NDLI: Preparation of eco-environmental protection bricks from lake sludge

Content Provider	Springer Nature Link
Author	Wu, Jianfeng Li, Fangwen Xu, Xiaohong Su, Xianli
Copyright Year	2008
Abstract	Eco-environmental protection hollow bricks manufactured from lake sludge collected from North Lake in Wuhan of China were investigated. At first, the recipes of round samples( diameter in 5 cm and thickness in 1 cm) prepared by pressing molding under a pressure of 8 MPa and firing system were optimized, and properties such as bending strength, compressive strength, total shrinkage rate, water adsorption rate, apparent porosity and bulk density of the fired samples were tested. The experimental results showed that water adsorption rate and apparent porosity decreased, while bulk density increased with firing temperature increasing. Addition of additive can result in the improvement of strength of fired samples. At the same time, fly ash and additive may also broaden the firing temperature range and reduce firing temperature. Toxic characteristic leaching procedure (TLCP) tests of samples also show that the metal leaching level is low. The conditions for manufacturing good quality sample include 80% sludge with 10% additive and 10% fly ash fired at 1000 °C for 60 min. Bending strength and compressive strength of samples prepared under the conditions are 24.64 MPa, 131.95 MPa, respectively,which are far beyond the requirements of clay solid bricks of CNS. Finally, according to the optimized recipe,the eco-environmental protection hollow bricks with the sizes of 40 mm×38 mm×25 mm were made and tested by extrusion molding. Compared with the Chinese National Standards (CNS: GB13545-2003), compressive strength, water adsorption and bulk denstiy of the hollow bricks are 11.55 MPa,14.5% and 986 kg/m$^{3}$ when they were fired at 1040 °C, which are far beyond the require of of CNS. Especially, its water adsorption arrives to standard of high-class products(16.0%) and compressive strength is above the hightest class(MU10.0).
Starting Page	912
Ending Page	916
Page Count	5
File Format	PDF
ISSN	10002413
Journal	Journal of Wuhan University of Technology-Mater. Sci. Ed.
Volume Number	23
Issue Number	6
e-ISSN	19930437
Language	English
Publisher	Wuhan University of Technology
Publisher Date	2008-12-16
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	lake sludge eco-environmental protection bricks strength performance microstructure Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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