Analysis of deformability modulus by linear and nonlinear elastic methods in ceramic structural masonry and mortars

Abstract

There are studies analyzing the parameters of structural masonry strength, however few are performed evaluating the interference of the mortar in the deformability parameters. The objective of this study was to verify the theories of elasticity (Hooke’s linear model and nonlinear models by Ghosh, Duffing, and Martin, Roth, and Stiehler) applied to structural masonry. Ceramic blocks were pressed and fired at 890 ºC and mortars prepared with the proportion 1:1:5:0.5:2 of cement: hydrated lime: sand: PVA binder: water. The materials were tested in compression individually and in prisms with and without the use of mortars. The results obtained with the linear elastic analysis were incoherent since the deformability modulus obtained for the mortar prisms was higher than those without mortar. Performing the analysis by nonlinear theories, it was found that the results obtained were more coherent, mainly by Duffing’s theory that uses one parameter for stiffness and another for damping of the material.

Mechanical Feasibility Study of Pressed and Burned Red Ceramic Blocks as Structural and Sealing Masonry

“…It was set at the characteristic strength to compression of the block ( f bk ), which was 3.62 N/mm 2 , following what is defined by the Brazilian standard [33], also higher than the minimum for structural masonry. Compared to the amounts attained by other researchers who studied the PBB [4][5][6], the values found in this research presented better results as to the resistance to compression that may be associated with the pressing and the clay mass employed.…”

“…Table 2 presents the results verified as to the technological properties of the PBB after the statistical treatment. Results from the analysis of the water absorption rate (WA) indicate sufficient quality to employ the PBB as units for the sealing and structural masonry, as all the individual values and the average are within the range of limit for the standard, which is from 8 to 22% [4][5][6].…”

“…Following such a trend, structural masonry, a constructive process characterized by using walls as the main supportive structure for the building, the walls have a double role as structural support and vertical sealing. Therefore, it can contribute to being a constructive model involving further constructive rationalization, structural design and more skilled labor [ 4 , 5 , 6 , 7 , 8 ].…”

“…In the present work, it was decided to replace the extrusion step by pressing the ceramic blocks in a methodology similar to that applied to soil-cement blocks, with subsequent firing to characterize the product. Therefore, a new ceramic product replacing the extrusion process by pressing red ceramic blocks such as the process performed with soil-cement bricks was developed [ 4 , 5 , 6 , 7 , 8 ]. The pressed blocks are burned later, enabling an improvement in the resistance and durability of those materials, which were denominated as pressed and burned blocks (PBB).…”

Análise da viabilidade da utilização de resíduos do processo de fundição em areia verde na confecção de blocos solo-cimento

“…A utilização de alvenaria de blocos cerâmicos tem aumentado consideravelmente no Brasil, sendo objeto de muitos estudos nos últimos anos [5][6][7].…”