The prediction of compressive strength of ungrouted hollow concrete block masonry

Sarhat, Salah R.; Sherwood, Edward G.

doi:10.1016/j.conbuildmat.2014.01.025

Cited by 71 publications

(27 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As currently defined, the strength of masonry is governed by the strength of the blocks; i.e., the effects of mortar are underestimated, which explains why many authors have stated that the mortar does not significantly affect the strength of masonry [9,14,19,24].…”

Section: G Mohamad | F S Fonseca | a T Vermeltfoort | A Lubeckmentioning

confidence: 99%

“…Masonry versus mortar strength adapted from Sarhat and Sherwood [24] Stiffness plasticity degradation of masonry mortar under compression: preliminar results increase in the values of Poisson's ratio for the aggregate with the applied load; the volume of the cement paste decreased with applied load, while the rate of consolidation increased. Poisson's ratio of the cement paste was not uniform and, in general, it did not continuously increase with increasing load; the cement paste stress-strain curves in compression were nonlinear, and the nonlinearity increased with an increase in the water amount.…”

Section: Figurementioning

confidence: 99%

“…Such a failure evolution is depicted in Figure 3. Sarhat and Sherwood [24] compiled the results of several experimental investigations in an attempt to develop a model to predict the compressive strength of ungrouted hollow concrete block masonry. With respect to the mortar effect on the masonry compressive strength, a considerable scatter in data was determined, as shown in Figure 4.…”

Section: G Mohamad | F S Fonseca | a T Vermeltfoort | A Lubeckmentioning

confidence: 99%

“…In contrast, structural masonry is considered anisotropic and has not received the same attention as its concrete counterpart. Only a few studies have been conducted on the failure mechanism of masonry under a complex state of stresses and these studies have focused on the testing of the components [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. For concrete block masonry mortar is usually the soft component due to its high water-cement ratio and may actually control the deformation of the masonry [27][28].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stiffness plasticity degradation of masonry mortar under compression: preliminar results

Mohamad

Fonseca

Vermeltfoort

et al. 2018

Rev. IBRACON Estrut. Mater.

View full text Add to dashboard Cite

ResumoThe main goal of this research is to determine the mechanical properties of bedding mortar by assessing the mortar damage onset, the stiffness plasticity degradation and the apparent Poisson´s ratio under compression. Two mortar types, 1:0.5:4 and 1:1:6 (cement:lime:sand ratio), were used and tested at 28 days; specimens had diameter-to-height (d/h) ratios of 0.3 and 1.0. These diameter-to-height (d/h) ratios were chosen to evaluate the effect of confinement caused by the friction between the steel plates of the testing machine and the sample. Numerical models were developed, and their response compared with the experimental results. From the experimental results, it was concluded that there are meaningful differences in their responses with weak and strong mortar types and different d/h ratios. The d/h ratio influences the relationship between the stress and strength and the apparent Poisson´s ratio of the specimen, which is defined herein as the ratio of the horizontal to vertical strain, regardless of cracking of the specimen. The mortar damage onset and stiffness plasticity degradation for both mortar types and d/h ratio are different and depend on the stress/ strength ratio level. All samples with a d/h ratio of 0.3 show a constant decrease in the volumetric strain until failure but with negligible expansion on the horizontal deformation. In contrast, samples with a d/h ratio of 1.0 present an increase of stiffness after development of the first crack, which causes the increase of the sample volume. Numerical simulation and experimental results for mortar 1:0.5:4 with a d/h ratio of 0.3 are similar until approximately 10 MPa, after which the numerical results diverge from the experimental results. For the d/h ratio of 1.0, the vertical strain results are also similar, but the horizontal strains results near failure are very different. The model can not represent the nonlinear increase of the horizontal strain near failure probably because the crack propagation and the stiffness plasticity degradation could not be controlled. For mortar 1:1:6, vertical strains from numerical and experimental results are similar, but again the model can not reproduce the nonlinear increase of horizontal strain near failure.Keywords: bedding mortar, damage onset, vertical strain, horizontal strain, strain difference, confinement effect.O objetivo principal desta pesquisa é determinar as propriedades mecânicas da argamassa de assentamento à compressão, avaliando o início do dano, perda de rigidez e variação do coeficiente de Poisson aparente. Foram testados dois tipos de argamassa, com traços em volume de 1:0,5:4 e 1:1:6 (cimento, cal e areia), testadas aos 28 dias, com corpos de prova de prova cilíndricos com duas relações diâmetro/altura (d/h), de 0,3 e 1,0. Estas relações diâmetro/altura foram escolhidas de forma a avaliar o efeito do confinamento causado pelo atrito entre os pratos de aplicação de carga da prensa e o corpo de prova. Foram desenvolvidos, também, modelos numéricos de maneira a confrontar os res...

show abstract

Section: G Mohamad | F S Fonseca | a T Vermeltfoort | A Lubeckmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: G Mohamad | F S Fonseca | a T Vermeltfoort | A Lubeckmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stiffness plasticity degradation of masonry mortar under compression: preliminar results

Mohamad

Fonseca

Vermeltfoort

et al. 2018

Rev. IBRACON Estrut. Mater.

View full text Add to dashboard Cite

show abstract

“…They reported that the SBA could be incorporated into the CEBs and masonry without damage to the mechanical properties. Sherwood [2] used a simple and accurate empirical formula to predict the compressive strength of ungrouted hollow concrete block masonry. The study showed that the proposed formula gave the most accurate prediction of compressive strength with the least variation.…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength and Block-Mortar Bond of a New-Type of Insulation Hollow Block

Bai

Kang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

A students' challenge for the estimation of the maximum compressive load of masonry prisms / Studentenwettbewerb zur Ermittlung der maximalen Druckfestigkeit von Mauerwerksprismen

et al. 2016

View full text Add to dashboard Cite

The paper presents the “IMC Students' Challenge” competition held in 2014, during the 9th International Masonry Conference, in Guimarães. The objective of the competition was to predict the maximum compressive load of two masonry prisms built of solid bricks, and of hollow blocks, with mortar joints. To increase the complexity of the problem, all prisms were tested under eccentric load. The students, who enthusiastically participated in the final laboratory tests, presented different approaches to estimate the maximum eccentric compressive force on masonry prisms. The challenge was a great experience, not only for students and conference participants, but also for sponsors and organizers.

show abstract

The prediction of compressive strength of ungrouted hollow concrete block masonry

Cited by 71 publications

References 5 publications

Stiffness plasticity degradation of masonry mortar under compression: preliminar results

Stiffness plasticity degradation of masonry mortar under compression: preliminar results

Compressive Strength and Block-Mortar Bond of a New-Type of Insulation Hollow Block

A students' challenge for the estimation of the maximum compressive load of masonry prisms / Studentenwettbewerb zur Ermittlung der maximalen Druckfestigkeit von Mauerwerksprismen

Contact Info

Product

Resources

About