Composition design of the optimum bloating activation condition for artificial lightweight aggregate using coal ash

다국어 초록 (Multilingual Abstract)

This study analyzed the characteristics of reject ash and bottom ash as raw materials for lightweight aggregate and suggested an optimum mixing ratio for recycling coal ash. The physical and chemical properties of reject ash and bottom ash for the manufacture of lightweight aggregate were examined. Rapid sintering tests were conducted to find an optimum mixing ratio to produce lightweight aggregates, density was measured, and cross-sections were observed. XRD-CT analysis was performed to observe the crystal phase distribution of the lightweight aggregate. Aggregate was sintered in a pilot rotary kiln using the optimum mixing ratio obtained through the experiment and its properties were measured. Coal ash has been found to be an unsuitable raw material for producing lightweight aggregate. By adding 3 wt% of carbon and 5 wt% of Fe2O3 to the bottom ash-dredged soil mixture, it was possible to prevent the adhesion of aggregate at the bloating activation temperature by lowering the firing temperature. Aggregates manufactured in the pilot rotary kiln meet the relevant standards and exhibit properties similar to those of commercial aggregates.

참고문헌 (Reference)

1 강신휴, "폐유리를 재활용한 인공경량골재의 발포기구" 한국세라믹학회 47 (47): 445-449, 2010

2 이기강, "철분이 많이 함유된 석탄회의 발포거동" 한국결정성장학회 24 (24): 77-83, 2014

3 이기강, "잔사회를 이용한 인공경량골재의 발포기구" 한국결정성장학회 22 (22): 158-163, 2012

4 김유택, "인공경량골재의 소성조건이 블랙코어에 미치는 영향" 한국결정성장학회 19 (19): 318-323, 2009

5 강민아, "석탄 잔사회 및 바닥재가 포함된 인공경량골재의 발포특성에 미치는 활성탄소의 영향" 한국결정성장학회 23 (23): 201-206, 2013

6 박지윤, "블랙코어 형성 메커니즘" 한국결정성장학회 15 (15): 208-215, 2005

7 "Yearbook of Energy Statistics 2018" Korea Energy Economics Institute 155-, 2018

8 O. V. Kaz’mina, "Viscosity evaluation for glass and glass crystal compositions in their foaming temperature range" 66 (66): 236-239, 2009

9 I. M. Anagnostopoulos, "Utilization of lignite power generation residues for the production of lightweight aggregates" 163 : 329-336, 2009

10 J. Monzo, "Use of sewage sludge ash(SSA)-cement admixtures in mortars" 26 (26): 1389-1398, 1996

11 M. C. Han, "Use of bottom ash and stone dust to make lightweight aggregate" 99 : 192-199, 2015

12 M. Aineto, "Thermal expansion of slag and fly ash from coal gasification in IGCC power plant" 85 (85): 2352-2358, 2006

13 G. Cougny, "Specifications for clayey raw materials used to produce expanded lightweight aggregates" 41 (41): 47-55, 1990

14 S. Köse, "Schaumbildung im system altglas-SiC und die eigenschaften derartiger schaumgläser" 55 (55): 151-160, 1982

15 C. M. Riley, "Relation of chemical properties to the bloating of clays" 34 (34): 121-128, 1951

16 C. Yang, "Recycling of low-silicon iron tailings in the production of lightweight aggregates" 41 : 1213-1221, 2015

17 K. Laursen, "Recycling of an industrial sludge and marine clay as lightweight aggregates" 80 (80): 208-213, 2006

18 N. Saikia, "Production of cement clinkers from municipal solid waste incineration(MSWI)fly ash" 27 (27): 1178-1189, 2007

19 Y. M. Wie, "Optimum condition for the unit process of an artificial lightweight aggregate using the Taguchi method" 7 (7): 331-341, 2019

20 Y. M. Wie, "Optimum bloating-activation zone of artificial lightweight aggregate by dynamic parameters" 12 (12): 267-, 2019

21 J. M. Moreno-Maroto, "Manufacturing of lightweight aggregates with carbon fiber and mineral wastes" 83 : 335-348, 2017

22 B. Ayati, "Manufacture and performance of lightweight aggregate from waste drill cuttings" 208 (208): 252-260, 2019

23 C. L. Hwang, "Manufacture and performance of lightweight aggregate from municipal solid waste incinerator fly ash and reservoir sediment for self-consolidating lightweight concrete" 34 (34): 1159-1166, 2012

24 F. Abd EL-Raoof, "Lightweight aggregates from mixtures of granite wastes with clay" 117 : 139-149, 2016

25 "KS L 5405: Fly ash"

26 "KS F 2527 Concrete aggregate"

27 "KS F 2503: Testing method for density and absorption of coarse aggregate"

28 G. Joseph, "Influence of fly ash on strength and sorption characteristics of cold-bonded fly ash aggregate concrete" 23 : 1862-1870, 2009

29 T. Kim, "Fly ash particle characterization for predicting concrete compressive strength" 165 : 560-571, 2018

30 J.H. Kim, "Efflorescence and leaching behavior of metal ions for EAF dust-clay based bricks" 449–452 : 241-244, 2004

31 S. H. Kang, "Effects of chemicophysical properties of carbon on bloating characteristics of artificial lightweight aggregates using coal ash" 232 : 35-42, 2012

32 Y. L. Wei, "Effect of waste glass addition on lightweight aggregates prepared from F-class coal fly ash" 112 : 773-782, 2016

33 Y. L. Wei, "Effect of waste glass addition on lightweight aggregates prepared from F-class coal fly ash" 112 : 773-782, 2016

34 S. Mu, "Effect of shale addition on properties of sintered coal fly ash" 25 : 617-622, 2011

35 J. Guo, "Effect of SiO2and Al2O3on characteristics of lightweight aggregate made from sewage sludge and river sediment" 44 (44): 4313-4319, 2017

36 K. S. Al-Jabri, "Copper slag as sand replacement for high performance concrete" 31 : 483-488, 2009

37 K. H. Lee, "Bloating mechanism of lightweight aggregate due to ramping rate" 2019 : 1-12, 2019

38 Ki Gang Lee, "Bloating Mechanism of Lightweight Aggregate with the Size" 한국세라믹학회 53 (53): 241-245, 2016

39 이기강, "Bloating Mechanism for Artificial Light Weight Aggregate of Surface Modification with Coal ash" 한국세라믹학회 52 (52): 159-164, 2015

40 S.G. Kang, "Artificial light-weight aggregates made of ceramic oxides to prevent sticking phenomenon"

41 C. H. Huang, "Application of water treatment sludge in the manufacturing of lightweight aggregate" 43 : 174-183, 2013

42 M. V. Madurwar, "Application of agro-waste for sustainable construction materials : a review" 38 : 872-878, 2013

43 Y. Li, "Analysis of MSWI bottom ash reused as alternative material for cement production" 31 : 549-553, 2016