Preparation and Performance of Inorganic Thermal Insulation Glazed Hollow Bead Material

2016 ◽  
Vol 680 ◽  
pp. 306-310
Author(s):  
Lei Yu ◽  
Cheng Zhang ◽  
Zhen Gan Wu
Keyword(s):  
Thermal Conductivity ◽  
Surface Morphology ◽  
Thermal Insulation ◽  
Compression Strength ◽  
Lightweight Aggregate ◽  
Optimal Level ◽  
The Other ◽  
High Concern ◽  
Building Wall ◽  
And Performance

Glazed hollow bead, a kind of inorganic lightweight aggregate that has been recently developed, has raised high concern in the field of thermal insulation of building wall due to its low thermal conductivity, low water absorption, good fireproof performance and relatively high compression strength. In this paper, the preparation of this thermal insulation glazed hollow bead material was introduced in detail, the influence of the amount of gel material on bulk density, porosity, thermal conductivity, compression strength of the thermal insulation glazed hollow bead material was investigated, the surface morphology and surface components were characterized by means of SEM and EDS. Results showed that the density, thermal conductivity and compression strength increased while the porosity decreased with the amount of gel material increasing. Appropriate temperature enables gel material to work at optimal level under which the compression strength increases, on the other hand, the porosity also increases, therefore, the thermal conductivity decreases.

Ultrastructural features of the sensori-motor cortex of the primate

1979 ◽  
Vol 285 (1006) ◽  
pp. 123-139 ◽  
Keyword(s):  
Thermal Conductivity ◽  
Motor Cortex ◽  
Thin Layer ◽  
Liquid Helium ◽  
Thermal Insulation ◽  
Solid Surfaces ◽  
The Other ◽  
Experimental Chamber ◽  
Short Discussion ◽  
Inside Wall

cooled to 2°K or lower. Rollin (1936) found that the thermal insulation of vessels containing liquid helium was much worse below than above the A point. He explained his observation by assuming the existence of a thin layer of liquid helium on the inside wall of the connecting tube, and thought it probable that the change in thermal conductivity of this film at the A point gave rise to the anomalous effects observed. As the result of more recent (unpublished) experiments Rollin and Simon* have put forward the other explanation that the film creeps up the tube and evaporates eventually. It is obvious that all these phenomena may have a common explanation and it was the object of the experiments described in this paper and the following paper to investigate the behaviour of He 11 in contact with solid surfaces systematically. The phenomena had to be investigated from various aspects and this made experiments necessary which varied in purpose and character to some extent. For simplicity’s sake we will therefore give, together with the description of each experiment, a short discussion and summarize at the end of the second paper all results in a general discussion on the whole phenomenon. All experiments were carried out in the same cryostat; and for different experiments only the experimental chamber and the experimental arrangement in it were altered.

scholarly journals Novel Core-Shell Non-Sintered Lightweight Aggregate Concrete for Better Properties in Wallboard

2021 ◽  
Author(s):  
Chaoming PANG ◽  
Xinxin MENG ◽  
Chunpeng ZHANG ◽  
Jinlong PAN
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Dry Density ◽  
Core Shell ◽  
Aggregate Concrete ◽  
The Core

Abstract Shrinkage of foam concrete can easily cause cracking and thus makes it difficult for a manufacturer to maintain quality. The density of lightweight aggregate concrete is too high to meet specifications for lightweight and thermal insulation for wallboard. Two types of concrete with dry density in the range 1000–1200 kg/m3 for use in wallboard were designed and prepared using foam and lightweight aggregate. The properties of porous lightweight aggregate concrete with core-shell non-sintered lightweight aggregate were compared with sintered lightweight aggregate concrete along with several dimensions. The two aggregates were similar in particle size, density, and strength. The effects of each aggregate on the workability, compressive strength, dry shrinkage, and thermal conductivity of the lightweight concrete were analyzed and compared. Pore structures were determined by mercury intrusion porosimetry and X-ray computed tomography. Compressive strength ranged from 7.8 to 11.8 MPa, and thermal conductivity coefficients ranged from 0.193 to 0.219 W/m/K for both types of concrete. The results showed that the core-shell non-sintered lightweight aggregate bonded better with the paste matrix at the interface transition zone and had a better pore structure than the sintered lightweight aggregate concrete. Slump flow of the core-shell non-sintered lightweight aggregate concrete was about 20% greater than that of the sintered lightweight aggregate concrete, 28d compressive strength was about 10% greater, drying shrinkage was about 10% less, and thermal conductivity was less. Porous lightweight aggregate concrete using core-shell non-sintered lightweight aggregate performs well when used in wallboard because of its low density, high thermal insulation, and improved strength.

