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Evaluation of internal damage law of concrete under coupling action of sulfate and dry-wet cycles by the relative method

Li, W; Bao, Y; Wang, Y; Bai, Y; (2018) Evaluation of internal damage law of concrete under coupling action of sulfate and dry-wet cycles by the relative method. Liaoning Gongcheng Jishu Daxue Xuebao (Ziran Kexue Ban)/Journal of Liaoning Technical University (Natural Science Edition) , 37 (2) pp. 332-340. 10.11956/j.issn.1008-0562.2018.02.018. (In press).

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Abstract

Relative method is a simple way to determine the internal elastic modulus and strength of composite material layer by layer. This method is applied in the field of concrete materials in this paper, on the basis of measuring the dynamic elastic modulus of each sample before and after milled from the outside to the inside. Dynamic elastic modulus of different gradient damaged layer inside concrete samples are calculated by using the theoretical equation of relative method. Furthermore, the internal damage laws of concrete under coupling action of sulfate and dry-wet cycles are studied. The results show that the internal dynamic elastic modulus of concrete outside to the inside layer decreases with the increase of erosion depth, and the concrete will take place the inside-out destruction step by step; with the extension of the cycle of wet and dry, the dynamic elastic modulus variation curves of each damaged layer inside the concrete specimens are starting with a higher starting point at first, then decreased to some extent due to experience the sulfate attack, and began to pick up after experienced a certain number of dry-wet cycles. The depth of erosion layer can be obtained corresponding the lowest value of wet and dry cycle numbers; the dynamic modulus of internal concrete with mineral admixtures is less than that of benchmark concrete, which indicates that the incorporation of mineral admixtures add the damage rate of concrete under the action coupling of dry-wet cycles and sulfate erosion. In this study, the relative method is used to measure the internal dynamic elastic modulus and strength of concrete, which provides a new way to evaluate the internal mechanical properties and durability of concrete under coupling action of sulfate and dry-wet cycles.

Type: Article
Title: Evaluation of internal damage law of concrete under coupling action of sulfate and dry-wet cycles by the relative method
DOI: 10.11956/j.issn.1008-0562.2018.02.018
Publisher version: https://doi.org/10.11956/j.issn.1008-0562.2018.02....
Language: Chinese
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10087149
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