Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression

Abstract Brazilian standards regarding structural masonry does not consider the effect of bedding mortar properties on the strength and failure mode of masonry. Thus, the objective of this study was to evaluate the effect of bedding mortars with low strength and high entrained air content on the str...

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Main Authors: Isabela Naia Talhacoli, André Lübeck, Gihad Mohamad
Format: Article
Language:English
Published: Fundação Gorceix 2025-01-01
Series:REM: International Engineering Journal
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2025000100200&lng=en&tlng=en
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author Isabela Naia Talhacoli
André Lübeck
Gihad Mohamad
author_facet Isabela Naia Talhacoli
André Lübeck
Gihad Mohamad
author_sort Isabela Naia Talhacoli
collection DOAJ
description Abstract Brazilian standards regarding structural masonry does not consider the effect of bedding mortar properties on the strength and failure mode of masonry. Thus, the objective of this study was to evaluate the effect of bedding mortars with low strength and high entrained air content on the stress-strain curve and failure mode of masonry prisms under compression. The prisms were constructed from concrete or ceramic blocks (hollow core or solid) and mortars with low strength and high entrained air content. Three types of mortars were tested, one dry pre-mixed mortar and two ready-to-use, with open times of 36 and 72 h. All physical and mechanical properties of the materials were determined following Brazilian standards. Strain under compression was evaluated on two-block high prisms equipped with linear variable differential transformers (LVDT) placed on opposing faces. Results pointed out that both strength and strain of ceramic block prisms were affected by mortar strength. On the other hand, the concrete block prism strength was affected by mortar strength and porosity while strain was largely affected by mortar porosity. Failure modes differed between ceramic and concrete block prisms: ceramic prisms cracked from mortar joint crushing and resulted in structural failure, while concrete prisms lost block-mortar adhesiveness from joint crushing. Therefore the prism was no longer a single entity but was still able to withstand the axial compression stress test.
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publishDate 2025-01-01
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series REM: International Engineering Journal
spelling doaj-art-b9847cb8e90b4d45aacf274036d1d4642025-01-14T07:38:51ZengFundação GorceixREM: International Engineering Journal2448-167X2025-01-0178110.1590/0370-44672023780075Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compressionIsabela Naia Talhacolihttps://orcid.org/0000-0003-3038-8491André Lübeckhttps://orcid.org/0000-0001-5772-9933Gihad Mohamadhttps://orcid.org/0000-0002-6380-364XAbstract Brazilian standards regarding structural masonry does not consider the effect of bedding mortar properties on the strength and failure mode of masonry. Thus, the objective of this study was to evaluate the effect of bedding mortars with low strength and high entrained air content on the stress-strain curve and failure mode of masonry prisms under compression. The prisms were constructed from concrete or ceramic blocks (hollow core or solid) and mortars with low strength and high entrained air content. Three types of mortars were tested, one dry pre-mixed mortar and two ready-to-use, with open times of 36 and 72 h. All physical and mechanical properties of the materials were determined following Brazilian standards. Strain under compression was evaluated on two-block high prisms equipped with linear variable differential transformers (LVDT) placed on opposing faces. Results pointed out that both strength and strain of ceramic block prisms were affected by mortar strength. On the other hand, the concrete block prism strength was affected by mortar strength and porosity while strain was largely affected by mortar porosity. Failure modes differed between ceramic and concrete block prisms: ceramic prisms cracked from mortar joint crushing and resulted in structural failure, while concrete prisms lost block-mortar adhesiveness from joint crushing. Therefore the prism was no longer a single entity but was still able to withstand the axial compression stress test.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2025000100200&lng=en&tlng=enstructural masonrybedding mortarstress-strain behaviorentrained air contentfailure mode.
spellingShingle Isabela Naia Talhacoli
André Lübeck
Gihad Mohamad
Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression
REM: International Engineering Journal
structural masonry
bedding mortar
stress-strain behavior
entrained air content
failure mode.
title Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression
title_full Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression
title_fullStr Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression
title_full_unstemmed Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression
title_short Effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression
title_sort effect of bedding mortar with low strength and high entrained air content on the strain and failure mode of masonry prisms under compression
topic structural masonry
bedding mortar
stress-strain behavior
entrained air content
failure mode.
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2025000100200&lng=en&tlng=en
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AT gihadmohamad effectofbeddingmortarwithlowstrengthandhighentrainedaircontentonthestrainandfailuremodeofmasonryprismsundercompression