Preparation foam brick from Iraqi local clay

2020 ◽  
Vol 10 ◽  
Author(s):  
Mahasin F.hadi Al –Kadhemi ◽  
Enas Muhi Hadi ◽  
Rawabi Abdullrazzaq
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
Firing Temperature ◽  
Compression Strength ◽  
Weight Ratio ◽  
Kaolin Clay ◽  
Local Clay ◽  
Mixture Ratio ◽  
Foaming Agent

Background: In this present study for preparing foam brick by utilization of local kaolin clay and foaming agent for building and, thermal insulation and construction applications. Methods: This paper deals with the development of foam bricks by independent several of variables are (clay mixture ratio, foam solution ratio, forming mixture ratio and firing temperature), so it has been fixing one of this variable randomly and change another gradually regular and then optimum value to return randomly and thus after that select optimum values of these parameter to produce foam bricks this variables are clay mixture ratio (Mullit:Kaolin ratio is 20:80,40:60 and 60:40 weight ratio), Agent solution ratio (foam agent:water ratio is 0.5:20 ,1:20,1.5:20, 2.5:20,3.5:20 and 4.5:20 weight ratio) and forming mixture ratio (clay mixture:foam solution ratio is 45.5:54.5, 48.87:51.13, 51.14:48.86, 53.51:46.49 and 55.6:44.4 weight ratio). Results: Porosity, thermal conductivity and compression strength has been investigated at (9050,1050)ºC, SEM and XRD also carried out at specimen firing at 950ºC .the results show that optimum foam bricks obtained with 60:40 weight ratio of mullite:kaolin, 1.5:20 and 2.5:20 weight ratio of agent : water respectively and forming mixture ratio was (51.14:48.86 )at 950ºC. Conclusion: The specimens prepared in this way have apparent porosity (as high as 0.46%), exhibiting considerable compressive strength (exceeding 5MPa) and low thermal conductivity (about 0.36 (W/m k)).

Morphology and Performance Analysis of Alpaca and Cashmere Fiber

2013 ◽  
Vol 477-478 ◽  
pp. 1336-1339
Author(s):  
Xiao Ying Wei ◽  
En Long Yang ◽  
Yuan Xue ◽  
Shi Yuan Sun
Keyword(s):  
Performance Analysis ◽  
Surface Morphology ◽  
Mechanical Performance ◽  
Process Development ◽  
Fiber Diameter ◽  
The Other ◽  
Paper Surface ◽  
Spinning Process ◽  
And Performance

Alpaca wool is soft and thin, smooth and delicate, can be applied to many areas of production, such as coat, stuffed shirts, scarves, tapestries, bags, carpets, etc. In this paper, surface morphology and mechanical performance of four kinds of alpaca wool and cashmere were investigated. Fiber diameter, strength and surface morphology of Peru alpaca is similar to Cashmere. Fiber diameter, strength of Peru alpaca is much smaller than those of the other three alpaca wool. The results provide a reference for spinning process development and fiber identification.

Experimental Study of External Thermal Insulation Mortar Based on Fly Ash Floating Bead

2012 ◽  
Vol 476-478 ◽  
pp. 1643-1646 ◽  
Author(s):  
Jin Ping Chen
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
Portland Cement ◽  
Thermal Insulation ◽  
Lightweight Aggregate ◽  
Expanded Polystyrene ◽  
The Other ◽  
Exterior Wall ◽  
Thermal Insulating ◽  
Better Than

In this paper, the development and properties of floating bead insulation mortar were introduced. Based on the experimental study, a new kind of exterior wall external thermal insulating mortar had been successfully produced. For this material, fly ash floating bead and expanded pearlite which was modified by hydrophobe were taken as the lightweight aggregate, meanwhile, Portland cement was used as the inorganic binder, also the fiber and polymer were taken as the additive. The results of experiments indicated that properties of fly ash floating bead insulating mortar, such as thermal insulation, strength, crack resistant and climate resistant, were superior to those of expanded pearlite insulating mortar. On the other hand, other properties, such as bulk stability, aging resistant, climate resistant, crack resistant and fireproofing, construction workability were much better than those of expanded polystyrene sheet ( EPS) insulating mortar.

scholarly journals Cup Plant (Silphium perfoliatum L.) Biomass as Substitute for Expanded Polystyrene in Bonded Leveling Compounds

Agronomy ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 178
Author(s):  
Lüders Moll ◽  
Martin Höller ◽  
Charlotte Hubert ◽  
Christoph A. C. Korte ◽  
Georg Völkering ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Compression Strength ◽  
Biogas Production ◽  
Lightweight Aggregate ◽  
Expanded Polystyrene ◽  
Partial Substitution ◽  
Highly Sensitive ◽  
Food Applications ◽  
Biomass Plant ◽  
Shape Characteristics

