scholarly journals THE USE OF LIGHTWEIGHT AGGREGATE IN PREPARATION OF THERMAL INSULATION LIME-BASED RENDERS

2019 ◽  
Vol 22 ◽  
pp. 83-87
Author(s):  
Jaroslav Pokorný ◽  
Milena Pavlíková ◽  
Zbyšek Pavlík
Keyword(s):  
Thermal Insulation ◽  
Construction Materials ◽  
Lightweight Aggregate ◽  
Experimental Tests ◽  
Hydrated Lime ◽  
Silica Sand ◽  
Mechanical Resistance ◽  
Mechanical And Thermal Properties ◽  
Negative Impacts

Lime-based renders are common part of historical or older buildings that don’t always provide a comfortable inside climate due to the problems with high thermal losses. Thermal insulation renders may possibly retrofit or replace original render layers and mitigate negative impacts of harmful external climate. In this respect, determination of basic structural, mechanical and thermal properties of lime-based renders containing various amount of perlite that was used as partial silica sand replacement is presented in the paper. Experimental tests performed for 28 days high relative humidity-cured samples showed significant decrease in bulk density and apparent density for renders with incorporated perlite compared to reference render mix composed of silica sand-based aggregate only. Accordingly, porosity of perlite mortars was significantly higher, what led to the lower thermal conductivity values in comparison with reference render. Although the mechanical resistance of perlite-modified renders was lower than that of reference material, it was still sufficient for their use as thermal insulation layer compatible with older construction materials. Based on the obtained data it can be concluded, the analysed hydrated lime-based plasters with perlite admixture can be considered as promising materials for buildings refurbishment.

scholarly journals Low-Carbon Composite Based on MOC, Silica Sand and Ground Porcelain Insulator Waste

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 829 ◽  
Author(s):  
Adam Pivák ◽  
Milena Pavlíková ◽  
Martina Záleská ◽  
Michal Lojka ◽  
Anna-Marie Lauermannová ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Mineralogical Composition ◽  
Experimental Tests ◽  
Carbon Composite ◽  
Silica Sand ◽  
Partial Substitution ◽  
Mechanical Resistance ◽  
Low Carbon ◽  
Technical Parameters ◽  
Substitution Ratio

Magnesium oxychloride cement-based composites (MOC) with silica sand/porcelain waste blended fillers were designed and tested. The objective of the presented research was to design and test low carbon, eco-friendly and viable alternatives to Portland cement-based materials. To make new materials environmentally acceptable and sustainable, silica sand applied in the reference composite material was partially substituted by ground porcelain waste (PW) coming from used electrical insulators. The sand substitution ratio was 5, 10, and 15 vol.%. The chemical and mineralogical composition, morphology, and particle size distribution of porcelain waste were measured. For silica sand, porcelain waste, and MgO, specific density, loose bulk density, and Blaine fineness were determined. The effect of porcelain waste on the workability of fresh composite mixtures was characterized by spread diameter. The composites were characterized by their basic structural, mechanical, hygric, and thermal properties. The phase composition and thermal stability at high temperatures of MOC/porcelain waste pastes were also analyzed. Fourier-transform infrared spectroscopy (FT-IR) analysis helped to indicate main compounds formed within the precipitation of MOC phases and their reaction with porcelain waste. The usage of porcelain waste greatly decreased the porosity of composite matrix, which resulted in high mechanical resistance and reduced and decelerated water imbibition. The 10% sand substitution with porcelain waste brought the best mechanical resistance and the lowest water absorption due to the formation of amorphous phases, water-insoluble aluminosilicates. In case of the thermal performance of the examined composites, the low thermal conductivity of porcelain waste was the contradictory parameter to porosity and the high thermal stability of the phases present in porcelain slightly decreased the thermal decomposition of composites with porcelain waste dosage. Based on the results emerged from the experimental tests it was concluded that the partial substitution of silica sand in MOC composites enabled the development of materials possessing interesting and advanced function and technical parameters.

scholarly journals Investigation of Physical Characteristics of Non-Structural Lightweight Aggregate Blocks

2016 ◽  
Author(s):  
Hamid Reza Ashrafi ◽  
Marzieh Sadat Moayyeri ◽  
Peyman Beiranvand
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Construction Materials ◽  
Lightweight Aggregate ◽  
Coarse Grained ◽  
Mechanical Resistance ◽  
Lightweight Aggregates ◽  
Dead Load ◽  
Load Bearing ◽  
Materials Used

