In this study, nano-SiO2 has been used as a high reactive pozzolan to develop the microstructure of the interfacial transition zone between the cement paste and the aggregate. Mechanical tests of blended cement-based concretes exposed that in addition of the pozzolanic reactivity of nano-SiO2 (chemical aspect), its particle grading (physical aspect) also revealed considerable influences on the blending effectiveness. It was concluded that the relative permeability reduction (relative to the control concrete made with plain cement) is higher for coarser nano-SiO2 after 90 days of moisture curing. However, finer nano-SiO2 particles showed better effects in early ages. These phenomena can be due to the free spacing between mixture particles that was associated with the global permeability of the blended cement-based concretes. This article presents the results of the effects of particle size ranges involved in nano-SiO2 blended Portland cement on the water permeability of concrete. It is revealed that the favorable results for coarser nano-SiO2 reflect enhanced particle packing formation accompanied by a reduction in porosity and particularly in particle spacing after 90 days.
Birgisson B.Nano-modification of cement paste to improve bulk properties of concrete . In: The National Science Foundation Workshop on Nano-modification of Cementitious Materials, University of Florida, Gainesville, 8-11 August, 2006.
2.
ASTM International.ASTM E2456: Standard terminology relating to nanotechnology. West Conshohocken, PA: ASTM, 2006.
3.
He X. and Shi X.Chloride permeability and microstructure of Portland cement mortars incorporating nanomaterials (Transportation Research Record). Journal of the Transportation Research Board2008; 2070: 13-21.
4.
Li H., Xiao HG, Yuan J. and Ou J.Microstructure of cement mortar with nano-particles. Composites Part B2003; 35: 185-189.
5.
Jo BW, Kim CH, Tae G. and Park JBCharacteristics of cement mortar with nano-SiO2 particles. Const Build Mater2007; 21(6): 1351-1355.
6.
Sorelli L., Constantinides G., Ulm FJ and Toutlemonde F.The nano-mechanical signature of ultra high performance concrete by statistical nano indentation techniques. Cem Concr Res2008; 38: 1447-1456.
7.
Monteiro PJM and Mehta PKImprovement of the aggregate cement paste transition zone by grain refinement of hydration product. In: Proceedings of the 8th International Congress on the Chemistry of Cement, Vol. 2, Rio-de-Jeneiro, 1986 , pp. 433-437.
8.
Li H., Zhang M. and Ou J.Abrasion resistance of concrete containing nano-particles for pavement . Wear2006; 260: 1262-1266.
9.
Naji Givi A. , Abdul Rashid S., Aziz FN and Mohd Salleh MAThe effects of limewater on properties of SiO2 nano-particles binary blended concrete . Compos: Part B2010, doi:10.1016/j.compositesb.2010.10.002.
10.
Ji T.Preliminary study on the water permeability and microstructure of concrete incorporating nano-SiO2. Cem Concr Res2005 ; 35(10): 1943-1947.
11.
Lia Z., Wanga H., Hea S., Lua Y. and Wangb M.Investigations on the preparation and mechanical properties of the nano-alumina reinforced cement composite. Mater Lett2006 ; 60(3): 356-359.
12.
Shih J., Chang T. and Hsiao T.Effect of nanosilica on characterization of Portland cement composite . Mater Sci Eng A2006; 424(1-2): 266-274.
13.
Kosmatka SH , Kerkhoff B. and Panarese WCDesign and control of concrete mixtures . Skokie, IL: Portland cement association, 2002.
14.
Naji Givi A. , Abdul Rashid S., Aziz FNA and Salleh MAM.Contribution of rice husk ash to the properties of mortar and concrete: a review. J Am Sci2010; 6(3): 157-165.
15.
Naji Givi A. , Abdul Rashid S., Aziz FNA and Salleh MAM.Assessment of the effects of rice husk ash particle size on strength, water permeability and workability of binary blended concrete. Constr Build Mater2010; 24: 2145-2150.
16.
Zivica V.Effects of the very low water/cement ratio. Constr Build Mater2009; 23(8): 2846-2850.
17.
Parichatprecha R., Subedi BP and Nimityongskul P.Influence of pozzolanic materials and cement content on the charge passed of high strength and durable concrete. J Ferrocem2006; 36(2): 799-807.
18.
Bui DD, Hu J. and Stroeven P.Particle size effect on the strength of rice husk ash blended gap-graded Portland cement concrete. Cem Concr Compos2005; 27(3): 357-366.
19.
Martys NS and Ferraris CFCapillary transport in mortars and concrete. Cem Concr Res1997; 27(5): 747-760.
20.
Ransinchung GD, Kumar B. and Kumar V.Assessment of water absorption and chloride ion penetration of pavement quality concrete admixed with wollastonite and microsilica. Const Build Mater2009; 23(2): 1168-1177.
21.
Ganesan K., Rajagopal K. and Thangavel K.Rice husk ash blended cement: assessment of optimal level of replacement for strength and permeability properties of concrete. Constr Build Mater2008; 22(8): 1675-1683.
22.
Powers TCProperties of fresh concrete. New York: John Wiley and Sons, 1968.
23.
Li H., Xiao H. and Ou J.A study on mechanical and pressure-sensitive properties of cement mortar with nanophase materials. Cem Concr Res2004; 34(3): 435-438.
24.
Massazza F.The role of the additions to cement in the concrete durability. Cemento1987; 84: 359-382.
25.
National Material Advisory Board.Concrete durability: a multi-billion dollar opportunity. NMAB-437. Washington, DC: National Academy Press, 1987 .
26.
Porter DA and Easteriing KEPhase transformation in metals and alloys, 2nd ed. London: Chapman Hall, 1992.
27.
Müller I.A history of thermodynamics: the doctrine of energy and entropy. Berlin, Heidelberg , Germany: Springer Verlag, 2007 .
28.
Baierlein R.Thermal physics. Cambridge : Cambridge University Press, 2003 .
29.
Reiss H.Methods of thermodynamics. Mineola, New York: Dover Publications, 1965 .
Tasdemir C.Combined effects of mineral admixtures and curing conditions on the sorptivity coefficients of concrete. Cem Concr Res2003; 33: 1637-1642.
32.
Wee TH, Suryavanshi JA and Tin SSEvaluation of rapid chloride permeability test (RCPT) results for concrete containing mineral admixtures. ACI Mater J2000; 97(2): 221-232.
