Browse > Article

A comparison of fracture rate of artificial light-weight aggregates by various drying, breaking, and forming methods  

Park Jiyun (Department of Materials Engineering, Kyonggi University)
Kim Yootaek (Department of Materials Engineering, Kyonggi University)
Lee Ki-Gang (Department of Materials Engineering, Kyonggi University)
Kang Seunggu (Department of Materials Engineering, Kyonggi University)
Kim Jung-Hwan (Department of Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.15, no.1, 2005 , pp. 39-44 More about this Journal
Abstract
A sheet type of green body was made with the mixture of 60 wt% red clay, 20 wt% fly ash, and 20 wt% stone sludge. Indentations were made on the surfaces of sheets to investigate fracture rate of 1 to 5 mm artificial light-weight aggregates by various drying, breaking, and forming methods. Drying methods of green bodies were natural, electric oven, microwave, and fast drying by torch. Breaking methods of green bodies were ballmill Ⅰ, ballmill Ⅱ, free dropping in the box, and mechanical breaking with roller mill. The depth and width of indent on the surface of the sheet were varied and the thickness of green bodies was also changed to investigate effects of indentation on fracture rates. The highest fracture rate of 42 % among the various drying methods was obtained by microwave drying for 210 sec and the highest fracture rate of 65 % among the various breaking method was obtained by ballmill Ⅱ method. In forming method, an yield of larger aggregates than Ф = 5 mm decreased and that of smaller aggregates than Ф = 5 mm in creased with increasing depth of indentation (only in 3 mm thick green body)and with increasing thickness of green body. The size of aggregates was most homogeneous (by judging from the measurement of aspect ratio of 1 to 5 mm aggregates.) when 3 mm thick green body was rapidly dried by torch and was broken by ballmill Ⅱ method.
Keywords
Artificial light-weight aggregates; Fracture rate; Indentation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 K.G. Babu and D.S. Babu, 'Performance of fly ash concretes containing lightweight EPS aggregates', Cement & Concrete Composites 26 (2004) 605   DOI   ScienceOn
2 M. Husem, 'The effects of bond strengths between lightweight and ordinary aggregate-mortar, aggregate-cement paste of the mechanical properties of concrete', Materials Science and Engineering A363 (2003) 152
3 R. de Gennaro, P. Cappelletti, G. Cerri, M. de'Gennaro, M. Dondi and A. Langella, 'Neapolitan yellow tuff as raw material for lightweight aggregates in lightweight structural concrete production', Applied Clay Science (2004) (to be published)
4 Y.B. Chai, 'Materials mineral of lightweight aggregates', Mineral and Industry 3(1) (1990)
5 M. Gesoglu, T. Ozturan and E. Guneyisi, 'Shrinkage cracking of lightweight concrete made with cold-bonded fly ash aggregate', Cement & Concrete Research 34(7) (2004) 1121
6 T.Y. Lo and H.Z. Cui, 'Effect of porous lightweight aggregate of strength of concrete', Materials Letters 58 (2004) 916   DOI   ScienceOn
7 D. Sari and A.G. Pasamehmetoglu, 'The effect of gradation and admixture on the pumice lightweight aggregate concrete', Cement & Concrete Research (2004) (to be published)
8 T.Y. Lo, H.Z. Cui and Z.G. Li, 'Influence of aggregate pre-wetting and fly ash on mechanical properties of lightweight concrete', Waste Management 24(4) (2004) 333
9 M.N. Haque, H.Al. Khaiat and O. Kayali, 'Strength and durability of lightweight concrete', Cement & Concrete Composites 26 (2004) 307   DOI   ScienceOn
10 Y.M. Ko, N.W. Lee, J.W. Choi, H.C. Woo and H.G. Shin, 'A study on development of lightweight aggregate using industrial wastewater sludge', Journal of Korean Safety Society 17(1) (2002)