Caracterização mecânica das argamassas de assentamento para alvenaria estrutural - previsão e modo de ruptura

Mohamad, Gihad; Neto, Almir Barros da Silva Santos; Pelisser, Fernando; Lourénço, Paulo B.; Roman, Humberto Ramos

doi:10.1590/s1517-70762009000200006

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…A clear trend for the compressive strength decreases as the w/c ratio increases was found for all mortar mixes. This result is in agreement to results pointed out by (Appa Rao [13]; Mohamad et al [20]; Fernandes et al [33]). The increase in the w/c ratio means that there is more water between the solid particles and consequently there are more voids in hardened condition, increasing porosity and consequently leading to the decrease on the compressive strength.…”

Section: Compressive Strengthsupporting

confidence: 93%

“…Differences in the compressive strength due to the shape of specimens occur basically due to the slenderness of the samples (height to length ratio) and to the boundary restraint between the loading platens and the specimen. The experimental results of this study clearly indicated a difference between cylindrical (f c ) and prismatic (f p ) compressive strength of mortars, as observed also by Mohamad et al [20]. Prismatic specimens exhibited a higher compressive strength, which is agreement with the conclusions of Del Viso et al [30] and Stahli and Van Mier (2007), who observed that large specimens exhibit lower values of resistance than small specimens.…”

Section: Compressive Strengthsupporting

confidence: 91%

“…A total of 18 mortar mixes with fine and coarse sand grades were considered for the characterization of the compressive and flexural strength and modulus of elasticity, see Table 2. The water-cement ratios for all mixes were fixed based on the work performed previously (Mohamad et al [20] and Haach et al [21]).…”

Section: Materials Propertiesmentioning

confidence: 99%

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Influence of aggregates grading and water/cement ratio in workability and hardened properties of mortars

Haach

Vasconcelos

Lourenço

2011

Construction and Building Materials

206

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Mortar is the material responsible for distribution of stresses in masonry structures. Knowledge about the fresh and hardened properties of mortar is fundamental to ensure a good performance of masonry walls. Water/cement ratio and aggregates grading are among several variables that influence physical and mechanical behaviour of mortars. An experimental program is presented in order to evaluate the influence of aggregates grading and water/cement ratio in workability and hardened properties of mortars. Eighteen compositions of mortar are prepared using three relations cement:lime:sand, two types of sand and three water/cement ratios. Specimens are analyzed through flow table test, compressive and flexural strength tests. Results indicate that the increase of water/cement ratio reduces the values of hardened properties and increases the workability. Besides, sands grading has no influence in compressive strength. On the other hand, significant differences in deformation capacity of mortars were verified with the variation of the type of sand. Finally, some correlations are presented among hardened properties and the compressive strength.

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Section: Compressive Strengthsupporting

confidence: 93%

Section: Compressive Strengthsupporting

confidence: 91%

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Influence of aggregates grading and water/cement ratio in workability and hardened properties of mortars

Haach

Vasconcelos

Lourenço

2011

Construction and Building Materials

206

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“…Masonry strength depends not only on bricks and mortar strength, but also on factors such as joints thickness (Monteagudo et al, 2015), irregularities in the surfaces, water absorption (Rozo Rincón et al, 2014), maximum mortar aggregate size (Salamanca, 2001), size and pattern of the brick perforations, mortar shrinkage (Mohamad et al, 2009), quality of the workforce, brickwork, and so on (Arredondo, 1956).…”

Section: Compressive Strength Of Brickwork Specimensmentioning

confidence: 99%

Mechanical properties of load bearing walls made of uruguayan hollow ceramic bricks

Cabezas

2015

Revista de la Construcción

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This paper presents an analysis of the mechanical characteristics of masonry walls made of hollow ceramic uruguayan bricks, based on results obtained in laboratory tests that determine the compressive, bending and shear strength of brickwork specimens and the compressive strength of the hollow or perforated bricks used to manufacture them. It also discusses the way the specimens fail and the dependence of the masonry walls mechanical strength on the compressive strength of the bricks. A strong relationship between the compressive strength of brickwork specimens tested and the compressive strength of the bricks they were manufactured with, is observed. The equations that best appear to link these two mechanical characteristics, for bricks with compressive strengths up to 25 daN/cm2, were determined. However, is not observed a direct relation between tested brickwork specimens bending or shear strength, and the compressive strength of the bricks with which they were manufactured. It seems crucial, both in masonry bending and shear strength, the adhesion between ceramic bricks and mortar.

