Paper Titles
Chemical Durability Investigation of Magnesium Phosphosilicate Cement
p.275
The Effects of Cement Content, Sand Percentage and Fly Ash Dosage on Lightweight Aggregate Concrete
p.282
Development and Subjects of Recycled Aggregate Concrete in Japan
p.288
Recycling of Crushed Bricks from Demolished Buildings as Cement-Based Porous Materials
p.301
Quality Improvement of Recycled Aggregate Concrete
p.308
Study on the Workability and Mechanical Properties of Recycled Aggregate Concrete Containing Ultra-Fine Fly Ash
p.314
Study on Pervious Road Brick Prepared by Recycled Aggregate Concrete
p.321
Application of Molten Slag Fine Aggregate Concrete Using Superplasticizer
p.329
Effect of Soaking Time and Polymerization Temperature on Polymer Concrete
p.339

Quality Improvement of Recycled Aggregate Concrete

Article Preview

Abstract:

The developments of recycled aggregate concrete pressing hard in construction activities; however, the limitations on their applications had never being ended. The focus of this paper is: i) investigating the waste management strategy in construction; ii) proposing the two-stage mixing approach (TSMA) to improve the quality of RAC; and iii) experimenting the TSMA and assessing the benefits possibly gained. It proposes a new approach in mixing concrete, namely, the two-stage mixing method, to improve compressive strength of RAC and lower its strength variability. The replacement ratio from zero to thirty is under experiment on their compressive strength. Based upon the experimental results, improvements of 31 % in strength at 28 days with 30 % RA substitute was achieved. The effect can be attributably to the porous nature of the RA and the pre-mix process which can make some pores filled up resulting in a denser concrete and thus leading to higher strength when compared with the traditional mixing approach. Therefore, two-stage mixing approach can open up a wider application of recycled aggregate concrete.

You might also be interested in these eBooks
Environmental Ecology and Technology of Concrete View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 302-303)

Pages:

308-313

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.302-303.308

Citation:

Cite this paper

Online since:

January 2006

Authors:

Vivian W.Y. Tam, X.F. Gao, C.M. Tam

Keywords:

Compressive Strength, Construction, Quality, Recycled Aggregate (RA), Waste Management

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] Urban Renewal Authority. Homepage. available at http: /www. ura. org. hk (2004).

Google Scholar

[2] C.F. Hendriks and H.S. Pietersen: Sustainable raw materials: construction and demolition waste, Cachan Cedex. France: RILEM Publication (2000).

Google Scholar

[3] R.J. Collins: Reuse of demolition materials in relation to specifications in the UK, Demolition and reuse of concrete and masonry: guidelines for demolition and reuse of concrete and masonry: proceedings of the Third International RILEM Symposium on Demolition and Reuse of Concrete Masonry held in Odense, Denmark. 24-27 October 1993, London: E & FN Spon, 1993, pp.49-56.

DOI: 10.1201/9781482271270-18

Google Scholar

[4] M. Torring: Management of concrete demolition waste, Concrete technology for a sustainable development in the 21st century, London: New York: E & FN Spon, 2000, pp.321-331.

DOI: 10.1201/9781482272215-33

Google Scholar

[5] B. Edwards: Sustainable architecture: European directives and building design, 2nd ed. Oxford: Architectural Press, (1999).

Google Scholar

[6] CIRIA (Construction Industry Research and Information Association): Environmental issues in construction: a review of issues and initiatives relevant to the building, construction and related industries, London: CIRIA, (1993).

Google Scholar

[7] J. McLaughlin: A review of the prospects for the greater use of recycled and secondary aggregates in construction, Concrete 27, 1993, pp.16-18.

Google Scholar

[8] T. McLaughlin and M. Tamura: Concrete design towards complete recycling, Structural Concrete 2(3), 2001, pp.155-167.

DOI: 10.1680/stco.2001.2.3.155

Google Scholar

[9] F. Tomosawa and T. Noguchi: New technology for the recycling of concrete - Japanese experience, Concrete technology for a sustainable development in the 21st century, London: New York: E & FN Spon, 2000, pp.274-287.

DOI: 10.1201/9781482272215-28

Google Scholar

[10] J.S. Ryu: An experimental study on the effect of recycled aggregate on concrete properties, Magazine of Concrete Research 54(1), 2002, pp.7-12.

DOI: 10.1680/macr.2002.54.1.7

Google Scholar

[11] BS 812: Part 109: Methods for determination of moisture content, British Standards Institution, London, United Kingdom, (1990).

Google Scholar

[12] BD (BuildingsDepartment): Homepage, available at http: /www. info. gov. hk/bd/english/index. html, (2004).

Google Scholar

[13] BS 812: Part 116: Methods for determination of compressive strength of concrete cubes, British Standards Institution. London. United Kingdom, (1983).

Google Scholar

[14] P.K. Mehta and P.C. Aitcin: Microstructural basis of selection of materials and mix proportions for high strength concrete, High Strength Concrete, Second International Symposium. ACI SP-121, 1990, pp.265-279.

DOI: 10.14359/2500

Google Scholar

[15] S. Mindess, J.F. Young and D. Darwin: Concrete, Upper Saddle River, NJ: Prentice Hall, (2003).

Google Scholar

[16] M.G. Alexander: The effects of ageing on the interfacial zone in concrete, Interfacial transition zone in concrete: state-of-the-art report, 1996, pp.150-174.

DOI: 10.1201/9781482271560-19

Google Scholar

[17] W. Jia, L. Baoyuan, X. Songshan and W. Zhongwei: Improvement of paste-aggregate interface by adding silica fume, Proceedings of the 8th International Congress on the Chemistry of Cement. Vol. III, 1986, pp.460-465.

Google Scholar

[18] W. Keru, and Z. Jianhua: The influence of the matrix-aggregate bond on the strength and brittleness of concrete, Bonding in Cementitious Composites, Materials Research Society Vol. 114. 1988, pp.29-34.

DOI: 10.1557/proc-114-29

Google Scholar

[19] G. Li, H. Xie and G. Xiong: Transition zone studies of new-to-old concrete with different binders, Cement and Concrete Composites 23(4-5), 2001, pp.381-387.

DOI: 10.1016/s0958-9465(01)00002-6

Google Scholar

[20] S. Popovics: Attempts to improve the bond between cement paste and aggregate, Materials and Structures 20(115), 1987, pp.32-38.

DOI: 10.1007/bf02472724

Google Scholar

[21] W. Xueqan, L. Dongxu, B. Qinghan, G. Liqun and T. Minshu: Preliminary study of a composite process in concrete manufacture, Cement and Concrete Research 17(5), 1987, pp.709-714.

DOI: 10.1016/0008-8846(87)90033-0

Google Scholar