Study on Mechanical Properties of Microbead Modified Super Sulfate Cement Concrete

Abstract:

The microbead modified super sulfate cement (SSC) was employed to prepare C60~C80 concrete, this work emphasis on mechanical properties and micro-mechanism, besides, the service behaviors of fresh concrete was tested. The SSC concrete mechanical properties influenced by particles size of microbead, slag and gypsum were discussed. Mechanisms of mechanical properties changes were elaborated from micro, meso and macro scales, mechanical model was established and relevant rules of mechanical properties development were obtained. Experiment results show that compressive strength increased with the largerer specific surface area of microbead, slag powder and gypsum. There was a promoting effect for SSC concrete hydration reaction by appropriate dosage (10%~20%) of microbead, which had prominent interstitial effect and system with excellent gradation, and fresh concrete workability was significantly improved. The compressive strength—curing ages model of high strength SSC concrete was established by half value intensity index, which coincide well with measured values. Key words: super sulphated cement concrete, microbead, mechanical properties, mechanical model, specific surface area

• Periodical: Key Engineering Materials (Volumes 629-630)
• Pages: 455-461
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.629-630.455
• Online since: October 2014
• Authors: Yu Xin Gao, Jia Yu Xiang*, Jun Wang, Bao Ying Yu
• Keywords: Mechanical Model, Mechanical Property, Microbead, Specific Surface Area, Super Sulphated Cement Concrete

References

[1] Y. X. Gao, B. Y. Yu, F. L. Xu. Effect of Modified Phosphogypsum on the Mechanical Properties of Super Sulphate Cement [J]. Applied Mechanics and Materials, 2012, 161: 264~268.

DOI: 10.4028/www.scientific.net/amm.161.264

[2] M. Singh. Treating waste phosphogypsum for cement and plaster manufacture[J], Cement and Concrete Research, 2002, (32): 1033~1038.

DOI: 10.1016/s0008-8846(02)00723-8

[3] W. Wei, A. Z. Zhao, F. Li. Nanukuttan. Mathematical Model for Age—Dependent Compressive Strength of Recycled Coarse Aggregate Concrete[J]. Construction and Building Materials, 2012, 15(5): 633~637.

[4] A. Elahi, P.A.M. Basheer, S.V. Nanukuttan. Mechanical and durability properties of high performance concretes containing supplementary cementitious materials [J]. Construction and Building Materials, 2010, 24: 292-299.

DOI: 10.1016/j.conbuildmat.2009.08.045

[5] Y. X. Gao, B. Y. Yu, F. L. Xu. Preparation of Calcined Phosphogypsum-based High-strength Supersulphated Cement [J]. Applied Mechanics and Materials, 2012, 188: 199~204.

DOI: 10.4028/www.scientific.net/amm.188.199

[6] J. Zhou, S.Z. Qian, M. G. Sierra Beltran. Development of engineered cementitious composites with limestone powder and blast furnace slag[J], Materials and Structures, 2010, 43(6): 803~814.

DOI: 10.1617/s11527-009-9549-0