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“…O tipo de ruptura observado foi o mesmo observado por MOHAMAD [15] e [16] para prismas assentados com argamassa de traço 1:1:6 (proporção em volume entre cimento: cal: areia), ruptura dúctil com esmagamento da junta de assentamento e, para prismas assentados com argamassas de traço 1:1/4:3, ruptura frágil com trincas verticais cortando o bloco e argamassa. Os autores verificaram que as diferenças de deformação específica entre o bloco e a argamassa ocasionaram um aumento nas tensões de tração do bloco e, com isso, uma ruptura da alvenaria com cargas menores.…”

Section: Resistência Da Argamassaunclassified

Tipologia de blocos cerâmicos estruturais: influência da geometria dos blocos no comportamento mecânico da alvenaria

Rizzatti¹,

Roman

Mohamad

et al. 2011

Matéria (Rio J.)

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RESUMONeste trabalho são apresentados os resultados experimentais sobre compressão centrada de alvenarias estruturais de blocos cerâmicos. Foram estudadas quatro diferentes geometrias de blocos designados como A, B, C e D, sendo o primeiro e segundo (A e B) com septos arredondados com diferentes áreas líquidas, o terceiro bloco (C) com furos verticais no formato retangular e o último (D) com um duplo septo central. O programa experimental abrangeu os estudos de produção de blocos, prismas e paredes. Os prismas e paredes foram construídos com dois traços de argamassa 1:1:6 (I) e 1:0,5:4 (II) (proporções em volume de cimento:cal:areia). Para tanto, foram realizadas análises de resistência à compressão do bloco, prismas e paredes, construídos com essas geometrias em escala reduzida na proporção de 1:3 das dimensões nominais. Com base na análise dos resultados, pode-se concluir que o bloco tipo D, que possui duplo septo central, é o bloco mais eficiente para o uso em alvenaria estrutural entre os blocos analisados. As paredes construídas com os blocos do tipo D apresentaram uma melhor capacidade de absorver esforços verticais, devido à coincidência dos septos entre as fiadas subsequentes, provocadas pela existência de um duplo septo central. Além disso, não houve influência significativa da resistência à compressão da argamassa na resistência à compressão dos prismas e paredes.Palavras-chave: bloco cerâmico; alvenaria estrutural; geometria dos blocos.Typology of structural ceramics blocks: influence of the geometry of blocks on the mechanical behavior of masonry ABSTRACT This paper presents the experimental results of a research program with ceramic block masonry under compression. Four different blocks geometries were investigated (A, B, C and D). Two of them had circular hollows (A and B) with different net area. The third one had two rectangular hollows (C) and the last block contained rectangular hollows and double central webs (D). The prisms and walls were built with two mortar types 1:1:6 (I) and 1:0,5:4 (II) (proportions by volume of cement: lime: sand). Thus, compressive strength analyses of the blocks, prisms and walls, built with these geometries on a small scale in the proportion of 1:3 of the nominal dimensions were made. It was possible to conclude that the block with double central webs gave better results of compressive strength showing to be more efficient. The walls built with blocks type D had a better ability to absorb vertical efforts due to the coincidence of the cross webs, because of the double central webs. Furthermore, the compressive strength of the mortar didn´t influence the compressive strength of the prisms and walls.

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Caracterização mecânica das argamassas de assentamento para alvenaria estrutural - previsão e modo de ruptura

Cited by 6 publications

References 2 publications

Influence of aggregates grading and water/cement ratio in workability and hardened properties of mortars

Influence of aggregates grading and water/cement ratio in workability and hardened properties of mortars

Mechanical properties of load bearing walls made of uruguayan hollow ceramic bricks

Tipologia de blocos cerâmicos estruturais: influência da geometria dos blocos no comportamento mecânico da alvenaria

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