Sage Journals: Discover world-class research

Abstract

This paper reports the effects of nanosilica (nS), microsilica (silica fume, SF) and their simultaneous use (nS+SF) on “both” the microstructure of cement pastes and the mechanical properties of mortars. After water curing at 21°C for 7, 28 and 90 days, samples with water/binder w/b ratio of 0·35 were characterised by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and compressive strength test. Single or mixed mineral additions did not generate “any” distinct hydration phases compared to the reference material without additives. A decrease in the calcium hydroxide contents in later curing ages indicated a pozzolanic effect of nS and SF. The chemical action promoted by nS together with the physical effect due to the small particle size distribution given by SF result in higher compressive strength and better hardened properties, suggesting the synergistic action of nS+SF compared with single additions.

Keywords

Nanosilica Microsilica Cement Pastes Mortars

Get full access to this article

View all access options for this article.

References

Older

: ‘Lea's chemistry of cement and concrete‘, 4th edn; 2004, Oxford, Butterworth-Heinemann.

Taylor

H. F. W.

: ‘Cement chemistry’; 1990, New York, Academic Press.

Mehta

P. K.

and Monteiro

P. J. M.

: ‘Concrete — microstructure, properties, and materials’; 1993, New York, McGraw-Hill.

Davraz

and Gunduz

: Gem. Goner. Res., 2005, 35, 1251–1261.

Senff

, Hotza

, Repette

W. L.

, Ferreira

V. M.

and Labrincha

J. A.

: Adv. AppL Ceram., 2009, 108, 418–428.

Fukushi

and Sato

: Environ. Sci. Technol., 2005, 39,250–1256.

Bergna

H. E.

and Roberts

W.O.

: ‘Colloidal silica: fundamentals and applications’; 2006, New York, Taylor & Francis Group.

Iler

R. K.

: ‘The chemistry of silica: solubility, polymerization, colloid and surface properties and biochemistry’; 1979, New York, John Wiley.

Elimelech

, Williams

, Gregory

and Jia

: ‘Particle deposition and aggregation’; 1995, Oxford, Heinemann.

10.

Sakka

: ‘Handbook of sol—gel science and technology: processing, characterization, and applications’, 2005, Berlin, Springer.

11.

Sellergren

: ‘Molecularly imprinted polymers: man-made mimics of antibodies and their applications in analytical chemistry’; 2001, Amsterdam, Elsevier.

12.

Vo-Dinh

: ‘Protein nanotechnology: protocols, instrumentation and application’; 2005, Totowa, NJ, Humana Press.

13.

Park

C. K.

, Noh

M. H.

and Park

T. H.

: Gem. Goner. Res., 2005, 35, 842–849.

14.

Brinker

C. J.

and Scherer

G. W.

: ‘Sol—gel science: the physics and chemistry of sol—gel processing‘; 1989, Amsterdam, Elsevier Science.

15.

Podczeck

: ‘Particle—particle adhesion in pharmaceutical powder handling’, 1998, London, Imperial College Press.

16.

Yang

R. Y.

, Yu

A. B.

, Choi

S. K.

, Coates

M. S.

and Chan

H. K.

: Powder Technol., 2008, 184, 122–129.

17.

‘Cement: composition, specifications and conformity criteria for common cements’, EN

197–1, 2004.

18.

‘Methods of testing cement: determination of strength’, EN

196–1, 2005.

19.

‘Methods of test for mortar for masonry — part 11: determination of flexural and compressive strength of hardened mortar’, EN

1015–11, 1999.

20.

Wild

and Khatib

J. M.

: Gem. Goner. Res., 1997, 27, 137–46.

21.

Ramachandran

V. S.

and Beaudoin

J. J.

: ‘Handbook of analy-tical techniques in concrete science and technology: principles, techniques, and applications’; 2001, New York, Noyes/William Andrew.

22.

Powder diffraction file, card no. 41–1451, Joint Committee on Powder Diffraction Standards (JCPDS) , Swathmore, PA, USA, 1989.

23.

Powder diffraction file, card no . 5–0586, JCPDS, Swathmore, PA, USA, 1992.

24.

Powder diffraction file, card no . 55–0740, JCPDS, Swathmore, PA, USA, 2003.

25.

Powder diffraction file, card no. 1-072-1396, JCPDS, Swathmore, PA, USA , 1968.

26.

Powder diffraction file, card no. 1-083-0461, JCPDS, Swathmore, PA, USA , 1994.

27.

Powder diffraction file, card no.

44–1481, JCPDS, Swathmore, PA, USA, 1992.

28.

Powder diffraction file, card no.

46–1212, JCPDS, Swathmore, PA, USA, 1993.

29.

De Larrard

: ‘Concrete mixture proportioning: a scientific approach’: 1999, New York, Taylor & Francis.

30.

Mora

C. F.

and Kwan

A. K. H.

: Cem. Conc. Res., 2000, 30, 351–358.

31.

Furnas

C. C.

: Ind Eng. Chem., 1931, 23, 1052–1058.

32.

Wiesner

and Jean-Yves Bottero: ‘Environmental nanotechnology applications and impacts of nanomaterials’; 2007, New York, McGraw-Hill Companies.

Effect of nanosilica and microsilica on microstructure and hardened properties of cement pastes and mortars

Abstract

Keywords

Get full access to this article

References