Critical parameters affecting the thermal resistance of alkali-activated aluminosilicate wastes: Current understanding and future directions

Abbass, Ahmed Mohamed; Elrahman, Mohamed Abd; Abdel‐Gawwad, Hamdy A.; Stephan, Dietmar

doi:10.1007/s11356-023-28336-9

Cited by 2 publications

(1 citation statement)

References 179 publications

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“…It is a prospective alternative to OPC concrete to diminish carbon discharged during cement production [23][24]. It depends on the reaction of aluminosilicate with an alkaline solution producing a hardened product [25][26][27]. The synthesis of GPC involved the addition of byproducts [28,29].…”

Section: Introductionmentioning

confidence: 99%

The Efficiency of By-product- Based Geo-polymer Concrete

El-Nadoury

2023

Port-Said Engineering Research Journal

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Geo-polymer concrete (GPC) and industrial byproducts have developed expeditiously as eco-benevolent substitutes for OPC. Whereas elevated curing temperature is essential. This research studies the applicability of producing byproduct-based GPC cured under ambient temperature. The effect of the incorporation of ceramic squander powder (CSP) and rice husk ash (RHA) is assessed. All the investigated mixtures contain 40% Slag, 10% fly ash (FA), and a 50% combination of CSP and RHA. Four different combinations of CSP/RHA; 10/40, 20/30, 30/20, and 40/10 are utilized. w/b ratios; 0.3, 0.4, and 0.45 are tested. Compressive, splitting tensile, and flexural strengths are examined as indicators of mechanical properties. Acid resistance, water absorption, sorptivity, and chloride permeability are evaluated as indicators of durability aspects. The results revealed that the 30/20 combination is optimum in terms of mechanical properties, while all combinations attained applicable durable properties compared to the control mix with 90% slag and 10% FA.

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Section: Introductionmentioning

confidence: 99%

The Efficiency of By-product- Based Geo-polymer Concrete

El-Nadoury

2023

Port-Said Engineering Research Journal

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Exploring the influence of carbonate minerals on the performance, volume stability, and phase composition of alkali‐activated waste glass binder at high temperatures

Shereiqi,

Al‐Jabri,

Meddah

et al. 2024

Structural Concrete

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Alkali‐activated waste glass (AA‐WG) has received much attention because to its high mechanical properties achieved with low energy demand. However, AA‐WG exhibits low stability, including volume expansion, porosity increment, and a reduction in compressive strength. Enhancing the stability of AA‐WG could improve its commercial viability and expand its range of applications. Therefore, this study aims to evaluate the role of calcite CaCO3 (CC) and magnesite MgCO3 (MC) in enhancing the physicomechanical properties and phase composition of AA‐WG at elevated temperatures. The proposed strategy includes replacing WG with different contents of CC and MC, followed by activation with a 4 M NaOH solution and curing at 100°C for 24 h. The hardened samples were then exposed to 800°C for a 2 h holding time to evaluate the thermal stability of the AA‐WG, AA‐WG‐CC, and AA‐WG‐MC mixtures. The results demonstrated that increasing the CC content up to 50 wt.% significantly enhanced the compressive strength of the AA‐WG when cured at 100°C, while the incorporation of MC caused a negative effect. Surprisingly, an opposite trend was observed at a higher temperature of 800°C, where the samples containing MC exhibit better mechanical and physical performance compared to those with CC. The variation in the type, composition, and weight loss upon ignition of the carbonate‐based minerals significantly influenced the stability and phase composition of the thermally exposed AA‐WG. Although the sample with 50 wt.% MC showed higher volume shrinkage, it demonstrated higher compressive strength (~82 MPa) at 800°C than the sample with 50 wt.% CC (~7 MPa). This difference can be attributed to the formation of diopside CaMgSi2O6 and forsterite Mg2SiO4, which have higher crystallinity, specific gravity, and hardness compared to wollastonite CaSiO3 and the tri‐calcium silicate phases Ca3SiO4.

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Critical parameters affecting the thermal resistance of alkali-activated aluminosilicate wastes: Current understanding and future directions

Cited by 2 publications

References 179 publications

The Efficiency of By-product- Based Geo-polymer Concrete

The Efficiency of By-product- Based Geo-polymer Concrete

Exploring the influence of carbonate minerals on the performance, volume stability, and phase composition of alkali‐activated waste glass binder at high temperatures

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