The strength properties of alkali-activated silica fume mortars

다국어 초록 (Multilingual Abstract)

In this study, the strength properties of alkali-activated silica fume (SF) mortars were investigated. The crushed limestone sand with maximum size of 0-5 mm and the sodium meta silicate (Na2SiO3) used to activate the binders were kept constant in the mortar mixtures. The mortar specimens using the replacement ratios of 0, 25, 50, 75 and 100% SF by weight of cement together with Na2SiO3 at a constant rate were produced in addition to the control mortar produced by only cement. Moreover, the mortar specimens using the replacement ratio of 4% titanium dioxide (TiO2) by weight of cement in the same mixture proportions were produced. The prismatic specimens produced from eleven different mixtures were de-moulded after a day, and the wet or dry cure was applied on the produced specimens at laboratory condition until the specimens were used for flexural strength (ffs) and compressive strength (fc) measurement at the ages of 7, 28 and 56 days. The ffs and fc values of mortars applied the wet or dry cure were compared with the results of control mortar. The findings revealed that the fc results of the alkali activated 50% SF mortars were higher than that of mortar produced with Portland cement only. It was found that the ffs and fc of alkali-activated SF mortars cured in dry condition was averagely 4% lower than that of alkali-activated SF mortars cured in wet condition.

참고문헌 (Reference)

1 Yang, K. H., "Workability loss and compressive strength development of cementless mortars activated by combination of sodium silicate and sodium hydroxide" 21 (21): 119-127, 2009

2 Chindaprasirt, P., "Workability and strength of coarse high calcium fly ash geopolymer" 29 (29): 224-229, 2007

3 Collins, F. G., "Workability and mechanical properties of alkali activated slag concrete" 29 (29): 455-458, 1999

4 Oh, J. E., "The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers" 40 (40): 189-196, 2010

5 Bakharev, T., "Sulfate attack on alkali-activated slag concrete" 32 (32): 211-216, 2002

6 Bakharev, T., "Resistance of alkali-activated slag concrete to acid attack" 33 (33): 1607-1611, 2003

7 Bayasi, Z., "Properties of silica fume concrete and mortar" 90 (90): 349-356, 1993

8 El-didamony, H., "Properties and durability of alkali-activated slag pastes immersed in sea water" 38 (38): 3773-3780, 2012

9 Han, S. H., "Prediction of compressive strength of fly ash concrete by new apparent activation energy function" 33 (33): 965-971, 2003

10 Pilvar, A., "Practical evaluation of rapid tests for assessing the chloride resistance of concretes containing silica fume" 18 (18): 793-806, 2016

11 Khalifeh, M., "Potential utilization of class C fly ash-based geopolymer in oil well cementing operations" 53 : 10-17, 2014

12 Hardjito, D., "On the development of fly ash-based geopolymer concrete" 101 (101): 467-472, 2004

13 "Methods of Test for Mortar for Masonry-Part 11: Determination of Flexural and Compressive Strength of Hardened Mortar"

14 Puertas, F., "Mechanical and durable behaviour of alkaline cement mortars reinforced with polypropylene fibres" 33 (33): 2031-2036, 2003

15 Shi, C., "Interface between cement paste and quartz sand in alkali activated slag mortars" 28 (28): 887-896, 1998

16 Atiş, C. D., "Influence of activator on the strength and drying shrinkage of alkali-activated slag mortar" 23 (23): 548-555, 2009

17 İlter, E., "Efficiency of silica fume in the high dosage concretes with CEM I 42,5 cement" Istanbul Technical University 2007

18 Zivica, V., "Effects of type and dosage of alkaline activator and temperature on the properties of alkali-activated slag mixtures" 21 (21): 1463-1469, 2007

19 Krizan, D., "Effects of dosage and modulus of water glass on early hydration of alkali-slag cements" 32 (32): 1181-1188, 2002

20 Toutanji, H., "Effect of supplementary cementitious materials on the compressive strength and durability of short-term cured concrete" 34 (34): 311-319, 2004

21 Mazloom, M., "Effect of silica fume on mechanical properties of high-strength concrete" 26 (26): 347-357, 2004

22 Bernal, S., "Effect of binder content on the performance of alkali-activated slag concretes" 41 (41): 1-8, 2011

23 "Design of Concrete Mixes"

24 Erdoğan, T. Y., "Concrete" Metu Press 741-, 2003

25 Fernandez-jimenez, A., "Composition and microstructure of alkali activated fly ash binder : Effect of the activator" 35 (35): 1984-1992, 2005

26 Roy, D. M., "Chloride diffusion in ordinary, blended, and alkali-activated cement pastes and its relation to other properties" 30 (30): 1879-1884, 2000

27 "Cement-Part 1: Compositions and Conformity Criteria for Common Cements"

28 Jayanthi, S. J., "Assessment of strength and durability of bagasse ash and silica fume concrete" 17 (17): 801-814, 2016

29 Fernandez-Jimenez, A., "Alkali-activated slag mortars-mechanical strength behavior" 29 (29): 1313-1321, 1999

30 Guo, X., "Alkali-activated complex binders from class C fly ash and ca-containing admixtures" 173 (173): 480-486, 2010

31 Shi, C., "Alkali-Activated Cements and Concretes" Taylor and Francis 2006

32 Bakharev, T., "Alkali activation of Australian slag cements" 29 (29): 113-120, 1999

33 Wang, S. D., "Alkali activated slag cement and concrete : A review of properties and problems" 7 (7): 93-102, 1995

34 Pacheco-Torgal, F., "Alkali activated binders : A review. Part II : About materials and binder manufacture" 22 (22): 1305-1314, 2008

35 "Admixtures for Concrete, Mortar and Grout-Part 2: Concrete Admixtures-Definitions, Requirements, Conformity, Marking and Labelling"

36 "ASTM C 494-99a; Standard Specification for Chemical Admixtures for Concrete"

37 Serdar, A., "A ternary optimisation of mineral additives of alkali activated cement mortars" 43 : 131-138, 2013