Ettringite formation on the aggregate — cement paste interface

Monteiro, J; Mehta, PK

doi:10.1016/0008-8846(85)90049-3

Cited by 52 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Within 10 µm of the aggregate surface, Scrivener, Crumbie et al (2004) stated that there were higher percentage of calcium hydroxide. Monteiro and Mehta (1985) measured higher percentage of ettringite in the interfacial transition zone. The microstructure of layer within 20 µm from aggregate surface was similar to that of cement paste bulk.…”

Section: Weak Layer In Composite Specimenmentioning

confidence: 86%

Interfacial Tensile Bond between Substrate Concrete and Repairing Mortar under Freeze-Thaw Cycles

Qian

Zhang

Ueda

2016

ACT

View full text Add to dashboard Cite

Freeze-thaw cycle is one of the major damage factors of concrete patch repair. Not only the material itself but also the adhesive interface is damaged under freeze-thaw cycles (FTC). Air-entraining agent has long been used to increase the freeze-thaw resistance of concrete materials. However, the effect of air-entraining agent on the adhesive interface has not been explored. The degradation mechanism and failure mode of concrete repair system under FTC has not been studied, either. In this study, three kinds of substrate concrete were casted and repaired by two kinds of ordinary Portland cement mortars and one kind of polymer-modified cement mortar (PCM), respectively. With up to 150 FTC, splitting tensile strength and failure modes of composite specimens were experimented. Results showed that air-entraining agent in the repairing mortar greatly influenced adhesive tensile strength under FTC. The water cement ratio and air-entraining agent of substrate concrete insignificantly affected the adhesive interface, but affects failure mode. The adhesive tensile strength of PCM-repaired composite specimens decreased faster than that of ordinary Portland cement mortar-repaired composite specimens although PCM itself showed stronger freeze-thaw resistance than ordinary mortar.

show abstract

Section: Weak Layer In Composite Specimenmentioning

confidence: 86%

Interfacial Tensile Bond between Substrate Concrete and Repairing Mortar under Freeze-Thaw Cycles

Qian

Zhang

Ueda

2016

ACT

View full text Add to dashboard Cite

show abstract

“…Siliceous aggregates are associated with greater swelling than of limestone aggregates. Considering the important role played by the cement paste-aggregate interface in the DEF reaction mechanisms [22][23][24], siliceous aggregates were used during this study (from the Oscar Savreux quarry). This type of aggregate has demonstrated its responsiveness to DEF [17,2].…”

Section: Methodsmentioning

confidence: 99%

Characterization of the expansion due to the delayed ettringite formation at the cement paste-aggregate interface

Jebli¹,

Jamin²,

Pelissou

et al. 2021

Construction and Building Materials

View full text Add to dashboard Cite

Delayed Ettringite Formation (DEF), is one of the different Internal Sulfate Attack (ISA), is a slow chemical reaction that can be responsible for the degradation of cementitious materials, through the swelling of the material followed by crack diffusion in the structure. The objective of this study is the experimental characterization at the local scale (10 x 10 x 30 mm 3 samples) of the concrete reached by DEF. The composite samples, consist of a 15 mm thick cement paste placed in contact with a siliceous aggregate. The shape of these samples makes it possible to study the mechanical behavior of the interface between the cement paste and the aggregate. This zone is identified as a privileged zone of the development of DEF. Given the slowness of this pathology, the experimental setting in the laboratory is accelerated by choosing conditions favoring the appearance of DEF. The tests are exploited at the local scale by measuring expansions by image correlation of the degraded samples and by scanning electron microscope observations. The results showed a higher expansion at the cement paste-aggregate interface compared to the cement paste. A tensile test performed at local scale allowed to characterize the impact of DEF on mechanical properties of the cement paste-aggregate interface. A drop in strength was observed with heterogeneous formation and localization of ettringite inside the interface.

show abstract

“…The classical strengthporosity relationship model was based on the two-component system (Lea, 1970;Powers, 1958). The importance of the aggregate-paste interfacial zone, as the third and weakest component of concrete, has been recognized for some time (Mehta, 1986;Monteiro and Mehta, 1985). This zone is characterized mainly by its higher porosity.…”

Section: The Aggregate/paste Interfacementioning

confidence: 99%

Use of scanning electron microscopy in concrete studies

1998

View full text Add to dashboard Cite

This paper offers a brief review of the present use of scanning electron microscopy (SEM) in concrete studies, from the perspective of how research in materials science is translated into applications in construction engineering. It describes the scope of present use of the method, and attempts a prospective for the near future in areas where more work could make productive use of the technology. Selected case studies have also been discussed. The electron microscope has been used as a research tool in understanding the root cause of the differing performance of various types of concrete under various conditions, a development tool in making better concrete, and a diagnosis tool on problems like cracking of concrete. The paper also explains how sample preparation affects the type and quality of information which the SEM can produce.

show abstract

Ettringite formation on the aggregate — cement paste interface

Cited by 52 publications

References 4 publications

Interfacial Tensile Bond between Substrate Concrete and Repairing Mortar under Freeze-Thaw Cycles

Interfacial Tensile Bond between Substrate Concrete and Repairing Mortar under Freeze-Thaw Cycles

Characterization of the expansion due to the delayed ettringite formation at the cement paste-aggregate interface

Use of scanning electron microscopy in concrete studies

Contact Info

Product

Resources

About