scholarly journals THE INFLUENCE OF GLASS CONTAINING COMPONENT ON GYPSUM BINDER AND DRY MIX MORTAR PROPERTIES

2020 ◽  
Vol 22 (5) ◽  
pp. 129-138
Author(s):  
G. V. Sopegin ◽  
N. S. Semeynykh ◽  
D. Ch. Rustamova
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Adhesive Strength ◽  
Foam Glass ◽  
Strength Increase ◽  
Ceramic Brick ◽  
Initial Setting ◽  
Softening Coefficient ◽  
Insulating Properties

 The paper studies the properties of the gypsum binder after the addition of glass containing component (crushed granulated foam glass) and the suitability of the latter for the development of a new composition of the heat-insulated gypsum mixture.It is shown that the addition of the glass containing component (GCC) fraction of 0.14–1.25 mm in the amount of 5–15 % provides the highest strength increase of the gypsum binder. The presence of GCC fractions of 0.063–0.14 mm in the composition of the gypsum binder increases its softening coefficient from 0.42 to 0.48.The main properties of the gypsum mixture are studied after the addition of the GCC fraction of 0.063–4.0 mm in the amount of 30, 40 and 50 % of the binder mass. The initial setting of the GСС-containing mortar mixture occurs no later than in 6 minutes. The introduction of 50 % GCC significantly reduces the water retaining power to 85 %. An increase in the GСС content from 30 to 50 % in the composition of the gypsum mixture leads to a decrease in the thermal conductivity of the samples from 0.279 to 0.209 W/(m×°С). The compressive strength reduces from 15.85 to 9.273 MPa as the GСС content increases to 50 %. The adhesive strength to ceramic brick for compositions containing 30 and 40 % GСС ranges from 0.44 to 0.69 MPa.In relation to physical, mechanical and heat insulating properties, compositions containing 30 and 40 % of GСС are the most effective. These compositions can be modified by the addition of various setting retardants, water-retaining and plasticizing additives.

Study on Preparation and Properties of Vitrified Beads-Polystyrene Particles Insulation Mortar

2014 ◽  
Vol 538 ◽  
pp. 3-6
Author(s):  
Yu Peng Chen ◽  
Wen Hong Tao ◽  
Xing Hua Fu ◽  
Li Yuan Dong ◽  
Hai Tao Yu
Keyword(s):  
Electron Microscopy ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Dry Density ◽  
Function Mechanism ◽  
Testing Method ◽  
Hydrophobic Agent ◽  
Polypropylene Monofilament ◽  
Softening Coefficient ◽  
Scanning Electron

Orthogonal testing method was used to study the effects of polystyrene particles, hydrophobic agent, air-entraining agent, polypropylene monofilament fiber on dry density, compressive strength, water absorption and softening coefficient of composite insulation mortar. The optimal ratio was obtained as: 3% of the weight are polystyrene particles, 0.2% is hydrophobic agent, air-entraining agent counts for 0.4wt%，and polypropylene monofilament fiber 0.6%. The main performances of the mortar were recorded as: dry density was 228Kg/m3, 28 day compressive strength after conserved for 28 days was 0.54MPa, and thermal conductivity 0.0596W/(m•K). Microstructure of the composite insulation mortar was analyzed by SEM (scanning electron microscopy) and its function mechanism was studied preliminarily.

scholarly journals Mechanical Properties and Thermal Conductivity of Aerogel-Incorporated Alkali-Activated Slag Mortars

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Levent Bostanci ◽  
Ozlem Celik Sola
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Conductivity Coefficient ◽  
Experimental Studies ◽  
Strength Test ◽  
Strength Increase ◽  
Alkali Activated Slag ◽  
Compressive Strength Test ◽  
Activated Slag ◽  
Alkali Activated

