scholarly journals Properties of a New Insulation Material Glass Bubble in Geopolymer Concrete

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 809
Author(s):  
Noor Fifinatasha Shahedan ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Norsuria Mahmed ◽  
Andri Kusbiantoro ◽  
Sam Tammas-Williams ◽  
...  
Keyword(s):  
Geopolymer Concrete ◽  
Insulation Material ◽  
Insulating Material ◽  
Thermal Insulating ◽  
Precursor Material ◽  
Analytical Research ◽  
Alkaline Activator ◽  
Bearing Structure ◽  
Insulating Properties ◽  
Glass Bubble

This paper details analytical research results into a novel geopolymer concrete embedded with glass bubble as its thermal insulating material, fly ash as its precursor material, and a combination of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as its alkaline activator to form a geopolymer system. The workability, density, compressive strength (per curing days), and water absorption of the sample loaded at 10% glass bubble (loading level determined to satisfy the minimum strength requirement of a load-bearing structure) were 70 mm, 2165 kg/m3, 52.58 MPa (28 days), 54.92 MPa (60 days), and 65.25 MPa (90 days), and 3.73 %, respectively. The thermal conductivity for geopolymer concrete decreased from 1.47 to 1.19 W/mK, while the thermal diffusivity decreased from 1.88 to 1.02 mm2/s due to increased specific heat from 0.96 to 1.73 MJ/m3K. The improved physicomechanical and thermal (insulating) properties resulting from embedding a glass bubble as an insulating material into geopolymer concrete resulted in a viable composite for use in the construction industry.

Investigation of mechanical and thermal insulating properties of wool fibres in epoxy composites

2020 ◽  
pp. 096739112097138
Author(s):  
Dionisis Semitekolos ◽  
Katerina Pardou ◽  
Pantelitsa Georgiou ◽  
Panagiota Koutsouli ◽  
Iosif Bizelis ◽  
...  
Keyword(s):  
Epoxy Composites ◽  
Wool Fibre ◽  
Hot Press ◽  
Insulating Material ◽  
Thermal Insulating ◽  
Coefficient Of Thermal Conductivity ◽  
Strength Tests ◽  
Press Method ◽  
Insulating Properties ◽  
Sheep Wool

The purpose of this study is to investigate a novel exploitation approach for a mass livestock byproduct, namely sheep wool fibres. In order to fulfil this aim, wool fibre toughened epoxy composites with an amount of 2.4, 4.1 and 5.7 phr were prepared via the hot press method. Initially, mechanical assessment of the composites was executed, in order to evaluate their mechanical integrity. The flexural and shear strength tests showed that the wool fibre-epoxy composites maintain their mechanical properties for up to 4.1 phr and no degradation is detected. Subsequently, the thermal properties were tested. Thermogravimetric analysis proved that adding wool fibres as toughening agent in epoxy matrix can prolong the endurance of the material while reaching high temperatures. The coefficient of thermal conductivity decreased by 30% compared to neat epoxy, something that is also confirmed through simulation, proving that wool fibre-epoxy composites can be considered as a promising insulating material, while exploiting a natural waste.

Study on the Vacuum Insulation Panel Protected by Silicone Rubber

2014 ◽  
Vol 541-542 ◽  
pp. 113-117
Author(s):  
Lu Wang ◽  
Zhao Feng Chen ◽  
Cao Wu ◽  
Sheng Nan Guan
Keyword(s):  
Silicone Rubber ◽  
Insulation Material ◽  
Molding Process ◽  
Rubber Layer ◽  
Composite Sandwich ◽  
Vacuum Insulation ◽  
Thermal Insulating ◽  
Pipe Insulation ◽  
Insulating Properties ◽  
Vacuum Insulation Panel

This paper uses molding process to prepare a new kind of pipe insulation material, called silicone rubber-vacuum insulation panel (SR-VIP), which consists of a silicone rubber layer, a VIP layer and silicone rubber layer, making the composite sandwich structure. The thermal consuctivity of the composite is as low as 0.005 W/m·K. The tensile strength, tear strength, compression strength and compression set of the composite are 7.8MPa, 22N/mm, 65Mpa, 25%, respectively. Compared with traditional foam insulation materials, the composite possesses superior thermal insulating properties and mechanical properties.

