The Effect of Density on the Delicate Balance between Structural Requirements and Environmental Issues for AAC Blocks: An Experimental Investigation

Ferretti, Daniele; Michelini, Elena

doi:10.3390/su132313186

Cited by 12 publications

(5 citation statements)

References 49 publications

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“…A preliminary mechanical characterization of AAC material was performed in the initial stage of the research, whose results are discussed in Michelini et al. and Ferretti and Michelini [11, 12]. Table 1 summarizes block density, compressive and flexural tensile strength, as well as elastic modulus, which were determined on many specimens conditioned at a moisture content of 6% ± 2% according to the relevant Standards [13–16].…”

Section: Methodsmentioning

confidence: 99%

“…In the performed experimental program, 600 mm × 250 mm × 240 mm commercial AAC blocks produced by an Italian Manufacturer were used. Two different nominal densities were considered, namely TA B L E 1 Mechanical characterization of adopted AAC blocks [11,12]. Basically, the difference in material density was obtained through the addition of a different amount of aluminum powder, working as expanding agent, in the green cake during the manufacturing process.…”

Section: Aac Blocksmentioning

confidence: 99%

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Experimental characterization of AAC masonry in shear: Effect of block density, mortar, and test setup

Michelini,

Cerioni,

Riva

et al. 2023

ce papers

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The paper discusses the results of an experimental program devoted to the characterization of AAC masonry in shear, by studying the effect of different key parameters: test setup, block density, and mortar type. As for ordinary masonry assemblages, shear parameters of AAC masonry can be determined from either shear tests on triplets or diagonal compression tests. However, the extension of these methodologies to AAC blocks with low densities is not so straightforward and highlights some critical issues. To evaluate the influence of block density (and block strength) on the shear parameters and on the observed modes of failure, masonry triplet and diagonal compression tests were performed for AAC blocks characterized by two different densities (300 and 480 kg/m3). Moreover, for the higher density class, tests were repeated by also varying the mortar type. Although most of Standard codes mainly relates the shear resistance of thin‐layer masonry to the block material, the obtained results highlight that also the mortar type and the surface treatment before mortar application may have a not negligible influence on the final behavior.

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Section: Methodsmentioning

confidence: 99%

Section: Aac Blocksmentioning

confidence: 99%

Experimental characterization of AAC masonry in shear: Effect of block density, mortar, and test setup

Michelini,

Cerioni,

Riva

et al. 2023

ce papers

Self Cite

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“…In particular, not only the technological process of obtaining aerated concrete is complex, but also the technological line itself, which often consists of more expensive equipment. In this regard, the most high-quality, but at the same time the most expensive, type of cellular concrete is the so-called gas silicate or autoclaved aerated concrete [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Recipe Factors on the Structure and Properties of Non-Autoclaved Aerated Concrete of Increased Strength

et al. 2022

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At present, the load-bearing enclosing structures of buildings and structures are designed and built considering the increasing requirements for energy efficiency and energy saving of such structures. This is due to the need for a thrifty attitude to the energy consumed and the need to strive for the greening of construction and increase the energy efficiency of buildings and structures. In this regard, one of the most effective and proven building materials is cellular concrete. The purpose of this study was to study the influence of some prescription factors on the structure formation and properties of non-autoclaved aerated concrete with improved characteristics. Standard test methods were used, as well as SEM analysis of the structure of aerated concrete. Non-autoclaved aerated concrete with the replacement of part of the cement with microsilica in an amount from 4% to 16% MS showed higher strength characteristics compared to aerated concrete, where part of the cement was replaced by the addition of granulated blast-furnace slag and a complex additive. The maximum value of compressive strength was recorded for aerated concrete with 16% MS addition. The largest increase in the coefficients of constructive quality was observed in compositions of aerated concrete with the addition of silica fume from 11% to 46% compared with the control composition. The addition of microsilica makes it possible to achieve an improvement in the thermal conductivity characteristics of non-autoclaved aerated concrete (up to 10%). Replacing part of the cement with slag and complex additives does not have a significant effect on thermal conductivity. The obtained dependencies were confirmed by the analysis of the structure formation of the studied aerated concrete at the micro level. An improvement in the microstructure of aerated concrete with the addition of microsilica in comparison with samples of the control composition has been proven.

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“…In terms of cost characteristics, non-autoclaved cellular concretes significantly outperform autoclaved competitors due to the significantly reduced cost of production and manufacture of such concretes and less environmental impact. From the point of view of technological and recipe factors, there are quite a lot of studies of non-autoclaved and autoclaved aerated concrete [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. However, from the point of view of fundamental science, some gaps should be filled with additional research in the phenomenon of outgassing during the formation of the structure of non-autoclaved aerated concrete.…”

Section: Introductionmentioning

confidence: 99%

“…In other studies [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ], the authors investigated the thermal conductivity of cellular concrete and various factors affecting it. For example, in [ 18 ], the authors developed a model for predicting the thermal conductivity of non-autoclaved cellular concrete using the linearization approach.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling and Experimental Substantiation of the Gas Release Process in the Production of Non-Autoclaved Aerated Concrete

et al. 2022

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The widespread use of aerated concrete in construction has led to the emergence of many types and compositions. However, additional research should fill theoretical gaps in the phenomenon of gas release during the formation of the structure of aerated concrete. Based on theoretical analysis and experimental studies, the article proposes a mathematical model of the swelling process based on the physicochemical laws of convection and molecular diffusion of hydrogen from a mixture and the conditions of swelling, precipitation, and stabilization of the mixture. An improved method for the manufacture of aerated concrete is proposed, which consists of introducing cement pre-hydrated for 20–30 min into the composition of the aerated concrete mixture and providing improved gas-holding capacity and increased swelling of the mixture, reducing the average density of aerated concrete up to 29% and improving heat-shielding properties up to 31%. At the same time, the small dynamics of a decrease in the strength properties of aerated concrete were observed, which is confirmed by an increased structural quality factor (CSQ) of up to 13%. As a result, aerated concrete has been obtained that meets the requirements of environmental friendliness and has improved mechanical and physical characteristics. Economic efficiency is to reduce the cost of production of aerated concrete and construction in general by about 15%.

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The Effect of Density on the Delicate Balance between Structural Requirements and Environmental Issues for AAC Blocks: An Experimental Investigation

Cited by 12 publications

References 49 publications

Experimental characterization of AAC masonry in shear: Effect of block density, mortar, and test setup

Experimental characterization of AAC masonry in shear: Effect of block density, mortar, and test setup

Influence of Recipe Factors on the Structure and Properties of Non-Autoclaved Aerated Concrete of Increased Strength

Mathematical Modeling and Experimental Substantiation of the Gas Release Process in the Production of Non-Autoclaved Aerated Concrete

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