Influence of triethanolamine on the hydration product of portlandite in cement paste and the mechanism

Zhang, Yanrong; Kong, Xiangming; Lu, Zichen; Lu, Zhou; Zhang, Qing; Dong, Bo‐Qing; Xing, Feng

doi:10.1016/j.cemconres.2016.05.009

Cited by 174 publications

(44 citation statements)

References 22 publications

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“…Strength development of concrete is highly related to cement hydration . Accelerators, including soluble calcium salts such like calcium chloride, nitrate, and organic alkanoamines have been widely used to speed up the cement hydration process . However, these traditional accelerators also have many undesired drawbacks such as the promotion of steel corrosion, adverse effect on final strength etc .…”

Section: Introductionmentioning

confidence: 99%

“…3 Accelerators, including soluble calcium salts such like calcium chloride, nitrate, and organic alkanoamines have been widely used to speed up the cement hydration process. 4,5 However, these traditional accelerators also have many undesired drawbacks such as the promotion of steel corrosion, adverse effect on final strength etc. 6 In recent years, it was found that many nanoparticles, including nano-SiO 2 , nano-TiO 2 , nano-CaCO 3 , nano-C-S-H exhibit remarkable acceleration effect on cement hydration due to the nucleation effect.…”

Section: Introductionmentioning

confidence: 99%

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The effects of nano‐C‐S‐H with different polymer stabilizers on early cement hydration

et al. 2019

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A promising approach to accelerate cement hydration known as “seeding technology” has been discovered using nano‐particles to provide additional nucleation sites for growing of C‐S‐H. Two different types of polymer, polycarboxylate (PCE) and polysulfonate (PSE) were used as stabilizer to synthesize nano‐C‐S‐H via co‐precipitation process. The obtained C‐S‐H‐polymer composites were characterized by means of XRD, FTIR, thermogravimetric analysis (TGA), TEM, dynamic laser scattering (DLS), and BET. DLS measurement shows that the particle size of the obtained C‐S‐H‐polymer suspension ranges from 82.6 to 589.9 nm. The results of DLS and BET show that the particle size of the C‐S‐H particles synthesized using PCE polymer as stabilizer is smaller than those synthesized with PSE polymer, and hence the specific surface area is much higher. FTIR and TGA results confirm the presence of the polymers in the obtained C‐S‐H composites particles. XRD results indicate that the presence of the polymers reduces the crystallinity of C‐S‐H due to the absence of the d002 peak at 2θ of 7°. The calorimetry results show that the main hydration peak of cement is dramatically increased by the addition of the C‐S‐H‐polymer composites. It is interestingly found that the acceleration effect of the C‐S‐H‐polymer composites is linearly proportional to the total surface area of the nanoparticles introduced into the cement pastes. At the same time, it is found that the secondary hydration peak, usually known as the sulfate‐depletion peak, is greatly advanced by addition of the C‐S‐H nano‐particles in comparison with the blank cement paste. The acceleration effect of the nano‐C‐S‐H is further verified in a pure C3S system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effects of nano‐C‐S‐H with different polymer stabilizers on early cement hydration

et al. 2019

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“…This result can be explained by hydration degree of cement paste. Researcher hypothesized that these types of chemical may affect reduction of Ca(OH) 2 in hydrated cement paste [8]. As seen in Figure 2, Ad2 has no adverse effect on the compressive strength of the samples.…”

Section: Compressive Strengthmentioning

confidence: 99%

Usability of chemical additives to accelerate initial curing time of AAC

Dalgıçer¹,

Kavas

Uzgan³

2018

ce papers

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Autoclaved aerated concrete (AAC) products have been promising materials for the construction sector. For this reason, fast production techniques are becoming more important in this area. In the present study, effects of chemical accelerators on the initial curing time of AAC blocks have been studied. Two different organic additives (Ad1 and Ad2), which are commercial chemical agents used as setting accelerators in cement sector, were studied to investigate effects of curing times of G2/350 receipt. Ad1 and Ad2 were added into the raw materials mix of G2/350 recipe in proportion of 0.3, 0.6, and 0.9% of cement amount in raw materials mix during mixing process. Curing times of expended mud (cake) samples were measured by the hardening apparatus. On the other hand, mechanical, physical, and microstructural analyses of autoclaved samples were investigated.According to the results, it is determined that Ad1 and Ad2 can be used as a curing accelerator in production of AAC blocks. In addition to that Ad1 (in the amount of 0.3%) is the most suitable chemical agent to shorten initial curing time of R1 recipe of AAC.

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“…In practice, formulated accelerators are added to cement at a dosage varying in the range 1-5 wt%, where amines present in the formulation represent 0•02-0•25 wt% with respect to cement. In this study, a larger concentration range was used, with especially high concentrations tested in order to exacerbate the action of TEA (Zhang et al, 2016). The mixing equipment consisted of a radial flow impeller blade fixed to a Stuart SS30 mixer and a stainless steel beaker of volume 50 ml.…”

Section: Paste Preparationmentioning

confidence: 99%

“…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). Most of these studies were performed on cement pastes hydrated for relatively long periods (several months) and were focused on cement properties after setting.…”

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

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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.

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Influence of triethanolamine on the hydration product of portlandite in cement paste and the mechanism

Cited by 174 publications

References 22 publications

The effects of nano‐C‐S‐H with different polymer stabilizers on early cement hydration

The effects of nano‐C‐S‐H with different polymer stabilizers on early cement hydration

Usability of chemical additives to accelerate initial curing time of AAC

Influence of triethanolamine on cement pastes at early age of hydration

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