Rheological evaluations of interground and blended cement–limestone suspensions

Vance, Kirk; Arora, Aashay; Sant, Gaurav; Neithalath, Narayanan

doi:10.1016/j.conbuildmat.2014.12.054

Cited by 41 publications

(12 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4) was as follows: 10" from 0 to 45 rad/s [A1 point]; 30" at 45 rad/s [A 2 point]; 10" from 45 to 27 rad/s; 10" at 9 rad/s; 10" from 9 to 0 rad/s [C 1 point]; 10" rest [C 2 point]; 10" from 0 to 9 rad/s; 10" from 9 to 27 rad/s; 10" at 27 rad/s; 10" from 27 to 45 rad/s [A 2 point]; 30" at 45 rad/s [B 2 point] and 10" from 45 to 0 rad/s [C 3 point]. Trials were conducted during latent hydration at 25 °C because the vis cosity of these materials is strongly dependent on the shear rate applied and on the degree of hydration of the cement paste, so this experimental scheme minimizes the different cement hydration rate influence [7][8][9][10][11]19]. Fig.…”

Section: (°)mentioning

confidence: 99%

“…The findings were also applied to determine the most appropriate type of cycle to be used for each fresh paste. Suitability was defined in terms of the area of the hysteresis loop characteristic of the thixotropic behaviour of fresh pastes [7][8][9][10] (the larger the better) and the response observed in the Portland cements with different potential mineralogical compositions [11]. The best results were analysed and the rheological behaviour of the fresh Portland cement pastes studied after the inclusion of apparently inert (i.e., non-pozzolanic) fillers with variable origin, chemical composition, mineralogy, geology and particle size, shape and intimate texture.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Role of the filler on Portland cement hydration at very early ages: Rheological behaviour of their fresh cement pastes

Talero

Pedrajas

González

et al. 2017

Construction and Building Materials

View full text Add to dashboard Cite

The rheological behaviour of fresh Portland cement (PC) pastes with different chemical and potential mineralogical compositions was analysed when were blended with crystalline mineral additions (fillers). These two fillers were very different: a siliceous, Q, a-quartz type, and another limestone, C. Trials were conducted during latent hydration at 25 °C. The findings showed that apparent viscosity was higher in the PC with low C 3 A and high C 3 S content, consequently, the Na 2 O eq .(%) content of everyone also contributed very significantly. Moreover, it was also observed that the incorporation of each filler affects differently the rheological behaviour of fresh cement pastes. The different influence is due to the different physical and chemical properties of each filler (nature, chemical composition and character and texture intimate of the particles), and also of the type of PC to interact. Finally and at these very early ages, both fillers stimulated the hydration of the PC which they were mixed by direct and non-direct way, and in the case of C filler by indirect way as well, but without any pozzolanic activity. Despite the fact that blended cement P1/Q 60/40 has proved to be a ''false positive" in Frattini test.

show abstract

Section: (°)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of the filler on Portland cement hydration at very early ages: Rheological behaviour of their fresh cement pastes

Talero

Pedrajas

González

et al. 2017

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…The upper plate was serrated to a depth of 1 mm and the lower plate to a depth of 0.15 mm to prevent slip at the shearing surface. The rheological sequence consisted of: (a) a stepped ramp up pre‐shear phase lasting approximately 80 seconds to homogenize the paste, (b) a subsequent stepped ramp‐up, and (c) a stepped ramp‐down, as shown in Figure A . Data acquisition was completed during only the final ramp‐up and ramp‐down phases, and only data from the down‐ramp portion was used to extract the rheological parameters.…”

Section: Binder Characterization Methodsmentioning

confidence: 99%

Linking fresh paste microstructure, rheology and extrusion characteristics of cementitious binders for 3D printing

et al. 2019

Self Cite

View full text Add to dashboard Cite

Cementitious binders amenable to extrusion-based 3D printing are formulated by tailoring the fresh microstructure through the use of fine limestone powder or a combination of limestone powder and microsilica or metakaolin. Mixtures are proportioned with and without a superplasticizer to enable different particle packings at similar printability levels. A simple microstructural parameter, which implicitly accounts for the solid volume and inverse square dependence of particle size on yield stress can be used to select preliminary material combinations for printable binders. The influence of composition/microstructure on the response of pastes to extension or squeezing are also brought out. Extrusion rheology is used in conjunction with a phenomenological model to better understand the properties of significance in extrusion-based printing of cementitious materials. The extrusion yield stress and die wall slip shear stress extracted from the model enables an understanding of their relationships with the fresh paste microstructure, which are crucial in selecting binders, extrusion geometry, and processing parameters for 3D printing. K E Y W O R D S3D printing, extrusion, microstructure, rheology, wall shear stress, yield stress

show abstract

“…1) was as follows: 10 00 from 0 to 45 rad/s [A1 point]; 30 00 at 45 rad/s [A 2 point]; 10 00 from 45 to 27 rad/s; 10 00 at 9 rad/s; 10 00 from 9 to 0 rad/s [C1 point]; 10 00 rest [C 2 point]; 10 00 from 0 to 9 rad/s; 10 00 from 9 to 27 rad/s; 10 00 at 27 rad/s; 10 00 from 27 to 45 rad/s [A 2 point]; 30 00 at 45 rad/s [B 2 point] and 10 00 from 45 to 0 rad/s [C 3 point]. Trials were conducted during latent hydration at 25 °C because the viscosity of these materials is strongly dependent on the shear rate applied and on the degree of hydration of the cement paste, so this experimental scheme minimizes the different cement hydration rate influence [11][12][13]. Yield stress (x 0 ) parameter values were also adjusted with the model that provides a better regression, in this case was Casson equation (Eq.…”

Section: Methodsmentioning

confidence: 99%

“…Yield stress (x 0 ) parameter values were also adjusted with the model that provides a better regression, in this case was Casson equation (Eq. (1)) [11][12][13]. Yield stress (x 0 ) parameter values were also adjusted with the model they provides a better regression, in this case was Casson equation (Eq.…”

Section: Methodsmentioning

confidence: 99%

Calcined clays for low carbon cement: Rheological behaviour in fresh Portland cement pastes

Aramburo

Pedrajas

Rahhal³

et al. 2019

Materials Letters

View full text Add to dashboard Cite

In this paper the rheological behavior of fresh Portland cement pastes mixed with different calcined clays was analyzed. For this purpose, two samples of Portland cement with different mineral composition (one with low C 3 A and high C 3 S content and another with low C 3 S and high C 3 A) were used combined with different replacement percentages of two calcined clays (two different metakaolin). Grounded aquartz was used as control as well. Both mineral admixtures had different crystallinity and morphology: the a-quartz is fully crystalline while metakaolin is completely amorphous with a very small crystalline fraction giving very high pozzolanic properties in the vitreous state. All determinations were performed in the hydration latency period. The results show that the fresh Portland cement paste with low C 3 A(%) content and high C 3 S(%) content present great shear strength and the replacement with calcined clays affects the rheological behavior of the fresh pastes depending on the greater or lower pozzolanic reactivity of the mineral addition.

show abstract

Rheological evaluations of interground and blended cement–limestone suspensions

Cited by 41 publications

References 29 publications

Role of the filler on Portland cement hydration at very early ages: Rheological behaviour of their fresh cement pastes

Role of the filler on Portland cement hydration at very early ages: Rheological behaviour of their fresh cement pastes

Linking fresh paste microstructure, rheology and extrusion characteristics of cementitious binders for 3D printing

Calcined clays for low carbon cement: Rheological behaviour in fresh Portland cement pastes

Contact Info

Product

Resources

About