Interventions to historic masonries: Investigation of the bond mechanism between stones or bricks and grouts

Adami, Chryssi-Elpida; Vintzileou, Elizabeth

doi:10.1617/s11527-007-9235-z

Cited by 33 publications

(27 citation statements)

References 11 publications

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“…This finding is in accordance with the literature (summarized in [24]): It seems that the key parameter for the strength enhancement is the bond strength between grout and in situ materials [19] and not the compressive strength of the grout. Systematic experimental work on the bond properties between cement or ternary grouts and stones has demonstrated [1] that indeed tripartite grouts with reduced cement content may reach bond strengths equal to or higher than that exhibited by a cement grout of significantly higher compressive strength.…”

Section: Wallettes In Compression-failure Modementioning

confidence: 99%

Mechanical properties of three-leaf stone masonry grouted with ternary or hydraulic lime-based grouts

Vintzileou

Miltiadou-Fezans

2008

Engineering Structures

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110

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Section: Wallettes In Compression-failure Modementioning

confidence: 99%

Mechanical properties of three-leaf stone masonry grouted with ternary or hydraulic lime-based grouts

Vintzileou

Miltiadou-Fezans

2008

Engineering Structures

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110

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“…The research programme [10] aims to study the intime development of bond strength of grout-to-substrate interfaces. For this purpose, tension and shear tests were carried out at various ages (from 28 to 180 days).…”

Section: Research Programme-experimental Setup Materialsmentioning

confidence: 99%

The Bond Mechanism in Stone Or Brick to Grout Interfaces

Vintzileou

Adami

2007

Experimental Analysis of Nano and Engineering Materials and Structures

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An experimental research on the bond between masonry units and grout has been carried out at the National Technical University of Athens. In this study, tension and shear tests on composite substrate/grout specimens were performed. The composite specimens were consisted of two pieces of substrate connected with one grout joint. The substrate was either stone or brick, whereas hydraulic lime or tripartite (lime-pozzolan cement) or cement grouts were used. The experimental results have demonstrated that the developed tensile and shear bond strength of the studied hydraulic lime and tripartite grouts is comparable with those of cement-based grouts. Moreover, the value of the reached bond strength (tensile or shear) is governed mainly by the substrate characteristics and the binding properties of the grouts. It was also found that interfaces subjected to shear exhibited similar behaviour with interfaces within concrete; thus the beneficial effect of normal compressive stress on the interface was confirmed. Finally, the experimental results are used for the formulation of a Mohr-Coulomb criterion for grout to travertine joints in shear-compression and shear-tension. The results of this project clearly confirm the efficiency of grouts with medium or low mechanical properties (tripartite and hydraulic lime grouts) for retrofitting historic masonries.

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“…Commenting the behaviour of the grout mixes, one may observe that medium‐ or low‐strength grout mixes showed remarkable bonding properties for both substrates (Figures 6A,B). Actually, in case of marble, even though the cement and tripartite grout interfaces present differences in their in‐time behaviour (for reasons explained in [10]), all grout mixes reach quite similar values of the maximum shear resistance at the age of 3 months. Moreover, the shear slip corresponding to the values of maximum shear resistance is approximately equal to 0.7 mm (Table 4, Figure 7A) independently of the bonding material (i.e.…”

Section: Review Of the Hybrid‐direct Tension And Shear Test Resultsmentioning

confidence: 99%

“…The research programme [10] aims to study the in‐time development of bond strength of grout‐to‐substrate interfaces. For this purpose, tension and shear tests were carried out at various ages (from 28 to 180 days).…”

Section: Research Programme–experimental Setup Materialsmentioning

confidence: 99%

“…Regarding the grouts, four high injectability mixes having very different mechanical characteristics, were designed using the following materials in various proportions (Table 2): hydrated lime ( L ), Portland cement CEM I 42.5 ( C ), commercial pozzolan from Milos Island (0–75 μ m) (LA), commercial metakaolin METASTAR 501 (0–16 μ m) (MK) and commercial hydraulic lime NHL 5 (HL ) . Details regarding the criteria for the selection of the examined grout compositions are given [10]. The compressive and flexural strength of the grouts, measured on conventional specimens, are given in Table 3.…”

Section: Research Programme–experimental Setup Materialsmentioning

confidence: 99%

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The Bond Mechanism in Stone‐ or Brick‐to‐Grout Interfaces

Vintzileou

Adami

2009

Strain

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An experimental research on the bond between masonry units and grout has been carried out at the National Technical University of Athens. In this study, tension and shear tests on composite substrate/grout specimens were performed. The composite specimens were consisted of two pieces of substrate connected with one grout joint. The substrate was either stone or brick, whereas hydraulic lime or tripartite (lime–pozzolan cement) or cement grouts were used. The experimental results have demonstrated that the developed tensile and shear bond strength of the studied hydraulic lime and tripartite grouts is comparable with those of cement‐based grouts. Moreover, the value of the reached bond strength (tensile or shear) is governed mainly by the substrate characteristics and the binding properties of the grouts. It was also found that interfaces subjected to shear exhibited similar behaviour with interfaces within concrete; thus the beneficial effect of normal compressive stress on the interface was confirmed. Finally, the experimental results are used for the formulation of a Mohr–Coulomb criterion for grout to travertine joints in shear–compression and shear–tension. The results of this project clearly confirm the efficiency of grouts with medium or low mechanical properties (tripartite and hydraulic lime grouts) for retrofitting historic masonries.

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Interventions to historic masonries: Investigation of the bond mechanism between stones or bricks and grouts

Cited by 33 publications

References 11 publications

Mechanical properties of three-leaf stone masonry grouted with ternary or hydraulic lime-based grouts

Mechanical properties of three-leaf stone masonry grouted with ternary or hydraulic lime-based grouts

The Bond Mechanism in Stone Or Brick to Grout Interfaces

The Bond Mechanism in Stone‐ or Brick‐to‐Grout Interfaces

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