Performance of lightweight foamed concrete partially replacing cement with industrial and agricultural wastes: Microstructure characteristics, thermal conductivity, and hardened properties

Mydin, Md Azree Othuman; Hamah Sor, Nadhim; Althoey, Fadi; Özkılıç, Yasin Onuralp; Abdullah, Mohd Mustafa Al Bakri; Isleem, Haytham F.; Deifalla, Ahmed Farouk; Tawfik, Taher A.

doi:10.1016/j.asej.2023.102546

Cited by 10 publications

(4 citation statements)

References 59 publications

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“…The results of this study indicate that when including SDA as a substitute for cement, with a maximum replacement proportion of 20%, there was a significant reduction in the sorptivity of the FM specimens. The observed decreases in the water capillary absorption rates may be related to the action of surface tension in efficiently occupying the small pores and capillaries [22]. The sorptivity of the FM exhibited an increase when the replacement of cement with SDA exceeded 30%.…”

Section: Sorptivitymentioning

confidence: 90%

“…Implementing FM has the capacity to significantly decrease the total weight of a building, hence potentially reducing the risk of damage caused by earthquakes [17][18][19][20]. Furthermore, the implementation of FM significantly reduced the consumption of cement and aggregate materials [21,22]. It has been noted that the cement production process contributes to around 6% of the total global carbon dioxide (CO 2 ) emissions.…”

Section: Introductionmentioning

confidence: 99%

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Formulating Eco-Friendly Foamed Mortar by Incorporating Sawdust Ash as a Partial Cement Replacement

Majeed

2024

Sustainability

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Utilizing sawdust efficiently to produce construction materials can help safeguard the environment and decrease costs by minimizing the need for traditional resources and reducing carbon dioxide (CO2) emissions. Additionally, recycling sawdust plays an essential role in creating a sustainable ecosystem. Hence, this study aimed to examine the potential use of sawdust ash (SDA) as a partial cement replacement on foamed mortar (FM) properties, including its fresh, mechanical, transport, thermal, and microstructural properties. A variety of FM mixtures were tested for workability, density, consistency, intrinsic air permeability, porosity, split tensile strength, compressive strength, flexural strength, and thermal conductivity by replacing cement with SDA at varying percentages of 0%, 10%, 20%, 30%, 40%, and 50%. The results revealed that FM’s workability was reduced by the introduction of SDA with a higher percentage cement replacement, while the density of the FM mixtures was reduced due to SDA’s specific gravity being lower than that of cement. A linear improvement was observed in the air permeability, sorptivity, and porosity of FM–SDA composites with an increased SDA percentage to 20%. It is notable that these properties started to deteriorate once the cement replacement by SDA surpassed 30%. A noticeable improvement of mechanical strength properties of the FM was found at 20% of SDA content, but they deteriorated when the SDA content was more than 30%. FM blends with higher SDA contents exhibited larger and more apparent voids, according to SEM analysis. In conclusion, incorporating sawdust into formulations emerges as a viable method for FM production. This approach not only mitigates the environmental impact of sawdust disposal but also reduces the need for extracting natural resources in construction material manufacturing.

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Section: Sorptivitymentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Formulating Eco-Friendly Foamed Mortar by Incorporating Sawdust Ash as a Partial Cement Replacement

Majeed

2024

Sustainability

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“…To solve this problem, the thermal insulation performance of cement-based porous materials must be improved from the perspective of pore structure optimization [7]. However, the thermal conductivity of porous cement-based materials remains high due to the large thermal conductivity value of the cement-based matrix and the fact that the decreased percentage of thermal conductivity caused by pore structure optimization is highly limited [8,9]. Moreover, high porosity or low density can also be used to reduce thermal conductivity and improve thermal insulation ability [10,11], since the thermal conductivity of the increased phase (air) is extremely low.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Yang,

Chen

et al. 2024

Materials

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The organic modification of montmorillonite was successfully achieved using cetyltrimethyl ammonium bromide under facile conditions. The modified montmorillonite was subsequently used for the fabrication of montmorillonite-induced nanopore-rich cement paste (MNCP), and the shrinkage behavior and fundamental performance of MNCP were also investigated. The results indicate that alkali cations on a montmorillonite layer surface were exchanged by using CTAB under 80 °C, successfully achieving the organic modification of montmorillonite. As a pore-forming agent, the modified montmorillonite caused a reduction in shrinkage: the 28-day autogenous shrinkage at a design density of 400 kg/m3 and 800 kg/m3 was reduced to 2.05 mm/m and 0.24 mm/m, and the highest reduction percentages during the 28-day drying shrinkage were 68.1% and 62.2%, respectively. The enlarged interlamellar pores and hydrophobic effects caused by the organic modification of montmorillonite aided this process. Organic-modified montmorillonite had a minor influence on dry density and thermal conductivity and could contribute to an enhancement of strength in MNCP.

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“…4,5 Lightweight concrete is mainly prepared from lightweight aggregates and cementitious materials. 6,7 The sources of light aggregates can be classified as natural light aggregates (pumice, 8 volcanic ash 9 ), industrial wastes (expanded slag beads, 10 fly ash ceramic granules 11,12 ), and man-made light aggregates (ceramic pellets, 13 shale pellets 14 ). The filling of lightweight aggregates forms a porous structure within the lightweight concrete, reducing the density of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Compressive Properties of Basalt Fibers and Polypropylene Fiber-Reinforced Lightweight Concrete

Xu,

Yan,

Jiang

et al. 2024

ACS Omega

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Performance of lightweight foamed concrete partially replacing cement with industrial and agricultural wastes: Microstructure characteristics, thermal conductivity, and hardened properties

Cited by 10 publications

References 59 publications

Formulating Eco-Friendly Foamed Mortar by Incorporating Sawdust Ash as a Partial Cement Replacement

Formulating Eco-Friendly Foamed Mortar by Incorporating Sawdust Ash as a Partial Cement Replacement

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Compressive Properties of Basalt Fibers and Polypropylene Fiber-Reinforced Lightweight Concrete

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