scholarly journals Influence of ceramic block geometry and mortar coating on the sound reduction of walls

2021 ◽  
Vol 21 (2) ◽  
pp. 195-207
Author(s):  
Maria Fernanda de Oliveira ◽  
Sérgio Klippel Filho ◽  
Fernanda Pacheco ◽  
Jorge Viçoso Patrício ◽  
Bernardo Fonseca Tutikian

Abstract The materials that compose a construction system influence directly the acoustic performance of buildings.In masonry systems, through experiments, the geometry of the blocks and the types of coating were perceived as fundamental factors on the acoustic performance of walls. Therefore, this study intends to enrich the database and promote analysis for the civil construction industry by evaluating the airborne sound reduction of masonry walls composed by ceramic blocks with and without mortar coating. Accordingly, different partitions made of different ceramic blocks were built to determine the performance discrepancies in the partitions’ behavior due to physical characteristics and the influence of the mortar coating. These analyses were made in laboratory. As a result, without coating, the highest sound reduction was observed in the samples with more bulk mass and higher Aliq/At ratio (relationship between the net and gross areas of the ceramic blocks). Then, with the mortar coating, the coating improved the sound reduction. Moreover, the bulk mass was the most influential characteristic in comparison to the Aliq/At ratio, even though the best results were obtained in the samples with higher Aliq/At ratios.

2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Pedro Henrique Gonçalves ◽  
Michele Tereza Marques Carvalho

RESUMO:  Após um longo período de debates, entrou em vigor a Norma de Desempenho - NBR 15.575 (ABNT,2013), instituindo níveis de desempenho mínimo ao longo da vida útil de uma edificação. Em relação ao desempenho acústico a norma determina que a edificação habitacional deva apresentar isolamento acústico adequado das vedações externas e isolamento acústico adequado entre áreas comuns e privativas. Para que os critérios de desempenho acústico exigidos sejam cumpridos, com o edifício acabado, é necessário um estudo de isolamento na fase de projeto e a posterior comprovação desse desempenho quando a edificação já estiver concluída. Este trabalho buscou determinar o isolamento acústico de paredes de vedação de um dormitório em um projeto habitacional que será localizado em Anápolis/GO, prevendo sua composição por alvenaria de bloco cerâmico. Para tanto, foi feita a predição por método de cálculo definida no Norma ISO 12.354-1 (EN, 2000), através do qual foram determinados os índices de redução sonoros ponderados e a Diferença Padronizada de Nível Ponderada dos componentes e sistemas construtivos das paredes de vedação. Além disso, foram recalculados os atenuantes sonoros de quatro sistemas construtivos dos DATec´s. Os resultados obtidos mostraram que, sobretudo as paredes de vedação interna, não atingiram o desempenho acústico mínimo previsto na norma. Constatou-se ainda que determinados componentes diminuem consideravelmente o isolamento acústico das paredes de vedação. Comprovou-se, também, a importância da avaliação do desempenho acústico das edificações na etapa de projeto.ABSTRACT: After a long period of discussions, the Performance Standard - NBR 15.575 (ABNT,2013) entered into force, instituting minimum performance levels throughout the life of a building. Regarding the acoustic performance, the standard establishes that the housing construction must present adequate acoustic insulation of the external fences and adequate acoustic insulation between common and private areas. In order for the required acoustic performance criteria to be met, with the finished building, an isolation study is required at the design stage and subsequent proof of this performance when the building is completed. This paper aimed to determine the acoustic insulation of the walls of a dormitory in a housing project that will be located in Anápolis / GO, predicting its composition by masonry of ceramic block. In order to do so, the calculation method defined in Standard ISO 12.354-1 (EN, 2000) was used to determine the weighted sound reduction indices and the Standardized Weighted Level Difference of the components and construction systems of the walls. In addition, the sound attenuators of four DATec's construction systems were recalculated. The results showed that, especially the internal sealing walls, did not reach the minimum acoustic performance predicted in the standard. It has further been found that certain components considerably decrease the acoustic insulation of the sealing walls. It was also verified the importance of evaluating the acoustic performance of the buildings in the design stage.


