Experimental Determination of Thermal Conductivity and Diffusivity of New Building Insulating Materials

Boulaoued, Ines; Amara, Ines; Mhimid, Abdallah

doi:10.18280/ijht.340224

Cited by 19 publications

(14 citation statements)

References 10 publications

(10 reference statements)

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“…Moreover, 3 ′ K increases with the SS content. The main reason for the increase is that the number of hydration reaction products is reduced at all stages of the reaction because of the increase in SS content, resulting in larger porosity in the system [9], lower resistance to ion diffusion, and delayed initiation of the diffusion mechanism.…”

Section: K Andmentioning

confidence: 92%

“…Over the years, the rapid development of iron and steel metallurgy has aggravated the resource consumption, energy consumption, and waste discharge problems [1][2][3]. By conducting in-depth investigations in the field of industrial solid waste, researchers determined the pozzolanic activity of steel slag (SS), slag, tailings and other kinds of industrial solid waste, and used their findings to prepare building materials.…”

Section: Introductionmentioning

confidence: 99%

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Early Hydration Kinetics of Cementitious Materials Containing Different Steel Slag Powder Contents

Cui¹,

Wen²,

Ren³

2016

IJHT

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This study measures the hydration heat emission rate and quantity of cementitious materials containing 10%, 20%, 30% and 40% of steel slag (SS) powder at 298 K, calculates the kinetic parameters such as the reaction rate constant k, the degree of hydration α, and the order of reaction n according to the Krstulovic-Dabic hydration kinetics model, and discusses the influence of SS content over the hydration reaction and mechanism of cementitious materials. Results show that, with the increase in SS content, the hydration heat emission quantity decreases. The hydration process of cementitious materials containing different SS contents involves three stages, namely, nucleation and crystal growth (NG), interactions at phase boundaries (I), and diffusion (D). The Krstulovic-Dabic model can effectively simulate the hydration process of SS-based cementitious materials prepared with all-solid wastes. With the increase in the SS content, the hydration reaction induction period prolonged and the generation of hydration products is slowed down. At the early stage of hydration, NG is the controlling factor, which is gradually replaced by I as the hydration degree increases, and eventually by D when the reaction reaches the final stage.

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Section: K Andmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Early Hydration Kinetics of Cementitious Materials Containing Different Steel Slag Powder Contents

Cui¹,

Wen²,

Ren³

2016

IJHT

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“…The researchers are increasingly engaged in the study and characterization of NM, widespread and easily available: their behavior with respect to thermal stresses, their strength and durability within cementitious composite materials as fibers, are being investigated to allow use improving the behavior and mechanical energy as a result of external stresses [5].…”

Section: Introductionmentioning

confidence: 99%

Investigations on thermal and mechanical properties of cement mortar with reed and straw fibers

Cardinale¹,

Arleo²,

Bernardo³

et al. 2017

IJHT

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Building insulation is commonly realized using materials obtained from petrochemicals or from natural sources processed with high energy consumptions, causing significant harmful effects on the environment. The "sustainability" applied to building design has encouraged many researches to develop thermal and acoustic insulating materials using natural or recycled materials. Many natural materials were already used in ancient times to thermally insulate the dwellings and to give resistance: straw and reed are some representative examples. Aim of this paper is to evaluate the influence of reed stems and straw on the thermal and mechanical performances of cement. To reach this, several types of mixes were prepared: a specimen as reference mix without any addition of fibers and some more specimens with reed only, with straw only, and finally the combination between straw and reed in different percentage. The tests were performed to determine the thermal conductivity, the compressive and flexural strength of the cement mortar panels. The results showed that straw, if combined with reed stems, could be considered as a valid reinforcement in a cementitious matrix characterized by enhanced thermal insulation and good mechanical properties. ENEA researchers have also applied a statistical method to the obtained test results in order to develop a predictive model of compression and flexural behavior of fiber-reinforced specimens with different percentages of organic fibers in the mixture cementitious.

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“…Sustainable district heating serving the public buildings and the improvement of the materials used for construction [10] can have significant effect on reducing of the GHG emission and the air pollution [11]. A centralized local thermal energy system, which can produce hot and cold fluid, and then distribute them throughout the community, has a significant potential to contribute to solving society's energy challenges [12].…”

Section: Introductionmentioning

confidence: 99%

Energy Analysis of a Small Geothermal District Heating System in Southern Italy

Carotenuto¹,

Luca²,

Fabozzi³

et al. 2016

IJHT

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Small and medium size district heating networks have seen some spread over the last two decades, especially in cities which are not supplied by natural gas grids. In this paper, the authors investigate the energetic feasibility of a small district heating network feeding two schools in a city of Southern Italy (Mondragone). In particular, the district heating is powered by a low-temperature geothermal fluid pumped from a well located 2.1 km away from the city center. Geothermal fluid has a temperature of 34°C and a flow rate of 6 l/s. The buildings have been rehabilitated by an energy point of view and are equipped of low-temperature fan-coils in order to ensure their compatibility with the 4 th generation district heating system. Energy analysis were conducted through the implementation of transient simulation model in TRNSYS environment. The feasibility of two configurations of the system is compared: the first, with one heat pump installed nearby the geothermal well feeding the grid, and the second one with the heat pumps installed in each building substation. Transient simulations results show that the first configuration is energetically less efficient than the second one due to the high thermal losses (55% of the total consumption) of the district supply pipes.

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Experimental Determination of Thermal Conductivity and Diffusivity of New Building Insulating Materials

Cited by 19 publications

References 10 publications

Early Hydration Kinetics of Cementitious Materials Containing Different Steel Slag Powder Contents

Early Hydration Kinetics of Cementitious Materials Containing Different Steel Slag Powder Contents

Investigations on thermal and mechanical properties of cement mortar with reed and straw fibers

Energy Analysis of a Small Geothermal District Heating System in Southern Italy

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