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Evaluation on later-age performance of concrete subjected to early-age freeze–thaw damage
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand. School of Civil Engineering, Southeast University, 211189 Nanjing, PR China; National Engineering Research Center for Prestressing Technology, Southeast University, 211189 Nanjing, PR China.ORCID-id: 0000-0002-8372-1967
School of Civil Engineering, Southeast University, 211189 Nanjing, PR China.
School of Civil Engineering, Southeast University, 211189 Nanjing, PR China.
School of Civil Engineering, Southeast University, 211189 Nanjing, PR China.
2021 (Engelska)Ingår i: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 270, artikel-id 121491Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This research studies the influences of pre-curing time, the number and environment of early-age freeze–thaw damage (E-FTD) and later-age curing methods on later-age performance of concrete subjected to E-FTD. The concrete specimens with pre-curing time of 18 h, 24 h, 48 h and 72 h were subjected to four different E-FTD systems. Subsequently, three later-age curing methods were performed to the time of 28 days respectively and finally the later-age compressive strength, resistance to chloride penetration and freeze–thaw of concrete were evaluated. The results show that all three later-age performance indexes improve gradually as the pre-curing time prolongs. The damage of the salt freeze–thaw environment to early-age concrete is severer than that of the water freeze–thaw environment, resulting in the unsatisfactory later-age performance even with restorative curing. Among all later-age curing methods, the restoration effect of water curing on later-age performance is the best. Compared to the standard curing, the restoration effect of natural air curing on later-age compressive strength and resistance to chloride penetration of concrete is better, but that on resistance to freeze–thaw is worse. For the concrete with shorter pre-curing time, the recovery percentage of durability indexes, especially the resistance to freeze–thaw, is always lower than that of compressive strength. The pre-curing time should be prolonged appropriately for the early-age freeze–thaw damaged concrete with the requirement of durability.

Ort, förlag, år, upplaga, sidor
Elsevier, 2021. Vol. 270, artikel-id 121491
Nyckelord [en]
Early-age freeze–thaw damage, Pre-curing time, Later-age curing, Durability
Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Byggkonstruktion
Identifikatorer
URN: urn:nbn:se:ltu:diva-81439DOI: 10.1016/j.conbuildmat.2020.121491ISI: 000608034600103Scopus ID: 2-s2.0-85096006856OAI: oai:DiVA.org:ltu-81439DiVA, id: diva2:1501947
Anmärkning

Validerad;2021;Nivå 2;2021-01-26 (alebob);

Finansiär: National Natural Science Foundation of China (51378104)

Tillgänglig från: 2020-11-18 Skapad: 2020-11-18 Senast uppdaterad: 2025-10-22Bibliografiskt granskad

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Tu, Yongming

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