Rheological behavior as influenced by plasticizers and hydration kinetics

Emoto, Tomohiro; Bier, Thomas

doi:10.1016/j.cemconres.2007.01.009

Cited by 39 publications

(29 citation statements)

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“…In summary, the development of the v P in time shows that the incorporation of the SP admixtures inevitably retard formation of structure and setting phenomena of cement pastes. This further substantiates the results reported by other authors, when some other advanced techniques have been used [5][6][7][8][9][10][11][12][13]. PCE admixtures used in the study retard the solid network frame development more intensively especially during the setting period of the hydration process, resulting in the clearly evident plateau on the v P -t curves at this hydration period.…”

Section: Influence Of Sp Types and Dosages On The V P -T Curvessupporting

confidence: 88%

“…Advances in measurement and computer technologies in recent years have allowed the development of various advanced methods to study the influence of different SPs on the hydration process and formation of structure of cementitious materials. Most of these studies have shown that in conjunction with their well known cement dispersing function, the incorporation of SPs leads to a retardation of the hydration process [5][6][7][8][9][10] which is attributed to the dispersing action of these admixtures in the fresh state [8]. A delay in the setting process of superplasticized cement pastes has been also observed by many different techniques, such as impedance spectroscopy [8], electrical conductivity [11], electrical resistivity [4], and isothermal calorimetry [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Influence of superplasticizers on the evolution of ultrasonic P-wave velocity through cement pastes at early age

Trtnik¹,

Turk

2013

Cement and Concrete Research

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The paper discusses a possibility of using an ultrasonic wave transmission method to study the influence of superplasticizers on the formation of structure of cement pastes at early ages. When compared to mixtures without additives, lower P-wave velocity was found through superplasticized cement pastes, indicating that superplasticizers prevent formation of a solid network frame. Comparing to sulfonate naphthalene-formaldehyde superplasticizers, polycarboxylate ether (PCE) admixtures retarded the solid network frame development more intensively, resulting in a plateau on a P-wave velocity curve during the setting period. The length of the plateau is proportional to the dosage of the PCE and inversely proportional to the specific surface area of the hydration products developed, proving that the specific surface area of a solid phase affects the performance of the PCEs. Validation of ultrasonic results was determined on the basis of the temperature evolution of the material in time.

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Section: Influence Of Sp Types and Dosages On The V P -T Curvessupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Influence of superplasticizers on the evolution of ultrasonic P-wave velocity through cement pastes at early age

Trtnik¹,

Turk

2013

Cement and Concrete Research

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“…PA-pastes show a local minimum of viscosity after 17 or 33 minutes when 0.15 or 0.30 wt% of PA, respectively, were added. That local minimum may represent a stable zone where the structure of aggregates is being destroyed by shear stress, and viscosity rises again when hydration progresses and the bonding strength between particles increases [43].…”

Section: Resultsmentioning

confidence: 99%

Tailored setting times with high compressive strengths in bassanite calcium sulfoaluminate eco-cements

García-Maté

Londoño-Zuluaga

Torre

et al. 2016

Cement and Concrete Composites

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This work deals with the hydration of a calcium sulfoaluminate (CSA) eco-cement prepared with bassanite and different additives (type and content) at a fixed water/CSA ratio of 0.5. Pastes prepared with bassanite show high water demands, high viscosity values and short initial setting times which are related to the fast dissolution rate of bassanite and the subsequent precipitation of gypsum. These facts have a dramatic effect onto the mechanical strength values, and make necessary the addition of additives.Here, the addition of different amounts of specific retarders (polycarboxylate, tartaric acid and phosphonic acid) not only improved the workability of pastes and mortars, but also delayed the setting time, by modifying the dissolution rates of the phase(s), and improved mechanical strengths.Finally, mortars with high compressive strengths (46 and 84 MPa at 1 and 7 days of hydration, respectively) and, chiefly, tailored setting times with high strengths have been prepared.

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“…The high degree and duration of the fluidity that this admixture affords concrete are related to structural factors. The long lasting fluidity is induced when the main chain is shorter with longer and numerous lateral chains [28]. The use of PC admixtures makes it possible to reduce the water content by up to 40% producing workable high performance and increases the resistant of concrete.…”

Section: Introductionmentioning

confidence: 99%

Effect of Vinsuperplast on the Hydration Study of Rice Husk Ash Blended Cement

Gupta¹,

Singh²,

Pratap³

2015

IJRET

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For civil engineering the basic need is to produce high quality and high strength concrete. superplasticizers are used as high range water reducer and they improve the workability of concrete and mortar. In the present work several experimental programmes have been carried out in order to study the effect of Vinsuperplast on RHA blended cement. 2% Vinsuperplast with RHA blended cement and ordinary Portland cement increases the hydration and strength of cement which was measured by consistency measurement, setting time, non-evaporable water content, and free lime determination. 20% RHA blended cement gives better results in comparison to 10% RHA blended cement. The hydration mechanism of RHA blended cement with Vinsuperplast were tried to understand by using XRD, DSC and SEM techniques.

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Rheological behavior as influenced by plasticizers and hydration kinetics

Cited by 39 publications

References 0 publications

Influence of superplasticizers on the evolution of ultrasonic P-wave velocity through cement pastes at early age

Influence of superplasticizers on the evolution of ultrasonic P-wave velocity through cement pastes at early age

Tailored setting times with high compressive strengths in bassanite calcium sulfoaluminate eco-cements

Effect of Vinsuperplast on the Hydration Study of Rice Husk Ash Blended Cement

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