Assessing the Applicability of Ecological Materials Obtained with CRT Glass

Recovery and recycling of cathode ray tube (CRT) waste glasses has been the focus of research in the last decade, due to their environmental and economie issues (such as leaching of lead ions, high disposal costs). A sustainable method of valorizing this hazardous waste is to embed it in cement, as...

Full description

Saved in:
Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2020-12, Vol.616 (1), p.12048
Main Authors: Dumitru, Florina-Diana, Moncea, Mihaela-Andreea, Baraitaru, Andreea-Georgiana, Gheorghe, Petrache-Ionut, Stanciu, Silvius, Deák, György, Ahmad, Romisuhani
Format: Article
Language:English
Subjects:
Calcite
Calcium
Cathode ray tubes
Cement
Compression
Compressive strength
Construction materials
Ettringite
Flexural strength
Hardening
Hazardous wastes
Hydroxides
Leaching
Masonry
Mortars (material)
Scanning electron microscopy
Slabs
Slaked lime
Tensile strength
Video display terminals
X-ray spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Recovery and recycling of cathode ray tube (CRT) waste glasses has been the focus of research in the last decade, due to their environmental and economie issues (such as leaching of lead ions, high disposal costs). A sustainable method of valorizing this hazardous waste is to embed it in cement, as a substitute for the natural aggregate. Therefore, within the present study, ecological materials with cementitious matrix were synthesized by using glass waste recovered from cathode ray tube monitors (CRT glass), which replaced the aggregate in different proportions (varying from 10 to 30%), and by substituting 25% of cement with lime paste. The compression strength of the obtained specimens was determined after 1, 2, 7 and 28 days of hardening and highlighted that the samples with lower CRT glass substitution percentage performed relatively similar to the reference sample. This behavior can be explained by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The samples microstructure revealed the presence of ettringite, calcium hydroxides, hydrosilicates and hydroaluminates, calcite and some unreacted particles. The opportunity of using these materials in practical applications was assessed by developing masonry specimens - the obtained mortar paste was interposed between two brick slabs, which were mechanically tested after 7 days of hardening. Both splitting tensile strength and flexural strength varied with the increase of CRT glass in the composition.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/616/1/012048