A compositional index of the pozzolanic potential of pulverized-fuel ash

Hubbard, F. H.; Dhir, Ravindra K.

doi:10.1007/bf00720328

Cited by 8 publications

(8 citation statements)

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“…Aiming to recognize fly ashes tested, the following characteristics were determined: (1) the chemical composition using the energy dispersive X-ray fluorescence (XRF) method; (2) the mineral composition using X-ray phase analysis (XRD); (3) the grain size distribution using a laser diffraction; (4) the morphology and chemical composition using scanning electron microscope technique; and (5) the pozzolanic activity according to the standards [ 13 , 67 ] and requirements contained in related literature [ 68 ]. Detailed information on the conditions for conducting the above-mentioned tests, as well as the equipment used, have been presented in previous publications [ 29 , 32 ].…”

Section: Methodsmentioning

confidence: 99%

Temperature Influence on Ordinary Concrete Modified with Fly Ashes from Thermally Conversed Municipal Sewage Sludge Strength Parameters

et al. 2020

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Concrete is the most commonly used structural material, without which modern construction could not function. It is a material with a high potential to adapt to specific operating conditions. The use of this potential is made by its material modification. The aim of the performed investigations was the assessment of rational application possibilities of fly ashes from thermally conversed municipal sewage sludge as an alternative concrete admixture. A concrete mix was designed, based on the Portland cement CEM I 42.5R and containing various quantity of ash, amounting to 0–25% of cement mass. The samples were conditioned and heated in a furnace at the temperature of 300 °C, 500 °C, and 700 °C. Physical and chemical properties of the ashes as well as utility properties of the concrete, i.e., density, compressive strength after 28, 56, and 90 days of maturation, frost resistance, and compressive strength in high temperature were determined. The tests were performed at cubic samples with 10 cm edge. The replacement of a determined cement quantity by the fly ashes enables obtaining a concrete composite having good strength parameters. The concrete modified by the fly ashes constituting 20% of the cement mass achieved its average compressive strength after 28 days of maturation equal to 50.12 MPa, after 56 days 50.61 MPa and after 90 days 50.80 MPa. The temperature growth weakens the composite structure. The obtained results confirm the possibility of waste recycling in the form of fly ashes as a cement substitute in concrete manufacturing.

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Section: Methodsmentioning

confidence: 99%

Temperature Influence on Ordinary Concrete Modified with Fly Ashes from Thermally Conversed Municipal Sewage Sludge Strength Parameters

et al. 2020

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“…The pozzolanic activity of fly ash was carried out according to PN-EN 450-1: 2012 [46] and the ASTM C379-65TP [47] method as well as guidelines from the literature [48].…”

Section: Test Methods For Fly Ashmentioning

confidence: 99%

“…Additionally, the SEM images of FAMSS were presented in Figure 3. The pozzolanic activity of fly ash according to ASTM C379-65T [48] is determined on the basis of the SiO 2 and Al 2 O 3 content. According to the literature, the total content of SiO 2 and Al 2 O 3 above 20% indicates the pozzolanic character of the tested samples [59].…”

Section: Properties Of Fly Ash and Concrete MIXmentioning

confidence: 99%

“…Potassium oxide plays a major role in this case. According to the literature [48], potassium and aluminum oxide, and thus the K 2 O/Al 2 O 3 ratio, determine the activity of fly ashes. The content of K 2 O and Al 2 O 3 in siliceous fly ash tested by Rutkowska et al [61] was 0.2% and 27.8%, and in FAMSS it was 1.40% and 18.98% (Figure 1), respectively.…”

Section: Properties Of Fly Ash and Concrete MIXmentioning

confidence: 99%

“…However, according to Yusuf and Noor [62], the pozzolanic properties and chemical composition (silica, iron, calcium, aluminum) of fly ashes from the combustion of sewage sludge are analogous to the mineral additives that are commonly used. Hubbard and Dhir [48] introduced the pozzolanic potential desirable (K 2 O/Al 2 O 3 ·10), which, depending on the proportion of oxides, subdivides fly ashes into three classes. An index of 0.73 was obtained for the FAMSS tested, which classifies the material into medium reactive class (the second class of reactivity).…”

Section: Properties Of Fly Ash and Concrete MIXmentioning

confidence: 99%

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Modification of Ordinary Concrete Using Fly Ash from Combustion of Municipal Sewage Sludge

et al. 2020

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This article focuses on the impact of fly ash from the combustion of municipal sewage sludge (FAMSS) as a cement additive in the amounts of 5%, 10%, 15%, 20% and 25% (by mass) on selected concrete properties. In the course of the experimental work, water penetration depth and compressive strength measurements were made at various periods of curing (from 2 to 365 days). In addition, the potential impact of FAMSS on the natural environment was examined by determining the leachability of heavy metals. FAMSS-modified concretes showed small values of water penetration depth (lower than 50 mm), as well as good compressive strength (reaching minimum class C30/37 after 130 days of maturing)—similar to the compressive strength obtained for conventional concrete. In addition, the partial replacement of cement with FAMSS has environmental benefits, expressed as a reduction in CO2 emissions. In addition, study has shown that compliance with environmental requirements is associated with heavy metal leaching.

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Mineral Additions for Cement Production

Kurdowski

2014

Cement and Concrete Chemistry

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A compositional index of the pozzolanic potential of pulverized-fuel ash

Cited by 8 publications

References 1 publication

Temperature Influence on Ordinary Concrete Modified with Fly Ashes from Thermally Conversed Municipal Sewage Sludge Strength Parameters

Temperature Influence on Ordinary Concrete Modified with Fly Ashes from Thermally Conversed Municipal Sewage Sludge Strength Parameters

Modification of Ordinary Concrete Using Fly Ash from Combustion of Municipal Sewage Sludge

Mineral Additions for Cement Production

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