The use of response surface methodology to improve the thermal transmittance of lightweight concrete hollow bricks by FEM

Díaz, J.; Garcia-Nieto, Paulino Jose; Rabanal, Felipe Pedro Álvarez; Alonso-Martínez, Mar; Hernández, Javier Domínguez; Pérez-Bella, José M.

doi:10.1016/j.conbuildmat.2013.11.056

Cited by 54 publications

(19 citation statements)

References 11 publications

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“…In this work, the flexural strength of the structural components is studied according to the methodology described in the standard UNE EN 12390-5 [6]. In this standard, the specimens are tested under 4-point bending and the flexural strength is determined using equation (1).…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical study of the interfaces of 3D‐printed concrete using discrete element method

Valle‐Pello

Rabanal

Alonso-Martínez

et al. 2019

Materialwissenschaft Werkst

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3D concrete printing is an additive manufacturing method which reduces the time and improves the efficiency of the construction process. Structural behavior of printed elements is strongly influenced by the properties of the material and the interface surfaces. The printing process creates interface surfaces between layers in the horizontal and vertical directions. The bond strength between layers is the most critical property of printed elements. In this paper, the structural behavior of printed elements is studied using the discrete element method. The material is modelled using discrete particles with bonding between them. A new discrete model of a multilayer geometry is presented to study the behavior of the interfaces of printed concrete. The layers are made up of randomly placed particles to simulate the heterogeneous nature of concrete. The numerical model is developed to simulate the flexural behavior of multilayer specimens. A four‐point flexural test is simulated considering the interface surfaces between layers. This numerical model provides relevant results to improve the behavior of this kind of structural elements. The aim of this work is to provide a discrete element model to predict the mechanical behavior of 3D concrete printed components.

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Section: Numerical Modelmentioning

confidence: 99%

Numerical study of the interfaces of 3D‐printed concrete using discrete element method

Valle‐Pello

Rabanal

Alonso-Martínez

et al. 2019

Materialwissenschaft Werkst

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“…Costa studied how to improving thermal performance of hollow red clay brick by inserting protuberances into holes [12]. Diaz et al investigated thermal properties of light concrete hollow brick with finite-element method and the results showed that engineers could find optimal wall configuration and choose suitable building materials with the help of their comprehensive analyses [13]. Tang et al studied the effect on thermal performance of pasting 10 mm insulation around holes in external walls with the finite-volume method and the results showed that it could reduce equivalent thermal conductivity with the method that authors put forward [14].…”

Section: Figure 1 Structural Self-insulation Systemmentioning

confidence: 99%

A New Energy-Efficient Building System Based on Insulated Concrete Perforated Brick with a Sandwich

Xing

Zhang

et al. 2018

CivileJournal

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The purpose of this research is to put forward a new energy-efficient building system that can meet the energy saving requirement of 65% for public buildings in cold areas based on modified insulated concrete perforated brick with a sandwich. Modified brick was composed of three parts and three parts can be made a whole in brick manufacturing and it was called self-thermal insulation concrete perforated brick and could avoid appearance of cracks. The tesst was done to obtain thickness of EPS for modified insulated concrete perforated brick with a sandwich in order to meet the requirement of insulation. Thickness of EPS was set to to 45, 50, 55, 60, 65 and 75 mm respectively and comparative experiments were also carried out to verify the effect of insulation for modified bricks and unmodified bricks. Field tests were carried out to obtain appropriate masonry methods for modified bricks. Based on the results of analysis and discussion, then obtained: (1) Heat transfer coefficient of wall made by modified bricks was less than heat transfer coefficient of wall made by unmodified bricks when the same for thickness of EPS, it could be reduce by up to 45%; (2) When thickness of insulating layer was 65 mm, heat transfer coefficient of wall made by modified bricks could reached minimum limit 0.45 and it could meet energy saving requirement of 65% for buildings in cold area. (3) Insulating layer, located inside of the wall, could avoid appearance of cracks on surface of wall for modified bricks.

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“…These conditions become more complicated when, for some reason, their immigration goals are not met. As a result, no sense of belonging will be developed in the emigrants [13]. Security is considered as the Achilles' heel of many villages of metropolitan areas.…”

Section: Demographic and Social Problemsmentioning

confidence: 99%

“…Part of the physical development that is occurred in the past around Tehran has gradually been transferred to the city center today. Construction trends and statistics of construction licenses in these areas indicate that these areas will play an important role in the development of intermediate facility development in Tehran [13].…”

Section: Worn-out Urban Texturesmentioning

confidence: 99%

Requirements and Policies for Managing Villages in Tehran Metropolitan Area

Khorasani¹

2018

CivileJournal

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Due to the spatial proximity to and spatial-physical dependence on cities, the villages of the cities have many facilities, constraints, opportunities and challenges that are not so extreme in other villages. The main objective of this research is to identify the features of villages located in the metropolitan areas of Iran and provide strategies for managing the problems and challenges of these villages, with emphasis on the villages of Tehran Metropolitan Area. The most important policy recommendations presented in this study are: considering an efficient public transportation system for servicing these villages; a strategic look of the municipality's collection on the issue of employment of people in the city villages which are increasingly migrating into Tehran to provide their livelihoods; the issue of green space in the metropolitan villages and their perspective, which is directly available to the villagers, but the municipality of Tehran can take steps in order to improve the indices related to green space and rural landscape in city areas by adopting due measures; Development of an intermediate facility in Tehran with the aim of preventing the city from spreading to the surrounding area and the villages therein; and finally, regionalism's strategy as the most reasonable, operational and efficient management strategy for investigating and managing the challenges of Tehran metropolitan area villages.

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The use of response surface methodology to improve the thermal transmittance of lightweight concrete hollow bricks by FEM

Cited by 54 publications

References 11 publications

Numerical study of the interfaces of 3D‐printed concrete using discrete element method

Numerical study of the interfaces of 3D‐printed concrete using discrete element method

A New Energy-Efficient Building System Based on Insulated Concrete Perforated Brick with a Sandwich

Requirements and Policies for Managing Villages in Tehran Metropolitan Area

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