Green alkali-activated mortar: Sustainable use of discarded cathode-ray tube glass powder as precursor

Long, Wu-Jian; Li, Hao-Dao; Yuan, Fang; Xing, Feng

doi:10.1016/j.jclepro.2019.05.066

Cited by 26 publications

(19 citation statements)

References 46 publications

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“…The compressive strength of samples containing fly ash was more than two times lower than that of samples with pure CRT glass. In contrast, Long et al [ 34 ] reported that both flexural and compressive strengths of slag-based geopolymers decreased monotonically with the increase in CRT glass. However, the drop is not linear.…”

Section: Discussionmentioning

confidence: 94%

“…Introducing CRT glass into the geopolymer mixture has not been very popular so far, but a lot of scientists successfully encapsulated separate heavy metals within the geopolymer matrix [ 37 , 59 , 60 , 61 , 62 , 63 ]. Many scientific investigations prove also similar capabilities of concrete for the encapsulation of lead from CRT glass and substantial reductions in Pb leaching [ 16 , 18 , 19 , 34 ].…”

Section: Discussionmentioning

confidence: 97%

“…Scientists explain that the pozzolanic activity of CRT glass is lower than the pozzolanic activity of slag. As an effect, the geopolymerization process is slower and less geopolymerization products are present in a matrix that has repercussions on the strength of a hardened material [ 34 ]. Tomas Opletal [ 51 ] also reported a decrease in compressive strength with an increase in CRT glass content.…”

Section: Discussionmentioning

confidence: 99%

“…Recent works concern the possibility of CRT glass powder addition to the geopolymer mixture preferably. Long et al [ 34 ] researched the possibility of utilization of CRT glass as a partial replacement of the precursor in alkali-activated slag mortars. According to the tests, the presence of CRT does not affect the compressive strength severely.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Metakaolin-Based Geopolymer with Cathode Ray Tube Glass

et al. 2021

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Geopolymers can be treated as an environmentally friendly alternative for concrete and enables utilization of various wastes. This paper focuses on the possibility of application of discarded cathode ray tube (CRT) glass inside a metakaolin-based geopolymer in the form of an aggregate, providing an ecological method of recycling of this hazardous material. The main goal of this paper was to develop an optimal composition of a new geopolymer and to describe its behavior under varying curing conditions. A geopolymer made of different mixtures was subjected to flexural and compressive strength tests. The density, mass loss, temperature changes, and metals leaching were determined as well. The results demonstrated that neither the content of CRT glass nor the curing regime has a significant influence on the mechanical behavior. However, the strength of the geopolymer containing 50% CRT glass by mass increased with time in contrast to a geopolymer with a higher CRT glass content. The development of temperature inside the mixture was dependent on the amount of metakaolin. The concentration of toxic metals in an aqueous extract decreased considerably after the encapsulation of CRT glass inside the geopolymer. The presented results indicate that discarded CRT glass can be considered an aggregate for a metakaolin-based geopolymer. The new material shows high strength and makes the CRT glass safe for the environment.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of Metakaolin-Based Geopolymer with Cathode Ray Tube Glass

et al. 2021

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“…The most common applications of the waste glass are related to the manufacturing of different products like conventional ceramics, aggregates and cements [ 19 , 20 ]. Some of the technologies involve high temperature treatment of the CRT waste glass leading to ceramic or glass composites used in the construction industry, mainly to manufacture bricks and roof tiles [ 21 , 22 ]. The CRT waste glass cullet can be also used in the metallurgical industry to produce ferro-silicates in the form of slag [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical–Electrochemical Process Concept for Lead Recovery from Waste Cathode Ray Tube Glass

et al. 2021

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This paper presents a novel approach for the recovery of lead from waste cathode-ray tube (CRT) glass by applying a combined chemical-electrochemical process which allows the simultaneous recovery of Pb from waste CRT glass and electrochemical regeneration of the leaching agent. The optimal operating conditions were identified based on the influence of leaching agent concentration, recirculation flow rate and current density on the main technical performance indicators. The experimental results demonstrate that the process is the most efficient at 0.6 M acetic acid concentration, flow rate of 45 mL/min and current density of 4 mA/cm2. The mass balance data corresponding to the recycling of 10 kg/h waste CRT glass in the identified optimal operating conditions was used for the environmental assessment of the process. The General Effect Indices (GEIs), obtained through the Biwer Heinzle method for the input and output streams of the process, indicate that the developed recovery process not only achieve a complete recovery of lead but it is eco-friendly as well.

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