Influence of Fly Ash Properties on Characteristics of Manufactured Angular Fly Ash Aggregates

Kamal, Jyoti; Mishra, Uttam Kumar

doi:10.1007/s40030-020-00461-5

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…In comparison to natural aggregates, the specific gravity of artificial geopolymer aggregates formed by sintering is quite low [ 21 ]. For instance, Kamal and Mishra (2020) [ 60 ] reported on the specific gravity of the fly ash aggregates as well as raw materials, including fly ash and binder, and the amount of void space in the aggregate. In addition, whenever cold-bonded aggregate was combined with other pozzolanic binding materials, such as GGBS, the specific gravity was found to be as high as 2.42, in which the hydrated lime acts as a primary binder [ 61 ].…”

Section: Physical and Mechanical Properties Of Lightweight Aggregatementioning

confidence: 99%

“…In addition, regardless of methods applied, the cold-bonded fly ash aggregate, sintered fly ash aggregate, as well as autoclaved aggregates were found to have a high impact value of 9.56%, 10.2%, and 11.46%, respectively [ 71 ]. According to research of Kamal and Mishra (2020) [ 60 ], the addition of binder is noted as effective due to the binder’s role, which is to wrap the pellets, therefore causing the voids to have better resistance to compression. Meanwhile, the addition of styrene–butadiene rubber (SBR) to lightweight aggregate leads to a lower impact value, which makes the aggregate stronger [ 35 ].…”

Section: Physical and Mechanical Properties Of Lightweight Aggregatementioning

confidence: 99%

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Artificial Lightweight Aggregates Made from Pozzolanic Material: A Review on the Method, Physical and Mechanical Properties, Thermal and Microstructure

et al. 2022

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As the demand for nonrenewable natural resources, such as aggregate, is increasing worldwide, new production of artificial aggregate should be developed. Artificial lightweight aggregate can bring advantages to the construction field due to its lower density, thus reducing the dead load applied to the structural elements. In addition, application of artificial lightweight aggregate in lightweight concrete will produce lower thermal conductivity. However, the production of artificial lightweight aggregate is still limited. Production of artificial lightweight aggregate incorporating waste materials or pozzolanic materials is advantageous and beneficial in terms of being environmentally friendly, as well as lowering carbon dioxide emissions. Moreover, additives, such as geopolymer, have been introduced as one of the alternative construction materials that have been proven to have excellent properties. Thus, this paper will review the production of artificial lightweight aggregate through various methods, including sintering, cold bonding, and autoclaving. The significant properties of artificial lightweight aggregate, including physical and mechanical properties, such as water absorption, crushing strength, and impact value, are reviewed. The properties of concrete, including thermal properties, that utilized artificial lightweight aggregate were also briefly reviewed to highlight the advantages of artificial lightweight aggregate.

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Section: Physical and Mechanical Properties Of Lightweight Aggregatementioning

confidence: 99%

Section: Physical and Mechanical Properties Of Lightweight Aggregatementioning

confidence: 99%

Artificial Lightweight Aggregates Made from Pozzolanic Material: A Review on the Method, Physical and Mechanical Properties, Thermal and Microstructure

et al. 2022

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Environmental and geotechnical properties of lightweight aggregates made of reused solid wastes

Porcino

Tomasello

Mauriello

et al. 2024

Environmental Geotechnics

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In the present research, a comprehensive experimental investigation was carried out for the geotechnical characterisation of new synthetic lightweight aggregates (SLAs) composed of reused biomass fly ash and waste plastics (i.e. high-density and low-density polyethylene, i.e. HDPE and LDPE). Aggregate fly ash-to-plastic ratio, by weight, was 50:50. Both aggregates were characterised by low specific gravity values, i.e. 0.98. The physical, chemical and mechanical properties (i.e. one-dimensional compressibility, creep properties, compaction features and stress-strain-strength behavior) of lightweight aggregates were evaluated together with hydraulic conductivity and water absorbability. Based on one-dimensional compression test results, lightweight aggregates made of fly ash and HDPE resulted to be less compressible upon loading compared to the companion material made of fly ash and LDPE and exhibited an overall response similar to that of traditional aggregates of expanded clay. Moreover, the analysis of the time-dependent compressive behavior of the two synthetic lightweight aggregates showed that the creep rate depends on applied stress in the range of 50 kPa to 400 kPa with values of creep coefficients C αε slightly higher than those of compacted sand, but comparable, or even lower, than those of other recycled materials. Shear strength parameters, including peak friction angle (ϕ′) and cohesion intercept (c′), determined by isotropically consolidated drained triaxial compression tests, were very satisfactory for both aggregates. The ϕ′ is within the range of 42.3 to 46.3°, and c′ is in the range of 1.3 to 8.6 kPa, with the highest values concerning the fly ash-HDPE aggregate. Constant head permeability tests provided values of the hydraulic conductivity (k)in the range 3÷4·10−4 m/s evidencing favourable permeability properties of both investigated synthetic aggregates. Leaching tests and thermal stability analyses proved the sustainability of both aggregates from an environmental point of view. Finally, the results obtained in the present study demonstrate the suitability of the investigated lightweight synthetic aggregates for valuable use in many geotechnical applications.

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Influence of Fly Ash Properties on Characteristics of Manufactured Angular Fly Ash Aggregates

Cited by 2 publications

References 24 publications

Artificial Lightweight Aggregates Made from Pozzolanic Material: A Review on the Method, Physical and Mechanical Properties, Thermal and Microstructure

Artificial Lightweight Aggregates Made from Pozzolanic Material: A Review on the Method, Physical and Mechanical Properties, Thermal and Microstructure

Environmental and geotechnical properties of lightweight aggregates made of reused solid wastes

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