Influence of spherical and crushed waste Cathode-Ray Tube (CRT) glass on lead (Pb) leaching and mechanical properties of concrete

Pauzi, Nurul Noraziemah Mohd; Jamil, Maslina; Hamid, Roszilah; Abdin, A. Z.; Zain, Muhammad Fauzi Mohd.

doi:10.1016/j.jobe.2018.10.024

Cited by 30 publications

(14 citation statements)

References 35 publications

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“…The lower rate of expansion of TS mortars was attributed to the rough texture and angularity of aggregates, which provided a denser microstructure. This has been reported by other researchers [29,30]. However, the contribution of the fine aggregate's hardness contributed to the compactness observed in TS50 mortars.…”

Section: Alkali-silica Reactivitysupporting

confidence: 82%

Mechanical Properties of Tin Slag Mortar

et al. 2021

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The increased demand for cement mortar due to rapid infrastructural growth and development has led to an alarming depletion of fine aggregate. This has prompted the need for a more sustainable material as a total/partial replacement for natural fine aggregate. This study proposes the use of tin slag (TS) as a replacement for fine aggregate in concrete to bridge this sustainability gap. TS was used to replace fine aggregate at replacement levels of 0%, 25%, 50%, 75%, and 100% in cement mortar. Fresh and hardened properties of TS mortar were obtained. Flow tests showed that, as the TS quantity and the w/c ratio increased, the mortar flow increased. Similarly, the compressive strength increased as the TS replacement increased up to 50% replacement, after which a decline in strength was observed. However, with the TS replacement of fine aggregate up to 100%, a compressive strength of 6% above control was attained. The morphological features confirm that specimens with TS had a denser microstructure because of its shape characteristics (elongated, irregular, and rough), and, thus, plugged holes better than the control mortar. The natural sand’s contribution to strength was a result of better aggregate hardness as compared to TS. Hence, TS can be used as alternative for fine aggregate in sustainable construction.

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Section: Alkali-silica Reactivitysupporting

confidence: 82%

Mechanical Properties of Tin Slag Mortar

et al. 2021

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“…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%

“…According to the different studies, the total replacement of natural aggregate with a CRT aggregate can cause a decrease in compressive strength by 10–27% [ 12 , 13 , 14 , 15 , 16 ], a decrease in flexural strength by 26–40% [ 13 , 14 ], and a fall in splitting tensile strength by 10–23% [ 12 , 15 , 16 ]. CRT glass was used as a replacement of fine aggregate in most studies [ 12 , 13 , 14 , 15 ] and as a replacement of a coarse aggregate in one case [ 16 ]. There are also papers reporting an increase in compressive and flexural strength after overall or partial (100% or 80% by weight) replacement of natural fine aggregates (sand) with CRT glass [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, regardless of declines in performance, the strength of a geopolymer containing only CRT glass as an aggregate was high enough for building applications. Depending on the composition of a mixture, the compressive strength of elements ranged from 20 MPa to 52 MPa [ 12 , 13 , 14 , 16 , 17 ]. The increase in CRT glass content causes an increase by 2–4% in the density of the concrete [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…The increase in CRT glass content causes an increase by 2–4% in the density of the concrete [ 12 , 13 , 14 ]. The addition of CRT glass increases the workability of the cement mortar [ 14 , 16 , 20 ], decreases shrinkage [ 12 , 20 ] and water absorption [ 15 , 20 ], and increases the chloride penetration resistance [ 21 ]. Many researches indicate an increase in expansion due to the alkali–silica reaction [ 20 ].…”

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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Use of Crushed Waste Glass (CWG) for Partial Replacement of Fine Aggregate in Concrete Production: A Review

Johari

Sharma

2021

Lecture Notes in Civil Engineering

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Influence of spherical and crushed waste Cathode-Ray Tube (CRT) glass on lead (Pb) leaching and mechanical properties of concrete

Cited by 30 publications

References 35 publications

Mechanical Properties of Tin Slag Mortar

Mechanical Properties of Tin Slag Mortar

Characteristics of Metakaolin-Based Geopolymer with Cathode Ray Tube Glass

Use of Crushed Waste Glass (CWG) for Partial Replacement of Fine Aggregate in Concrete Production: A Review

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