Hydration of cement by-pass dust

Czapik, Przemysław; Zapała-Sławeta, Justyna; Owsiak, Z.; Stępień, Piotr

doi:10.1016/j.conbuildmat.2019.117139

Cited by 49 publications

(27 citation statements)

References 21 publications

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“…To counteract this effect and make the mixture more flexible, an appropriate amount of bituminous binder is added [7]. The stiffness of the layer can also be reduced by replacing cement with supplementary cementing materials (SCMs), such as hydrated lime, and with byproducts of the cement manufacturing process, such as cement kiln dust (CKD) and cement bypass dust (CBPD) [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The use of cement with the addition of byproducts generated during cement manufacture is a relatively recent innovation and requires undertaking further studies. Dusts, such as CKD or CBPD, especially those generated at lower temperatures in modern furnace systems, may have binding properties as they contain clinker phases [8,9]. They may also contain unreacted free lime [9,13].…”

Section: Introductionmentioning

confidence: 99%

“…Dusts, such as CKD or CBPD, especially those generated at lower temperatures in modern furnace systems, may have binding properties as they contain clinker phases [8,9]. They may also contain unreacted free lime [9,13]. The presence of these dusts can thus significantly affect the properties of the binder used in the base layer.…”

Section: Introductionmentioning

confidence: 99%

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Properties of a Three-Component Mineral Road Binder for Deep-Cold Recycling Technology

2020

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This study examined the physical properties of a three-component mineral binder that is typically used in deep-cold recycling. Test binders were produced using Portland cement, hydrated lime, and cement bypass dust (CBPD) as a byproduct derived from cement production. The suitability of CBPD for use in road binders was assessed. Effects of the three-component binder composition on the setting time, soundness, consistency, and tensile and compressive strengths of the cement pastes and mortars were determined. The pastes and mortars of the same consistency obtained at different w/b ratios were tested. On this basis, the mixture proportions resulting in road binders satisfying the requirements of PN-EN 13282-2:2015 were determined. By mixing cement, lime, and CBPD during the tests, binder classes N1 to N3 were obtained. The replacement of 40% of cement mass with the CBPD high in free lime produced road binders suitable for recycled base layers. The total content of CBPD and hydrated lime in the road binder should not exceed 50% by mass. The potential risk of mortar strength reduction due to KCl recrystallization was discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of a Three-Component Mineral Road Binder for Deep-Cold Recycling Technology

2020

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“…The skid resistance [6] is responsible for the safety of users, and the fatigue life of pavement layers depends on the type of binders [7][8][9], additives [10] and mineral components used, that is, aggregate [11] and reclaimed asphalt pavement (RAP) [12]. Common additives in cold deep recycled mixtures with foamed bitumen and bitumen emulsion include: cement, lime, ash (waste from cement production) [13] and hydraulic binders, which generally increase cohesion, hence, durability, and in some cases improve the resistance to weather (moisture, interaction of moisture and frost). The composition of a cold-recycled mixture may cause many problems.…”

Section: Introductionmentioning

confidence: 99%

The Influence of a Polymer Powder on the Properties of a Cold-Recycled Mixture with Foamed Bitumen

Buczyński

Iwański

2019

Materials

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The paper investigates the influence of redispersible polymer powder (RPP) on the physical and mechanical properties of a cold-recycled mixture with foamed bitumen (CRM-FB). Four types of RPP with a varied chemical base were used: VA-VeoVA, VA-VeoVa-Ac, EVA and VA/VV/E/Ac. The polymer powder-modified cold recycled mixture with foamed bitumen, (P)CRM-FB, was composed of 45.8% reclaimed asphalt pavement (RAP), 45.8% natural aggregate (VA), 3.0% Portland cement CEM I 42,5R, 3.0% foamed bitumen 50/70 and 3.0% RPP, all dosed by weight. The reference mixture, (R)CRM-FB, served as a reference point for comparison. It was found that RPP improved the workability of the CRM-FB mixture. This results in a reduced number of compaction cycles and lower energy needed to obtain the air void content as in the reference mixture. In addition, the RPP modifier markedly increased the CRM-FB mixture cohesion (ITSDRY) and strength, by approximately 40–70%, depending on the RPP used. These findings are particularly important for CRM-FB mixtures designed for road bases. The present investigations confirmed the improvement of the CRM-FB mixture parameters after the modification with RPP, regardless of the powder type used.

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“…4a, c), the presence of which was suggested by a high background exhibited on the XRD pattern. The X-ray microanalysis reveals a significant silicon content typical for the alkaline silica gel formed as a result of the alkali-silica reaction with sodium and potassium [14,15,16,17]. The presence of chlorine and even single crystals of sodium chloride are also detected (Fig.…”

Section: Microstructurementioning

confidence: 99%

Chemical corrosion of external stairs – case study

Czapik

Owsiak

2018

MATEC Web Conf.

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On the basis of examinations of the efflorescences formed on the concrete surface, an attempt was made to analyze the sources of concrete corrosion without entering inside the construction. The concrete stairs revealed the symptoms of leaching, as a result of alkali-aggregate reactions developing beneath the surface. As a result of this corrosion process and the carbonation propagating from the concrete surface, the carbonate efflorescences were found. Their phase composition was determined by X-ray diffraction. In order to identify whether the efflorescences were the results of the alkali-silica reaction or alkalicarbonate reaction, the microstructure was investigated using the scanning electron microscope together with energy dispersive spectroscopy.

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Hydration of cement by-pass dust

Cited by 49 publications

References 21 publications

Properties of a Three-Component Mineral Road Binder for Deep-Cold Recycling Technology

Properties of a Three-Component Mineral Road Binder for Deep-Cold Recycling Technology

The Influence of a Polymer Powder on the Properties of a Cold-Recycled Mixture with Foamed Bitumen

Chemical corrosion of external stairs – case study

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