The Research on Early Age Deformation of Shrinkage-Compensating Concrete

Abstract:

Measuring techniques for vertical deformation and horizontal deformation of concrete were introduced in the paper. Based on these techniques, concrete deformation about reference concrete and shrinkage-compensating concrete were studied. The results show that workability of concrete was almost not affected by expansive agent. Usually deformation testing began when the mold has been removed 24 hours after casting according to present standard, but the reaserch shows that the time of starting measurement has a little influence on deformation of reference concrete, while its vastly affected on those of shrinkage-compensating concrete with expansive agent. Thus, its essential to judge time-zero accurately for shrinkage-compensating concrete. Before final set, concrete is on the plastic stage when the concrete has no enough stiffness to store expansive energy, so the measurement results should be zeroed to the time of final set especially for concrete with expansive to evaluate expansive validity better.

• Periodical: Advanced Materials Research (Volumes 785-786)
• Pages: 287-290
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.785-786.287
• Online since: September 2013
• Authors: Shou Zhi Zhang*, Ting Yao, Qian Tian, Fei Guo
• Keywords: Concrete, Deformation, Early Age, Expansive Agent, Shrinkage-Compensating

References

[1] Sant, G., Lura, P. and Weiss, W.J., Measurement of Volume Change in Cementitious Materials at Early Ages: Review of Testing Protocols and Interpretation of Results, Transportation Research Record 1979 (2006) 21-29.

DOI: 10.1177/0361198106197900104

[2] Tian Q and Jensen, O. M., Measuring Autogenous Strain of Concrete, technical report, Technical University of Denmark, Department of Civil Engineering, 2007, Lyngby , Denmark.

[3] R. Troli, M. Collepardi. Shrinkage-Compensating Concretes for Special Structures Proceedings of 4th International Conference on "Non-Traditional Cement & Concrete, Brno (Czech Republic), June (2011). 27-30.

[4] N.S. Berke et al. Improving concrete performance whith Shrikage-Reducing Admixtures, 7th CANMET/ACI International Conference on Superplasticizer and Other Chemical Admixtures in Concrete, Berlin, Germany, Ed. V.M. Malhotra, 2003, 37-50.

DOI: 10.14359/12904

[5] M. Collepardi, A. Borsoi, S. Collepardi, J.J. Ogoumah Olagot, R. Troli, Effects of Shrinkage-Reducing Admixture in Shrinkage Compensating Concrete Under Non-Wet Curing Conditions, Cement and Concrete Composities, 6(2005), 704-708.

DOI: 10.1016/j.cemconcomp.2004.09.020

[6] F. Tittarelli, S. Monosi, G. Moriconi, R. Troli Effects of a shrinkage compensating Admixture inShrinkage-Compensating Concretes", to be presented in "9th ACI International Conference on Superplasticizer and Other Chemical Admixtures, Seville, (2009).

DOI: 10.14359/51663248

[7] Jensen, O.M. and Hansen, P.F., A dilatometer for measuring autogenous deformation in hardening Portland cement paste, Mater. Struct. 28 (181) (1995) 406-409.

DOI: 10.1007/bf02473076

[8] Q. Tian, W. Sun, C. W. Miao and J. P. Liu: J. Building Materials. 8(2005) 82–89.