Study of Surface Modification of Recycled Aggregate and Mechanical Properties of the Resulting Concrete

Abstract:

In this paper, a method of aggregate surface modification using cement paste with RLP (Redispersable Latex Powder) was proposed aiming to improve properties of recycled aggregates and the resulting concrete. In this study, the cement pastes with different dosages of RLP on RA surface modification were used and the effects on the mechanical properties of the resulting concretes were studied. The experiments were carried in accordance with specifications and test methods in Building pebble and gravel (GB/T 14685-2001) and Ordinary concrete mechanics performance test method standard (GB/T 50081-2002). The test results showed that the properties of recycled aggregates were not as good as those of natural aggregates, thus resulting in poorer mechanical properties of the recycled aggregate concrete. By means of aggregate surface modification, the values of water absorption of the recycled aggregate were reduced and consequently the mechanical properties (i.e. compressive strength and elastic modulus) of the resulting recycled concrete were increased. This research provides some useful practical insights to improving mechanical properties of recycled aggregate concrete.

• Periodical: Advanced Materials Research (Volumes 712-715)
• Pages: 961-965
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.712-715.961
• Online since: June 2013
• Authors: Shu Qing Yang*, Ting Peng, Wai Ching Tang, Hong Zhi Cui
• Keywords: Mechanical Property, Recycled Aggregate (RA), Redispersable Latex Powder, Surface Modification

References

[1] Segre, N. and Joekes I. (2000), Use of tire rubber particles as addition to cement paste, Cement and Concrete Research, 30(9): 1421-1425.

DOI: 10.1016/s0008-8846(00)00373-2

[2] Mukhopadhyay, S.M., Pulikollua R. V., Roy A. K. (2004), Surface modification of a microcellular porous solid: carbon foam, Applied Surface Science, 225(1-4), 223-228.

DOI: 10.1016/j.apsusc.2003.10.015

[3] S. Manzi, C. Mazzotti, M.C. Bignozzi (2013), Short and long-term behavior of structural concrete with recycled concrete aggregate, Cement and Concrete Composites, 37, 312-318.

DOI: 10.1016/j.cemconcomp.2013.01.003

[4] L. Evangelista, J. de Brito (2007), Mechanical behaviour of concrete made with fine recycled concrete aggregates, Cement and Concrete Composites, 29(5), 397-401.

DOI: 10.1016/j.cemconcomp.2006.12.004