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Advances in Materials Science and Engineering
Volume 2016, Article ID 5820870, 8 pages
http://dx.doi.org/10.1155/2016/5820870
Research Article

Research on Properties of Foamed Concrete Reinforced with Small Sized Glazed Hollow Beads

1College of Architecture & Environment, Sichuan University, Chengdu 610064, China
2Sichuan College of Architectural Technology, Deyang 618000, China
3School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China

Received 21 February 2016; Revised 7 April 2016; Accepted 7 April 2016

Academic Editor: Robert Cerný

Copyright © 2016 Chi Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Foamed concrete (400 kg/m3) was prepared through a physical foaming method using ordinary Portland cement (42.5R), vegetable protein foaming agent, fly ash, and glazed hollow beads (GHB, K46) as raw materials. The performance of cement paste as well as the structure and distribution of air voids was characterized by rheometry, SEM, and XRD analyses with imaging software. The effects of GHBs on the compressive strength and thermal conductivity of the foamed concrete sample were also explored. Results show that the proportion of 50–400 μm air voids, average air-void diameter, 28 d compressive strength, and thermal conductivity of the test sample mixed with 2.4 wt% GHBs are 94.44%, 182.10 μm, 2.39 MPa, and 0.0936 w/(m·k), respectively. Excessive amount of GHBs (>2.4 wt%) increases the amount of air voids with diameter smaller than 50 μm in the hardened foamed concrete as well as the degree of open porosity. Moreover, the proportion of 50–400 μm air voids, average air-void diameter, 28 d compressive strength, and thermal conductivity of the sample mixed with 4.0 wt% GHBs are 88.54%, 140.50 μm, 2.05 MPa, and 0.0907 w/(m·k), respectively.