Combined effect of chemical nature and fineness of mineral powders on Portland cement hydration

Kadri, El-Hadj; Aggoun, Salima; Schutter, Geert De; Ezziane, Karim

doi:10.1617/s11527-009-9519-6

Cited by 144 publications

(83 citation statements)

References 16 publications

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“…Based on the literature of expansive cement, it is evident that the volumetric expansion of expansive cement results from the combined effect of ettringite (a hydrous calcium aluminum sulfate mineral) formation and CaO hydration. In addition to the chemical strength, increasing the particle fineness also accelerates the hydration process [67]. Because of this reason, the fineness of the SCDA used in experiments of Soeda and Harada [51] were in the order of 2200~3000 cm 2 /g, which is similar to the fineness of C-S-A type and CaO type cement.…”

Section: Soundless Chemical Demolition Agent Generated Crack Propagationmentioning

confidence: 85%

An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

2016

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Global energy and material consumption are expected to rise in exponential proportions during the next few decades, generating huge demands for deep earth energy (oil/gas) recovery and mineral processing. Under such circumstances, the continuation of existing methods in rock fragmentation in such applications is questionable due to the proven adverse environmental impacts associated with them. In this regard; the possibility of using more environmentally friendly options as Soundless Chemical Demolition Agents (SCDAs) play a vital role in replacing harmful conventional rock fragmentation techniques for gas; oil and mineral recovery. This study reviews up to date research on soundless cracking demolition agent (SCDA) application on rock fracturing including its limitations and strengths, possible applications in the petroleum industry and the possibility of using existing rock fragmentation models for SCDA-based rock fragmentation; also known as fracking. Though the expansive properties of SCDAs are currently used in some demolition works, the poor usage guidelines available reflect the insufficient research carried out on its material's behavior. SCDA is a cementitious powdery substance with quicklime (CaO) as its primary ingredient that expands upon contact with water; which results in a huge expansive pressure if this CaO hydration reaction occurs in a confined condition. So, the mechanism can be used for rock fragmentation by injecting the SCDA into boreholes of a rock mass; where the resulting expansive pressure is sufficient to create an effective fracture network in the confined rock mass around the borehole. This expansive pressure development, however, dependent on many factors, where formation water content creates a negative influence on this due to required greater degree of hydration under greater water contents and temperature creates a positive influence by accelerating the reaction. Having a precise understanding of the fracture propagation mechanisms when using SCDA is important due to the formation of complex fracture networks in rocks. Several models can be found in the literature based on the tangential and radial stresses acting on a rock mass surrounding an SCDA charged borehole. Those fracture models with quasi-static fracturing mechanism that occurs in Mode I type tensile failure show compatibility with SCDA fracturing mechanisms. The effect of borehole diameter, spacing and the arrangement on expansive pressure generation and corresponding fracture network generation is important in the SCDA fracturing process and effective handling of them would pave the way to creating an optimum fracture network in a targeted rock formation. SCDA has many potential applications in unconventional gas and oil recovery and in-situ mining in mineral processing. However, effective utilization of SCDA in such application needs much extensive research on the performance of SCDA with respect to its potential applications, particularly when considering unique issues arising in using SCDA in different ...

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Section: Soundless Chemical Demolition Agent Generated Crack Propagationmentioning

confidence: 85%

An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

2016

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“…The effects of limestone have been observed to alter aspects of the cement performance through the proposed mechanisms of dilution, the filler effect (particle packing), and nucleation (4,6,(17)(18)(19)(20)(21)(22)(23). Many authors have observed that these mechanisms affect the hydration of the cement, subsequently modifying the performance of the overall system (4,6,(17)(18)(19)(20)(21)(22)(23)(24)(25)(26). It is important to note that these mechanisms are interrelated and act simultaneously, influencing many of the same parameters of the system.…”

Section: Mechanisms Associated With Limestone Replacements In Cementmentioning

confidence: 99%

Performance of Portland Limestone Cements: Cements Designed to Be More Sustainable That Include up to 15% Limestone Addition

