Published on Mar 1, 1984in Cement and Concrete Research10.933
· DOI :10.1016/0008-8846(84)90111-X
J.L. Granju4
Estimated H-index: 4
(INSA: Institut national des sciences appliquées),
J.C. Maso6
Estimated H-index: 6
(INSA: Institut national des sciences appliquées)
Abstract This paper is the first of a series of three. For Portland cement pastes, it presents a model of the micro-structure and the associated compressive strength law which will be the base of the two following papers. Model and strength law involve that the most important parameter influencing the strength is the capillary porosity. They allow to foresee the characteristic properties of the pastes of the first and of the second group. At last they give informations about the structure of the gel.
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1 Author (Åke Grudemo)
#1J.-L. Granju (Institut national des sciences appliquées de Toulouse)H-Index: 2
#2J.C. Maso (Institut national des sciences appliquées de Toulouse)H-Index: 1
Abstract As, considering compressive strength, cement pastes separate into two groups of different behaviour, nothing alike is noticeable when considering their elastic modulus. We explain that by the fact that, although having similar compressive strength, the two main components of pastes, gel and anhydrous portion, have much different elastic moduli; anhydrous part is at least three times stiffer than gel. A formula linking the modulus of the paste to the moduli and proportions of its compone...
#1B.J. Dalgleish (College of Science and Technology)H-Index: 1
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Abstract The requirement for structural resolution in TEM is the preparation of electron-transparent sections, so that for hardened cement paste ion-beam milling is the most practicable technique. Polished thin sections of bulk cement paste and hydrated tricalcium silicate, C 3 S, have been prepared and used for transmitted light microscopy, and to produce ion-beam machined thin-foils for examination in an analytical scanning transmission electron microscope. Scanning electron microscopy, used i...
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#2J.C. Maso (INSA: Institut national des sciences appliquées)H-Index: 6
Abstract In previous studies, we founded that the strength of a whole group of water cured cement pastes is governed by the exponential law σ c = He J Γ, where Γ represents the initial cement content and H and J are functions of cement quality and curing time. In this paper, we study in more detail this exponential law. We separate all parameters interacting in H and J, specify how to calculate their value and deal about their physical signification. The values of these parameters give informati...
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#2A.J. Majumdar (Building Research Establishment)H-Index: 8
Abstract The morphology of a one month old hydrated C 3 S paste has been studied using the scanning electron microscope (SEM) and preferential etching techniques. The C/S ratios of the calcium silicate hydrates (CSH) have been determined using the SEM with an energy dispersive spectrometer. The hydrate rims covering the partially hydrated C 3 S grains were found to consist of two layers; an outer porous product with an acicular morphology having a C/S ratio of 1.6 ± 0.1 and an inner product with...
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Ce travail est consacre a l'etude de l'influence de la composition et du temps de durcissement des pâtes pures de ciment Portland sur, principalement, leur resistance a la rupture en compression et leur coefficient de Poisson. Les pâtes durcies doivent etre caracterisees par leur composition effective a la fin de la ressuee et il apparait que leur porosite capillaire a une influence preponderante sur l'evolution et la valeur des grandeurs mecaniques etudiees. Nous avons degage quelques regles re...
#1Eugene Ryshkewitch (FFO: Wright-Patterson Air Force Base)H-Index: 2
The influence of controlled porosity on the compression strength of sintered pure alumina and of partly magnesia-stabilized zirconia was investigated. Bodies with porosities ranging from approximately 3 to 60% by volume were prepared utilizing hydrogen peroxide to induce pore formation. Cubes of approximately 1.2-cm, unit length were used in testing for compression strength at room temperature. The spatial arrangement of pores in sintered alumina was found to exert an influence, inasmuch as bodi...
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The concept of the water–cement and water–binder ratios is the base of concrete technology. This chapter explains the physical meaning of the water–cement (w/c) and water–binder (w/b) ratios, the nature of Portland cement, and how it hydrates. The numerical values of the w/c and w/b ratios are directly related to the distance separating the cementitious particles in a cement paste when the hydration process starts. These ratios directly impact the ultimate porosity, density, and mechanical prope...
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#2W. Wilson (Université de Sherbrooke)
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In view of the increasing worldwide demand for concrete, it is necessary to propose methods of testing associated with the building and follow-up of civil engineering structures. Concrete is a complex, multiple-phase material that is subject to atmospheric stresses. Its composition and implementation are very important for its life duration. The purpose is to propose different methods of non-destructive testing of cement matrix materials, based on heat transfer. The values obtained are linked to...
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#2Surendra P. Shah (NU: Northwestern University)H-Index: 116
Self-consolidating concrete, (SCC) is a new technology and the market share of its products is rapidly growing because of the economic opportunities and improvements of the quality of the concrete and the working environment. In view of the potential number of ingredients, SCC is a complex system that is usually proportioned with one or more mineral admixtures and one or more chemical admixtures. A key factor for a successful formulation is a clear understanding of the role of the various consti...
#1D. BonenH-Index: 1
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