Stress rate sensitivity of stone masonry units bound with fibre reinforced hydraulic lime mortar

Islam, Md. Toihidul; Chan, Rachel; Bindiganavile, Vivek

doi:10.1617/s11527-011-9796-8

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Moreover, the flexural behavior of hydraulic lime mortar is more sensitive to strain rate than fiber-reinforced hydraulic lime mortar. Later, the bond behavior between the stone masonry block and the plain and fiber-reinforced hydraulic lime mortar was also investigated by Bindiganavile et al [17,18]. The results show that there was an improvement in the bond strength due to polypropylene microfibers (20 mm in length) but a difference in the fracture performance between the Portland cement-lime and hydraulic lime mortars.…”

Section: Introductionmentioning

confidence: 98%

Mechanical Behavior of Natural Hydraulic Lime Mortars

Garijo¹,

Zhang²,

Ruiz³

et al. 2019

Sustainable Construction and Building Materials

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Natural hydraulic lime (NHL) mortars are widely used for restoration works due to their good compatibility with the substrate material in terms of physical, chemical, and mechanical properties. Regarding their mechanical characterization, there is still a need for further understanding of their fracture behavior and the influence of their dosage methodology on the mechanical properties. Thus, this chapter focuses on the mechanical characterization of NHL mortars, such as flexural, compressive, and splitting tensile strengths, elastic modulus, and fracture energy. Moreover, the influence of the composition and production process on such properties was studied as well. Furthermore, the loading rate effect on the fracture behavior was also presented. The results show that NHL mortars have shape and size effect on the compressive strength. In addition, NHL mortar is rate sensitive, mainly due to the viscous effects caused by the presence of free water in the porous structure.

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Section: Introductionmentioning

confidence: 98%

Mechanical Behavior of Natural Hydraulic Lime Mortars

Garijo¹,

Zhang²,

Ruiz³

et al. 2019

Sustainable Construction and Building Materials

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“…Clearly, for the polypropylene fibre examined here, it is likely that the dosage for low permeability would be lower than 0.25% by volume. Whereas the fibre content was originally chosen on the basis of efficiency with bond strength and fracture toughness in the masonry [12], further examination is necessary to optimise the fibre dosage for superior water tightness. Applying nano-lime made significant improvement to the permeability characteristics of HLM as shown in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Water Permeability in Fibre Reinforced Hydraulic Lime Mortar Intended for Conservation

Bindiganavile

Islam

Suresh

2016

KEM

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Much of the existing water infrastructure across the world was constructed using masonry in the last 200 years and many of these structures were built with pre-Portland cement binders. Although these mortars exhibit good workability and high water retention in the plastic state, the water tightness deteriorates over the years resulting in a pressing need for suitable repair materials. The addition of polypropylene micorfibre in cement-based systems was found to be effective in reducing water permeability. But the effect of polymeric fibres on the permeability coefficient of hydraulic lime mortar (HLM) is unknown. Therefore, this paper focuses on measuring water permeability in fibre reinforced HLM. Besides, this study examined the application of nanolime onto the aforementioned mortars and its effect on their water permeability. Accordingly, a permeability cell was setup to monitor the onset of the steady state condition in fluid flow. Companion data was generated for the mechanical performance of these mortars. The results show that in hydraulic lime mortar, there is likely an optimal fibre dosage in order to reduce the permeability coefficient. Unlike with Portland cement mortar, this dosage is significantly lower. As well, applying nanolime was most beneficial in limiting water permeability in the natural hydraulic lime mortars.

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“…For plain mortar, the results show that the DIF for the modulus of rupture was 12 at a strain rate of 10 s -1 , while it was 53 for fracture toughness. Moreover, Bindiganavile et al [7,8] studied the bond behaviour between the stone masonry block and the plain and fiberreinforced hydraulic lime mortar. They observed an improvement of the bond strength due to the polypropylene micro-fibers.…”

Section: Introductionmentioning

confidence: 99%

Influence of loading rate on the fracture behaviour of natural hydraulic and aerial lime mortars

Zhang¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Natural hydraulic and aerial lime mortars are used extensively for restoration works due to their good compatibility with the substrate material in historical masonry construction. Recently, the study of the influence of loading rate of such materials is getting more attention due to the fact that many historic masonry structures are situated in zones of seismic activity. However, the references are still scarce in comparison to that of steel and concrete and the studies focused on the measurement of the influence of loading rate on the fracture energy are limited, although it is an important parameter to characterize the ductility and the fracture behaviour of the material. Thus, in the paper, an aerial and a natural hydraulic lime mortar specimens were tested at various loading rates (loading-point displacement rates) from the quasi-static one, 5.0 × 10 -4 mm/s, to rate sensitive ones, 5.0 × 10 -1 mm/s and 1.6 × 10 1 mm/s. For this purpose, it was used a servo-hydraulic testing machine up to its maximum range of velocities. The results show that the fracture energy and the peak load of both lime mortars are rate sensitive. The maximum dynamic increase factors of the fracture energy are 1.9 for both mortars, while 1.4 and 1.6 for the natural hydraulic and the aerial lime mortars, respectively, in the peak load. This behaviour is related to viscous effects of free water in the mortar.

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Stress rate sensitivity of stone masonry units bound with fibre reinforced hydraulic lime mortar

Cited by 9 publications

References 13 publications

Mechanical Behavior of Natural Hydraulic Lime Mortars

Mechanical Behavior of Natural Hydraulic Lime Mortars

Evaluation of Water Permeability in Fibre Reinforced Hydraulic Lime Mortar Intended for Conservation

Influence of loading rate on the fracture behaviour of natural hydraulic and aerial lime mortars

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