Mechanical and thermophysical properties of lightweight aggregate concretes

Oktay, Hasan; Yumrutaş, Recep; Abdullah, Amir

doi:10.1016/j.conbuildmat.2015.08.015

Cited by 136 publications

(91 citation statements)

References 21 publications

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“…It can be seen that volumetric heat capacity of blocks with 20% of binder exhibits the highest value (1402kJ/m3.K) compared to that of control and blocks with 30% of binder (1328kJ/m 3 .K and 1299kJ/m 3 .K respectively). The high value is considered as a desirable property due to the associated ability to store heat and it combines the specific heat capacity with material's density in which influenced by the content and the types of materials used [26,27]. Therefore, it can be concluded that the use of a high content of elaborated binder can improve mechanical strength but at the same time deteriorate the thermal insulation of ecofriendly bricks.…”

Section: Cmss-2017mentioning

confidence: 99%

Ecofriendly bricks elaborated from coal waste of Moroccan Jerrada Mining

et al. 2018

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Abstract. Solid waste generated during mining is one of the major environmental problems associated with this industrial activity. The best solution to overcome the environmental impact of this waste is to find recycling facilities in mass-produced products that can absorb the large quantities of these available byproducts. The present study shows the feasibility of using the coal waste of Moroccan Jerrada mining in the production of ecological brick. The first step consists of consecutive stages of crushing, grinding and heating at 650°C of the coal waste with a small amount of lime in order to promote the reactive products of elaborated binders. The second step of the process consists of mixing treated coal waste with a small amount of marble dust, sand, gravel, and water, then pressed and dried at room temperature to manufacture a laboratory ecofriendly bricks. The mechanical strength and thermal conductivity are investigated.

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Section: Cmss-2017mentioning

confidence: 99%

Ecofriendly bricks elaborated from coal waste of Moroccan Jerrada Mining

et al. 2018

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“…Bu amaçla farklı karışım tiplerine sahip, %10, %20, %30, %40 ve %50 oranlarında hafif agrega ve katkı maddeleri kullanılarak; toplamda 102 adet olmak üzere normal beton (NB), hava sürüklenmiş beton (HSB), pomza betonu (PB), genleşmiş perlit betonu (GPB) ve lastik betonu (LB) üretilmiştir. Malzemelerin kimyasal ve fiziksel özelikleri ve ayrıca numunelerin hazırlanması Kaynak [15]'te ayrıntılı olarak açıklanmıştır. Üretilen numunelerin; basma dayanımı (MPa), yoğunluk (kg/m 3 ), gözeneklilik (%), su emme kapasitesi (%) gibi mekanik özellikleri ASTM standartlarına uygun olarak tespit edilmiştir (ASTM C39, C138 ve C948).…”

Section: Deneysel çAlışmaunclassified

Bina Duvarlarının Termofiziksel Özellikleri Arasındaki İlişkileri ile Bu Özelliklerin Dinamik Isıl Karakterlerine Etkilerinin Araştırılması

Oktay

Yıldırım

Yumrutaş

2018

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Anahtar KelimelerBina duvarları, Beton, Termofiziksel özellikler, Zaman gecikmesi, Sönüm oranı, CFFT Özet: Binaların ısıtılması ve soğutulması için tüketilen enerjinin artmasıyla birlikte ısıl performansı yüksek olan inşaat malzemelerinin geliştirilmesine ihtiyaç duyulmuştur. Bu malzemelerin ısıl performansı ise doğrudan termofiziksel özelliklere bağlı olarak değişmektedir. Her ne kadar literatürde her bir termofiziksel özelliğin dinamik ısıl karakterleri olan; faz kayması (TL) ve sönüm oranına (DF) etkisi incelense de, bu özelliklerin birbiri arasındaki ilişkiler göz ardı edilmiştir. Bu çalışmada ise; her bir termofiziksel özelliğin arasındaki ilişki deneysel yöntemler ile elde edilerek, bu özelliklerin DF ve TL üzerindeki etkileri gerçekçi olarak incelenmiştir. Bu yüzden farklı bileşimli 102 beton duvar numunesi üretilerek, termofiziksel özellikleri ASTM ve EN standartlarına göre ölçülmüş ve aralarındaki ilişkiler denklemlerle tanımlanmıştır. Termofiziksel özelliklerin yapıların ısıl karakterlere olan etkisini incelemek amacıyla, analitik çözüm kullanılarak MATLAB tabanlı bir bilgisayar program hazırlanmış ve elde edilen sonuçlar irdelenmiştir. Sonuç olarak, bu yapılan çalışma sayesinde herhangi bir termofiziksel özelliği belli olan bir bina duvar veya tavan malzemelerinin TL ve DF değerleri kolaylıkla bulunabilmektedir. Investigation of Relationships Between Thermophysical Properties of Building Walls and Their Effects on Dynamic Thermal Characteristics KeywordsBuilding walls, Concrete, Thermophysical properties, Time lag, Decrement factor, CFFT Abstract:The growing concern about energy consumption of heating and cooling of buildings has led to a demand for improved thermal performances of building materials. Thermal performance of building structures strictly depend on thermophysical properties of the structures. Many investigations are presented in literature arguing to find the influence of each thermophysical property on time lag (TL) and decrement factor (DF) by keeping the other properties constant. In this context, the purpose of this study is to investigate the effect of each property on heat gain utilizing relationships between the measurement values of thermophysical properties of building materials. Therefore, 102 new concrete wall samples were produced, their thermophysical properties were tested in accordance with ASTM and EN standards, and expressions related between these properties are obtained. By using those expressions, TL and DF values for each building structure are computed from the solution of transient heat transfer problem by applying Complex Finite Fourier Transform (CFFT) technique. A program based on the solution in MATLAB is prepared, and the results are discussed. Consequently, if one of the thermophysical properties of a building wall or roof materials is known, TL and DF can be calculated easily.

