Use of fly-ash for the production of hydraulic binding agents and for soil stabilisation / Zastosowanie Popiołów Lotnych Do Produkcji Spoiw Hydraulicznych I Wzmacniania Gruntu

Kołodziejczyk, U.; Ćwiąkała, Michał; Widuch, Aleksander

doi:10.2478/v10269-012-0036-9

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…In the past, the disposal of power plant fly ash produced from coal combustion was a major challenge for environmentalists and scientists. This problem has been addressed in numerous studies [1][2][3][4]. Recently, much attention has been paid to the utilization of mineral fines generated during the production of aggregates and the mixing of asphalt materials.…”

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confidence: 99%

The use of gabbro dust in the cold recycling of asphalt paving mixes with foamed bitumen

Iwański

Buczyński

Mazurek

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Mineral fines are a waste product of aggregate production in quarries and asphalt mixing plants. The incorporation of mineral gabbro dust into foam bitumen causes developing of a mesh reinforcement in the recycled base mixture. This mesh reinforcement, observed in a recycled base structure, induces an increase in stiffness modulus, where its elastic part of complex modulus dominates over the imaginary part. Therefore, it is possible to create a recycled mixture with a lower susceptibility to loading time/temperature. In result, the presence of gabbro dust in recycled mixture limits the magnitude of strains induced by the traffic load. This paper presents the results of the tests carried out on the mineral dusts derived from gabbro rock. Structural and functional properties of the fines were determined to prepare their characteristics. Then, the cold recycled mixtures for the road base were designed with the 5-20% mineral fines content. The mixtures were prepared in cold recycling technology with foamed bitumen. Further tests involved determining mechanical and physical properties of the recycled mixes, including air voids content, Marshall stability, Marshall quotient (stiffness), indirect tensile strength and stiffness modulus at 20°C). The results indicated a positive influence of the gabbro dusts on the investigated parameters. With the use of ANOVA tests, the significance of the influence of the gabbro dust and foamed bitumen on these properties was evaluated. Harrington's multicriteria method was employed to establish gabbro dust and foamed bitumen amounts, the addition of which would guarantee optimal properties of the recycled base mixture.

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Section: Introductionmentioning

confidence: 99%

The use of gabbro dust in the cold recycling of asphalt paving mixes with foamed bitumen

Iwański

Buczyński

Mazurek

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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The Possibility to Use Modified Flight Ash as a Neutralizer in the Acid Soils Reclamation Processes

Ćwiąkała

Greinert

Kostecki

et al. 2018

Civil and Environmental Engineering Reports

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Using the alkaline fly ash after combustion of lignite as the acid soils neutralizer is a technique known for decades. Due to many disadvantages of the direct fly ash application it is sought to modify this material prior to its use. The process of fly ash modification in the magnetic activator involved breaking up fly ash to small grain sizes in order to obtain a material with a very large specific surface and modified properties. The purpose of the research was to compare the properties of unmodified fly ash with those of ash modified in the magnetic activator in terms of its usefulness in the neutralization of acidic soils. Unmodified fly ash was classified as a medium-grained calciferous material. The basic components of ash were silicates (33.28% of SiO2) and calcium compounds (31.26% of CaO). It has a low heavy metal content falling within a range characteristic of coal ash and meeting soil quality standard requirements. As a result of activation, the following changes were obtained in the properties of modified ash compared with unmodified ash: sand fraction content – reduced to 0.40, silt fraction content – increased by 1.40, silt fraction content – increased by 1.68, content of the sum of the dust and silt fractions – increased by 1.49, specific surface – increased by 1.65, fineness – reduced by 0.48. Modification of fly ash in the magnetic activator was found to have improved the physical properties of ash as acidic soil neutralizer, and its chemical properties make such an application possible.

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Screen-Out Stones Activated with Mineral Binders and Used as Material for Earth Construction

Hydzik-Wiśniewska,

Ostrowski,

Wilk

et al. 2023

BJRBE

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The article presents the e valuation o f h ow suitable waste from the production of aggregates in quarries could be in earthwork using the example of screen-outs from Krosno sandstone. The waste, called screen-out, is characterised by an uncontrolled content of dust and clay fractions. Screen-outs have a relatively low bearing ratio (CBR not exceeding 20%) and a tendency to heave due to frost (SE <35). To check whether the geotechnical properties can be improved, mixtures with 2%, 5%, and 8% binders, such as lime, fly ash, and two road binders with lime, fly ash, and cement were prepared. The analysis was based on the results of the CBR and compressive strength tests. The use of mineral binders caused the value of the immediate CBR to increase compared to the screen-out itself from a dozen to as much as 50%. For a binder containing 20% Portland clinker, the CBR was about 60% after 4 days of saturation, while for a binder containing up to 50% Portland clinker, it was over 200%. The value of compressive strength after 28 days of maturing ranged from about 100 kPa to 1 MPa for all mixes tested. The lowest values were obtained for screen-outs activated with fly ash, and the highest for road binder with cement content of up to 50%.

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Use of fly-ash for the production of hydraulic binding agents and for soil stabilisation / Zastosowanie Popiołów Lotnych Do Produkcji Spoiw Hydraulicznych I Wzmacniania Gruntu

Cited by 3 publications

References 1 publication

The use of gabbro dust in the cold recycling of asphalt paving mixes with foamed bitumen

The use of gabbro dust in the cold recycling of asphalt paving mixes with foamed bitumen

The Possibility to Use Modified Flight Ash as a Neutralizer in the Acid Soils Reclamation Processes

Screen-Out Stones Activated with Mineral Binders and Used as Material for Earth Construction

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