New look at mathematical relationships among physical properties of brick products

Šveda, Mikuláš

doi:10.1179/096797800680910

Cited by 16 publications

(6 citation statements)

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“…When it is sought to decrease brick thermal conductivity by raising porosity, the ensuing reduction in mechanical strength needs to be taken into account, thus also making it of interest to understand how brick composition and microstructure influence mechanical strength [12,13]. This issue has been addressed in few studies, which report that the microstructures formed by small pores provide greater mechanical strength [14].…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of traditional ceramics. Part I: Influence of bulk density and firing temperature

García-Ten

Orts

Saburit

et al. 2010

Ceramics International

113

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Section: Introductionmentioning

confidence: 99%

Thermal conductivity of traditional ceramics. Part I: Influence of bulk density and firing temperature

García-Ten

Orts

Saburit

et al. 2010

Ceramics International

113

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“…The porosity of the fired clay body affects not only its thermal conductivity (Erker, 2002) but also other properties, such as water absorption (Kato et al, 2008), bulk density (Ten et al, 2010a), and compressive strength (Liu, 1997). Their relationships can be expressed using mathematical functions (Sˇveda, 2000b(Sˇveda, , 2006. For example, the relationship between porosity and the fired clay body thermal conductivity can be expressed using the exponential function.…”

Section: Introductionmentioning

confidence: 99%

Pore-size distribution effects on the thermal conductivity of the fired clay body from lightweight bricks

Šveda

Janík

Pavlı́k

et al. 2016

Journal of Building Physics

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This study investigated the effects of three pore-forming agents on the properties of the fired clay body applied in the production of lightweight bricks for the building envelopes. Test samples were made from clay raw material already containing two combustible pore-forming agents (sawdust and cellulose sludge). A part of this research was focused on studying the influence of adding two combustible pore-forming agents (molasses and cornstarch) and a chemical additive Vuppor to the claw raw material. Testing of the material properties showed that although the three samples had almost the same pore volume, their thermal conductivities varied. These findings led to an important conclusion. The pore size of 1–200 µm (filled with not only air but also biomass ash) reduced the thermal conductivity, and conversely, an increase in the small pore size less than 1 µm increased the thermal conductivity of the fired clay body.

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“…However, there is no sign of the presence of calcite and dolomite phases in the presently analyzed three brick samples and presence of mullite and residual forms of quart and cristobite indicated that these a century old brick samples should have good mechanical and physico-sintering properties. It is considered that the mechanical strength of the ceramic bodies can attribute to the formation of mullite, residual quartz content and its particle size, and amount of glassy phases present in it [24]; [25].…”

Section: Figure2 Xrd Patterns Of Clay Brick-p1mentioning

confidence: 99%

Mineralogical Study of Historical Bricks of Patan, Nepal Using XRD and FTIR Analysis

Shrestha¹

2017

International Journal of Advanced Research in Chemical Science

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Bricks, a prevalent building material, are used extensively in the construction industry. India and the United States, for example, consume 20 billion and 9 billion bricks each year, respectively [1]; [2]. The annual worldwide production of bricks is about 1.391 trillion units and demand for bricks is expected to continue rising [3]. With increasing demands of the construction industry, bricks quality and cost become more important day by day. Clay bricks, made from clays, silica, fluxes, coloring and other raw materials are one of the simplest examples of the traditional ceramic body. They are prepared by grinding, sieving, mixing, moistening, shaped by pressing, casting or other processes, usually at room temperature. Then they are dried and subsequently fired at a high temperature. Bricks are widely used in buildings, foundation walls and boundary. Depending on the degree of firing at high temperature, the chemical/mineralogical, physico-chemical, mechanical and thermal properties of the ceramic bodies are varied. All these properties of the clay ceramic bricks are interrelated to each other. Different clay minerals are the principal raw materials which have a large effect on their technological properties for manufacturing various clay bricks [4]. Content of water and dispersion of the solid phase of the clays used for the production of the clay bricks should be optimized taking into account subsequent drying and sintering to ensure the maximally high parameters of the brick product. The chemical composition of the clay raw materials is one of the main indicators for selection of a component for the final mixture. Al 2 O 3 has the largest effect on the properties of ceramic articles. As the Al 2 O 3 content increases the refractoriness and mechanical strength of the material increases. On the other hand, SiO 2 decreases the shrinkage and it also decreases refractoriness of the ceramic products. Varieties of feldspars, sodium, potassium, calcium, magnesium, iron and titanium oxides are strong fluxes, which decrease the viscosity of the liquid phase of the ceramic products. High Fe 2 O 3 and TiO 2 content of clay reduce the quality of the product but offer higher plasticity and mechanical strength. On the other hand, the amounts of fluxing oxides show a direct correlation with bulk density and an inverse relation with water absorption of the fired clay ceramic bodies. Important source of these fluxing oxides are different feldspars and the presence of high concentration of fluxing components in the clay ceramic body permit a lowering of its firing/sintering temperature [5]; [6]; [7]; [8]. It was investigated the effect of the particle size distribution of feldspar on the formation of pores in the

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New look at mathematical relationships among physical properties of brick products

Cited by 16 publications

References 0 publications

Thermal conductivity of traditional ceramics. Part I: Influence of bulk density and firing temperature

Thermal conductivity of traditional ceramics. Part I: Influence of bulk density and firing temperature

Pore-size distribution effects on the thermal conductivity of the fired clay body from lightweight bricks

Mineralogical Study of Historical Bricks of Patan, Nepal Using XRD and FTIR Analysis

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