Compressive strength, thermal conductivity coefficient, and porosimetric properties of alkali-activated slag (AAS) mortars containing silica aerogel were investigated experimentally in this study. For this purpose, slag mortar mixtures at 0.75% and 1.0% aerogel content ratios were prepared, and these mortar mixtures were activated with lithium carbonate (Li2CO3) at 0.03% and 1.50% dosage rates. Mortar samples were exposed to curing process in water for 2, 7, and 28 days, and the samples, which completed the curing stage, were subjected to the compressive strength test. The porosimetry test and the thermal conductivity coefficient measurement were carried out following the compressive strength test on 28-day samples. The varying aerogel content rate in the mixtures and the effects of the dosage of Li2CO3 on the gel, capillary, and macropore distributions, and the effect of changing porosimetric properties on compressive strength and thermal conductivity coefficient were analyzed in detail. Experimental studies have shown that AAS mortars including an optimum 0.75% aerogel content rate and 0.03% Li2CO3 activation provided a compressive strength of 34.1 MPa and a thermal conductivity coefficient of 1.32 W/mK. Aerogel addition provides a partial compressive strength increase at 7- and 28-day samples while it also causes maximum strength loss of 5.0% at 2-day samples.

scholarly journals USE OF SECONDARY RAW RESOURCE IN THE PRODUCTION OF WALL MATERIALS

2019 ◽  
Author(s):  
В.Х. Хадисов ◽  
А.З. Абуханов ◽  
М.Р. Хаджиев
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Frost Resistance ◽  
Lightweight Concrete ◽  
Environmental Safety ◽  
Ceramic Brick ◽  
Manufacturing Defects ◽  
Low Thermal Conductivity ◽  
Wall Materials ◽  
The Cost

Данная работа посвящена решению актуальной проблемы утилизации техногенных сырьевых ресурсов в виде керамического кирпичного боя и производственного брака с получением вторичного мелкого и крупного заполнителя, для дальнейшего изготовления мелкоштучных изделий на основе керамобетона. Внедрение предлагаемой безотходной ресурсосберегающей технологии получения стеновых материалов позволит поддерживать экологическую безопасность окружающей среды. Отмечается специфика приготовления формовочных керамобетонных смесей, особенности формирования структуры исследуемых композиций. Приводятся рецептуры легких бетонов на основе керамического кирпичного заполнителя и результаты исследования свойств, необходимых для получения качественных и долговечных мелкоштучных материалов. Изучались такие свойства, как плотность, теплопроводность, морозостойкость и прочность на сжатие, так как именно к этим характеристикам предъявляются особые требования. Разработанные составы легких керамобетонов имели достаточно низкие показатели теплопроводности в пределах 0,490,98 Вт/ (мС), марка керамобетона по морозостойкости находилась в пределах от F50 до F100, плотность изменялась от 13001700кг/м3, значение предела прочности при сжатии достигало 41 МПа. Использование кирпичного боя в легких бетонах позволит снизить себестоимость продукции на 3035. This work is devoted to solving the problems associated with the use of manmade frequency resources in the form of ceramic bricks and manufacturing defects with the production of secondary small and large aggregates for the further manufacture of small piece products based on ceramicconcrete. The introduction of the proposed wastefree resourcesaving technology for wall materials allows you to maintain the environmental safety of the environment. The specifics of the preparation of molding ceramicconcrete mixtures, the features of the formation of the structure of the studied compositions are noted. Formulations of lightweight concrete based on ceramic brick aggregate and the results of the study of the properties necessary for obtaining highquality and durable smallpiece materials are given. Properties such as density, thermal conductivity, frost resistance and compressive strength have been studied, since it is these characteristics that have special requirements. The developed lightweight porcelain compositions had relatively low thermal conductivity in the range of 0.490.98 W / (m C), the grade of frost resistance by frost resistance ranged from F50 to F100, the density changed from 13001700 kg / m3, the value Compressive strength reached 41 MPa. The use of brick battle in lightweight concretes will reduce the cost of production by 3035.

scholarly journals Development of Wood-Crete from Hardwood and Softwood Sawdust

2013 ◽  
Vol 7 (1) ◽  
pp. 108-117 ◽  
Author(s):  
Eboziegbe Patrick Aigbomian ◽  
Mizi Fan
Keyword(s):  
Thermal Conductivity ◽  
Particle Size ◽  
Compressive Strength ◽  
Wood Species ◽  
Strength Properties ◽  
Particle Sizes ◽  
Wood Sawdust ◽  
Thermal Insulating ◽  
Structural Applications ◽  
Insulating Properties