2021 ◽  
Vol 2118 (1) ◽  
pp. 012007
Author(s):  
M S Narváez-Ortega ◽  
J Sánchez-Molina ◽  
J V Sánchez-Zúñiga

Abstract In Norte de Santander, Colombia, there is a ceramic cluster made up of 59 companies dedicated to the production of construction materials derived from clay, a vernacular material with a wide extraction potential in the region. Fired clay products in different hollow block presentations represent 15% of industrial production, these construction pieces are low cost and show a high demand in the local masonry market, therefore, their thermo-physical characteristics largely build the thermal envelope of “Cucuteña”. This research comparatively evaluates the thermal behavior of four types of ceramic blocks with different perforations, applying the finite element method in thermal simulations that consider a conductivity of 0.407 W/m°C in the ceramic to establish the influence of the shape on the temperature distribution and heat flow profiles of each piece subjected to environmental conditions of a warm semi-arid climate, with average maximum temperatures of 33 °C and an average maximum solar radiation of 796.8 Wh/m2 under extreme climatic conditions in the city of San Jose de Cúcuta, Colombia. The results of the study allow identifying the ceramic block of 6 rectangular holes as the product that, due to its physical characteristics, presents a better alternative to be applied in constructions that seek thermal efficiency.


2014 ◽  
Vol 606 ◽  
pp. 95-98
Author(s):  
Lukasz Sadowski

Prefabricated power support structure foundations are made in prefabrication plants where concrete is laid in layers in moulds. The quality of the prefabricated units depends mainly on proper concrete mixture compaction, which is usually effected by means of immersion vibrators. It happens that when the vibrator is withdrawn too quickly, defects, in the form of, e.g., air voids and zones of insufficiently vibrated concrete, appear. Modern non-destructive acoustic techniques, which in recent years have been increasingly commonly used in the construction industry, are highly suitable for testing concrete elements, particularly prefabricated concrete units. The non-destructive impact-echo technique is particularly useful for determining defect location depth and for locating defective areas.


2016 ◽  
Vol 869 ◽  
pp. 112-115 ◽  
Author(s):  
Francisca Pereira de Araújo ◽  
Edson Cavalcanti Silva Filho ◽  
João Sammy Nery de Souza ◽  
Josy Anteveli Osajima ◽  
Marcelo Barbosa Furtini

Soil-cement bricks are good examples of environmentally friendly products. This brick is the combination of soil with compacted cement with no combustion in its production. In this work the physical chemical characteristics of the soil from Piaui for producing this material were investigated. Samples of the soil were collected in three potteries from the county of Bom Jesus and pH analysis were carried out, as well as the rate of organic matter, texture, particle density, limits of liquidity and plasticity rates. The results have shown that the soils have acid tones (pH 5,49 a 6,11), which can be neutralized by adding cement, and organic matter percentages up to 1%. The samples have shown predominantly clay-rich textures with adequate plasticity limits, however, values of liquidity limits and particle density above recommended. Altogether, these soils tend to present viability concerning soil-cement brick production, provided that corrections with additives are made in order to minimize this effect.


2018 ◽  
Vol 15 (3) ◽  
pp. 321-336 ◽  
Author(s):  
Rafael Carlos ◽  
Daniel C. Amaral ◽  
Mauro Caetano

Purpose Roadmapping has been used as an approach to support market, product and technology-integrated planning, resulting in a document commonly known as a roadmap. Despite the gains made in relation to the technique, recent studies indicate that most users leave or have difficulties in sustaining the process (i.e. maintaining the updated roadmaps). This paper aims to present a framework for continuous roadmap updating that incorporates principles from agile management fields. Design/methodology/approach The framework was developed through action research in a manufacturing firm in the construction industry. Findings The results demonstrate a positive impact on the degree of continuous information monitoring, roadmap credibility and use of the roadmap during innovation strategy decisions. Originality/value The key contribution of this framework is the demonstration of a new strategy for carrying out the maps in which information is internalized by the organization itself, using agile teams, without commissioned specialists and as part of the work standards.


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