Research on the Application of Expansive Agent in C60 Self-Compacting Concrete

Abstract:

It analyzed the performance, mechanical properties, volume stability, microstructure of hydration cementitious material of C60 self-compacting expansion concrete, which dependent on CSA to expansive ettringite source for the expansion. Results suggest that on the same curing conditions, C60 self-compacting concrete with the water-cement ratio of 0.32 admixture CSA expansive agent can effectively control the shrinkage of concrete, so that it is slightly inflated. The dosage of CSA expansive is higher, early strength of C60 self-compacting concrete is lower and its late strength declines small. It is affected little for the slump and extended degree of concrete under the superplasticizer by the expansive agent. SEM results show that CSA expansion agent can improve the pore structure of hydrated cement paste system with low water-binder ratio. The gel phase after hardening has good compactness and ettringite needlelike crystals mostly distribute at each interface layer.

• Periodical: Key Engineering Materials (Volumes 629-630)
• Pages: 425-431
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.629-630.425
• Online since: October 2014
• Authors: Xi Qiang Lin*, Guo You Li, Liang Huo
• Keywords: CSA Expansive Agent, Mechanical Property, Microstructure, Self-Compacting Concrete

References

[1] Hajime Okamura. Self-Compacting High-Performance Concrete[J]. Concrete International, 1997, (7).

[2] Wu Zhongwei, Lian Huizhen. High performance concrete [M]. China railway publishing house, Beijing (1999).

[3] A.M. Neville, W.H. Dilger and J.J. Brooks : Creep of Plain and Structural Concrete, Construction Press, London and New York, 1983, 158-181.

[4] Effects of Shrinkage Reducing Admixture in Shrinkage Compensating Concrete. M. Collepardi, A. Borsoi, S. Collepardi, J.J. Ogoumah Olagot, R. Troli ENCO, Engineering concrete, Ponzano Veneto, (TV), Italy.

DOI: 10.1016/j.cemconcomp.2004.09.020

[5] Jianshen Yang. Deformation characteristics and their being controlled of high performance concrete[J]. Concrete, 2001 (10) 13 -16.

[6] Zhu Chuangdun, Chen Min. Early shrinkage and creep properties of high strength concrete[J]. China concrete and cement products. 2005 (2) 1-4.

[7] Xiqiang Lin, Dongmin Wang. Raw material ratio and the fineness of grinding of two component system expansive agent influent the performance of the expansion[J] Concrete, 2012(1)62-67.

[8] Taylar H. F. W. Cement Chemistry. St Edmunds bury Press Ltd, 1990: 325-337.

[9] Y. Yamazaki, H. Kamiaka, S. Kobayashi & T. Hirose, Expansion mechanism and hydration of expansive cement. CAJ Review of the 34th General Meeting, 34 (1980) 59-61.

[10] D. Heinz, U. Ludwig. Mechanism of subsequent ettringite formation in mortars and concretes after heat treatment, Proceedings of the 8th International Congress on the Chemistry of Cement. Rio De Janeiro, May 1986 pp.189-194.

[11] C.D. Lawrence. Mortar expansions due to delayed ettringite formation-Effect of curing period and temperature. Cement and Concrete Research, 1995, 25(4) pp.903-914.

DOI: 10.1016/0008-8846(95)00081-m

[12] S. Diamond Delayed ettringite formation-process and problems. Cement and Concrete Composites, 1996, 18 pp.205-215.

DOI: 10.1016/0958-9465(96)00017-0