Wood-crete, a new building material has previously been developed from sawdust, inorganic binder and addition of waste paper, finding its use mainly for wall panelling or other non- and semi-structural applications with good thermal insulating properties. In this study, the properties of wood-crete were investigated based on the type of wood sawdust – hardwood (beech and oak) and softwood (pine and cedar). The results showed that (1) the compressive strength of wood-crete was closely related to the wood species, with the compressive strength of 3.93MPa being for hardwood wood-crete compared to 1.37MPa and 0.26MPa of wood-crete from softwood and mixed wood respectively; (2) wood-crete from hardwood sawdust had a higher density than those made from softwood sawdust and mixed wood; (3) particle size had a significant influence on the strength properties and density of wood-crete with wood-crete made from 1mm particle size recording a higher compressive strength and density compared to 2mm and 3mm particle size. The optimum size for wood-crete was dependent on the wood species; (4) thermal conductivity of wood-crete was closely related to the chemical composition of various wood species, with softwood wood-crete having about 20% lower thermal conductivity compared to hardwood wood-crete; (5) a ratio of 1:2 of sawdust to binder was found advisable for the production of wood-crete for various wood species and particle sizes investigated. The compressive strength of wood-crete made from sawdust of both softwood and hardwood was similar to or higher than that of hempcrete, indicating their suitability for wall panelling or other non- and semi-structural applications. The results of this study provide an important foundation for choosing what wood species, particle sizes and combinations of sawdust to be used for the production of wood-crete.

scholarly journals Optimal density for balancing the thermal conductivity and compressive strength of foamed ceramic

2021 ◽  
Vol 2069 (1) ◽  
pp. 012211
Author(s):  
Yue Lei ◽  
Xing Zheng ◽  
Mei Dou ◽  
Lihong Zheng ◽  
Mingfang Tang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Nonlinear Regression ◽  
Mechanical Performance ◽  
National Standard ◽  
Strength Increase ◽  
Density Range ◽  
Optimal Density ◽  
Building Engineering ◽  
The Relationship

Abstract Foamed ceramic becomes increasingly popular in building engineering due to its thermal, acoustic and other advantages. However, conflicts often exist between its different properties. In this paper, we seek a balance between the thermal conductivity and the compressive strength of foamed ceramic. Experiments are performed on foamed ceramic with different densities. Nonlinear regression is then adopted to quantify the relationship between the thermal conductivity/compressive strength and the bulk density. The results indicate that both the thermal conductivity and the compressive strength increase with the rising density. Based on the requirements in the Chinese national standard, the optimum density range of foamed ceramic is proposed, satisfying a balance between the thermal and mechanical performance.

The influence of the addition of ground olive stone on the thermo-mechanical behavior of compressed earth blocks

2020 ◽  
Vol 108 (2) ◽  
pp. 203
Author(s):  
Samia Djadouf ◽  
Nasser Chelouah ◽  
Abdelkader Tahakourt
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Mechanical Behavior ◽  
Agricultural Waste ◽  
Hydraulic Press ◽  
Dry Density ◽  
Olive Stone ◽  
Compressed Earth Blocks ◽  
Clay Matrix ◽  
Earth Blocks

Sustainable development and environmental challenges incite to valorize local materials such as agricultural waste. In this context, a new ecological compressed earth blocks (CEBS) with addition of ground olive stone (GOS) was proposed. The GOS is added as partial clay replacement in different proportions. The main objective of this paper is to study the effect of GOS levels on the thermal properties and mechanical behavior of CEB. We proceeded to determining the optimal water content and equivalent wet density by compaction using a hydraulic press, at a pressure of 10 MPa. The maximum compressive strength is reached at 15% of the GOS. This percentage increases the mechanical properties by 19.66%, and decreases the thermal conductivity by 37.63%. These results are due to the optimal water responsible for the consolidation and compactness of the clay matrix. The substitution up to 30% of GOS shows a decrease of compressive strength and thermal conductivity by about 38.38% and 50.64% respectively. The decrease in dry density and thermal conductivity is related to the content of GOS, which is composed of organic and porous fibers. The GOS seems promising for improving the thermo-mechanical characteristics of CEB and which can also be used as reinforcement in CEBS.

