scholarly journals Performance of Blended Cements with Limestone Filler and Illitic Calcined Clay Immediately Exposed to Sulfate Environment

2020 ◽  
pp. 655-664
Author(s):  
Agustin Rossetti ◽  
Tai Ikumi ◽  
Ignacio Segura ◽  
Edgardo F. Irassar
Keyword(s):  
Limestone Filler ◽  
Calcined Clay ◽  
Blended Cements

Blended Cements with Limestone Filler and Kaolinitic Calcined Clay: Filler and Pozzolanic Effects

2017 ◽  
Vol 29 (9) ◽  
pp. 04017116 ◽  
Author(s):  
Alejandra Tironi ◽  
Alberto N. Scian ◽  
Edgardo F. Irassar
Keyword(s):  
Limestone Filler ◽  
Calcined Clay ◽  
Blended Cements

Effectiveness of PCE superplasticizers in calcined clay blended cements

2021 ◽  
Vol 141 ◽  
pp. 106334
Author(s):  
Ran Li ◽  
Lei Lei ◽  
Tongbo Sui ◽  
Johann Plank
Keyword(s):  
Calcined Clay ◽  
Blended Cements

Ternary Blended Cement with Limestone Filler and Kaolinitic Calcined Clay

2015 ◽  
pp. 195-201 ◽  
Author(s):  
Alejandra Tironi ◽  
Alberto N. Scian ◽  
Edgardo F. Irassar
Keyword(s):  
Blended Cement ◽  
Limestone Filler ◽  
Calcined Clay

scholarly journals Consumption of superplasticizer admixture for different cements and their binder efficiency

2019 ◽  
Vol 12 (6) ◽  
pp. 1260-1287
Author(s):  
R. T. CECEL ◽  
P. C. R. A. ABRÃO ◽  
F. A. CARDOSO ◽  
V. M. JOHN
Keyword(s):  
Water Content ◽  
Environmental Impacts ◽  
Cement Content ◽  
The Other ◽  
Carbon Intensity ◽  
Limestone Filler ◽  
Blended Cements ◽  
Significant Variability ◽  
Optimum Content ◽  
Flow Table

Abstract The optimum content of ether polycarboxylate-based superplasticizer, determined by rotational rheometry, and its effects on the environmental impacts of concretes were studied for cement and limestone filler. To assess the consistency and water reduction, flow-table tests were performed. Then, cement content reduction and binder and carbon intensity indexes were determined through estimation based on theoretical concretes. The evaluated pure and blended cements present significant variability of the optimum consumption of the admixture. The fillers consumed less superplasticizer per area than the other materials and compositions with fillers allowed for greater reduction of water content. The mixtures with superplasticizer presented lower cement rate and binder and carbon intensity indexes. The usage of this type of admixture in optimal content can reduce environment impacts, according to the parameters analyzed.

scholarly journals Portland Cements with High Content of Calcined Clay: Mechanical Strength Behaviour and Sulfate Durability

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4206 ◽  
Author(s):  
Carlos H. Aramburo ◽  
César Pedrajas ◽  
Rafael Talero
Keyword(s):  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Chemical Effect ◽  
Portland Cements ◽  
Calcined Clay ◽  
Blended Cements ◽  
Sulfate Resistance ◽  
Type Iv ◽  
Mechanical Strengths ◽  
Mineralogical Compositions

Calcined clay has become the supplementary cementitious materials with the greatest potential to reduce the clinker/cement. In this research, the mechanical strengths and sulphate resistance of blended cements with a high content of calcined clay as a pozzolanic addition were evaluated to demonstrate that these cements could be designed as CEM (cement) type IV/A-SR and IV/B-SR cements by the current European standard UNE-EN 197-1: 2011. The blended cements were prepared by two Portland cements (P1 and PY6) with different mineralogical compositions and a calcined clay. The level of replacement was greater than 40% by weight. The results obtained confirm the decrease in the mechanical strengths and the increase in the sulfate resistance of the two Portland cements when they are replaced by calcined clay at a level of replacement greater than 40%. These results are a consequence of the chemical effect from the pozzolanic activity of the calcined clay. Therefore, there is an important decrease in portlandite levels of paste liquid phase that causes the increase in sulfate resistance and the decrease of the mechanical strengths.

Effectiveness of Amphoteric PCE Superplasticizers in Calcined Clay Blended Cements

2020 ◽  
pp. 201-209
Author(s):  
Marlene Schmid ◽  
Ricarda Sposito ◽  
Karl-Christian Thienel ◽  
Johann Plank
Keyword(s):  
Calcined Clay ◽  
Blended Cements

Approaches to achieve fluidity retention in low-carbon calcined clay blended cements

2021 ◽  
pp. 127770
Author(s):  
Ran Li ◽  
Lei Lei ◽  
Tongbo Sui ◽  
Johann Plank
Keyword(s):  
Low Carbon ◽  
Calcined Clay ◽  
Blended Cements

Pozzolanic Efficiency of Calcined Clays in Blended Cements with Focus on the Early Hydration

2021 ◽  
pp. 1-32
Author(s):  
Nancy Beuntner ◽  
Karl-Christian Thienel
Keyword(s):  
Reaction Mechanism ◽  
Pore Solution ◽  
Isothermal Calorimetry ◽  
Mineralogical Composition ◽  
Early Hydration ◽  
Supplementary Cementitious Material ◽  
Calcined Clay ◽  
Blended Cements ◽  
Combination Of Methods ◽  
The Impact

The fundamental knowledge about the reaction mechanism of calcined clays in cement and the mutual interaction is important for their assessment as supplementary cementitious material and the resulting concrete properties. In this study, the hydration of two cements differing in alkali content and with the addition of a highly reactive, aluminum-rich metakaolin and one calcined common clay with low kaolinite content was investigated during the first 48 hours. For this purpose, four established methods that describe the early hydration were used: isothermal calorimetry, thermogravimetry, in-situ X-ray diffraction and chemical analysis of pore solution. This so far unique combination of methods enabled the understanding of the complex binder (cement-calcined clay) hydration behavior. The results showed considerable differences depending on type of calcined clay, its chemical-mineralogical composition, fineness and especially towards its reaction mechanism with aluminate clinker phases controlled by the composition of pore solution. The impact of calcined clay on the early clinker hydration exceeds significantly physical effects only.

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