Cement and Concrete Research

2000

DOI: 10.1016/s0008-8846(00)00402-6

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Limestone-filled pozzolanic cement

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Influence Of the Aggregate Characteristics3

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Cited by 170 publications

(81 citation statements)

References 8 publications

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“…In this sense, during portlandite carbonation, the calcite of the aggregate provides nucleating sites for the crystal growth. This syntaxial growth process develops strength enhancing the binder-aggregate interface [25,32]. As is discussed later, the percentage of large diameter pores in specimens with limestone aggregate is lower than with silico-calcareous aggregate: this fact supports these considerations and justifies the higher strength for the limestone aggregates.…”

Section: Influence Of the Aggregate Characteristicsmentioning

confidence: 88%

Mechanical properties of masonry repair dolomitic lime-based mortars

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et al. 2006

Cement and Concrete Research

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180 different mortars made with a dolomitic lime and different aggregates were prepared in order to be used in restoration works. This paper focuses on the effect of technological variables on pore structure and mechanical properties of dolomitic lime-based mortars. Compressive and flexural strengths of the specimens were discussed according to curing time, binder:aggregate ratios, attributes of the aggregates and porosity, at long-term tests.A strong increase in the strength of mortars has been found after 365 curing days as compared to 28 curing days. The strength has been mainly attributed to the portlandite carbonation, because no significant changes have been observed in the brucite. However, higher strengths than similar aerial lime-based mortars led to think in other mechanism which increases the strength: the calcite formation through a reaction of dedolomitization (alkali carbonate reaction, ACR) and the brucite crystallization were discussed.The pore structure has presented a significant influence on the strength. More binder amounts mean more strength due to the higher values of open porosity, which allows the carbonation process. The aggregate characteristics have been correlated with the strength and porosity. Limestone and angle-shaped aggregates, reducing large pores, cause a strength increment.

“…In this sense, during portlandite carbonation, the calcite of the aggregate provides nucleating sites for the crystal growth. This syntaxial growth process develops strength enhancing the binder-aggregate interface [25,32]. As is discussed later, the percentage of large diameter pores in specimens with limestone aggregate is lower than with silico-calcareous aggregate: this fact supports these considerations and justifies the higher strength for the limestone aggregates.…”

Section: Influence Of the Aggregate Characteristicsmentioning

confidence: 88%

Mechanical properties of masonry repair dolomitic lime-based mortars

¹

,

²

,

³

et al. 2006

Cement and Concrete Research

View full text Add to dashboard Cite

180 different mortars made with a dolomitic lime and different aggregates were prepared in order to be used in restoration works. This paper focuses on the effect of technological variables on pore structure and mechanical properties of dolomitic lime-based mortars. Compressive and flexural strengths of the specimens were discussed according to curing time, binder:aggregate ratios, attributes of the aggregates and porosity, at long-term tests.A strong increase in the strength of mortars has been found after 365 curing days as compared to 28 curing days. The strength has been mainly attributed to the portlandite carbonation, because no significant changes have been observed in the brucite. However, higher strengths than similar aerial lime-based mortars led to think in other mechanism which increases the strength: the calcite formation through a reaction of dedolomitization (alkali carbonate reaction, ACR) and the brucite crystallization were discussed.The pore structure has presented a significant influence on the strength. More binder amounts mean more strength due to the higher values of open porosity, which allows the carbonation process. The aggregate characteristics have been correlated with the strength and porosity. Limestone and angle-shaped aggregates, reducing large pores, cause a strength increment.

“…In this sense, during portlandite carbonation, the calcite of the aggregate provides nucleating sites for the crystal growth. This syntaxial growth process develops strength enhancing the binder-aggregate interface [3,36].…”

Section: Influence Of the Aggregate Characteristicsmentioning

confidence: 99%

Mechanical properties of natural hydraulic lime-based mortars

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et al. 2004

Cement and Concrete Research

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“…The mechanical behavior of mortars has been related to these special microstructure zones [26]; (ii) the syntaxial growth process could take place during portlandite carbonation due to the calcite of the aggregate that provides nucleating sites for the crystal growth. This process develops strength enhancing the binder-aggregate interface [20,27]. Also, the shape of the aggregate grains appears to have some influence.…”

Section: Influence Of the Aggregate Characteristicsmentioning

confidence: 99%

Masonry repair lime-based mortars: factors affecting the mechanical behavior

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2003

Cement and Concrete Research

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ABSTRACT:The increasing use of lime-based mortars for the restoration of historic buildings and structures justifies the research on these materials. The focus of this paper is the effect of technological variables on pore structure and mechanical properties of lime-based mortars. The influence of curing time, binder:aggregate ratio, aggregate attributes and porosity is discussed. Mortars prepared with aerial lime, varying aggregate types and binder:aggregate ratios ranging from (1:1) to (1:5) by volume were tested. Compressive and flexural strength measurements, as well as X-ray diffraction and thermal studies, were performed after 3, 7, 28, 91, 182 and 365 days. A strong increase in strength of mortar mixtures after 365 curing days (as compared to 28 curing days) is found. In spite of the fact that larger amounts of binder increase the total porosity, the strength of these mixtures is also increased. A good interlocked structure is obtained as binder contents increase. Also, higher porosities allow better portlandite carbonation. A relationship between mechanical properties and pore structure was established. However, in case of binder excess, the increase in voids leads to a strength reduction. The use of calcareous aggregates improves strength more as compared to the use of siliceous aggregates. Factors as grain size distribution and grain shape of the aggregates have also been considered.

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