Flexural bond strength of natural hydraulic lime mortar and clay brick

In this paper, the effect of several brick and mortar mechanical and microstructural parameters on the maximum debonding force of the same glass fiber reinforced polymer (GFRP), applied on different bricks and on corresponding masonry panels, was investigated. GFRP sheets were bonded by epoxy resin to four different types of solid fired-clay brick and four types of masonry panels, manufactured using the same bricks and a natural hydraulic lime mortar. The reinforced specimens were subjected to bond tests to evaluate the maximum debonding force. Bricks and mortar were characterized in terms of compressive strength (in the case of bricks, along two different orthogonal directions), surface roughness and pore size distribution. Based on the results of the study, alongside brick mechanical properties in different directions, also brick microstructural parameters seem to play a very important role, which should be taken into account for fully explaining the experimental results.

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Flexural and Shear Bond Strength of Sediment Brick Masonry

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d5109.118419 ◽

2019 ◽

Vol 8 (4) ◽

pp. 6288-6294

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

Cement Mortar ◽

Strength Test ◽

Brick Masonry ◽

Clay Brick ◽

Lime Mortar ◽

Flexural Bond Strength ◽

Bond Strengths ◽

Masonry Units

This paper presents an experimental investigation of shear and flexural bond strength of masonry prisms for newly developed sediment masonry bricks. The masonry prisms were constructed in three levels stack-bonded prisms for shear bond strength test and five levels stack-bonded prisms for flexural bond strength test using cement mortar and cement-lime mortar with pre-wetted and dry masonry units. The bond strengths of sediment brick masonry were tested accordance with RILEM TC 127-MS and ASTM E518 for shear and flexural bond strengths respectively. The results were compared to clay brick and cementsand brick masonry. The results show that pre-wetted sediment brick masonry exhibits higher flexural and shear bond strengths of about 1.5 times and 5 times respectively compared to dry (nonwetted) sediment brick masonry. Using cement-lime mortar in pre-wetted sediment brick masonry leads to increment of the bond strengths and pre-wetting action is essential for sediment brick masonry to prevent failure of shear bond strength.

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Confinement of Clay Masonry Columns with SRG

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.747.350 ◽

2017 ◽

Vol 747 ◽

pp. 350-357 ◽

Cited By ~ 15

Author(s):

Lesley H. Sneed ◽

Christian Carloni ◽

Giulia Baietti ◽

Giacomo Fraioli

Keyword(s):

Cross Section ◽

Compressive Load ◽

Load Test ◽

Steel Fibers ◽

Load Bearing Capacity ◽

Hydraulic Lime ◽

Lime Mortar ◽

Natural Hydraulic Lime ◽

Test Parameters ◽

Hydraulic Lime Mortar

In this study, the behavior of clay masonry columns confined by steel reinforced grout (SRG) composite with a natural hydraulic lime mortar is investigated. An experimental study was carried out to understand the behavior of masonry prisms with a square cross-section confined by SRG composite jackets subjected to a monotonic concentric compressive load. Test parameters considered in this study are the density of steel fibers and column corner radius. The effectiveness of the confinement is studied in terms of load-bearing capacity with respect to unconfined columns.

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Bond Properties of NHL-Based Mortars with Viscosity-Modifying Water-Retentive Admixtures

Minerals ◽

10.3390/min11070685 ◽

2021 ◽

Vol 11 (7) ◽

pp. 685

Author(s):

Tomáš Žižlavský ◽

Patrik Bayer ◽

Martin Vyšvařil

Keyword(s):

Water Content ◽

Adhesive Strength ◽

Water Retention ◽

Minor Role ◽

Clay Brick ◽

Hydraulic Lime ◽

Natural Hydraulic Lime ◽

Binder Ratio ◽

Paste Viscosity ◽

A Minor

This article studies the influence of biopolymeric viscosity-modifying admixtures with water-retentive function on the physico-mechanical properties of natural hydraulic lime-based mortars and their adherence to the traditional fired-clay brick substrate. The use of admixtures increases the water/binder ratio, which in turn leads to a decrease in the strength of the mortars. The viscosity-modifying function improves the adhesive strength between mortar and pre-wetter brick by increasing the binder paste viscosity, while the water-retentive function along with increased water content may lead to a decrease in adhesive strength. On the contrary, water retention and increased water content are beneficial on a dry surface, while paste viscosity plays only a minor role. When subjected to temperature-varying cycles, the mortars are more prone to in-mortar failure during the pull-off test. The air-entraining function of some admixtures improves the frost resistance of the mortars; however, it would negatively affect the adhesive strength by incorporating pores into the contact zone between the mortar and brick substrate. This study showed that the use of some of the studied admixtures may improve the adhesion of mortar to the brick substrate.

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Experimental Analysis on Bond Behavior of GFRCM Applied on Clay Brick Masonry

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.747.542 ◽

2017 ◽

Vol 747 ◽

pp. 542-549

Author(s):

Marianovella Leone ◽

Valeria Rizzo ◽

Francesco Micelli ◽

Maria Antonietta Aiello

Keyword(s):

Mechanical Performance ◽

Tensile Tests ◽

Brick Masonry ◽

Test Results ◽

Clay Brick ◽

Hydraulic Lime ◽

Bond Behavior ◽

Existing Structures ◽

Strength Failure ◽

Hydraulic Lime Mortar

External bonded reinforcements (EBR), made by fibrous meshes embedded in a cementitious/hydraulic lime mortar, are getting a great deal of attention, mostly for strengthening, retrofitting and repair existing structures. In this context, the interest versus the FRCM (Fiber Reinforced Cementitious Matrix) is growing. The mechanical performance of these mortar-based reinforcements is not well known at the date and it needs to be investigated in terms of bond and tensile strength, strain and stiffness, in relation to the type of both substrate and fibers. The present work reports the results of an experimental study, still in progress, on different pre-cured GFRP grids embedded in inorganic matrices and applied on clay brick masonry. First, the mechanical properties of both pre-cured GFRP grid and GFRCM reinforcements were obtained through tensile tests. Then, the experimental investigation on bond behavior was carried out by direct shear bond test. The test results were collected and processed to evaluate bond strength, failure mode, load-slip relationship.

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