Study on the Dense-Packing Effect and Properties of Multi-Component Cementitious Material

Abstract:

The paper studied the effects of single addition of ultrafine fly ash (UFA) and mixed addition of silica fumeultrafine fly ash (SF-UFA) on powder pressure entity dense packing density, mechanical performance and microstructure structure of composite cement paste. The results show that, the ternary system of mixed addition of SF-UFA can effectively further reduced the compacting voidage and more increased packing density of composite powder, compared with the binary system of single addition of UFA. And when the content of SF is 8%, the compacting voidage is the lowest. Next, in the ternary system of mixed with silica fume, ultrafine fly ash and cement (SF-UFA-C), with the increase of silica fume (SF), the total porosity and pore diameter of hardened cementing paste decreased further compared with binary system, and with 8% content of SF and 17% content of UFA, the total porosity of hardened cement paste is the lowest, decreased by 60% than that of reference sample. At last, mixed addition of SF-UFA can improve the long-term strength of composite cement paste either, the compressive strength of 60 days hydration increased by nearly 9% compared with UFA-C and increased 41% compared with the reference sample.

• Periodical: Advanced Materials Research (Volume 856)
• Pages: 29-35
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.856.29
• Online since: December 2013
• Authors: Wen Yang*, Nai Qian Feng, Tew Kia Hui, Li Li Jia, Bao Jun Cheng
• Keywords: Dense-Packing Effect, Model Validations, Multi-Component Cementitious Material, Pore Structure

References

[1] N.Q. Feng. Development and application of high performance concrete and ultra-high performance concrete [J]. Construction technology, 2009, 38 (4): 1~6.

[2] L.X. Chen, N.Q. Feng, R.G. Xu: Beads-The new material of low carbon concrete (China Building Industry Press, Nanchang, Jiangxi, (2010).

[3] Q.J. Ding, J.Y. Han: submitted to Journal of Wuhan University of Technology. (2011).

[4] NQ. Feng, YX. Shi, TY. Hao. Influence of ultrafine powder on the fluidity and strength of cement paste[J]. Advance in Cement Research, 2000, 12(3): 89~95.

DOI: 10.1680/adcr.2000.12.3.89

[5] G.X. Chen, G.J. Ji, A.Z. Lei, J.T. Tian. Study on synergistic effect of multi-component cementitious material [J]. Journal of the Chinese ceramic society, 2004, 32(3): 351-357.

[6] Shen Yeqing. Methodology for characterization of cement compacts and evolution of structure & properties of hydrated cement compacts [D]. Nanjing: Nanjing University of Technology.

[7] Wen Yang, B.J. Chen, X.Q. Liu. Research on the effect of beads on properties of cementing materials[J]. Concrete, 2013 (6).

[8] G.L. Fu, S.H. Feng, Hui Li: submitted to Journal of Xi'an University of Arch. &Tech. Vol. 3 (2011) 385-389.

[9] YU A B, STANDISH N. Porosity calculations of multi-component mixtures of spherical particles [J]. Powder Technol, 1987, 52: 233—240.

DOI: 10.1016/0032-5910(87)80110-9

[10] A.Q. Wang, C.Z. Zhang, N.S. Zhang. The theoretic analysis of the influence of the particle size distribution of cement system on the property of cement [J]. Cement and Concrete Research, 1999, 29(11): 1721-1726.

DOI: 10.1016/s0008-8846(99)00148-9