Impact of four kinds of alkanolamines on hydration of steel slag-blended cementitious materials

Yang, Songge; Wang, Jianfeng; Cui, Suping; Liu, Hui; Wang, Xueli

doi:10.1016/j.conbuildmat.2016.09.060

Cited by 47 publications

(17 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For dosages higher than 0•40%, calcium aluminate hydration takes place during the first minutes of reaction (peak not visible) before calcium silicate hydration. As a consequence, the calcium aluminate hydrates that have developed might inhibit the formation of calcium silicate hydrates and retard the associated peak appearance until later than 90 h (Han et al, 2015;Ramachandran, 1976;Yang et al, 2017;Zhang et al, 2016).…”

Section: Influence Of Tea On the Chemical Reactivity Of Admixtured Cementioning

confidence: 99%

“…TEA is usually considered to improve cement compressive strength and, depending on the dosage used, it can also act as a set retarder or accelerator (Aggoun et al, 2008;Aiad et al, 2003;Heren and Ölmez, 1996). Regarding the hydration kinetics, TEA slows down the hydration of the calcium silicate phase, but enhances calcium aluminate hydration and, more particularly, ettringite formation (Han et al, 2015;Huang and Shen, 2014;Ramachandran, 1976;Yang et al, 2017;Yaphary et al, 2017). Furthermore, TEA appears to form complexes with cations such as iron, aluminium or calcium, which might favour the dissolution/precipitation of some mineral phases in cement (Gartner and Myers, 1993;Heinz et al, 2010;Perez, 2002;Yilmaz et al, 1993;Zhang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of triethanolamine on cement pastes at early age of hydration

Jachiet

Azéma

Saoût

et al. 2018

Advances in Cement Research

View full text Add to dashboard Cite

Activation is often associated with the favoured hydration of particular cementitious phases, which can be induced by complexation mechanisms. However, the dispersion state of pastes with admixtures may also influence hydration rates. The aim of this paper is to highlight the correlation between mesostructural organisation and chemical reactivity of cement pastes with an additive. The affinity of triethanolamine (TEA), an activator molecule, with cement grains was assessed by measurement of total organic carbon. Moreover, the influence of the amine on the dispersion state, sedimentation kinetics and rheological behaviour was studied. Finally, X-ray diffraction, aluminium nuclear magnetic resonance spectroscopy and isothermal calorimetry were used in order to study the chemical reactivity of cement in the presence of the admixture. The combination of these granular and chemical characterisations helped to understand the mode of action of TEA.

show abstract

Section: Influence Of Tea On the Chemical Reactivity Of Admixtured Cementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of triethanolamine on cement pastes at early age of hydration

Jachiet

Azéma

Saoût

et al. 2018

Advances in Cement Research

View full text Add to dashboard Cite

show abstract

“…The impact of accelerating admixtures on SCMs has been generally investigated on blended cements [9][10][11][12]. CaCl 2 has been shown to increase the reactivity of blast furnace slag after 10 h of hydration in slag-blended cements [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Accelerating Admixtures on the Reactivity of Synthetic Aluminosilicate Glasses

et al. 2022

View full text Add to dashboard Cite

This research aims at gaining a further understanding of the impact of accelerating admixtures on the reactivity of supplementary cementitious materials (SCMs), which are widely used as a clinker replacement in blended cements. This was done on synthetic glasses with controlled composition and structure that mimic two types of real SCMs (slag and calcium-rich fly ash). The effects of DEIPA, TIPA, NaSCN and Na2S2O3 on the glass dissolution, hydration kinetics and reaction products were investigated. The obtained results concluded that the pH of the NaOH solution and the composition of the synthetic glass play a key role on the effect of the admixtures. In 0.1 M NaOH (pH = 13.0), all the studied admixtures inhibited the dissolution of slag-like glasses while they enhanced the dissolution of Ca-rich fly ash-like glasses, being Na2S2O3 the admixture that led to the highest increase of the dissolution rate of the Ca-rich fly ash-type glasses. In 1 M NaOH solutions (pH = 13.8), only the alkali admixtures (NaSCN and Na2S2O3) enhanced the degree of reaction of both glasses. In slag-type glasses pastes mixed with 1 M NaOH, the addition of 2% Na2S2O3 induced the highest increase of their reactivity as inferred by the total heat release and the amount of bound water. This is related to the formation of a high amount of S(II)-AFm, in addition to C-A-S-H, that would increase the aluminium undersaturation of the pore solution and consequently the further dissolution of the glass.

show abstract

“…Triethanolamine (TEA) is one of the main molecules used as cement chemical admixture thanks to its various functions as grinding aid for cement manufacturing and its accelerating function, to regulate the setting time and to improve strength. Chemically, TEA slows down calcium silicate hydration, improves calcium aluminate hydration and extends the induction period ( [3][4][5][6] ). Regarding the mesostructural organization in the cement paste, TEA seems to disperse cement particles, allowing a better stabilization of the paste during the setting of cement ( 7 ).…”

Section: Introductionmentioning

confidence: 99%