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Microstructural Observation of Cement Particle Gro…
Author:VENKITEELAGiri SUNZhihui(CivilandEn… UniversityofLouisvil… Louisville KY40292 USA) 
Unit: 
Keyword:cement paste microstructure cement particle scanning electron microscope image 
Classification:TQ172.1
Year,volume(Issue):page number:2010,38(9):1613-1617
Summary:

Cement paste′s microstructure evolution is a complex phenomenon,which includes cement particle growth,agglomeration,flocculation and wide rage range of other reactions.It is important to know these behaviors of cement particles during hydration for better understanding of the early age cement based material properties.In-situ observations were made on three different cement pastes’ microstructures evolutions by employing Quantomix capsuling system in scanning electron microscopy.With the advantage of continuous observation on cement pastes microstructure developments using this system,single particle growth and connectivity between particles during hydration were then investigated.For this purpose,changes in gray level profiles(using image analysis) of cement particles were used,which could be obtained from image analysis of micrographs.Finally,cement particle growth and connectivity in these cement pastes were examined quantitatively.

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Foundation item:
美国国家自然科学基金(CMMI-0654263)资助项目
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References:

[1] POMMERSHEIM J M, CLIFTON J R. Mathematical modeling of tricalcium silicate hydration II. hydration sub-models and the effect of model parameters [J]. Cem Concr Res, 1982, 12(6): 765-772. [2] NAVI P, PIGNAT C. Simulation of cement hydration and the connec- tivity of the capillary pore space [J]. Adv Cem Based Mater, 1996, 4(2): 58-67. [3] SUN Z, YE G, SHAH S P, et al. Microstructure and early-age properties of Portland cement paste-effect of connectivity of solids phases [J]. ACI Mater J, 2005, 102(2): 122-129. [4] JUENGER M C G, MONTEIRO P J M, GARTNER E M, et al. A soft X-ray microscope investigation into the effects of calcium chloride on tricalcium silicate hydration [J]. Cem Concr Res, 2005, 35(1): 19-25. [5] RATTANASAK U, KENDALL K. Pore structure of cement/pozzolan composites by X-ray microtomography [J]. Cem Concr Res, 2005, 35(4): 637-640. [6] THOMAS J J, JENNINGS H M, ALLEN A J, et al. Determination of neutron scattering contrast of hydrated Portland cement paste using H2O/D2O exchange [J]. Adv Cem Based Mater, 1997, 7(3): 119-122. [7] SCRIVENER K L. Backscattered electron imaging of cementitious microstructures: understanding and quantification [J]. Cem Concr Comp, 2004, 26(8): 935-945. [8] PAUL S. Scanning electron microscopy imaging of hydraulic cement microstructure [J]. Cem Concr Comp, 2004, 26(8): 957-966. [9] IGARASHI S, KAWAMURA M, WATANABE A, et al. Analysis of cement pastes and mortars by a combination of backscatter-based SEM image analysis and calculations based on the Powers model [J]. Cem Concr Comp, 2004, 26(8): 977-985. [10] DIAMOND S. The microstructure of cement paste and concrete-a visual primer [J]. Cem Concr Comp, 2004, 26(8): 919-933. [11] KATZ A, BENTUR A, KOVLER K, et al. A novel system for in-situ observations of early hydration reactions in wet conditions in conven- tional SEM [J]. Cem Concr Res, 2007, 37(1): 32-37. [12] GALLUCCI E, SCRIVENER K. In-situ SEM study of cement hydration using environmental capsules [J]. Adv Appl Ceram, 2007, 106(6): 319-326. [13] http://www.quantomix.com/tec_lit/QX202cUserManual.pdf of June 2009. QX-Capsule brochures. [14] http://rsb.info.nih.gov/ij/docs/menus/analyze.html of June 2009. Image J software documentation.

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