Possibility of Using the Technical Hemp as a Filling Component in External Thermal-Insulation Composite Systems

2012 ◽  
Vol 587 ◽  
pp. 47-51 ◽  
Author(s):  
Šárka Keprdová ◽  
Jiří Bydžovský
Keyword(s):  
Building Materials ◽  
Acoustic Properties ◽  
Filling Material ◽  
Insulation Material ◽  
Excellent Performance ◽  
Insulating Material ◽  
Environmentally Sustainable ◽  
Composite Systems ◽  
Natural Composite ◽  
Insulating Properties

Combining air or hydraulic binders with hemp shives, we can gain a set of new building materials. These products achieve excellent performance characteristics for durable, environmentally sustainable buildings. Being together, these products create natural composite building material that can be used to create insulating elements for walls, floors and roofs and also to create excellent thermal and acoustic properties of the buildings. Hemp insulation material is created by connection of technical hemp shives with a binder consisting of cement and calcium hydroxide. The production process may vary depending on whether the hemp is mineralized or not. It can be generally said that dry components should be mixed at first (binder and shives) and then water should be added. During the production, all components of insulating material must be perfectly mixed. The paper deals with the proposal and testing of new hemp insulation composites. Tests of the hemp insulation described in this paper are not typical representatives of the tests of insulation materials. Due to the doubts about the insulating properties of the proposed material, there was testing carried out in such the ways as if it was the filling material based on lightweight concretes.

Hempcrete - Cement Composite with Natural Fibres

2015 ◽  
Vol 1124 ◽  
pp. 130-134 ◽  
Author(s):  
Karel Mikulica ◽  
Rudolf Hela
Keyword(s):  
Building Materials ◽  
Cement Composite ◽  
Sound Insulation ◽  
Hemp Fiber ◽  
Insulating Material ◽  
Bicomponent Fibers ◽  
Thermal Insulating ◽  
Hydrate Cement ◽  
Soda Solution ◽  
Bearing Structure

The paper describes use of hemp boon as a natural organic filler for building materials, especially concrete designed as heat - insulating filler material around the load-bearing structure of wooden buildings. In constructions, hemp has been used in the form of mats made of hemp fiber, with the addition of bonding bicomponent fibers and soda solution for protection against burning and rots. Mats are formed by pneumatic fleece, they are subsequently thermally treated and then cut to the desired dimensions. Calcium-hemp building material is a revolutionary construction and thermal insulating material which can be used for building the entire building, bricks or other insulation are not necessary. The trend is spreading across Europe from France, where the mixture of boon and lime was used in the 16thand 17thcenturies for the construction of timber-framed houses. Although there are hundreds of buildings made from hempcrete in Europe, its use in our country develops very slowly. Concrete is a mixture of hemp boon, lime hydrate, cement and water. It is a recyclable material that offers high thermal and sound insulation. The biggest advantage is undoubtedly the speed of construction, namely hemp concrete hardens very quickly.

Thermophysical Properties of Metakaolin Geopolymers Based on Na2SiO3/NaOH Ratio

2018 ◽  
Vol 280 ◽  
pp. 487-493 ◽  
Author(s):  
Ain Jaya Nur ◽  
Yun Ming Liew ◽  
Mohd Mustafa Abdullah Al Bakri ◽  
Cheng Yong Heah
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Diffusivity ◽  
Specific Heat ◽  
Sodium Silicate ◽  
Thermophysical Properties ◽  
Insulating Material ◽  
Thermal Insulating ◽  
High Specific Heat ◽  
Alkaline Activator

In the present work, the effect of different sodium silicate-to-sodium hydroxide ratio on the physical, mechanical and thermophysical properties of metakaolin geopolymers (MkGPs) was investigated. Geopolymers were prepared by activating the metakaolin with a mixture of NaOH and sodium silicate (Na2SiO3). The products obtained were characterized after 28 days of ageing. The density, porosity, compressive strength, thermal conductivity (TC), thermal diffusivity and specific heat capacity were determined. In general, the Na2SiO3/NaOH ratio has a significant effect on the compressive strength of the MkGPs. The thermal conductivity, thermal diffusivity and specific heat of MkGps measured in this work were in the range between 0.44 to 0.92 W/mK, 0.22 to 0.44 mm2/s and 1 to 3.7 MJ/m3K respectively. The highest compressive strength was 32 MPa achieved with Na2SiO3/NaOH ratio of 1.0. This mix has the best thermophysical performance due to low thermal conductivity, low thermal diffusivity and high specific heat compared to the other alkaline activator ratios. The results showed that the geopolymer is able to be used as the thermal insulating material.

