Fly Ash as a Cementitious Material for Concrete

Li, Long-yuan; Razak, Rafiza Abd; Ahmad, Romisuhani; Abdullah, Mohd Mustafa Al Bakri; Yahya, Zarina; Bouaissi, Aissa

doi:10.5772/intechopen.90466

Cited by 13 publications

(6 citation statements)

References 35 publications

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“…These results fall into accordance with the results found in the literature and infer the fact that, depending on the type of application, the appropriate concentration of waste aggregate can provide significant advantages in comparison to regular concrete. For example, through adding a low concentration of waste materials, the mechanical properties of the newly formed concrete are similar to those of the regular concrete, being good for the structural elements of buildings or, through adding an increased quantity of waste materials, the mixture provides a lower material conductivity, helping insulate the building and preventing heat loss [ 22 , 23 , 24 , 25 , 27 , 28 , 29 ].…”

Section: Characterization Of Concrete Thermal Propertiesmentioning

confidence: 99%

Experimental Investigation on Mechanical and Thermal Properties of Concrete Using Waste Materials as an Aggregate Substitution

et al. 2022

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The continuous growth of the concrete industry requires an increased quantity of cement and natural aggregates year after year, and it is responsible for a major part of the global CO2 emissions. These aspects led to rigorous research for suitable raw materials. Taking into account that these raw materials must have a sustainable character and also a low impact on environmental pollution, the replacement of the conventional components of concrete by residual waste can lead to these targets. This paper’s aim is to analyze the density, compressive strength and the thermal conductivity of nine concrete compositions with various rates of waste: four mixes with 10%, 20%, 40% and 60% chopped PET bottles aggregates and 10% fly ash as cement partial substitution; a mix with 60% waste polystyrene of 4–8 mm and 10% fly ash; a mix with 20% waste polystyrene of 4–8 mm, 10% waste polystyrene of 0–4 mm and 10% fly ash; a mix with 50% waste polystyrene of 4–8 mm, 20% waste polystyrene of 0–4 mm and 20% fly ash two mixes with 10% fly ash and 10% and 40% waste sawdust, respectively. Using 60% PET aggregates, 60% polystyrene granules of 4–8 mm, or 20% polystyrene of 0–4 mm together with 50% polystyrene of 4–8 mm led to the obtainment of lightweight concrete, with a density lower than 2000 kg/m3. These mixes also registered the best results from a thermal conductivity point of view, after the concrete mix with 40% saw dust. Regarding compressive strength, the mix with 10% PET obtained a result very close to the reference mix, while those with 20% PET, 40% PET, 30% polystyrene, and 10% saw dust, respectively, registered values between 22 MPa and 25 MPa, values appropriate for structural uses.

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Section: Characterization Of Concrete Thermal Propertiesmentioning

confidence: 99%

Experimental Investigation on Mechanical and Thermal Properties of Concrete Using Waste Materials as an Aggregate Substitution

et al. 2022

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“…However, the density reduced upon replacing proportions of cement with fly ash. This is as a result of the lower specific gravity of fly ash in comparison to cement . The reduction in density was proportional to the increasing fly ash content.…”

Section: Results and Discussionmentioning

confidence: 94%

“…This is as a result of the lower specific gravity of fly ash in comparison to cement. 31 The reduction in density was proportional to the increasing fly ash content. There were 7.8 and 11.52% reduction in densities for 25 and 50% fly ash replacement, respectively.…”

Section: Resultsmentioning

confidence: 95%

New Lightweight Cement Formulation for Shallow Oil and Gas Wells

2020

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The use of lightweight pozzolanic aggregates as partial replacement of cement results in low-density cement systems. Such systems ensure effective zonal isolation in zones where low equivalent circulating densities are required. However, low pozzolanic materials, such as fly ash and ground granulated blast furnace slag (GGBFS), have poor early-age strength development and long set times, especially when used in high volume, that is, exceeding 50% by weight of cement. The objective of this study is to develop a lightweight oil- and gas-well cement recipe with enhanced properties employing the synergism that exist among fly ash, GGBFS, and silica fume. The experimental work was per laboratory procedure outlined by American Petroleum Institute. Portland class G cement and the aluminosilicate materials were admixed in water to form a 13.5 ppg slurry. Chemical admixtures were used to facilitate the dissolution of reactive components in the pozzolanic materials and the hydration process. The experimental investigations were done at 150 °F and an ambient pressure of 1500 psi. The newly developed lightweight recipe exhibited excellent rheological and mechanical properties, having a wait-on-cement time for about 4 h and a 24 h sonic strength of 3116 psi, at 150 °F and 1500 psi. The thickening time was approximately 4 h (70 Bc). This slurry will be ideal in zones that would require a low hydrostatic slurry column and rapid gel strength development.

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“…Due to these properties fly ash gives great mechanical strength and a good fire and chemical resistance, which influenced the researchers to find a different application of fly ash. Coal ash, especially, fly ash has been intensively studied in the geopolymers technology, therefore, this waste already presents a high interest for the researcher, and it will not be evaluated/presented intensively here [21].…”

Section: Coal Ashmentioning

confidence: 99%

The Physical and Mechanical Characteristics of Geopolymers Using Mine Tailings as Precursors

Vizureanu¹,

Burduhos-Nergis²,

Sandu³

et al. 2021

Advances in Geopolymer-Zeolite Composites - Synthesis and Characterization

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Mine tailings are waste materials that resulted from the extraction and processing of raw materials to form mineral products. These dusty particles present negative environmental effects after being deposited in different types of dumping areas. Based on the circular economy concepts and the presently pushing need of identifying wastes as a potential replacement for natural resources, this chapter aims to present the physical (density, microstructure) and mechanical (compressive strength, flexural strength) characteristics of different types of geopolymers which use mine tailings as precursors or blended systems (mixes of different raw materials). The main reasons of approaching this topic are the need to decrease the consumption of natural resources, reduce environmental pollution and create an economic system aimed to capitalize the mining wastes. Accordingly, this chapter includes information regarding the availability of this waste and its potential utilization as a raw material in civil engineering applications. Therefore, reports of specific agencies and multiple research studies which approach tailing based geopolymers or blended systems have been summarized.

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Fly Ash as a Cementitious Material for Concrete

Cited by 13 publications

References 35 publications

Experimental Investigation on Mechanical and Thermal Properties of Concrete Using Waste Materials as an Aggregate Substitution

Experimental Investigation on Mechanical and Thermal Properties of Concrete Using Waste Materials as an Aggregate Substitution

New Lightweight Cement Formulation for Shallow Oil and Gas Wells

The Physical and Mechanical Characteristics of Geopolymers Using Mine Tailings as Precursors

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