Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures

Narmluk, Mongkhon; Nawa, Toyoharu

doi:10.1016/j.cemconres.2011.02.005

Cited by 168 publications

(53 citation statements)

References 49 publications

(82 reference statements)

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“…Addition of fly ash more distinctly retards the acceleratory period of cement hydration than slag, this tendency is especially clear for the high substitution rate of fly ashes. This retarding effect of the mineral additions on the cement hydration has been already reported [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Resultsmentioning

confidence: 67%

“…For composite binders containing fly ash, the hydration heat evolution has been studied, inter alia, by Nocuń-Wczelik [25][26][27], Pacewska et al [28][29][30], Giergiczny [31,32], Han et al [22], Kumar et al [33], Narmluk et al [34] and Mounanga et al [35]. Similarly, as for slag cements, the tests showed that the evolved heat decreases with increasing amount of fly ash addition.…”

Section: Introductionmentioning

confidence: 99%

“…Kumar et al [33] reported that the addition of fly ash retards the hydration process while raising temperature accelerates it. Narmluk et al [34] found that fly ash retards the early hydration of cement but accelerates the hydration of cement in the later period at 20 and 35°C, but at 50°C and 50 % dosage of fly ash retards the hydration of cement at later age as well. Nevertheless, it is highlighted that the influence of fly ash addition on the hydration process can be different and it is dependent on the mineral composition and fineness of fly ash [25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Heat of hydration of low-clinker cements

Klemczak

Batog

2015

J Therm Anal Calorim

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The hydration heat evolution of low clinker cements is studied in a dependence on the testing method and temperature. Four substitution rates of ordinary Portland cement by ground granulated blast furnace slag or siliceous fly ash were used-10, 30, 50 and 70 %. In all cases, the water/binder ratio of the cement paste was 0.5. The heat evolution and the heat evolution rate were monitored over 72 h with the use of two testing methods. The isothermal measurements were carried out with the use of TAM Air isothermal calorimeter at 20 and 50°C. The heat evolution was also determined with the use of a semiadiabatic calorimeter. Part I of the paper presents the results of the experimental tests and discussed the influence of mineral additives on the hydration heat evolution.

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat of hydration of low-clinker cements

Klemczak

Batog

2015

J Therm Anal Calorim

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“…Ces sous produits sont de plus en plus utilisés dans certains matériaux notamment les ciments [1][2][3][4][5]. A notre connaissance, peu de travaux ont été consacrés à leur intégration dans les céramiques traditionnelles (carreaux, briques, ….).…”

Section: Charbonunclassified

Recyclage de déchets industriels, phosphogypse et cendres volantes, dans des matériaux de construction

Manal¹,

Samdi²,

Elabassi

et al. 2012

MATEC Web of Conferences

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Abstract. The ceramics industry in particular traditional building materials, is undergoing a major expansion in Morocco. An increasing demand results in the creation or expansion of several production units (cement, brick ...) throughout the country. These materials, produced in large tonnages, are likely to contain some industrial waste capable of causing environmental problems. This confinement should have no negative impact on the performance of the material nor on users' health. Our goal is the proper use of this waste (produced several million tons annually) which is being disposed by discharging it into the sea, or by its burial nearby the place of production. The purpose of this work is the recycling of two different industrial wastes: the phosphogypsum (rejection of the production of phosphoric acid) and fly ash (residue thermal from power stations) by integrating them into the formulation of clay brick products. The advantage behind this process is that the microstructure of these products has a glassy phase that may confine some dangerous heavy metals radioactive sources. The products are characterized (XRD, porosimetry, mechanical strength ...) according to their content of additives, firing temperature... The overall results are encouraging and allow us to offer the optimal settings for a beneficial substitution of clays by phosphogypsum and fly ash for the development of clay brick.Résumé L'industrie des céramiques traditionnelles, en particulier celle des matériaux de construction, connaît actuellement un important essor au Maroc. Une demande croissante se traduit par la création ou l'expansion de plusieurs unités de production (cimenteries, briqueteries,...). Ces matériaux, produits en fort tonnage, sont susceptibles de confiner certains déchets industriels dans un souci de respect environnemental. Ce confinement ne doit avoir de retombées négatives ni sur la performance du matériau, ni sur la santé. Notre objectif est le recyclage de ces déchets (produits à plusieurs millions de tonnes annuellement) qui sont actuellement soit rejetés en mer ou stockés par leur Web of Conferences

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“…Other researchers studied the effects of kinetics on fly ash blended cements hydration at different curing temperatures. It was shown that at 20 and 35°C curing temperature, fly ash retards the hydration of cement in the early period while it accelerates the hydration in the later period (Narmluk and Nawa, 2011). The cylindrical shape of fly ash has a positive impact on the rheological properties of cement.…”

Section: Introductionmentioning

confidence: 99%