Reuse of aluminosilicate industrial waste materials in the production of alkali-activated concrete binders

Alkali-activated products composed of industrial waste materials have shown promising environmentally friendly features with appropriate strength and durability. This study explores the mechanical properties and structural morphology of ternary blended alkali-activated mortars composed of industrial waste materials, including fly ash (FA), palm oil fly ash (POFA), waste ceramic powder (WCP), and granulated blast-furnace slag (GBFS). The effect on the mechanical properties of the Al2O3, SiO2, and CaO content of each binder is investigated in 42 engineered alkali-activated mixes (AAMs). The AAMs structural morphology is first explored with the aid of X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy measurements. Furthermore, three different algorithms are used to predict the AAMs mechanical properties. Both an optimized artificial neural network (ANN) combined with a metaheuristic Krill Herd algorithm (KHA-ANN) and an ANN-combined genetic algorithm (GA-ANN) are developed and compared with a multiple linear regression (MLR) model. The structural morphology tests confirm that the high GBFS volume in AAMs results in a high volume of hydration products and significantly improves the final mechanical properties. However, increasing POFA and WCP percentage in AAMs manifests in the rise of unreacted silicate and reduces C-S-H products that negatively affect the observed mechanical properties. Meanwhile, the mechanical features in AAMs with high-volume FA are significantly dependent on the GBFS percentage in the binder mass. It is also shown that the proposed KHA-ANN model offers satisfactory results of mechanical property predictions for AAMs, with higher accuracy than the GA-ANN or MLR methods. The final weight and bias values given by the model suggest that the KHA-ANN method can be efficiently used to design AAMs with targeted mechanical features and desired amounts of waste consumption.

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Assessing the sustainability potential of alkali-activated concrete from electric arc furnace slag using the ECO2 framework

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.122559 ◽

2021 ◽

Vol 281 ◽

pp. 122559

Author(s):

Hisham Hafez ◽

Dany Kassim ◽

Rawaz Kurda ◽

Rui Vasco Silva ◽

Jorge de Brito

Keyword(s):

Electric Arc Furnace ◽

Electric Arc ◽

Arc Furnace ◽

Electric Arc Furnace Slag ◽

Furnace Slag ◽

Alkali Activated Concrete ◽

Alkali Activated

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Review on the durability properties of sustainable alkali activated concrete

Materials Today Proceedings ◽

10.1016/j.matpr.2020.06.370 ◽

2020 ◽

Vol 33 ◽

pp. 1643-1649

Author(s):

Atul Garg ◽

Dhirendra Singhal ◽

Parveen

Keyword(s):

Durability Properties ◽

Alkali Activated Concrete ◽

Alkali Activated

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Mechanical degradation of ultra-high strength alkali-activated concrete subjected to repeated loading and elevated temperatures

Cement and Concrete Composites ◽

10.1016/j.cemconcomp.2021.104083 ◽

2021 ◽

Vol 121 ◽

pp. 104083

Author(s):

Le Huang ◽

Jin-Cheng Liu ◽

Rongjin Cai ◽

Hailong Ye

Keyword(s):

Elevated Temperatures ◽

High Strength ◽

Repeated Loading ◽

Mechanical Degradation ◽

Alkali Activated Concrete ◽

Alkali Activated

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Development of UHPC Mixtures Utilizing Natural and Industrial Waste Materials as Partial Replacements of Silica Fume and Sand

The Scientific World JOURNAL ◽

10.1155/2014/713531 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 6

Author(s):

Shamsad Ahmad ◽

Ibrahim Hakeem ◽

Mohammed Maslehuddin

Keyword(s):

Silica Fume ◽

Industrial Waste ◽

Steel Slag ◽

Limestone Powder ◽

Waste Materials ◽

Cement Kiln ◽

Test Results ◽

Strength Criteria ◽

Natural Pozzolana ◽

Kiln Dust

In the exploratory study presented in this paper, an attempt was made to develop different mixtures of ultrahigh performance concrete (UHPC) using various locally available natural and industrial waste materials as partial replacements of silica fume and sand. Materials such as natural pozzolana (NP), fly ash (FA), limestone powder (LSP), cement kiln dust (CKD), and pulverized steel slag (PSS), all of which are abundantly available in Saudi Arabia at little or no cost, were employed in the development of the UHPC mixtures. A base mixture of UHPC without replacement of silica fume or sand was selected and a total of 24 trial mixtures of UHPC were prepared using different percentages of NP, FA, LSP, CKD, and PSS, partially replacing the silica fume and sand. Flow and 28-d compressive strength of each UHPC mixture were determined to finally select those mixtures, which satisfied the minimum flow and strength criteria of UHPC. The test results showed that the utilization of NP, FA, LSP, CKD, and PSS in production of UHPC is possible with acceptable flow and strength. A total of 10 UHPC mixtures were identified with flow and strength equal to or more than the minimum required.

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