Effects of red mud on workability and mechanical properties of autoclaved aerated concrete (AAC)

Song, Yufeng; Dong, Minghao; Qian, Xiaoqian; Yan, Dongming; Shen, Siyi; Zhang, Lifeng; Sun, Guangcheng; Lai, Junying; Ruan, Shaoqin

doi:10.1016/j.jobe.2022.105238

Cited by 17 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, aggregates were separated from binders to avoid any quartz contamination. Then the paste segments were stored in ethanol for 3 days to stop their hydration, 29–31 followed by vacuum drying (40°C) for another 3 days. The dried samples were ground to pass a sieve size of 75 μm before the microstructural analysis.…”

Section: Methodsmentioning

confidence: 99%

Understanding the role of seeds in reactive magnesia cement (RMC) formulations

et al. 2023

View full text Add to dashboard Cite

Nucleation effects of seeds in reactive magnesia cement (RMC) systems have been reported, but this process has never been directly observed. In this study, different types and contents of seeds were introduced in RMC formulations. Resultsshow that seeded RMC samples revealed accelerated hydration/carbonation that led to their more rapid strength development, and the use of magnesite outperformed other seeds given their overall performances, as explained by their more homogenous microstructures. Further, in the model solution, the amount of Mg2+ ions adsorbed onto seeds particles continuously increased with the increment of Mg2+ concentrations, confirming the nucleation effects of seeds in RMC formulations directly, and seeds surfaces revealed a much higher affinity for Mg2+ ions than other ions due to their acid-base interactions. Therefore, the use of seeds could act as accelerators that shorten the curing period of RMC-based concrete products on a large scale.

show abstract

Section: Methodsmentioning

confidence: 99%

Understanding the role of seeds in reactive magnesia cement (RMC) formulations

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The compressive strength and dry density of the SAC-NAAC sample were 3.55 MPa and 624 kg/m 3 , respectively. An increase in the watercement ratio led to surplus water, which contributed to void formation, thereby widening the porosity of the SAC-NAAC and diminishing the strength of the material [15]. However, the specific strength initially increased and later decreased with increasing the water-cement ratio.…”

Section: Effect Of Water-cement Ratio On the Properties Of Sulfoalumi...mentioning

confidence: 99%

Preparation and Characterization of Novel Sulfoaluminate-Cement-Based Nonautoclaved Aerated Concrete

Peng,

Chen,

Jiu

et al. 2024

Materials

View full text Add to dashboard Cite

The production of autoclaved aerated concrete via the autoclaving process incurs substantial energy consumption, posing a challenge to sustainable economic development. Herein, a novel nonautoclaved aerated concrete (NAAC) was prepared using sulfoaluminate cement as the primary raw material and aluminum powder as the aerating agent. The physicomechanical characteristics and pore structures of the sulfoaluminate-cement-based (SAC) NAAC (SAC-NAAC) were examined through X-ray diffraction, thermogravimetry, and scanning electron microscopy. The findings revealed that the optimal mechanical attributes of the SAC-NAAC were achieved at a water–cement ratio of 0.55, with a specific content ratio of polycarboxylate superplasticizer–borax–calcium stearate–sodium hydroxide at 0.24%:0.32%:0.36%:2.90%, along with 0.40% aluminum powder. The SAC-NAAC samples, with a bulk density range of 600–750 g/m3, exhibited a compressive strength of 3.55–4.16 MPa, porosity of 45.9–63.5%, and water absorption rate of 60.2–74.4%. The weight loss in the SAC-NAAC with different aluminum powder contents ranged between 15.23% and 16.83%. The prismatic ettringite (AFt) crystals served as the main source of strength for the SAC-NAAC, and AH3 was attached to the AFt surfaces in a microcrystalline gel phase, thereby further enhancing the strength of the SAC-NAAC. Thus, the lightweight, high-strength SAC-NAAC has great potential as a nonautoclaved aerated concrete.

show abstract

“…To compensate for this effect, RM content in AAC should be limited to 22.5 wt.% of fly ash content and water to solid ratio should be modified, as concluded by Song, et al. [65h] . Nikbin, et al [65i] .…”

Section: Rm In Construction and Building Materialsmentioning

confidence: 99%

Characterization and Applications of Red Mud, an Aluminum Industry Waste Material, in the Construction and Building Industries, as well as Catalysis

Al-Fakih

Nor

Basha

et al. 2023

The Chemical Record

View full text Add to dashboard Cite

The disposal of red mud (RM), a waste material generated by the aluminum industry, remains a global environmental concern because of its high alkalinity and smaller particle size, which have the potential to pollute air, soil, and water. Recently, efforts have been made to develop a strategy for reusing industrial byproducts, such as RM, and turning waste into value‐added products. The use of RM as (i) a supplementary cementitious material for construction and building materials, such as cement, concrete, bricks, ceramics, and geopolymers, and (ii) a catalyst is discussed in this review. Furthermore, the physical, chemical, mineralogical, structural, and thermal properties of RM, as well as its environmental impact, are also discussed in this review. It is possible to conclude that using RM in catalysis, cement, and construction industries is the most efficient way to recycle this byproduct on a large scale. However, the low cementitious properties of RM can be attributed to a reduction in the fresh and mechanical properties of composites incorporating RM. On the other hand, RM can be used as an efficient active catalyst to synthesize organic molecules and reduce air pollution, which not only makes use of solid waste but also lowers the price of the catalyst. The review provides basic information on the characterization of RM and its suitability in various applications, paving the way for more advanced research on the sustainable disposal of RM waste. Future research perspectives on the utilization of RM are also addressed.

show abstract

Effects of red mud on workability and mechanical properties of autoclaved aerated concrete (AAC)

Cited by 17 publications

References 33 publications

Understanding the role of seeds in reactive magnesia cement (RMC) formulations

Understanding the role of seeds in reactive magnesia cement (RMC) formulations

Preparation and Characterization of Novel Sulfoaluminate-Cement-Based Nonautoclaved Aerated Concrete

Characterization and Applications of Red Mud, an Aluminum Industry Waste Material, in the Construction and Building Industries, as well as Catalysis

Contact Info

Product

Resources

About