Effect of total cementitious content on shear strength of high-volume fly ash concrete beams

Arezoumandi, Mahdi; Volz, Jeffery S.; Ortega, Carlos A.; Myers, John J.

doi:10.1016/j.matdes.2012.10.031

Cited by 36 publications

(20 citation statements)

References 9 publications

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“…8a1). On the 3rd day of hydration, the IR spectrum resembles mixture of non-hydrated PK fly ash and Ca(OH) 2 : there is a clearly visible band at about 3,640 cm -1 corresponding to the vibration of OH -in Ca(OH) 2 [14] as well as bands at 1,420 and 875 cm -1 related to vibration of CO 3 2-in CaCO 3 which was introduced into the paste with Ca(OH) 2 . The main, intense, broad ash band with the extreme at 1,070 cm -1 , typical for vibrations of Si(Al)-O in ashes [20,21], is also visible.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, development of new binders which may be an alternative for traditional Portland cement becomes priority objective, and it is an ongoing research topic in the scientific community. In these new binding materials, the greatest possible quantity of Portland cement clinker is substituted by other aluminosilicate materials, such as slag, metakaolin, and fly ash [1][2][3][4], which are often chemically activated [5][6][7][8][9]. Cementless binders, such as geopolymers, are also intensively studied.…”

Section: Introductionmentioning

confidence: 99%

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Comparative investigations of influence of chemical admixtures on pozzolanic and hydraulic activities of fly ash with the use of thermal analysis and infrared spectroscopy

Pacewska

Wilińska

2014

J Therm Anal Calorim

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The aim of this work is to investigate the influence of selected alkaline activators on pozzolanic and hydraulic activities of fly ashes using thermal analysis (TG/ DTG) and infrared spectroscopy (FTIR). Two types of fly ashes differing in chemical compositions, especially content of calcium components, were selected for investigations. The study was carried out for two types of samples: (1) fly ash-lime paste performed with low-calcium fly ash and (2) a paste performed with high-calcium fly ash and water without introduction of additional amount of Ca(OH) 2 . Chemical admixtures NaOH, Na 2 SO 4 , and Na 2 CO 3 were added to both the types of samples. It was confirmed that influence of chemical activators on pozzolanic and hydraulic properties of fly ashes strictly depends on the kind of fly ash and availability of Ca(OH) 2 . For example, in case of highcalcium fly ash, the most active action was exhibited by NaOH solution.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative investigations of influence of chemical admixtures on pozzolanic and hydraulic activities of fly ash with the use of thermal analysis and infrared spectroscopy

Pacewska

Wilińska

2014

J Therm Anal Calorim

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“…• fly ash cements containing not higher than 35% of fly ash (it is typical amount of fly ash), • high volume fly ash binders containing about 50% and higher of fly ash as cement replacement [11][12][13][14][15], • very high volume fly ash mixtures containing above 70% of fly ash [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Wilińska

Pacewska

2018

J Therm Anal Calorim

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Binders containing fly ash as cement substitute have been used for many years. Typical amount of fly ash in cement composite does not exceed 35% of mass of binder. Replacement of substantial amount of cement mass by fly ash results in retardation of hydration of binder and deterioration of some concrete properties, e.g. delay in setting time and reduction in early compressive strength. These inconveniences may be reduced using proper method of activation. In this paper, possibilities to activate binding mixtures containing high and very high amount of fly ash and low amount of Portland cement were discussed basing on the literature reports as well as on our own research results. Several activating methods were described, such as mechanical activation, exchanging of part of components of binder (cement, fly ash or both of them) by more reactive fine-grained material, chemical activation by the use of alkaline activators as well as combined methods. Possibilities of using these methods were discussed in relation to amount of fly ash introduced as replacement of cement and kind of fly ash used. Usefulness of calorimetry and thermal analysis methods was also presented.

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“…According to the World Business Council for Sustainable Development (WBCSD), emissions from Portland cement manufacturing vary in different regions of the world from 0.73 to 0.99 kg of CO 2 per kg of cement produced [2]. To reduce CO 2 emissions from a concrete structure, clinker content should be reduced by replacing part of Portland cement by supplementary cementitious materials (SCM) such as fly ash [2,3].…”

Section: Introductionmentioning

confidence: 99%

Microconcrete with partial replacement of Portland cement by fly ash and hydrated lime addition

et al. 2014

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Effect of total cementitious content on shear strength of high-volume fly ash concrete beams

Cited by 36 publications

References 9 publications

Comparative investigations of influence of chemical admixtures on pozzolanic and hydraulic activities of fly ash with the use of thermal analysis and infrared spectroscopy

Comparative investigations of influence of chemical admixtures on pozzolanic and hydraulic activities of fly ash with the use of thermal analysis and infrared spectroscopy

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Microconcrete with partial replacement of Portland cement by fly ash and hydrated lime addition

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