Today, the style of light construction materials used in building is one of the most important factors in reducing building's dead load and better performance of the structures in the earthquake. One of the ways to reduce the structure weight is to use lightweight blocks instead of using traditional materials. The main purpose of this research is to compare density, compressive strength and water absorption volume of non-load-bearing lightweight blocks made of natural and artificial lightweight aggregates. Scoria lightweight aggregates of Sanandaj, Ghorveh mine, pumice in Tabriz, Bostanabad mine, and Leca in Leca enterprise have been used to make the samples. Given the importance of the materials used, grading of coarse-grained materials has been conducted based on the standard of 7657 and grading of fine materials have been conducted based on the standard of 302.The experiments' results show that Scoria blocks due to hard texture, and high mechanical resistance of their lightweight aggregates, have had higher compressive strength, and density and lower water absorption volume compared to pumice and Lika lightweight aggregate blocks. Pumice blocks despite having desirable compressive strength and lower density compared to the two other blocks have higher water absorption volume, and do not meet the standard conditions. This same factor causes it faces with less interest. Among these Lika blocks with density of 1151.94 (kg per cubic meter) below 2000 kilograms per cubic meter of Iran density standard of 7782 (28-day compressive strength of 2.57 MPa), higher than 2.5 MPa of Iran compressive strength standard of 7782 (and water absorption volume of 282.92 kg per cubic meter) below 288 kilograms per cubic meter of Iran water absorption volume standard of 7782 (as a non-load-bearing lightweight block) have been diagnosed desirable.

Quality Control of Production Lightweight Ferrocement Plate Using Sustainable Materials

2020 ◽  
Vol 857 ◽  
pp. 10-14
Author(s):  
Nada Mahdi Fawzi A. Jalawi
Keyword(s):  
Thermal Insulation ◽  
Low Cost ◽  
Lightweight Aggregate ◽  
Environmental Conservation ◽  
Low Weight ◽  
Optimum Proportion ◽  
Super Plasticizer ◽  
New Type ◽  
Sustainable Materials

This research is concerned with a new type of ferrocement characterized by its lower density and enhanced thermal insulation. Lightweight ferrocement plates have many advantages, low weight, low cost, thermal insulation, environmental conservation. This work contain two group experimental : first different of layer ferrocement, second different of ratio aggregate to cement. The experiments were made to determined the optimum proportion of cement and lightweight aggregate (recycle thermestone ). A low W/C ratio of 0.4 was used with super plasticizer conforming to ASTM 494 Type G. The compressive strength of the mortar mixes is 20-25 MPa. The work also involved the determination of thermal properties .Thermal conductivity value of this ferrocement plate is between (0.6-0.45)W/m.K.

scholarly journals Using Attapulgite as a Lightweight Aggregate to Produce Structural and Insulating Concrete

2019 ◽  
Vol 26 (2) ◽  
pp. 131-139
Author(s):  
Hind Hussein Hammad ◽  
Zeyad Momtaz Mohamed ◽  
Tmara Rasheed
Keyword(s):  
Thermal Insulation ◽  
Lightweight Concrete ◽  
Low Cost ◽  
Construction Materials ◽  
Lightweight Aggregate ◽  
Economic Feasibility ◽  
Lightweight Aggregate Concrete ◽  
Fine Aggregate ◽  
Low Density ◽  
Aggregate Concrete

The wide spread of lightweight concrete due to its properties like low density, good thermal insulation, and the economic feasibility of low cost for buildings constructed with this type of concrete. The studies in this field of construction materials have varied, in this research, one types of the lightweight concrete was produced. It is a lightweight aggregate concrete. Crushed attapulgite rocks was used as aggregate which fired at temperature of 700°C and used as partially or completely replacement with ordinary aggregates to production low-density concrete blocks both structural and insulating, The properties of the concrete produced which tested for (density, compressive strength, thermal conductivity, linear  shrinkage, splitting  strength) is conformed to the requirements of international specifications, the mix (GP) which contain 50% fine attapulgite aggregate and 50% ordinary fine aggregate with 100% coarse attapulgite aggregate conforms to the properties of structural lightweight concrete  according to ASTM C330 and its gave a density about 1668Kg/m3 and compression strength of 17.5 N/mm2, while the two mixtures (H, HP) consisting of fine and coarse attapulgite aggregate with 100% of the total aggregate in mixture, with weight of 10% from cement as a pozzolana material in the mix HP is identical to the properties of the insulating lightweight aggregate concrete according to ASTM C332 with density about (1380,1432)Kg/m3 and thermal insulation   (0.37,0.41)w/mk°, respectively.

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