The effect of pozzolan addition on the physical and mechanical properties of lime mortar

Hydrated lime, due to its life cycle (return to the natural form as a result of binding and hardening) shows a positive ecological aspect. The binder is often used in building materials based on plant components due to the high alkaline reaction and low diffusion resistance, as well as in mortars and plasters. However, it is an air binder with low strength parameters and the process of its binding and hardening is long-lasting. One of the ways to accelerate the binding processes and also to increase the strength of the binder is the use of additives in the form of pozzolanic materials which react with calcium hydroxide and form compounds with hydraulic properties. These are natural materials or industrial waste, so they do not affect the environmental impact of lime binder. The article presents the influence of the addition of pozzolan (three types) in various weight amounts, on the strength properties of mortars, their absorbability and capillary rise (presented as water absorption coefficient). The influence of pozzolan presence on workability of fresh mortars - their consistency was also checked.

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Concrete based on sulfur binder being modified with inorganic additives

MATEC Web of Conferences ◽

10.1051/matecconf/201821201013 ◽

2018 ◽

Vol 212 ◽

pp. 01013

Author(s):

Vadim Balabanov ◽

Victor Baryshok ◽

Nikita Epishkin

Keyword(s):

Frost Resistance ◽

Building Materials ◽

Physical And Mechanical Properties ◽

High Strength ◽

Strength Properties ◽

Climatic Conditions ◽

Freezing And Thawing ◽

Concrete Mixtures ◽

Irkutsk Region ◽

Water Saturated

The sharply continental climate of the Irkutsk region is characterized by wide temperature intervals throughout the year. The repeated cyclicity of freezing and thawing of building materials in the water-saturated state influences the change in technical characteristics and the durability of concrete products and structures. The concrete products’ features in such climatic conditions create the need for the production of concretes with improved indicators of physical and mechanical properties. The effect of modifying additives on the technological characteristics of sulfur concrete is established. The effect of all elements of sulfur concrete on its strength and frost resistance. The composition of sulfuric concrete is obtained, which meets all the requirements and also has high strength and increased frost resistance. Formulations with a certain ratio of structural sulfuric concrete mixtures were developed. As a result of the use of technical sulfur in the composition of concrete products, the problem of utilizing annually accumulating reserves of technical sulfur is partially solved. The strength properties of sulfuric concretes easily compete with high-quality brands of concrete, special types of concretes that have in their composition additives.

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Ceramic Composition Material with Mullite Crystals Obtained from the Clayy Raw Material of Yakutia

Materials Science Forum ◽

10.4028/www.scientific.net/msf.992.253 ◽

2020 ◽

Vol 992 ◽

pp. 253-258

Author(s):

M.P. Lebedev ◽

V.N. Tagrov ◽

E.S. Lukin

Keyword(s):

Building Materials ◽

Raw Materials ◽

Practical Interest ◽

Physical And Mechanical Properties ◽

Ceramic Materials ◽

Strength Properties ◽

Raw Material ◽

Composition Material ◽

Material Base ◽

Wide Range

The article deals with the manufacture of modern structural ceramic materials from clay and loam deposits of the Republic of Sakha (Yakutia). The importance and relevance of the development of the production of building materials from local raw materials is emphasized, since this will certainly affect the effectiveness of the construction complex as a whole. The successful development of the construction complex is capable of not only stimulating growth in all sectors of the economy, but also contributes to solving the most pressing social problems. Today, Yakutia has huge reserves of mineral raw materials for the production of a wide range of building materials and products. Of practical interest are wall materials made from clay soils. Given the features of the region’s raw material base, this work focuses on additional processing of traditional material. Controlling the complex physicochemical and structural-mechanical transformations that occur during heat treatment, a methodology has been developed for creating a composite material that will allow competitive innovative materials with enhanced strength properties to be produced with a reinforcing element with a glassy phase matrix of mullite crystals. The fabricated samples have a wide range of physical and mechanical properties and allow using it as a high-quality structural building ceramics, as well as industrial floor technical tile.

