Behaviour of masonry wallettes made from a new concrete formulation under combination of axial compression load and heat exposure: Experimental approach

Al-Sibahy, Adnan; Edwards, Rodger

doi:10.1016/j.engstruct.2012.09.028

Cited by 9 publications

(8 citation statements)

References 24 publications

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“…Nowadays, only few national works can be found on the fire assessment of structural elements, as realized by KIMURA [11]; MARTINS [12]; COSTA and SILVA [13]. Internationally, the works of NGUYEN et al [14][15]; NAHHAS et al [16]; AL-SIBAHY and EDWARDS [17] studied the performance of masonry subjected to fire. However, these studies utilize conventional fence blocks, namely, without load bearing capacity, and, with different geometries and resistance in respect to the masonry structural blocks found in Brazil.…”

Section: Introductionmentioning

confidence: 99%

Assess of hollow clay block masonry wallets under high temperature

et al. 2018

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The main goal of this study was the behavioral assessment at high temperatures of masonry wallets built with different geometries of hollow clay blocks. In total, four type of structural wallets were erected; blocks of 15 x 20 x 30 cm nominal dimensions (width x height x length) and compressive strength of 7, 10, 15 and 18 MPa were built, employing laying mortar with compression resistance of 6, 8 ,10 and 12 MPa, respectively. The wallets were submitted to a constant temperature of 900°C, up to 4 hours, while heated gases permeability, thermal insulation and mechanical resistance were assessed. As conclusions, it was possible to observe that some wallets demonstrated the best thermal insulation performance, above 4 hours. Regarding the mechanical resistance and the gas permeability, none of the wallets analyzed reached the flexural criteria established for the work.

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Section: Introductionmentioning

confidence: 99%

Assess of hollow clay block masonry wallets under high temperature

et al. 2018

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“…The mortar that holds masonry blocks together is usually made with sand and cement, and it is an important part of the structure [10]. Mortar takes up between 5-7% of the surface area of masonry walls [6]. The smaller the brick size the higher the percentage of mortar.…”

Section: Figure 23: Different Mortar Jointsmentioning

confidence: 99%

“…LWC can be made with different aggregates such as natural, processed, and unprocessed materials. LWC for insulation usually has a density less than 1450 kg/m 3 and strength as low as 0.5 MPa [6]. LWC aggregate contains numerous voids inside which lower its thermal conductivity and make it lighter and better at insulating.…”

Section: Effect Of Aggregates On Concrete Strengthmentioning

confidence: 99%

“…The smaller the cells the better the thermal resistance of the block. Blocks with staggered air cells are even more thermally resistant as the heat flow does not have a direct path to travel through [6]. Other important geometric concerns are the thickness of the faceshell relative to the thickness of the webs.…”

Section: Other Geometriesmentioning

confidence: 99%

“…A large portion of the research into concrete mix designs is conducted using small concrete cubes which are not always applicable to masonry blocks or masonry walls, and do not account for the effects of the mortar [3] [4] [5]. When research is conducted to investigate the effects of fire on masonry, the tests are normally conducted on small scale masonry walls (usually masonry prisms a few blocks high) [6] [7]. These smallscale tests are not as accurate at predicting the temperatures within the hollow cells, as the smaller scale reduces the negative effect of hot gasses travelling up through the cells.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Fire Resistance of Concrete Masonry Walls

Pope¹

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The purpose of this research was to understand the fire resistance of existing masonry construction and to identify ways to improve upon masonry's fire resistance. First, a literature review was conducted to determine the known effects fire had on concrete, and how this could change with different mix designs and temperature ranges. These included common mixes (such as normal-weight and lightweight concrete) as well as novel mixes (such as fly ash, recycled aggregate, or glass aggregate concrete). As masonry units have different geometries, research was also conducted to determine the effects different geometries have on the fire resistance of materials. Once this baseline was established, research was conducted on insulation materials, to determine which materials might be suitable and compatible with concrete masonry. Full scale experimental data was collected to determine how standard masonry units and building techniques reacted to the standard fire. Then new geometries and mix designs were tested to evaluate how the fire resistance was affected by these changes. After experimental data had been collected, thermal models were created to identify which masonry units could be tested in the future. Finally, novel concrete mixes were modeled and compared to determine their possible effect on the fire resistance of concrete masonry walls. The results showed that compartmentalisation of masonry blocks and walls improved the overall fire resistance, as heat flow through the hollow cells is the leading cause of insulation failure. Increasing the faceshell thickness or including insulation materials within the hollow cells improved the overall fire resistance. The data indicated that mortar joint types did not appear to have an impact on the insulation failure of masonry walls. Lightweight concrete mixes showed improved fire resistance when compared to normal weight concrete. Modeling results demonstrated that there are several new mix designs that can improve the thermal performance of masonry; however, with an increase in thermal performance there is usually a decrease in mechanical performance. The results of this research have helped establish a baseline for existing and novel masonry construction and provide recommendations iii for future study into improving the fire resistance of concrete masonry. iv I would like to thank the Canada Masonry Design Centre (CMDC) and the Canadian Masonry Producers Association (CCMPA) for their financial and in-kind support. I would especially like to extend my gratitude to Bennett Banting and David Stubbs for their personal involvement during my research. I would like to extend my gratitude to the Ottawa Fire Services OFS, especially Peter McBride and Sean Tracey, for their help with providing a location and support to continue my testing but more importantly their personal support and encouragment. I would like to thank the National Science and Engineering Research of Canada (NSERC), for their funding support. I would also like to thank Brendan Knapman from Rockwool for his time...

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