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Evaluation of freeze-thaw damage on concrete material and prestressed concrete specimens
School of Civil Engineering, Southeast University.
School of Civil Engineering, Southeast University.
School of Civil Science and Engineering, Yangzhou University.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
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Number of Authors: 10
2016 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 125, 892-904 p.Article in journal (Refereed) Published
Abstract [en]

The pore structure of the hardened concrete and the microscopic changes of a few selected pores throughout the freeze-thaw test were investigated by a method combining RapidAir and digital metalloscope. Traditional tests were also performed to evaluate the macroscopic change caused by freeze-thaw cycles (FTCs). The investigation shows that the concrete material, of which the spacing factor is 0.405 mm and the air content is 2.38%, can still withstand more than 300 FTCs. Severe microscopic damages occurred after approximately 200 FTCs and the freeze-thaw damage were gradually aggravated afterwards. Prestress forces have a remarkable impact on the failure pattern under FTCs. It was further found that the compressive strength as an indicator is more reliable than the relative dynamic modulus of elasticity in evaluating the freeze-thaw damage on concrete material. In addition, the test and analysis show that the measured prestress losses of bonded specimen are larger than that of unbounded specimen under the attack of FTCs due to the duct grouting effect. The ultimate freeze-thaw prestress loss is about 5% of σconσcon for both the bonded and unbonded specimens because the grouting cement paste will eventually be completely destroyed.

Place, publisher, year, edition, pages
2016. Vol. 125, 892-904 p.
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-59653DOI: 10.1016/j.conbuildmat.2016.08.098ISI: 000385600100088ScopusID: 2-s2.0-84984828018OAI: oai:DiVA.org:ltu-59653DiVA: diva2:1034100
Note

Validerad; 2016; Nivå 2; 2016-10-10 (andbra)

Available from: 2016-10-11 Created: 2016-10-11 Last updated: 2016-11-11Bibliographically approved

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