Influence of Multicomponent and Pozzolanic Cements Containing Calcareous Fly Ash and Other Mineral Admixtures on Properties of Fresh Cement Mixtures

Gołaszewski, Jacek; Kostrzanowska–Siedlarz, Aleksandra; Ponikiewski, Tomasz; Miera, Patrycja

doi:10.1088/1757-899x/471/11/112024

Cited by 2 publications

(5 citation statements)

References 6 publications

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“…P2 significantly reduces plastic viscosity h. The addition of plasticizers makes the changes in the plastic viscosity h of the CFA mortars less significant over time. The results obtained are consistent with the results of the tests on cements containing CFA in [16,17].…”

Section: Resultssupporting

confidence: 90%

“…Even then, the water demands remain higher than those of cement [2,6]. The high water demands of CFA make it difficult to obtain fresh concrete with the required stable workability in the long term, whether it is used as an additive to cement or as an additive to concrete [6,[12][13][14][15][16][17][18]. The processing of CFA solves this problem to some extent, but it should be noted that the use of ground CFA undoubtedly has a beneficial effect on the rheological properties of mortars and their variability [12,14,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…However, the experimental data on this topic has been limited. In general, to obtain a specific workability of fresh concrete with CFA, it is necessary to use more P or SP than for of the corresponding compositions without CFA [16][17][18][19][20][21][22]. This is likely due primarily to the higher water demand of fresh concrete with CFA.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, there is a smaller amount of free water in the mixture [23]. The potentially lower efficiency of P and SP in the presence of CFA is indicated by the faster loss of workability of mixes with CFA [6], but such effects do not occur in every case [16,17,22]. To date, there has been no in-depth study on how different types of P and SP work with CFA with different properties, both in terms of the primary effect-the rheological properties of the mortars-and the secondary effects-setting time, air entrainment, or hydration heat.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Calcareous Fly Ash on the Effectiveness of Plasticizers and Superplasticizers

Gołaszewski

Ponikiewski

Kostrzanowska–Siedlarz

et al. 2020

Materials

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Due to the rational shaping of the environment and the management of environmental resources in accordance with the principle of sustainable development, calcareous fly ash (CFA)—high-calcium as a by-product of lignite combustion—is a valuable addition to concrete. This additive, however, due to its high-water demand lowers the workability of the concrete mix, which is a problem, especially in the first 90 min after mixing the components of the mix. In order to meet this challenge, plasticizers (P) and superplasticizers (SP) for concrete are used with various effects which are designed to reduce the yield value and plastic viscosity. To check the technical efficiency of admixtures P and SP with different chemical bases, the main objective of this research was to investigate the influence of raw and ground CFA on the rheological properties and other side effects of admixtures, such as the amount of air in the mixture and the amount of heat of hydration. The use of P, particularly SP, effectively improves the workability of the mortar containing CFA, especially ground CFA. With these admixtures, it is possible to obtain mortars containing ground CFA with similar rheological properties to mortars without its addition. To obtain a specific workability of mortar with CFA, it is usually necessary to introduce a higher dose of P or SP than used for mortars without CFA. The presence of raw CFA does not alter the effectiveness of P and strongly reduces the effectiveness of SP. The reduced effectiveness of SP manifests primarily as a high workability lost. The presence of ground CFA does not change the effectiveness of P (or is higher). The effectiveness of the superplasticizer SNF (with a chemical base of naphthalene sulfonate) and PE (with a chemical base of polycarboxylate ether) is slightly lower or does not change. The effectiveness of the superplasticizer SMF (with a chemical base of melamine sulfonates) is significantly lower. We found that the presence of ash affects the efficiency of P and SP, while processing via the grinding of ash makes the effect negligible. These results are novel in both their cognitive and practical aspects.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influence of Calcareous Fly Ash on the Effectiveness of Plasticizers and Superplasticizers

Gołaszewski

Ponikiewski

Kostrzanowska–Siedlarz

et al. 2020

Materials

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“…Keeping the above facts in mind, the research team focused on using slag and fly ash for the substitution of ordinary sand. Both of the waste materials are commonly available in industrialized countries and are partially used for cement production [23] and for the creation of ordinary concrete [24,25].…”

Section: Introductionmentioning

confidence: 99%

Strength and Durability Characteristics of Cement-lime Mortars with Fly Ash and Slag as Aggregate Substitutes

Katzer

Kończalski

2021

Period. Polytech. Civil Eng.

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The global consumption of sand by the concrete industry has increased significantly over the years. Natural sand has become a desired commodity in numerous regions of the world. To protect both the existing resources of natural sand and utilize waste materials, drastic actions are urgently needed. The production of cement mortars, which are solely based on fine aggregate, is responsible for the large consumption of natural sand. In the described research program, we proposed to substitute 50 % of the natural sand in mortars with fly ash and slag. The strength properties and durability characteristics of the new mortars were tested. It was proved that mortars with fly ash and slag can be used for specific applications in civil engineering. Areas for future research associated with the mortars in question were also pointed out.

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Influence of Multicomponent and Pozzolanic Cements Containing Calcareous Fly Ash and Other Mineral Admixtures on Properties of Fresh Cement Mixtures

Cited by 2 publications

References 6 publications

The Influence of Calcareous Fly Ash on the Effectiveness of Plasticizers and Superplasticizers

The Influence of Calcareous Fly Ash on the Effectiveness of Plasticizers and Superplasticizers

Strength and Durability Characteristics of Cement-lime Mortars with Fly Ash and Slag as Aggregate Substitutes

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