The influence of physico-chemical properties of fly ash and CKD on strength generation of high-volume fly ash concrete

Sadique, Monower; Coakley, Eoin

doi:10.1680/jadcr.15.00103

Cited by 18 publications

(6 citation statements)

References 21 publications

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“…The BM3 sample achieved the highest value of compressive strength, where the main binder constituents in the mixture (clinker, limestone, and GGBS) were at the minimum level of the recommended range for the DoroCem product. High compressive strength values (60–69 MPa) of quaternary mixes consisting of 30 wt.% Portland cement, 45–50 wt.% fly ash, 5–10 wt.% BPD, and 15–18.5 wt.% GGBS after 28 days of hardening were achieved [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Števulová

Strigac²,

Junak

et al. 2020

Materials

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This article describes utilization of a cement kiln bypass dust utilization as an added component in a hydraulic road binder. Three experimental binder mixes (BM1–BM3) with variation in the composition of the main constituents (cement clinker, ground limestone and ground granulated blast furnace slag) and constant content of bypass dust (10%) were prepared under laboratory conditions. The properties of binder constituents, fresh experimental binder mixes and hardened specimens were tested according to STN EN 13282-2 for a normal hardening hydraulic road binder. The physical and chemical properties of all binder mixes (fineness: +90 µm ≤ 15 wt.%; SO3 content: <4 wt.%) met the standard requirements. The bypass dust addition led to an increase in the water content for standard consistency of cement mixes (w/c = 0.23) and to a shortening of the initial setting time for two experimental blended cement pastes (BM1 and BM3) compared with the value required by the standard. Only BM2 with the lowest SO3 content (0.363 wt.%) and the highest percentage of granulated blast furnace slag (9.5 wt.%) and alkalis (Na2O and K2O content of 5.9 wt.%) in the binder mix met the standard value for the initial setting time (≥150 min). The results of compressive strength testing of experimental specimens after 56 days of hardening (59.2–63.9 MPa) indicate higher values than the upper limit of the standard requirement for the N4 class (≥32.5; ≤52.5 MPa).

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Section: Resultsmentioning

confidence: 99%

Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Števulová

Strigac²,

Junak

et al. 2020

Materials

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“…Better results were achieved when CKD was used in the concretes with pozzolanic additives, slag cement or special sulfate-resistant cement. Many authors [36,37] have observed enhanced flexural splitting, splitting tensile and compressive strengths with the simultaneous use of an optimal amount of CKD (up to 10%) as well as fly ash and granulated blast furnace slag and as additives. The important role of CKD in activating the properties of pozzolanic additives during cement hydration as well as the increase in ettringite volume was found.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Hydrophobization on the Durability of Concrete with Cement Kiln Dust

Grzegorczyk-Frańczak,

Andrzejuk,

Hunek

et al. 2024

Adv. Sci. Technol. Res. J.

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The examinations of concrete involved partial substitution of cement with cement kiln dust (CKD) 0, 5, 10, 20 and 30%. The water/cement (w/c) ratio amounted to 0.36. The obtained findings pertaining to open porosity, density, and volumetric density were found to correlate with the capillary action and absorptivity of the analyzed types of concrete. With the maximum addition of CKD, i.e. 30%, open porosity decreased by 35%. In turn, CKD added in the amount of 5% resulted in a slightly reduced addition compressive strength, amounting to 1.3% and 2.1% following 28 days and 56 days of concrete curing, respectively. After 28 days, the differences in strength were greater when the additive was supplied in higher amounts, i.e. 10%, 20%, and 30%, resulting in 6.5%, 13.4%, and 22.9% decrease, respectively, in spite of strength improvement. In terms of flexural and splitting tensile strengths, comparable relations were noted. As far as the frost resistance test results are concerned, the mass losses in all examined concretes were not significant, reaching up to 0.5%. The strength reduction in the case of the first three series of concretes was below 3%. When the CKD addition was increased to 20% and 30%, the value of the dynamic modulus of elasticity E c,s decreased to a greater degree, by 8.0% and 14.7%, respectively. The hydrophobization effect is best seen in CKD-free concrete. After the impregnation, the loss of mass following the frost test of the samples is reduced by half. With a higher CKD content, the hydrophobization effectiveness is insignificant. The most favourable results were observed for hydrophobization with the oligomer-based preparation A1.

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“…Due to its high alkalinity and significant metal content, CCR seriously harms the environment 31 . The high alkalinity of CCR makes it appropriate for activating GGBFS, thereby enhancing its reactivity during the early stages 32 , 33 .…”

Section: Introductionmentioning

confidence: 99%

Innovative geopolymer-based cold asphalt emulsion mixture as eco-friendly material

Dulaimi,

Al Busaltan,

Mydin

et al. 2023

Sci Rep

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In recent years, there has been a growing interest in cold asphalt emulsion mixture (CAEM) due to its numerous advantages, including reduced CO2 emissions, energy savings, and improved safety during construction and application. However, CAEM has often been considered inferior to hot mix asphalt (HMA) in terms of performance. To address this issue and achieve desirable performance characteristics, researchers have been exploring the modification of CAEM using high-cost additives like ordinary Portland cement. In this study, the focus was on investigating the effects of utilizing waste alkaline Ca(OH)2 solution, ground granulated blast-furnace slag (GGBFS), and calcium carbide residue (CCR) as modifiers to enhance the properties of CAEM. The aim was to develop an innovative geopolymer geopolymer-based cold asphalt emulsion mixture (GCAE). The results of the study revealed that the use of waste alkaline Ca(OH)2 solution led to an increase in early hydration, which was confirmed through scanning electron microscopy. Furthermore, the experimental findings demonstrated that waste alkaline Ca(OH)2 solution significantly contributed to the rapid development of early-age strength in GCAE. As a result, GCAE showed great potential for utilization in pavement applications, particularly for roads subjected to harsh service conditions involving moisture and temperature. By exploring these alternative modifiers, the study highlights a promising avenue for enhancing the performance of CAEM and potentially reducing the reliance on expensive additives like ordinary Portland cement. The development of GCAE has the potential to offer improved performance and durability in pavement applications, thus contributing to sustainable and efficient road infrastructure.

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The influence of physico-chemical properties of fly ash and CKD on strength generation of high-volume fly ash concrete

Cited by 18 publications

References 21 publications

Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Effect of Surface Hydrophobization on the Durability of Concrete with Cement Kiln Dust

Innovative geopolymer-based cold asphalt emulsion mixture as eco-friendly material

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