Analysis of autoclaved aerated concrete (AAC) blocks with reference to its potential and sustainability

Kamal, Mohammad Arif

doi:10.34118/jbms.v7i1.707

Cited by 27 publications

(16 citation statements)

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“…According to the literature, AAC is one of the confirmed green structures that permits the use of many raw material types in its manufacture. Some of these substitute materials are effective in reducing cement consumption in the production of AAC, thus leading to a reduction in greenhouse gases [76,77]. The characterization of QWF and ESP, in this study, revealed that these waste materials contain the key components for tobermorite synthesis such as SiO 2 and CaO.…”

Section: Discussionmentioning

confidence: 70%

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Saldia,

Bacosa,

Vegafria

et al. 2024

Sustainability

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Quarry waste fines and eggshells are unavoidable wastes which relentlessly contribute to environmental loads and pollution. Although many studies have suggested various methods for recycling, these wastes remain underutilized due to some technical constraints. In addition, no study has yet explored the possibility of combining quarry waste fines (QWF) and eggshell powder (ESP) for tobermorite synthesis. Tobermorite is the main component which primarily provides strength to autoclaved aerated concrete products. With this in mind, this study seeks to evaluate the potential of QWF-ESP mix at 10%, 15%, and 20% amounts of cement, respectively. The XRF, XRD, and TGA–DTA techniques were used to characterize the waste materials, while physical and mechanical property tests and XRD analysis were performed on the autoclaved samples. It was found that QWF contains 53.77% SiO2 and ESP contains 97.8% CaO which are key components for tobermorite synthesis. This study also revealed that the mixture with only 10% cement has the highest compressive strength among the QWF-ESP samples. Furthermore, the formation of tobermorite in the samples was confirmed through XRD analysis. Hence, the hydrothermal curing of QWF-ESP can be further developed to produce functional tobermorite-bearing materials.

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Section: Discussionmentioning

confidence: 70%

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Saldia,

Bacosa,

Vegafria

et al. 2024

Sustainability

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“…However, the clay brick is produced by drying and firing clay or shale raw material, forming a sintered porous structure [55], [56], [57]. Also, the AAC contains cement, but it is lightweight to mitigate the harmful environmental impacts [13] Turning to the three last scenarios, when adding the XPS to the three wall types, the environmental impacts have been increased by 1.24 𝑝𝑡, 1.86 𝑝𝑡, and 2.55 𝑝𝑡, that is, an incremental rate of 13%. The highest value among all scenarios is the sixth one, which is (4 𝑐𝑚 XPS + 20 𝑐𝑚 cement brick) composition.…”

Section: Single Score Resultsmentioning

confidence: 99%

“…Regarding the LCA of AAC and various wall materials, Kamal [13] has examined AAC blocks, emphasizing their sustainability and potential. The advantages of AAC blocks for the environment, including lower energy use and greenhouse gas emissions during production and use, have also been covered in the article.…”

Section: Literature Reviewmentioning

confidence: 99%

Environmental Impact Assessment of Composition Wall Materials Alternatives Ibny Baitak as a Case Study

Ali

2024

Sohag Engineering Journal

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This study investigated six wall composition material substitutes employed in constructing Egypt's Ibny Baitak Project for their potential environmental impact. Clay brick (20 cm), cement brick (20 cm), and autoclaved aerated concrete (AAC) (20 𝑐𝑚) blocks were the four materials evaluated. Each wall material is reinforced with (4 cm extruded polystyrene (XPS) insulation in the fourth, fifth, and sixth scenarios. The study used a life cycle assessment (LCA) technique to assess the environmental impact of these products from cradle to gate, including raw material extraction, processing, and transportation. The outcomes showed that the environmental effects of the four materials varied greatly regarding the three impact categories of potential global warming, non-renewable energy use, and respiratory pollution. Regarding the midpoint result, the AAC ranked second by 1.49 𝑝𝑡, followed by the cement bricks by 2.25 pt, with the clay brick recording the lowest environmental effect. The environmental impacts in the three final scenarios increased by 1.24 pt, 1.86 𝑝𝑡, and 2.55 𝑝𝑡, and an incremental rate of 13% when the XPS was added to the three wall types. The 20 𝑐𝑚 cement brick recorded the highest value, 8.40K KG Co 2 e, and the 4 cm XPS + 20 𝑐𝑚 cement brick composition recorded the lowest value, 1.97K KG Co 2 e. When considering the endpoint results, the cement brick recorded the highest values by 8.40K 𝐾𝐺 𝐶𝑜 2 e, which show climate change has the most significant impacts. Regarding the resource's depletion impact, cement bricks recorded the highest values with 138.42K Mj primay. The study's findings provide important details regarding the environmental effects of composition wall materials. They can influence decisions made in the construction sector, favoring greener building practices.

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“…Even though FAB is the per-cost price and is the cheapest among the bricks considering the number of bricks, the number of bricks is more compared to others, which does not give any economic benefits when the whole construction is considered. AACB are proven green structural material that may be used for commercial, contemporary, and private projects [41]. AACB's per piece cost is higher than other bricks.…”

Section: Description Of Life-cycle Assessment (Lca) Inputs Correspond...mentioning

confidence: 99%

Comparative analysis of cement-based bricks in India: a cradle-to-gate life cycle assessment

Sravani,

Ramani,

Anbu

2024

Eng. Res. Express

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The main aim of this study is to quantify the environmental impact caused by different types of bricks used in the Indian construction field. This study considered four brick types: Autoclave Aerated Concrete, Fly ash, and Cellular Foam bricks. The prime objectives of the investigation are to evaluate and compare the embodied energy and resource depletion by modelling the environmental impact of the bricks by Global Warming Potential (GWP) with the LCA software SimaPro. The study's use of a cradle-to-gate approach provides a comprehensive understanding of the environmental implications associated with four types of bricks. Moreover, the analysis conducted using SimaPro 8.1 software with the life cycle ReCiPe 2016 v1.1 and IMPACT 2002+ v2.15 demonstrates the rigour and accuracy of the findings. The results indicate that cement bricks have the lowest Global Warming Potential, specific heat, and cost, making them a more environmentally and economically friendly option than other bricks. Furthermore, weight, water absorption, density, thermal conductivity, and compressive strength were also analyzed and showed other better-performing bricks.

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Analysis of autoclaved aerated concrete (AAC) blocks with reference to its potential and sustainability

Cited by 27 publications

References 0 publications

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Environmental Impact Assessment of Composition Wall Materials Alternatives Ibny Baitak as a Case Study

Comparative analysis of cement-based bricks in India: a cradle-to-gate life cycle assessment

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