COMPRESSIVE STRENGTH AND THERMAL CONDUCTIVITY OF WATER AND AIR CURED PORTLAND CEMENT-FLY ASH-SILICA FUME MORTARS

2018 ◽  
Vol 17 (9) ◽  
pp. 2023-2030
Author(s):  
Arnon Chaipanich ◽  
Chalermphan Narattha ◽  
Watcharapong Wongkeo ◽  
Pailyn Thongsanitgarn
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Silica Fume

Incorporation of Iraqi Rocks in the Production of Eco-Friendly Cement Mortar

2020 ◽  
Vol 38 (10A) ◽  
pp. 1522-1530
Author(s):  
Rawnaq S. Mahdi ◽  
Aseel B. AL-Zubidi ◽  
Hassan N. Hashim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Structural Properties ◽  
Mechanical Milling ◽  
Cement Mortar ◽  
Cement Mortars

This work reports on the incorporation of Flint and Kaolin rocks powders in the cement mortar in an attempt to improve its mechanical properties and produce an eco-friendly mortar. Flint and Kaolin powders are prepared by dry mechanical milling. The two powders are added separately to the mortars substituting cement partially. The two powders are found to improve the mechanical properties of the mortars. Hardness and compressive strength are found to increase with the increase of powders constituents in the cement mortars. In addition, the two powders affect water absorption and thermal conductivity of the mortar specimens which are desirable for construction applications. Kaolin is found to have a greater effect on the mechanical properties, water absorption, and thermal conductivity of the mortars than Flint. This behavior is discussed and analyzed based on the compositional and structural properties of the rocks powders.

MEEHANITE GB300

Alloy Digest ◽  
2020 ◽  
Vol 69 (11) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Gray Cast Iron ◽  
High Strength ◽  
Heat Treating ◽  
Spheroidal Graphite ◽  
Cast Irons ◽  
Test Pieces ◽  
Temperature Performance

Abstract Meehanite GB300 is a pearlitic gray cast iron that has a minimum tensile strength of 300 MPa (44 ksi), when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter test bars. This grade exhibits high strength while still maintaining good thermal conductivity and good machinability. It is generally used for applications where the thermal conductivity requirements preclude the use of other higher-strength materials, such as spheroidal graphite cast irons, which have inferior thermal properties. This datasheet provides information on physical properties, hardness, tensile properties, and compressive strength as well as fatigue. It also includes information on low and high temperature performance as well as heat treating, machining, and joining. Filing Code: CI-75. Producer or source: Meehanite Metal Corporation.

scholarly journals Effect of Calcium Nitrate on the Properties of Portland–Limestone Cement-Based Concrete Cured at Low Temperature

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1611
Author(s):  
Gintautas Skripkiūnas ◽  
Asta Kičaitė ◽  
Harald Justnes ◽  
Ina Pundienė
Keyword(s):  
Compressive Strength ◽  
Cement Paste ◽  
Setting Time ◽  
Calcium Nitrate ◽  
Curing Temperature ◽  
Hardened Concrete ◽  
Cement Pastes ◽  
Initial Setting Time ◽  
Initial Setting ◽  
Early Strength

The effect of calcium nitrate (CN) dosages from 0 to 3% (of cement mass) on the properties of fresh cement paste rheology and hardening processes and on the strength of hardened concrete with two types of limestone-blended composite cements (CEM II A-LL 42.5 R and 42.5 N) at different initial (two-day) curing temperatures (−10 °C to +20 °C) is presented. The rheology results showed that a CN dosage up to 1.5% works as a plasticizing admixture, while higher amounts demonstrate the effect of increasing viscosity. At higher CN content, the viscosity growth in normal early strength (N type) cement pastes is much slower than in high early strength (R type) cement pastes. For both cement-type pastes, shortening the initial and final setting times is more effective when using 3% at +5 °C and 0 °C. At these temperatures, the use of 3% CN reduces the initial setting time for high early strength paste by 7.4 and 5.4 times and for normal early strength cement paste by 3.5 and 3.4 times when compared to a CN-free cement paste. The most efficient use of CN is achieved at −5 °C for compressive strength enlargement; a 1% CN dosage ensures the compressive strength of samples at a −5 °C initial curing temperature, with high early strength cement exceeding 3.5 MPa but being less than the required 3.5 MPa in samples with normal early strength cement.

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