INFLUENCE OF FLY ASH FROM CO-COMBUSTION OF COAL AND BIOMASS ON SCALING RESISTANCE OF CONCRETE

被引:5
作者
Kosior-Kazberuk, M. [1 ]
Jozwiak-Niedzwiedzka, D. [2 ]
机构
[1] Bialystok Tech Univ, Fac Civil Engn & Environm Engn, Bialystok, Poland
[2] Polish Acad Sci, Inst Fundamental Technol Res, Warsaw, Poland
关键词
concrete; durability; fly ash from co-combustion of coal and biomass; scaling resistance; microstructure;
D O I
10.2478/v.10169-010-0013-x
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Industrial utilization of fly ash from various kinds of fuel plays an important role in the environmentally clean and cost effective power production. The primary market for fly ash utilization is as a pozzolanic addition in concrete production. The paper concerns the concretes containing fly ash called Fly Ash from Biomass (FAB) from co-combustion of hard coal and wood biomass (wood chips). Characterization of the fly ash was carried on by means of X-ray diffractometry and E-SEM/EDS analysis. The results of laboratory studies undertaken to evaluate the influence of FAB on concrete resistance to surface scaling due to cyclic freezing and thawing in the presence of NaCl solution were presented. The tests were carried out for concretes containing up to 25% of fly ash related to cement mass. Additionally, the microstructure of air- voids was described. It was concluded that the FAB has significant effect on concrete freeze/ thaw durability. The replacement of cement by fly ash from co- combustion progressively transformed the concrete microstructure into less resistant against freeze/thaw cycles and excessive dosage (over 15%) may dangerously increase the scaling.
引用
收藏
页码:239 / 254
页数:16
相关论文
共 16 条
[1]  
[Anonymous], 2006, 45012006 EN, P33
[2]  
[Anonymous], 2003, 20612003 PNEN, P101
[3]  
[Anonymous], 2007, 1239092007 PKNCENTS
[4]  
[Anonymous], 2008, PNEN480112008
[5]  
[Anonymous], 1996, 55 HETEK
[6]  
Brandt A.M., 2003, DIAGNOSIS CONCRETE H, V218
[7]  
Brandt A.M., 2009, CEMENT BASED COMPOSI, P526
[8]   Influence of fly ash fineness on the chloride penetration of concrete [J].
Chindaprasirt, P. ;
Chotithanorm, C. ;
Cao, H. T. ;
Sirivivatnanon, V. .
CONSTRUCTION AND BUILDING MATERIALS, 2007, 21 (02) :356-361
[9]   Effects of biomass co-firing with coal on ash properties. Part I: Characterisation and PSD [J].
Grammelis, P. ;
Skodras, G. ;
Kakaras, E. .
FUEL, 2006, 85 (16) :2310-2315
[10]   Scaling resistance of high performance concretes containing a small portion of pre-wetted lightweight fine aggregate [J].
Józwiak-Niedzwiedzka, D .
CEMENT & CONCRETE COMPOSITES, 2005, 27 (06) :709-715