Biomass for non-food applications is considered as a substitute for petro-based materials such as expanded polystyrene (EPS). This research analyzes physical properties of an EPS containing commercial bonded leveling compound (BLC) which was substituted with cup plant (Silphium perfoliatum L.) biomass. Cup plant is a high-yielding biomass plant with several ecological benefits that is yet mainly used for biogas production. Furthermore, the high amount of parenchyma in senescent biomass with its EPS-like structure could be a possible substitute for petrochemical foams in lightweight aggregates. The natural variation in parenchyma content of several European cup plant accessions is promising, regarding the development of cultivars with suitable biomass properties for the proposed material use. Two binders with different proportions of cup plant and EPS were used to produce samples of BLC for thermal conductivity and compression strength tests. The compression strength of 0.92 N mm−2 and a thermal conductivity of 84 mW m−1 K−1 were analyzed and comparable to the commercial BLC. The thermal conductivity within the tested borders appears nearly independent of the biomass content. With increasing cup plant content, the shape characteristics of the lightweight aggregate mix changes towards more elongated aggregates. The mechanical strength and thermal conductivity are highly sensitive to the water demand of the biomass. Direct partial substitution of EPS by cup plant appears feasible and could be a part of the decarbonization of the construction sector.

Properties of Lightweight Concretes Made of Aggregate from Recycled Glass

2016 ◽  
Vol 249 ◽  
pp. 67-72
Author(s):  
Martin Sedlmajer ◽  
Jiri Zach
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Bulk Density ◽  
Thermal Insulation ◽  
Lightweight Aggregate ◽  
Cement Concrete ◽  
Primary Parameter ◽  
Basic Properties ◽  
Recycled Glass ◽  
Hardened State

The paper describes the basic properties of newly developed lightweight cement concrete containing lightweight aggregate based on recycled glass. The basic properties of concrete were observed, i.e. bulk density in fresh and hardened state and compressive strength. Given the low bulk density of the concretes being designed, thermal conductivity is also observed in order to assess the options off improving thermal insulation properties in a structure where such concrete may be used. Thermal insulation properties are the primary parameter in the implementation of floor or ceiling structure composition.

An ultralow-temperature superelastic polymer aerogel with high strength as a great thermal insulator under extreme conditions

2020 ◽  
Vol 8 (36) ◽  
pp. 18698-18706
Author(s):  
Ting Wang ◽  
Man-Cheng Long ◽  
Hai-Bo Zhao ◽  
Bo-Wen Liu ◽  
Hai-Gang Shi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Flame Retardancy ◽  
High Strength ◽  
Extreme Conditions ◽  
Thermal Insulator ◽  
Ultralow Temperature ◽  
Polymer Aerogel ◽  
And Performance ◽  
Harsh Conditions

Taking advantage of structural elastic strategy to create polymer aerogels with ultralow-temperature superelasticity. The aerogels also display low thermal conductivity, excellent thermal insulation under harsh conditions, flame retardancy, and performance stability.

scholarly journals Study of behaviour of thermal insulation materials under extremely low pressure

2019 ◽  
Vol 282 ◽  
pp. 02044
Author(s):  
Jiří Zach ◽  
Jitka Peterková ◽  
Jan Bubeník
Keyword(s):  
Thermal Conductivity ◽  
Heat Conduction ◽  
Heat Transport ◽  
Thermal Insulation ◽  
Pressure Change ◽  
Low Pressure ◽  
The Other ◽  
Atmosphere Pressure ◽  
Insulation Materials ◽  
Vacuum Insulation

In most thermal insulation materials, reduced internal pressure improves thermal insulation properties. It reduces heat transport by convection as well as heat conduction in gases in the material´s pore structure. The dependence of thermal conductivity on pressure is individual to every type of insulation with open porosity. In general, a material with fine porosity is not very sensitive to pressure change within the range of very low pressure to vacuum. On the other hand, materials with a larger number of bigger pores are more sensitive to changing pressure. Any pressure change between atmosphere pressure and vacuum causes a change in thermal conductivity. The paper presents the results of an investigation into the behaviour of alternative fibrous insulations usable in the production of vacuum insulation panels at low pressure.

scholarly journals Biobased foams for thermal insulation: material selection, processing, modelling, and performance

RSC Advances ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 4375-4394
Author(s):  
Rebecca Mort ◽  
Keith Vorst ◽  
Greg Curtzwiler ◽  
Shan Jiang
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Thermal Insulation ◽  
Material Selection ◽  
Insulation Material ◽  
Materials Selection ◽  
Thermal Insulation Material ◽  
Low Thermal Conductivity ◽  
And Performance

This review outlines the progress in biobased foams with a focus on low thermal conductivity. It introduces materials selection and processing, compares performance, examines modelling of physical properties, and discusses challenges in applying models to real systems.

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