Creep and shrinkage of self-compacting concrete: a different behaviour compared with vibrated concrete?

Title: Creep and shrinkage of self-compacting concrete: a different behaviour compared with vibrated concrete?
Author(s): G. Pons, E. Proust, S. Assié
Paper category : conference
Book title: International RILEM Symposium on Self-Compacting Concrete
Editor(s): O. Wallevik and I. Nielsson
Print-ISBN: 2-912143-42-X
e-ISBN: 2912143713
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 645 - 654
Total Pages: 10
Nb references: 5
Language: English

Abstract: This is a research program undertaken at the LMDC with the support of National French Research Plan: Self-Compacting Concrete (S.C.C.). Eight compositions of S.C.C were tested during 3 years in comparison with Vibrated Concrete (V.C.). V.C. was made with an analogous mixture base, that is to say same nature of aggregate, same cement but of course, different mineral admixtures and cohesion agent. The principal common factors were the same 28-day compressive strengths. These were between 40 and 70 MPa.
The tests were carried out in endogenous and in desiccation conditions in a 20°C and 55% HR-room. For creep-tests, loading was applied 7 days after casting and loading level was 40% of 7 days compressive strength. In a first time, experimental instantaneous behaviour (strength, strength evolution versus time, elasticity modulus) and experimental delayed behaviour (endogenous and desiccation shrinkage, basic and desiccation creep) of S.C.C. were compared with these of corresponding V.C. Mains results are: S.C.C elasticity moduli are very close than corresponding V.C. For delayed behaviour, tests carried out shown those S.C.C. behaviours and those of V.C. are similar. Notable differences are exceptional and only appear in very particular compositions. In a second time, experimental results were compared with two Code Model estimates, French Regulation (BPEL 1999) on one hand and the final draft of Eurocode 2 on other hand. In all cases, it appears that Code Model estimations generally are optimist for S.C.C. as well as V.C.. This phenomenon has been ascribed to the mineralogical nature of the used aggregate.

Online publication: 2003-08-21
Publication type : abstract_only
Public price (Euros): 0.00