Properties of one-part fly ash/slag-based binders activated by thermally-treated waste glass/NaOH blends: A comparative study

Samarakoon, M.H.; Ranjith, P.G.; Duan, Wenhui; Silva, V.R.S. De

doi:10.1016/j.cemconcomp.2020.103679

Cited by 71 publications

(28 citation statements)

References 60 publications

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“…This is partly due to the lower CO 2 emission during geopolymerization processes compared to the use of Portland Cement [23,24]. Sodium hydroxide (NaOH) and potassium hydroxide (KOH) are alkali-activation solutions commonly used for geopolymerization processes at low temperatures [25][26][27][28]. Sodium hydroxide has been observed to improve the geopolymerization process more than potassium hydroxide due to its smaller sodium ions [29].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics

et al. 2021

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The quantity of polymer waste in our communities is increasing significantly. It is therefore necessary to consider reuse or recycling waste to avoid an increase in the risk to public health. This project is aimed at using pulverized low-density polyethylene (LDPE) waste as a source to reinforce and improve compressive strength, and to reduce the water absorption of geopolymer ceramics (GC). Clay:LDPE composition consisting of 5%, 10%, and 15% LDPE was geopolymerized with an NaOH/Na2SiO3 solution and cured at 30 °C and 50 °C. Characterization of the geopolymer samples was carried out using XRF and XRD. The microstructure was analyzed by SEM and chemical bonding by FTIR. The SEM micrographs showed LDPE particle pull-out on the geopolymer ceramics’ fracture surface. The result showed that the compressive strength increases with the addition of pulverized polymer waste compared to the controlled without LDPE addition. Water absorption decreased with an increase in LDPE addition in the geopolymer ceramics composite.

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Section: Introductionmentioning

confidence: 99%

The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics

et al. 2021

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“…WG-based activator gave lower early strength (1-day) but equal or superior 7 and 28-day strengths than the commercially available activating solutions. Since the method was proposed, it has been replicated and verified by several researchers (see, e.g., [16]), using other silicate sources (e.g., [17,18]), and providing environmental analysis confirming a potential for a 70% reduction in CO 2 emissions when compared to Portland cement-based concrete [19,20]. However, a detailed investigation of the microstructure of the reaction products when a WG-based activator is used has not been carried out yet.…”

Section: Introductionmentioning

confidence: 99%

Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate

Bondar¹,

Vinai

2022

Crystals

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Sodium silicate is commonly used for activating alumina silicates to produce alkali-activated binders that can compete with conventional Portland cement in concrete. However, the cost and emissions related to activators can hinder the use of alkali-activated materials in the industry. The novel, waste-based activators have been developed in the last years, using Si-rich waste streams. Processing waste glass cullet not only reduces the glass landfill disposal but also allows the production of sodium silicate for alkali activation. In this article, the chemical and microstructural properties of neat fly ash and blended 60 fly ash/40 slag pastes activated by sodium silicate produced from glass cullet were studied and compared to equivalent ones activated by commercially available sodium silicate and sodium hydroxide solutions. Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX) were used to determine the microstructure and composition of the gel phase. Findings have confirmed that pastes activated by the processed waste glass showed chemical and microstructural properties comparable to pastes produced with commercially available activators.

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“…Waste-derived silicate activators for AAM have been proposed, demonstrating the suitability of such alternative activators both in terms of mechanical strength development [5][6][7] and environmental as well as economic benefits. [8][9][10] Several sources of waste-derived silicates have been investigated in the literature for their use as activators. 11 Mining waste such as iron ore tailings, 12 glass waste, 7,13 and silica fume 14,15 are among the inorganic Si-rich waste streams successfully utilized for the production of activators for AAM.…”

Section: Introductionmentioning

confidence: 99%

“…Nanopowders used in AAM technology, 44 metallurgy, 45 and glass technology 46 have been successfully obtained even from waste or by‐products. Waste‐derived silicate activators for AAM have been proposed, demonstrating the suitability of such alternative activators both in terms of mechanical strength development 5–7 and environmental as well as economic benefits 8–10 …”

Section: Introductionmentioning

confidence: 99%

Bio‐derived sodium silicate for the manufacture of alkali‐activated binders: Use of bamboo leaf ash as silicate source

Vinai

Ntimugura

Cutbill

et al. 2022

Int J Applied Ceramic Tech

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Alkali activated binders are a promising alternative to the use of Portland cement in the manufacture of concrete for curbing CO2 emissions. Novel sources of silicates have been investigated in recent years for reducing cost and environmental impacts associated with the use of chemical activators. This study describes the production of solid sodium silicate (SS) activating powder from bamboo leaf ash (BLA). Bamboo leaves were calcined at 550–800°C, mixed with NaOH pellets, and heated in an oven at 300°C. The obtained silicate powder was used for activating blended fly ash/slag samples. Mechanical and microstructural properties of BLA‐based samples were compared to those of samples made with commercially available chemicals. The strength of BLA‐activated mortars matched the commercially‐sourced activators, being 25–30 MPa at 7 days and exceeding 40 MPa at 28 days. The microstructural analysis suggested that BLA‐based SS showed a lesser degree of dissolution of precursors at 7 days, but the quality of the matrix was higher than that of NaOH‐activated samples. These results confirmed that the reactivity of BLA‐silicate powder was similar to that of commercial SS solutions, and show the potential valorization of future biomass renewable waste in the production of low carbon, alkali‐activated concretes.

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Properties of one-part fly ash/slag-based binders activated by thermally-treated waste glass/NaOH blends: A comparative study

Cited by 71 publications

References 60 publications

The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics

The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics

Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate

Bio‐derived sodium silicate for the manufacture of alkali‐activated binders: Use of bamboo leaf ash as silicate source

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