Ettringite formation

Prince, William; Espagne, M.; Aı̈tcin, Pierre-Claude

doi:10.1016/s0008-8846(02)01042-6

Cited by 129 publications

(30 citation statements)

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“…The estimated mass losses due to the presence of adsorbed polymers (considered the baseline due to the degradation of the inorganic phase) are 0.4 ± 0.1% for CÀSÀH/PCE102-6 and CÀSÀH/PCE23-6 and 0.2 ± 0.1% for CÀSÀH/PCE102-2 and CÀSÀH/PCE23-2. These semi-quantitative observations are in agreement with the literature [4][5][6][7][8][9][10], confirming the higher propensity of the PCEX-6 series to be adsorbed on the calcium silicate phase, as a result of the higher amount of charged carboxylic groups present on the backbone.…”

Section: Resultssupporting

confidence: 91%

“…These globules pack into a more open fractal structure compared with the higher side chain density sample (PCE102-2) and the pure CÀSÀH sample. This should be related to the fact that a PCE with a lower side chain density has a higher adsorption on the C 3 S starting powder as well as on the final CÀSÀH particles and hence affects more on the microstructure of CÀSÀH [4][5][6][7][8][9][10]. However, surprisingly, the PCE23-Y series (shorter PEO chain length) shows the reverse trend.…”

Section: Resultsmentioning

confidence: 97%

“…Each of these pieces can be tuned to produce several graft copolymers varying in the molecular weights and chemical structures. The effect of adding PCEs depends on the chosen chemical structure, which can dramatically alter the interaction between PCEs and the cement matrix [4][5][6][7][8][9]. The adsorption of the PCEs on the surface of the cement particles increases if the density or length of the PEO side chains is decreased.…”

Section: Introductionmentioning

confidence: 99%

“…While the influence of PCEs on the macroscopic observables of cement (rheology, mechanical properties, and hydration dynamics) has been reported in the literature [4][5][6][7][8][9], the change in the CÀSÀH microstructure due to the PCE additives remains mostly unknown. Very recently, we used small-angle neutron scattering (SANS) to study the microstructure of synthesized pure calcium-silicate-hydrate (I) gel (CÀSÀH (I)) [11].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural changes of globules in calcium–silicate–hydrate gels with and without additives determined by small-angle neutron and X-ray scattering

Chiang

Fratini

Lim

et al. 2013

Journal of Colloid and Interface Science

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a b s t r a c tThe microstructure of calcium-silicate-hydrate (CÀSÀH) gel, a major hydrated phase of Ordinary Portland Cement, with and without polycarboxylic ether (PCE) additives is investigated by combined analyses of small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) data. The results show that these comb-shaped polymers tend to increase the size of the disk-like globules but have little influence on the thickness of the water and calcium silicate layers within the globules. As a result, the fractal packing of the globules becomes more open in the range of a few hundred nanometers, in the sense that the mass fractal dimension diminishes, since the PCE adsorption on the globules increases the repulsive force between and polydispersity of the CÀSÀH units. Moreover, scanning electron microscope (SEM) study of the synthesized CÀSÀH gels in the micrometer range shows that the PCEs depress the formation of fibrils while enhancing the foil-like morphology.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural changes of globules in calcium–silicate–hydrate gels with and without additives determined by small-angle neutron and X-ray scattering

Chiang

Fratini

Lim

et al. 2013

Journal of Colloid and Interface Science

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“…Increase in alkalis in the system accelerate the hydration of cementitious materials and therefore result in rapid setting and difficulties with placement and curing of concrete. Prince et al (14) found that cementitious system containing high soluble alkali sulfates content experienced problems related to rapid stiffening. This was believed to be due to the lack of crystalline ettringite formation in the presence of high alkalis.…”

Section: A32 Significance Of Sulfate Content (%So 3 )mentioning

confidence: 99%

Compatibility of Cementitious Materials and Admixtures

Olek¹,

Paleti²

2012

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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. AbstractGrowing demand for creating more sustainable and durable concretes lead to the increased usage of various cementitious materials and chemical admixtures in the mixtures. However, the increased usage of these components resulted in more complex mixtures that sometimes cause unexpected incompatibility problems. This report summarizes the results of the investigation of the parameters that may lead to workability problems, early age hydration irregularities and difficulties in achieving quality air void system in both plain and fly ash cementitious mixtures. The present research work was performed in three major phases and the statistical modeling was used to aid in interpretation. Phase I involved evaluation of more than 100 different paste and mortar mixtures with respect to potential slump loss and hydration irregularities. The results showed that cements with high C3A and low SO3 content were more prone to incompatibility problems. It was also observed that mixes with lignin based water reducing agent (WRA) had higher tendency for rapid stiffening than mixes with polycarboxylate type superplasticizer (PCSP). Increased replacement of cement by class C ashes resulted in the development of abnormal secondary peaks in semi-adiabatic calorimetry curves and accelerated the setting behavior.The focus of phase II was on identifying material combinations that can result in problems related to air void generation and stability. The experiments were conducted on 18 different systems and included determination of foam drainage and foam index parameters. The results show that the amount of air entrainers required to obtain target air percentage, increased with the increase in the fly ash content in the mixture. Lignin based WRA had, in general, a higher air entraining effect than the super-plasticizer when used in combination with air entrainers. Also, five out of the six mixtures with most unstable air void system, identified using the foam drainage experiments, contained the PCSP.The third (and final) phase of the study involved production of 10 concrete mixtures to verify the incompatibility findings from the paste ...

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Effects of poly(ethylene glycol) branch chain linkage mode on polycarboxylate superplasticizer performance

Duan

Gao

et al. 2012

Polymers for Advanced Techs

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Polycarboxylate superplasticizers (PCs) with ether linkages and ester linkages between the main chains and the poly (ethylene glycol) (PEG) branch chains were synthesized, respectively. The effects of the PCs molecule linkage mode on the performance of concrete paste were investigated using the slump loss test and thermogravimetric analysis and analyzing fluidity, absorption, and setting time. Results showed that the linkage between main chains and PEG branch chains in PCs molecules had an important influence on the performance of cement paste and concrete prepared from them. PCs with ester linkages can endow the cement paste with higher fluidity and higher waterreduction ratio resulting from the higher absorption amount on the cement particles. This is related with the alternating distribution of the carboxyl groups and branch chains of PEG when different macromonomers are involved in the preparation of PCs. PCs containing ester linkages are more vulnerable than PCs with ether linkages in an alkali environment, leading to quicker slump loss and shorter setting times. In contrast, PCs with ether linkages had excellent fluidity and slump flow stability. A slightly different ettringite hydration product was observed during the early period of the hydration of cement paste that employed these two PCs.

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Ettringite formation

Cited by 129 publications

References 2 publications

Microstructural changes of globules in calcium–silicate–hydrate gels with and without additives determined by small-angle neutron and X-ray scattering

Microstructural changes of globules in calcium–silicate–hydrate gels with and without additives determined by small-angle neutron and X-ray scattering

Compatibility of Cementitious Materials and Admixtures

Effects of poly(ethylene glycol) branch chain linkage mode on polycarboxylate superplasticizer performance

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