مقاله Measurements of strain and humidity within massive concrete cylinders related to the formation of ASR surface cracks : تی پی بین

خلاصه مقاله

This study aims at proving the validity of a notion that the formation of non-expansive near-surface layer is responsible for surface cracking in ASR-affected concretes by a laboratory experiment. Relationship between the progress rate of the front of non-expansive layer toward inner portions and the formation of the first surface cracks was scrutinized by measuring relative humidity (R.H.) values and strains within a massive concrete cylinder (ϕ450 mm × 900 mm) with reactive aggregates under a dry environment. It was presumed from the measurements that a non-expansive layer of about 40 mm had been formed at the first cracking. Thereafter, the environmental humidity was raised to > 95% R.H. Pursuit of the growth of surface cracks and subsequent measurements of strains and R.H. values within the concrete cylinder under the moist environment suggested that the re-saturation continuously gave rise to the generation of tensile stresses in near-surface regions leading to active extension of surface cracks.

نویسندگان

Hiroyuki Kagimoto [ Civil Engineering Laboratory, Electric Power Development Co., Ltd., 9-88, Chigasaki, Kanagawa, Japan ]

Mitsunori Kawamura [ Kanazawa University, Kakuma, Kanazawa, Japan ]

کلمات کلیدی

(ASR expansion (C) Humidity (A) Strain (B) Non expansive layer (C) Surface cracking (B

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Cement and Concrete Research 2011

The aim of Cement and Concrete Research is to publish the best research on cement, cement composites, concrete and other allied materials that incorporate cement. In doing so, the journal will present: the results of research on the properties and performance of cement and concrete; novel experimental techniques; the latest analytical and modelling methods; the examination and the diagnosis of real cement and concrete structures; and the potential for improved materials. The journal's principal publications are original articles containing new information, major reviews and selected papers from important conferences. Discussion of published material and rapid communications will form part of the journal where appropriate. The journal will focus on papers with a broad interest, based upon their subject area, the quality of the research, the novelty of the results and the potential for assimilation of the findings.

حوزه های تحت پوشش : cement, cement composites, concrete and other allied materials that incorporate cement