA Kunihiko NAMBA
author_facet	Satoru MIZUNO Tamio IDA Manabu FUCHIHATA Kunihiko NAMBA
author_sort	Satoru MIZUNO
title	Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds
title_short	Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds
title_full	Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds
title_fullStr	Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds
title_full_unstemmed	Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds
title_sort	effect of specimen size on ultimate compressive strength of bio-coke produced from green tea grounds
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/ce175302d85a4d828293501d4bbc0b21
work_keys_str_mv	AT satorumizuno effectofspecimensizeonultimatecompressivestrengthofbiocokeproducedfromgreenteagrounds AT tamioida effectofspecimensizeonultimatecompressivestrengthofbiocokeproducedfromgreenteagrounds AT manabufuchihata effectofspecimensizeonultimatecompressivestrengthofbiocokeproducedfromgreenteagrounds AT kunihikonamba effectofspecimensizeonultimatecompressivestrengthofbiocokeproducedfromgreenteagrounds
_version_	1718409808156033024

Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds

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