Potential of municipal woody biomass waste ash in the production of cold-bonded lightweight aggregates

Lin, Jiayi; Mo, Kim Hung; Goh, Yingxin; Onn, Chiu Chuen

doi:10.1016/j.jobe.2022.105392

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…By using the cold-bonded approach, Jiayi L. et al [25] created a novel type of artificial lightweight aggregates from a type of municipal woody biomass waste ash (MWBA). Municipal woody biomass waste ash aggregate (MWBAA) performance was examined in relation to the effects of varying cement content 5, 10, 15, and 20%, curing time 3, 7, 14, and 28 days, and rotation speed 30, 40, 50, and 60 rpm on particle size fractions of fraction 4 mm-10 mm, 10 mm-16 mm, 16 mm-20 mm.…”

Section: Introductionmentioning

confidence: 99%

Physico-durability aspects of partial substitution via pelletized fly ash lightweight nano-silica concrete

Abbas¹,

Abbas²

2023

Res. Eng. Struct. Mater.

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This study's main goal is to examine the durability and shrinkage properties of high-performance lightweight concrete (HPLC) which uses lightweight synthetic fly ash instead of some natural coarse aggregate. By combining 90% fly ash and 10% Portland cement by weight in a tilted rotating pan at room temperature and curing the aggregate for 28 days, the synthetic aggregate was created using the cold bonded pelletization procedure. Then, ten combination samples were made using HPLCs by substituting natural coarse aggregate for fly ash aggregate at percentages of 0, 10, 20, 30, and 40% of the aggregate's total volume with a water binder (w/b) ratio of 0.35 both with and without the addition of nano-SiO2 (nS). Durability characteristics, rapid chloride penetration and water permeability, were tested for 28 and 90 days, while drying shrinkage and weight loss were examined for 61 days. Results demonstrated a lower performance with control mix in terms of durability and shrinkage characteristics with increasing the coarse aggregate replacement (%) of lightweight aggregate (LWA). Additionally, nS improved the transport qualities by reducing the porosity traits and detrimental effects of synthetic LWAs. On the other hand, nS particle-related permeability decreases up to 23.34% due to a larger surface area and smaller particle size that made a permeability channel more meandering or partially closed. HPLCs mixes greatly reduce the overall shrinkage strain when adding 3% nS to HPLC specimens by 11.73% over 61 days. The statistical models that were derived indicated that the independent variables have a statistically significant impact.

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Section: Introductionmentioning

confidence: 99%

Physico-durability aspects of partial substitution via pelletized fly ash lightweight nano-silica concrete

Abbas¹,

Abbas²

2023

Res. Eng. Struct. Mater.

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“…The reactivity of BFA is lower than OPC, and the mixture containing BFA usually increases the amount of water needed for maintaining the desired rheology of the fresh mixture [ 14 ]. It is known that the workability and mechanical strength of mixtures containing BFA depend on the dosage of BFA [ 14 , 15 ]. Fořt et al [ 8 ] investigated the basic physical and mechanical properties of concretes modified with large amounts of BFA produced by wood combustion, and the results showed that BFA can replace cement binders up to 20 wt.% without any significant loss of mechanical properties, and even higher doses are still acceptable for low-performance applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructural Features of Biomass Fly Ash-Modified Self-Compacting Coal Gangue-Filled Backfill

2023

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To achieve sustainable utilization of a large amount of mine solid waste, this study investigated the performance of self-compacting coal gangue-filled backfill (SCFB) containing biomass fly ash (BFA) generated from biomass power plants as a supplementary cementitious material (SCM). The correlations between the physical structure and compressive strength of SCFB samples were obtained by ultrasonic pulse velocity (UPV). The failure process of the SCFB samples was monitored by the digital image correlation (DIC) technique, and the stress–strain relationship and failure pattern were also analyzed. The micro-morphological structure and hydration products of SCFB samples were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and backscattered electron imaging (SEM-BSE). The results show that the usage of 30~40% BFA in SCFB improves the physical structure and strength of the samples. The compressive strength and UPV value of SCFB samples with different water-to-cement (w/c) ratios showed a similar trend of increasing and then gradually decreasing as the proportion of ordinary Portland cement (OPC) replaced by BFA increased. BFA exhibits better reactivity and filling effect in SCFB samples with a high w/c ratio. The peak stress of SCFB samples gradually decreases, and resistance to deformation gradually weakens with the increase in w/c ratios, while the DIC results further verify the mechanical experimental results. Microstructural analysis revealed that reducing the w/c ratio and incorporating specific ratios of BFA can reduce the thickness of the interface transition zone (ITZ) and porosity. The results of the study will provide theoretical guidance for the modification, stability monitoring, and strengthening of SCFB.

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Recycling water treatment sludge into a novel eco-friendly core–shell lightweight aggregate and its application

Mahanna,

Alaa,

Salah

et al. 2024

Clean Techn Environ Policy

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Disposal of water treatment sludge (WTS) has become an important issue of global environmental concern due to problems and costs. This study explored the feasibility of cold-bond methodology to produce an eco-friendly core–shell lightweight aggregate (LWA) from WTS, expanded perlite (EP), and cement. The effect of cement and WTS content on the properties of the LWA was studied. The findings revealed that the crushing strength, loose bulk density, 24-h water absorption, and 28-d water absorption of produced LWA ranged from 0.45 to 3.1 MPa, 1.05 to 1.25 g/cm3, 12.4 to 22%, and 22 to 27%, respectively. In addition, increasing the WTS content in the shell has a positive impact on the pH of the produced LWA. Furthermore, the SEM microstructure graphs revealed the efficient interference in the LWA particles between the cement–WTS composite and the perlite. The results also prove the possibility of using the produced LWA to produce structural lightweight concrete, with compressive strength, splitting tensile strength, and dry density of 24 MPa, 2.98 MPa, and 1840 kg/m3, respectively, with a consistent thermal conductivity of 0.72 W/m K and good acoustic insulation. Graphical abstract

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Potential of municipal woody biomass waste ash in the production of cold-bonded lightweight aggregates

Cited by 7 publications

References 39 publications

Physico-durability aspects of partial substitution via pelletized fly ash lightweight nano-silica concrete

Physico-durability aspects of partial substitution via pelletized fly ash lightweight nano-silica concrete

Mechanical Properties and Microstructural Features of Biomass Fly Ash-Modified Self-Compacting Coal Gangue-Filled Backfill

Recycling water treatment sludge into a novel eco-friendly core–shell lightweight aggregate and its application

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