Influence of Cements Containing Calcareous Fly Ash on Rheological Properties of Fresh Mortars and Its Variability

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

doi:10.1007/978-3-030-22566-7_11

Cited by 5 publications

(9 citation statements)

References 11 publications

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“…That CFA meets the requirements of the standard EN 197-1 [2] on main constituents of common cement, and after the grinding process it can be also used as an active mineral additive to concrete [1,3,4,5]. As demonstrated in systematic and very extensive studies [5,6,7,8,9,10,11], the use of calcareous fly ash of up to 30% of cement, both as an additive to cement and as an additive to concrete, generally does not adversely affect the strength or durability properties of concrete. It has also been declared that CFA subjected to the grinding process can even have a beneficial effect on the selected properties of concrete, such as permeability, resistance for chloride corrosion or expansion caused by alkali-silica reaction ASR.…”

Section: Introductionmentioning

confidence: 81%

“…In the case of CFA B1 and B2 (taken from the electrostatic precipitators), the objective, after grinding, was to obtain CFA with the fineness of 5% ± 2%, and in the case of CFA T (taken from the retention tank) the fineness of 20% ± 3%. In the latter case, the target fineness was inspired by the results presented in References [4,11], indicating an insignificant effect of grinding degree of CFA to a fineness below 20% on CFA activity and mortars rheology, and at the same time aiming to reduce the costs of CFA processing. The raw CFA used in the study considerably increased water demand in the range from 116% to 126% for CFA B2 and from 106% to 114% for CFA B1 and CFA T. The processing resulted in the drop of CFA water demand; after grinding it was not higher than 106%, and the highest water demand was for CFA B2.…”

Section: Methodsmentioning

confidence: 99%

“…Yet, even then it remains higher than the water demand of cement [1,5]. High water demand of CFA makes it difficult to obtain fresh concrete with the required and stable workability in the long term [5,11,12,13,14,15,16,17,18]. This problem can be largely resolved by using effective plasticizers and superplasticizers [5,19,20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Variability of Calcareous Fly Ash Properties on Rheological Properties of Fresh Mortar with Its Addition

Nowoświat

Gołaszewski

2019

Materials

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One of the main by-products of brown coal burning is calcareous fly ash (CFA). Apart from other applications, it is used as a main component of cement, or as an active mineral additive to concrete. The present study involves the impact of the raw and processed calcareous fly ash (CFA) on the changes of rheological properties of mortars. The said impact was determined by using the coefficient of variation (CV) given in percentage. CFA samples collected from various sources were subjected to testing. The samples were collected from two electrofilters of blocks with boilers of different combustion parameters and from the retention tanks of the CFA sales department (CFA T) in which CFAs from various boilers are mixed. It has been demonstrated that the degree of the impact of CFA addition on the rheological properties of mortars depends on the source of this addition and on bulk density. The present work demonstrates the negative impact of raw CFA on mortar workability, and hence it is questionable to support its use in concrete technology.

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Section: Introductionmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

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Influence of the Variability of Calcareous Fly Ash Properties on Rheological Properties of Fresh Mortar with Its Addition

Nowoświat

Gołaszewski

2019

Materials

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“…Negative influence of fly ash (W) on workability of fresh concrete is the problem which considerably reduces the attractiveness of fly ash (W) use in concrete technology [15]. It was shown in [7,8,13,[15][16][17][18] that negative influence of fly ash (W) on the workability may be reduced by processing it by grinding, blending or separation. Favored solution is the production of cement with fly ash (W) as a main constituent -grinding is a routine technological process in cement production [7,8].…”

Section: 7mentioning

confidence: 99%

Technological aspects of usage of calcareous fly ash as a main constituent of cements

Gołaszewski¹,

Ponikiewski²,

Kostrzanowska–Siedlarz³

et al. 2021

Period. Polytech. Civil Eng.

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The use of mineral additives allows you to modify the properties of concrete and result in substantial economic benefits. The research the influence cement type with calcareous fly ash (W) content in cement, method of cement production, activation by grinding calcium fly ash and batch of fly ash on the rheology, plastic shrinkage, air content, the setting time and heat of hydration of mortar are presented in this paper. The results show that cements produced by intergrinding of the constituents or blending with fly ash pre-processed by milling, are characterized by acceptable technological properties, not differing significantly from other currently used cements. It is not recommended to use cements obtained by blending with raw calcareous fly ash W. Calcareous fly ash used for the production of cement should be selected because of its properties. According to conducted tests, this criterion can be the volume density of the ash, which should be at least 900 kg/m3. The negative effect of calcareous fly ash used as an additive for cement on workability is considerably smaller than when it is used as an additive type II.

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“…Так применение золы позволяет получать, например, жаропрочные или гидротехнические (в некоторых случаях количество золы достигает 50 %) бетоны [11][12][13]. При этом, золы в составе цементного вяжущего могут проявлять пластифицирующую и водоудерживающую способность [14][15][16]. Установлено, что прочность бетонов с применением зол напрямую зависит от ее площади удельной поверхности [17][18].…”

Section: прогнозирование прочности портландцемента в присутствии топлunclassified

Forecasting Strength of Portland Cement in the Presence of Fuel Ashes

Markov

Bezrodnykh

Markova

et al. 2020

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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Reducing the consumption of the most widespread and expensive in construction inorganic binder of hydration hardening type - Portland cement - is one of the most important tasks for the construction industry. With the current trend of resource- and energy-saving, as well as a decrease in environmental pressure, it is of great interest to use wastes from fuel and energy enterprises in the form of various types of ash (acidic, basic), which are finely dispersed raw materials of mainly aluminosilicate composition that have accumulated in large quantities on our country territories. The paper analyzes the effect of mineral additives in the form of fuel ashes, the use of which provides replacement of part of Portland cement (15-30 % of the total mass of Portland cement, in increments of 5 %), on the kinetics of hardening of the binder. Based on the results of the strength tests of binder samples with additives, calculation of predicted strength was carried out according to the methodology by Sh.M. Rakhimbayev based on transfer theory. As a result, the analysis of the kinetics of the Portland cement hardening was carried out both at early and late hardening periods; efficiency and optimal concentration of fuel ashes depending on type have been established.

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Influence of Cements Containing Calcareous Fly Ash on Rheological Properties of Fresh Mortars and Its Variability

Cited by 5 publications

References 11 publications

Influence of the Variability of Calcareous Fly Ash Properties on Rheological Properties of Fresh Mortar with Its Addition

Influence of the Variability of Calcareous Fly Ash Properties on Rheological Properties of Fresh Mortar with Its Addition

Technological aspects of usage of calcareous fly ash as a main constituent of cements

Forecasting Strength of Portland Cement in the Presence of Fuel Ashes

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