Health & Environmental Research Online (HERO)


Print Feedback Export to File
7162914 
Journal Article 
Use of limestone powder during incorporation of Pb-containing cathode ray tube waste in self-compacting concrete 
Sua-Iam, G; Makul, N; , 
2013 
Yes 
Journal of Environmental Management
ISSN: 0301-4797
EISSN: 1095-8630 
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD 
LONDON 
128 
931-940 
English 
23892134 
WOS:000326203400100 
For several decades, cathode ray tubes (CRTs) were the primary display component of televisions and computers. The CRT glass envelope contains sufficient levels of lead oxide (MO) to be considered hazardous, and there is a need for effective methods of permanently encapsulating this material during waste disposal. We examined the effect of adding limestone powder (LS) on the fresh and cured properties of self-compacting concrete (SCC) mixtures containing waste CRT glass. The SCC mixtures were prepared using Type 1 Portland cement at a constant cement content of 600 kg/m(3) and a water-to-cement ratio (w/c) of 0.38. CRT glass waste cullet was blended with river sand in proportions of 20 or 40% by weight. To suppress potential viscosity effects limestone powder was added at levels of 5, 10, or 15% by weight. The slump flow time, slump flow diameter, V-funnel flow time, Marsh cone flow time, and setting time of the fresh concrete were tested, as well as the compressive strength and ultrasonic pulse velocity of the hardened concrete. Addition of limestone powder improved the fresh and hardened properties. Pb leaching levels from the cured concrete were within US EPA allowable limits. (C) 2013 Elsevier Ltd. All rights reserved.