Heat of hydration of low-clinker cements

Klemczak, Barbara; Batog, Maciej

doi:10.1007/s10973-015-4782-y

Cited by 71 publications

(22 citation statements)

References 28 publications

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“…There is great interest in composites containing high amount (50% and higher) of cement replacements. For example, attempts of incorporating various additives in cement pastes, such as siliceous fly ash, metakaolin or slag, were presented in works [1][2][3]. The additives have a significant impact on lowering the heat of hydration and the rate of heat evolution of composite binders.…”

Section: Introductionmentioning

confidence: 99%

“…In case of low-calcium fly ash, lengthening of induction period and reduction of intensity of acceleration period are observed. The more of such component is added, the stronger the effects are observed [1,2,4].…”

Section: Introductionmentioning

confidence: 99%

“…Using mixture of fluidized fly ash and slag, as nonclinker binder, one makes use of self-cementing properties of fly ash and activating action of its components (especially Ca(OH) 2 and CaSO 4 ) on slag grains [1,3,17]. There is a little information in the literature about such utilization of these waste materials describing mechanism of chemical processes of hardening and properties of final composite.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of hydration products of fly ash–slag pastes

Kledyński

Machowska

Pacewska

et al. 2017

J Therm Anal Calorim

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The paper presents the results of the research identifying the hydration products present in hardened fly ash-slag pastes considered as alternative non-clinker binder. Thermal analysis (TG/DTG), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used as complementary methods. The pastes contained the binder made of two components: fly ash from circular fluidized bed combustion of brown coal and ground granulated blast furnace slag. The components were mixed accordingly to five formulas differing in proportions, but with constant water/binder ratio (w/b = 0.5). No chemical activators were used to initiate the binding reaction of blast furnace slag. The results of thermal analysis, IR spectroscopy and scanning electron microscopy as well as the increase of compressive and flexural strength in time revealed the progression of hydration process in time and formation of products similar to ones present in hardened cement pastes. SEM observations of pastes after 90 days of curing showed fibrous (type I) and similar to honeycomb form of C-S-H phase, ettringite and calcium aluminates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of hydration products of fly ash–slag pastes

Kledyński

Machowska

Pacewska

et al. 2017

J Therm Anal Calorim

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“…Lawrence, et al have shown that limestone in cement increases early age mechanical strength because of its reactions with the C 3 A and C 4 AF phases (formation of aluminates and carboaluminates) but later its impact becomes marginal [37,38]. As a result of their low early age reactivity [29,30,39] and 6 the increase in the length of the dormant period [40,41], slag and fly ash produce low hydration heat with time. The compressive strength is lower at early age but similar to or higher than compressive strength after 28 days for concretes without slag and fly ash considering an equal binder content [30,42].…”

Section: Current State Of Knowledgementioning

confidence: 99%

Optimization of concrete mix design to account for strength and hydration heat in massive concrete structures

Bourchy¹,

Barnes²,

Bessette³

et al. 2019

Cement and Concrete Composites

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In the case of massive concrete structures, the heat generated by cement hydration may cause cracking due to thermal strains. The mix design of the concrete used for such structures has to take account of mechanical properties and generated temperatures. Using experimental design principles, the hydration heat and the development of compressive strength are measured in order to determine how the composition of concrete and the presence of SCM influence the characteristics of concrete and to create a mix design protocol. This protocol can help to determine which mix design minimizes the hydration temperature for a given compressive strength.

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“…Modelling of transport processes and hydration phenomena in early age concrete is a challenging engineering problem, since hydration of cement is an exothermic reaction, which may result in high temperatures and related deformations, stresses, and cracking in concrete structures, e.g. [1][2][3][4][5][6][7] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Homogenization of Transport Processes and Hydration Phenomena in Fresh Concrete

Beneš

Štefan

2020

Acta Polytech

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The problem of hydration and transport processes in fresh concrete is strongly coupled and non- inear, and therefore, very diﬃcult for a numerical modelling. Physically accurate results can be obtained using ﬁne-scale simulations, which are, however, extremely time consuming. Therefore, there is an interest in developing new physically accurate and computationally eﬀective models. In this paper, a new fully coupled two-scale (meso-macro) homogenization framework for modelling of simultaneous heat transfer, moisture ﬂows, and hydration phenomena in fresh concrete is proposed. A modiﬁed mesoscalemodelisﬁrstintroduced. Inthismodel, concreteisassumedasacompositematerialwithtwo periodically distributed mesoscale components, cement paste and aggregates. A homogenized model is then derived by an upscaling method from the mesoscale model. The coeﬃcients for the homogenized model are obtained from the solution of a periodic cell problem. For solving the periodic cell problem, two approaches are used – a standard ﬁnite element method and a simpliﬁed closed-form approximation taken from literature. The homogenization framework is then implemented in MATLAB environment and ﬁnally employed for illustrative numerical experiments, which verify that the homogenized model provides physically accurate results comparable with the results obtained by the mesoscale model. Moreover, it is veriﬁed that, using the homogenization framework with a closed-form approach to the periodic cell problem, signiﬁcant computational cost savings can be achieved.

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Heat of hydration of low-clinker cements

Cited by 71 publications

References 28 publications

Investigation of hydration products of fly ash–slag pastes

Investigation of hydration products of fly ash–slag pastes

Optimization of concrete mix design to account for strength and hydration heat in massive concrete structures

Homogenization of Transport Processes and Hydration Phenomena in Fresh Concrete

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