Barrett¹

2013

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ACKNOWLEDGMENTSThis work was conducted in the Charles Pankow Concrete Materials Laboratory at Purdue University. As such, the authors gratefully acknowledge the support which has made this laboratory and its operation possible.The authors would like to thank Buzzi Unicem, Holcim, Lafarge, Lehigh Hanson, and Omya for graciously providing the cementitious materials for this research. JOINT TRANSPORTATION RESEARCH PROGRAMThe Joint Transportation Research Program serves as a vehicle for INDOT collaboration with higher education institutions and industry in Indiana to facilitate innovation that results in continuous improvement in the planning, design, construction, operation, management and economic efficiency of the Indiana transportation infrastructure. https://engineering.purdue.edu/JTRP/index_html Published reports of the Joint Transportation Research Program are available at: http://docs.lib.purdue.edu/jtrp/ NOTICEThe contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views and policies of the Indiana Department of Transportation or the Federal Highway Administration. The report does not constitute a standard, specification or regulation. AbstractIn 2009, ASTM and AASHTO permitted the use of up to 5% interground limestone in ordinary portland cement (OPC) as a part of ASTM C150/AASHTO M85. When this project was initiated a new proposal was being discussed that would enable up to 15% interground limestone to be considered in ASTM C595/AASHTO M234 cement. This project was initiated to provide rapid feedback to INDOT for use in discussions regarding these specifications (this has become ASTM C595/AASHTO M234). PLC is designed to enable more sustainable construction which may significantly reduce the CO2 that is embodied in the built infrastructure while extending the life of cement quarries. The physical and chemical properties of the cementitious materials used in this study were examined. PLC is typically a finer cement (10 to 30% Blaine fineness) with a reduction in the coarse clinker particles (>20µm) and an increase in fine particles which are primarily limestone. Isothermal calorimetry and chemical shrinkage results imply that these PLC materials have a similar or slight greater reaction and would be able to be used interchangeably with OPC in practice as it relates to the rate of reaction. The PLC mortars exhibited relatively similar activation energies compared to the corresponding OPCs allowing the maturity method to be used by INDOT for both the PLC and OPC systems. The mechanical properties of OPC and PLC were generally similar with the PLC typically having slightly higher early age strengths but similar 28 day strengths. No significant change in drying shrinkage or restrained shrinkage cracking was observed for the PLC when compared with OPC (Barrett et al. 2013 In 2009, ASTM and AASHTO permitted the use of up to 5% interground limestone in ordinary portland ceme...

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“…The replacement level of a filler and its fineness are the major factors affecting the hydration kinetics [8][9][10]. The first effect is related to the dilution of cement, which is equivalent to an increase in the water-cement ratio.…”

Section: Introductionmentioning

confidence: 99%

Insights into the mechanisms of nucleation and growth of C–S–H on fillers

Ouyang

Koleva

et al. 2017

Mater Struct

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A complete understanding of the mechanisms upon which a filler acts in a cement-based material, e.g. as a C-S-H nucleation and/or growthinducing factor, is of high importance. Although various studies report on accelerated cement hydration in the presence of fillers, the reason behind these observations is not completely understood yet. This work contributes to this subject, by providing an experimental evidence on the (electro) chemical aspects of the filler surface modification in the model solution, simulating the pore solution of cement paste. The nature of the various interactions with regard to the affinity of a filler surface towards C-S-H nucleation and growth was discussed in detail in this work with regard to zeta potential measurements of micronized sand and limestone particles in the model solutions. These results are further supported by microscopic observations of morphology and distribution of hydration products on the filler surfaces, together with considerations on thermodynamic principles in view of hydration products formation and distribution. The C-S-H nucleation and growth appeared to be due to the interactions between a filler surface and calcium ions in the pore solution. These interactions were determined by the chemical nature of the filler surface. The interaction mechanisms were found to be governed by relatively weak electrostatic forces in the case of micronized sand. This was reflected by a non-significant adsorption of calcium ions on the filler surface, resulting in non-uniformly distributed and less stable C-S-H nuclei. In contrast, the nucleation and growth of C-S-H on limestone particles were predominantly determined by donoracceptor mechanisms, following moderate acid-base interactions. Consequently, a strong chemical bonding of calcium ions to a limestone surface resulted in a large amount of uniformly distributed C-S-H nuclei.

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Combined effect of chemical nature and fineness of mineral powders on Portland cement hydration

Cited by 144 publications

References 16 publications

An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

Performance of Portland Limestone Cements: Cements Designed to Be More Sustainable That Include up to 15% Limestone Addition

Insights into the mechanisms of nucleation and growth of C–S–H on fillers

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