Microstrain distribution in calcium hydroxide present in the interfacial transition zone

Microstrain distribution in calcium hydroxide present in the interfacial transition zone

This article develops an approach for estimating the microstrain distribution along the thickness of the interfacial transition zone (ITZ) formed between aggregate and cement paste. This approach is dependent on the effectiveness of the X-ray's penetration depth into the sample and on the order...

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Bibliographic Details
Published in:Cement and concrete research Vol. 30; no. 5; pp. 709 - 713
Main Authors: Harutyunyan, V.S, Abovyan, E.S, Monteiro, P.J.M, Mkrtchyan, V.P, Balyan, M.K
Format: Journal Article
Language:English
Published: New York, NY Elsevier Ltd 01-05-2000
Elsevier Science
Subjects:
Applied sciences
Buildings. Public works
Ca(OH) 2
Cement concrete constituents
Cements
Elastic moduli
Exact sciences and technology
Hydration
Materials
Modeling
Properties of anhydrous and hydrated cement, test methods
X-ray diffraction
X-ray diffraction
Elastic moduli
Modeling
Ca(OH) 2
Microdeformation
Elastic modulus
Hydration
Theory
Cement paste
Absorptance
Calcium hydroxide
X ray diffraction
Texture
Wave reflection
Interfacial area
Penetration depth
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Summary:This article develops an approach for estimating the microstrain distribution along the thickness of the interfacial transition zone (ITZ) formed between aggregate and cement paste. This approach is dependent on the effectiveness of the X-ray's penetration depth into the sample and on the order of active reflection from calcium hydroxide (CH) texture. The ITZ was simulated by first casting cement paste on top of a polished flat substrate of granite. Next, the composite specimen was cured under saturated conditions and then broken at the substrate–cement paste interface for X-ray diffraction examination. Four orders (001, 002, 003, and 004) of reflection CoK α from the CH texture were recorded. The experimental results indicate that the sizes and the microstrain of the CH crystallites decrease with increasing distance from the aggregate–cement paste interface.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(00)00230-1