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“…In a previous study [20], the experimental research aimed to produce different wall types to establish the relationships between the thermophysical properties by performing a set of consistent tests. In this regard, the mixtures were produced as normal concrete (NC), air-entrained concrete (AEC), pumice concrete (PC), expanded perlite concrete (EPC), and rubberized concrete (RC) and the numbers 10, 20, 30, 40 and 50 show the percentage of replacement.…”

Section: A Materials and Test Proceduresmentioning

confidence: 99%

“…In this regard, the mixtures were produced as normal concrete (NC), air-entrained concrete (AEC), pumice concrete (PC), expanded perlite concrete (EPC), and rubberized concrete (RC) and the numbers 10, 20, 30, 40 and 50 show the percentage of replacement. The chemical composition and physical properties of the materials, as well as preparation of concrete mixtures for this study, were explained in detail [20]. Thermophysical and mechanical tests were carried out to establish the physical properties of the wall samples, including density, thermal conductivity, specific heat and thermal diffusivity, incorporating PC, EPC and RC.…”

Section: A Materials and Test Proceduresmentioning

confidence: 99%

“…The thermophysical properties of a building wall or roof material are strongly affected by microstructure, mineralogical composition, proportion, supplementary materials, moisture content, and porosity [19]. Besides, many investigations have indicated that there is a direct relationship among the specific heat, thermal conductivity, and thermal diffusivity of the building materials [20][21][22][23]. Although many researchers have attempted to investigate the effect of the each thermophysical properties of opaque components on their dynamic thermal characteristics, the current practices ignore the relationship between those properties.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Experimental and Literature models for the Heat Gain through the Walls in terms of the Effect of Thermophysical Properties

2017

May 22-24, 2017 Kuala Lumpur (Malaysia) ICLTET-2017, ACBES-2017

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Abstract-In literature, many investigations are presented arguing to find the influence of each thermophysical property of building components on the dynamic thermal characteristics, while the properties have been assumed as independent of each other. In this study, the effect of each property on heat gain value utilising relationships between the measurement values of thermophysical properties of building materials. In the previous study, 102 new concrete wall samples were produced and their thermophysical properties were tested in accordance with ASTM and EN standards. In this study, the heat gain values through the structures are computed from the solution of the problem by Complex Finite Fourier Transform (CFFT) technique by using both the obtained those expressions and assumptions proposed from the literature and comparisons have been made. The results show that the assumptions are not realistic in a significant number of cases.

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Mechanical and thermophysical properties of lightweight aggregate concretes

Cited by 136 publications

References 21 publications

Ecofriendly bricks elaborated from coal waste of Moroccan Jerrada Mining

Ecofriendly bricks elaborated from coal waste of Moroccan Jerrada Mining

Bina Duvarlarının Termofiziksel Özellikleri Arasındaki İlişkileri ile Bu Özelliklerin Dinamik Isıl Karakterlerine Etkilerinin Araştırılması

Comparison of Experimental and Literature models for the Heat Gain through the Walls in terms of the Effect of Thermophysical Properties

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