scholarly journals Using of Aerogel to Improve Thermal Insulating Properties of Windows

2018 ◽  
Vol 14 (1) ◽  
pp. 2-11 ◽  
Author(s):  
Denisa Valachova ◽  
Nada Zdrazilova ◽  
Vladan Panovec ◽  
Iveta Skotnicova
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Building Structures ◽  
Insulating Materials ◽  
Insulating Material ◽  
Composite Systems ◽  
Thermal Insulating ◽  
Technical Requirements ◽  
Technical Properties ◽  
Insulating Properties

AbstractFor the best possible thermal-technical properties of building structures it is necessary to use materials with very low thermal conductivity. Due to the increasing thermal-technical requirements for building structures, the insulating materials are developed. One of the modern thermal insulating materials is so-called aerogel. Unfortunately, this material is not used in the field of external thermal insulation composite systems because of its price and its properties. The aim of this paper is to present possibilities of using this insulating material in the civil engineering - specifically a usage of aerogel in the production of windows.

A Novel Poly(Ionic Liquid) as the Thermal Insulating Material

2020 ◽  
Vol 13 (3) ◽  
pp. 241-247
Author(s):  
Wenxin Wei ◽  
Guifeng Ma ◽  
Hongtao Wang ◽  
Jun Li
Keyword(s):  
Thermal Conductivity ◽  
Ionic Liquid ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Flame Resistance ◽  
Insulating Material ◽  
Low Thermal Conductivity ◽  
Thermal Insulating ◽  
Poly Ionic Liquid

Objective: A new poly(ionic liquid)(PIL), poly(p-vinylbenzyltriphenylphosphine hexafluorophosphate) (P[VBTPP][PF6]), was synthesized by quaternization, anion exchange reaction, and free radical polymerization. Then a series of the PIL were synthesized at different conditions. Methods: The specific heat capacity, glass-transition temperature and melting temperature of the synthesized PILs were measured by differential scanning calorimeter. The thermal conductivities of the PILs were measured by the laser flash analysis method. Results: Results showed that, under optimized synthesis conditions, P[VBTPP][PF6] as the thermal insulator had a high glass-transition temperature of 210.1°C, high melting point of 421.6°C, and a low thermal conductivity of 0.0920 W m-1 K-1 at 40.0°C (it was 0.105 W m-1 K-1 even at 180.0°C). The foamed sample exhibited much low thermal conductivity λ=0.0340 W m-1 K-1 at room temperature, which was comparable to a commercial polyurethane thermal insulating material although the latter had a much lower density. Conclusion: In addition, mixing the P[VBTPP][PF6] sample into polypropylene could obviously increase the Oxygen Index, revealing its efficient flame resistance. Therefore, P[VBTPP][PF6] is a potential thermal insulating material.

scholarly journals Sound-Absorbing and Thermal-Insulating Properties of Cement Composite Based on Recycled Rubber from Waste Tires

2021 ◽  
Vol 11 (6) ◽  
pp. 2725
Author(s):  
Jakub Svoboda ◽  
Tomáš Dvorský ◽  
Vojtěch Václavík ◽  
Jakub Charvát ◽  
Kateřina Máčalová ◽  
...  
Keyword(s):  
Building Materials ◽  
Absorption Capacity ◽  
Acoustic Properties ◽  
Strength Characteristics ◽  
Cement Composites ◽  
Waste Tires ◽  
Natural Aggregate ◽  
Thermal Insulating ◽  
Recycled Rubber ◽  
Insulating Properties

This article describes an experimental study aimed at investigating the potential use of recycled rubber granulate from waste tires of fractions 0/1 and 1/3 mm in cement composites as a 100% replacement for natural aggregates. The use of waste in the development and production of new building materials represents an important aspect for the sustainability and protection of the environment. This article is focused on the sound-absorbing and thermal-insulating properties of experimental cement composites based on recycled rubber from waste tires. The article describes the grain characteristics of recycled rubber, sound absorption capacity, thermal conductivity and strength characteristics. The results of this research show that the total replacement of natural aggregate with recycled rubber in cement composites is possible. Replacing natural aggregate with recycled rubber has significantly improved the thermal and acoustic properties of the prepared cement composites, however, at the same time; there was also the expected decrease in the strength characteristics due to the elasticity of rubber.

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