An experimental study on thermal conductivity of concrete

Kim, Kook-Han; Jeon, Sang-Eun; Kim, Jin-Keun; Yang, Sung-Chul

doi:10.1016/s0008-8846(02)00965-1

Cited by 498 publications

(206 citation statements)

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“…O aumento da porosidade total indica, em teoria, maior capacidade de deformação da argamassa, à medida que se aumenta o teor de finos. Kim et al (2003).…”

Section: Apresentação Análise E Discussão Dos Resultadosunclassified

“…Ela define a velocidade do fluxo de calor, e pode diminuir ou aumentar as tensões térmicas na argamassa. Kim et al (2003), estudando concreto, argamassa e pasta de cimento, identificaram sete fatores que afetam a condutividade térmica: idade, volume de agregado, quantidade de cimento, tipos de aditivos, fração de finos dos agregados, temperatura e umidade da amostra. Segundo eles, o volume de agregados e a umidade da amostra são os principais fatores que alteram a condutividade de materiais à base de cimento.…”

Section: Figura 1 -Processos De Transferência De Calor Nos Revestimentosunclassified

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Degradação de revestimentos de argamassa com finos de resíduos de concreto por ciclos térmicos

2018

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Resumoste trabalho avalia propriedades de revestimentos de argamassa com finos de concreto submetidos a envelhecimento acelerado com ciclos térmicos, utilizando-se um método de ensaio baseado na NBR 15575-4 (ABNT, 2013). As argamassas foram produzidas no traço 1:1:6 em volume (cimento, cal e areia) utilizando-se cimento CP II F-32, cal CH-I em pasta, areia de rio e finos produzidos a partir de agregado reciclado de concreto, adicionado nos teores de 2%; 4,5%; 7% e 9,5% em relação à massa da areia. Os revestimentos foram aplicados sobre substrato de cerâmica vermelha e avaliados, aos 28 dias de idade, a partir da resistência de aderência e forma de ruptura (NBR 13528 (ABNT, 2010)), da dureza superficial determinada por durômetro Shore tipo D (ASTM D 2240-5 (AMERICAN..., 2005)) e da velocidade de propagação de ondas ultrassônicas. Após, os sistemas formados pelo revestimento de argamassa aplicado sobre o substrato cerâmico foram submetidos a envelhecimento acelerado por exposição à ciclagem térmica, o que degradou os revestimentos. Todos os revestimentos apresentaram queda de dureza superficial (na ordem de 10%), diminuição da velocidade de propagação de ondas ultrassônicas (na ordem de 25%) e queda de resistência dos valores médios de aderência, na ordem de 15%. A forma de ruptura observada nos ensaios de resistência de aderência foi fortemente alterada em função do envelhecimento, sendo possível constatar que os revestimentos com 2% e 4,5% de finos apresentaram maior degradação. (NBR 13528 (ABNT, 2010)), surface hardness determined by Shore durometer type D (ASTM D 2240-5 (AMERICAN…, 2005) and the velocity of ultrasound waves. The systems formed by the rendering mortars applied on the ceramic substrate were subjected to accelerated ageing by exposure to thermal cycling, which degraded the mortars. All rendering mortars presented superficial hardness decline (in the order of 10%), lowered velocity of ultrasound waves (about 25%) and lowered bond tensile strength by about 15%. The evaluation of the rupture of the rendering mortars showed that those with 2 e 4.5% fine aggregate content suffered the greater degradation. Palavras

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“…O aumento da porosidade total indica, em teoria, maior capacidade de deformação da argamassa, à medida que se aumenta o teor de finos. Kim et al (2003).…”

Section: Apresentação Análise E Discussão Dos Resultadosunclassified

Section: Figura 1 -Processos De Transferência De Calor Nos Revestimentosunclassified

Degradação de revestimentos de argamassa com finos de resíduos de concreto por ciclos térmicos

2018

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“…The thermal conductivity of water and air are remarkably lower than that of solid materials, so that the degree of saturation and density of specimen have a great impact on the thermal conductivity values of concrete (Mindess et al 2003). Kim et al (2003) studied the seven parameters that mostly affect thermal conductivity and determined that the aggregate volume fraction and moisture condition of both cement paste and concrete specimens are the most influential factors on thermal conductivity value Thermal conductivity of quartzite, sandstone, limestone, basalt, water and air are 4.3; 3.9; 3.1; 1.4; 0.5 and 0.03 W/mK respectively.…”

Section: Thermal Conductivity (Tc) and Heatmentioning

confidence: 99%

Temperature Reduction of Concrete Pavement Using Glass Bead Materials

Pancar

Akpınar

2016

Int J Concr Struct Mater

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In this study, different proportions of glass beads used for road marking were added into the concrete samples to reduce the temperature gradient through the concrete pavement thickness. It is well known that decreasing the temperature gradient reduces the risk of thermal cracking and increases the service life of concrete pavement. The extent of alkali-silica reaction (ASR) produced with partial replacement of fine aggregate by glass bead was investigated and compressive strength of concrete samples with different proportion of glass bead in their mix designs were measured in this study. Ideal results were obtained with less than 0.850 mm diameter size glass beads were used (19 % by total weight of aggregate) for C30/37 class concrete. Top and bottom surface temperatures of two different C30/37 strength class concrete slabs with and without glass beads were measured. It was identified that, using glass bead in concrete mix design, reduces the temperature differences between top and bottom surfaces of concrete pavement. The study presented herein provides important results on the necessity of regulating concrete road mix design specifications according to regions and climates to reduce the temperature gradient values which are very important in concrete road design.

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“…측정원리는 Figure 1에 나타낸 바와 같이 두께 (m)의 균질한 재료에 양단의 온도가 각각 [13,14,15]. 키워드 : 대나무 활성탄, 시멘트 모르타르, 강도, 열전도율, 밀도…”

Section: 실험방법unclassified

Development of Eco Cementitious Building Finishing Materials Modified with Bamboo Charcoal

Park¹,

Kwon²

2011

Journal of the Korea Institute of Building Construction

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Bamboo is representing environmentally friendly building finishing materials as proven in the former researches. The purpose of this study is to evaluate the application properties of cementitious materials modified with bamboo charcoal as building finish materials. Flow test in fresh condition was conducted to assess the workability. Compressive and bending strength were measured after harding. As the thermal properties, thermal conductivity and density were measured. The properties were surpassing over them in case of using the pine charcoal in every tests. The thermal conductivity of them increased with the modified ratio. After the modified ratio 50%, the thermal conductivity decreased. Insolation and absorption performance is due to the lower density by modification of bamboo charcoal.

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An experimental study on thermal conductivity of concrete

Cited by 498 publications

References 0 publications

Degradação de revestimentos de argamassa com finos de resíduos de concreto por ciclos térmicos

Degradação de revestimentos de argamassa com finos de resíduos de concreto por ciclos térmicos

Temperature Reduction of Concrete Pavement Using Glass Bead Materials

Development of Eco Cementitious Building Finishing Materials Modified with Bamboo Charcoal

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