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Study on the self-desiccation effect in early-age concrete and the determination of “time-zero” of self-desiccation shrinkage



Title: Study on the self-desiccation effect in early-age concrete and the determination of “time-zero” of self-desiccation shrinkage
Author(s): Jia-ping Liu, Qian Tian, Wei Sun, Chang-wen Miao, Ming-shu Tang
Paper category : conference
Book title: International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation
Editor(s): O. M. Jensen, P. Lura, K. Kovler
Print-ISBN: 2-35158-004-4
e-ISBN: 2351580052
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 401 - 410
Total Pages: 10
Nb references: 9
Language: English


Abstract: Self-desiccation shrinkage (SDS) is closely related to the drop of internal relative humidity (IRH) of the concrete. For high performance concrete, once the solid skeleton forms, SDS increases rapidly. However, it is hard to investigate the IRH developing by conventional methods because the IRH is still too high at this very early-age. In this paper, a special system was developed to monitor the meniscus depression and IRH changing automatically immediately after casting until several hours after initial set. By using this system, the effects of water to binder ratio, fly ash, silica fume, and shrinkage reducing agent on self-desiccation were investigated for the very early-age concrete. The test results gave a possible explanation for the mechanism of initial SDS of concrete. Finally, a discussion is made about the reliability of the penetration test for determination of “time zero” both for its physical significance and practical testing combining with the experimental results.


Online publication: 2006-07-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580052.043