The Microstructure and Composition of Hardened Cement Pastes
Author: I. G. Richardson
Publisher:
Published: 1991
Total Pages: 628
ISBN-13:
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Author: I. G. Richardson
Publisher:
Published: 1991
Total Pages: 628
ISBN-13:
DOWNLOAD EBOOKAuthor: C. D. Lawrence
Publisher:
Published: 1982
Total Pages: 26
ISBN-13: 9780721012629
DOWNLOAD EBOOKAuthor: Wieslaw Kurdowski
Publisher: Springer Science & Business
Published: 2014-04-24
Total Pages: 705
ISBN-13: 9400779453
DOWNLOAD EBOOKThis monograph describes cement clinker formation. It covers multicomponent systems, clinker phase structures and their reactions with water, hydrate composition and structure, as well as their physical properties. The mineral additions to cement are described as are their influence on cement-paste properties. Special cements are also discussed. The microstructure of concrete is then presented, and special emphasis is given to the role of the interfacial transition zone, and the corrosion processes in the light of cement-phase composition, mineral additions and w/c ratio. The admixtures' role in modern concrete technology is described with an emphasis on superplasticizer chemistry and its cement-paste rheological modification mechanism. Cement with atypical properties, such as calcium aluminate, white, low energy and expansive cements are characterized. The last part of the book is devoted to special types of concrete such as self compacting and to reactive powders.
Author: Hubertus Henricus Willems
Publisher:
Published: 1985
Total Pages: 117
ISBN-13:
DOWNLOAD EBOOKAuthor: D. M. Roy
Publisher: Strategic Highway Research Program (Shrp)
Published: 1993
Total Pages: 204
ISBN-13:
DOWNLOAD EBOOKDurability of concrete in highway systems is a problem of national concern. In order to better understand the mechanisms which intrinsically control durability in highway concrete, it is necessary to define and understand those factors which impact concrete microstructure which is a consequence of both its formulation and the processes taking place during mixing, placing and curing. This report documents an investigation of those variables which control cement hydration and consequent microstructural development.
Author: Yuting Wang
Publisher:
Published: 1995
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKThe characterization of the microstructure of a material should include two aspects: the identification of the microstructural elements in the material, and the quantitative characterization of these microstructural elements. In this research. the microstructure of hardened cement paste (hcp) was studied using BEI on polished surfaces coupled with image analysis. The microstructural elements evaluated included (a) pores detectable at the magnifications used, (b) CH crystals, (c) residual unhydrated cement particles, (d) hydrated phenograins, consisting of both hydration shells and fully hydrated cement grains, (e) combined phenograins, i.e. (c) and (d) combined as they occur in individual features, and (f) the C-S-H in the groundmass. The quantitative analyses assayed include both area fraction measurement and geometrical measurement of individual features. The latter provides information on size., shape, size distribution and mutual arrangement of the these individual features. Various hcps were investigated to quantitatively elucidate the effects of w:c ratio, age, and the incorporation of superplasticizer and silica fume on hcp microstructure. It was found that quantitative image analysis of hcp can yield interesting. and sometimes unexpected insights into the microstructure of hcp. The incorporation of superplasticizer and the incorporation of both superplasticizer and silica fume showed very strong effects on the hcp microstructure. On the other hand silica fume alone did not show strong effects. In another portion of this research, the fractal dimension characteristic of the pore system of hcp was investigated using an image analysis technique. It was found that the detectable pore system in cement pastes shows two fractal regimes: a structural fractal dimension exhibited at low resolution (Ds = 1.08 ~ 1.15) and a textural fractal dimension exhibited at higher resolution (Dt = 1.22 ~ 1.49). Finally, using a stereoscopic SEM method, it was found that the fracture surface of cement pastes shows two distinct fractal regimes: a structural fractal regime at low magnifications descriptive of the gross structural irregularities, and a textural fractal at high magnifications descriptive of the textural details of the fracture surface. The structural fractal and the textural fractal seem to have universal values of 2.02 and 2.12 respectively.
Author: Ragai Charles Ramzy Stino
Publisher:
Published: 1972
Total Pages: 390
ISBN-13:
DOWNLOAD EBOOKAuthor: Catherine Anne Love
Publisher:
Published: 2002
Total Pages: 414
ISBN-13:
DOWNLOAD EBOOKAuthor: Robert Brady Williamson
Publisher:
Published: 1971
Total Pages: 15
ISBN-13:
DOWNLOAD EBOOKThe constitution and hydration of portland cement is reviewed and the microstructure of hardened cement paste is introduced with scanning electron micrographs. The development of strength of monoclinic tricalcium silicate (i.e., alite) pastes both with and without the addition of gypsum is presented using scanning micrographs of fresh fracture surfaces. This experimental data is used to illustrate the general principles in the relationship between microstructure and mechanical properties for portland cement pastes. (Author).
Author: Yanrong Zhang
Publisher: Springer
Published: 2017-07-25
Total Pages: 271
ISBN-13: 9811045704
DOWNLOAD EBOOKThis thesis studies the effects of superplasticizers, polyacrylate latexes and asphalt emulsions, which differ in molecular/particle size from nanometers to microns, on the rheological properties of fresh cement pastes (FCPs), as well as the action mechanisms involved. It systematically investigates the rheological properties and microstructure of cement-based materials, and elucidates the adsorption behaviors of polycarboxylate polymers with different functional groups and their effects on cement hydration. Moreover, it reveals how the working mechanism of naphthalene sulfonate formaldehyde (NSF) differs from that of polycarboxylate ether-based (PCE) superplasticizers. Lastly, it develops a conceptual microstructure model and two rheological equations. These findings lend theoretical support to the development of new chemical admixtures and new, higher-performance, cement-based composites.