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Analysis of Physical and Mechanical Properties of the Mortar in the Historic Retaining Wall of the Gediminas Castle Hill (Vilnius, Lithuania)

Materials ◽

10.3390/ma12010008 ◽

2018 ◽

Vol 12 (1) ◽

pp. 8 ◽

Cited By ~ 6

Author(s):

Bronius Jonaitis ◽

Valentin Antonovič ◽

Arnoldas Šneideris ◽

Renata Boris ◽

Robertas Zavalis

Keyword(s):

Building Materials ◽

Retaining Wall ◽

Physical And Mechanical Properties ◽

Load Bearing Capacity ◽

Joint Research ◽

Hydraulic Lime ◽

Lime Mortar ◽

Historic Masonry ◽

Entire Height ◽

Mechanical And Physical Properties

This study analysed the results of the joint research into the building materials of the historic masonry of the retaining wall of the Gediminas Castle Hill dating back to the end of the 13th and beginning of the 14th centuries. Core samples for material testing were collected along the entire height of the retaining wall to assess its load bearing capacity. Boreholes were drilled 600–1000 mm from the exterior of the wall to determine the properties of the ceramic bricks and lime mortar that were not affected by external factors. The analysis of the microstructure and chemical composition, mechanical and physical properties of the ceramic bricks and lime mortar is presented. The high compressive strength (8.5 MPa) of the lime mortar was the result of using hydraulic lime and crumbs of ceramic bricks as mortar aggregate.

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Assessment of the Impact of Inaccuracy and Variability of Material and Selected Technological Factors on Physical and Mechanical Properties of Fresh Masonry Mortars and Plasters

Materials ◽

10.3390/ma13061382 ◽

2020 ◽

Vol 13 (6) ◽

pp. 1382

Author(s):

Małgorzata Gołaszewska ◽

Jacek Gołaszewski ◽

Grzegorz Cygan ◽

Jerzy Bochen

Keyword(s):

Mechanical Properties ◽

Physical And Mechanical Properties ◽

Hydrated Lime ◽

Strength Properties ◽

Technological Factors ◽

Air Content ◽

Lime Mortars ◽

Mixing Intensity ◽

The Impact ◽

Plasticizing Admixture

The article presented the analysis of the impact that various kinds of technological inaccuracies have on the properties of fresh masonry mortars and plasters. Analyzed were the inaccuracies in dosing of mortar components, namely, water, lime, and air-entraining plasticizing admixture (APA) (±10% of mass), and the effect of variable technological conditions, namely, different mixing intensity (fast, slow, normal) and temperature (5 °C, 20 °C, and 35 °C) during first 72 h after mixing. The impact of differences in the properties of cement and aerial (hydrated) lime originating from different manufacturers was also analyzed. The impact of these factors was determined for consistency, density, air content, compressive, and flexural strength. The sensitivity to changes in the analyzed properties was determined by the coefficient of variation. Changes in the dosing of constituents, mixing speed, and temperature adversely affected strength properties. For mortars with APA, these changes exceeded 20% and reached 40%. The greatest impact was evident in the consistency, especially with an excess of APA, where changes ranged from 6% to 80%. The results showed greater resistance of cement-lime mortars to changing selected technological conditions and errors in measuring the amount of ingredients than mortars with air-entraining plasticizing admixture (APA).

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Analysis of the stress-strain state of copper M0B under different schemes of equal channel angular pressing and its effect on the structure and physical and mechanical properties

Voprosy Materialovedeniya ◽

10.22349/1994-6716-2019-97-1-47-53 ◽

2019 ◽

pp. 47-53

Author(s):

L. F. Sennikova ◽

G. K. Volkova ◽

V. M. Tkachenko

Keyword(s):

Equal Channel Angular Pressing ◽

Strain State ◽

Physical And Mechanical Properties ◽

Strength Properties ◽

Stress Strain ◽

Loading Pattern ◽

Stress Strain State ◽

Angular Pressing ◽

Fine Copper ◽

Copper Structure

The results of studies of the stress-strain state of copper M0b after deformation under different schemes of equal channel angular pressing (ECAP) are presented. The level of macro and micro stresses in copper has been determined in various ECAP modes. It is shown that the strength properties, deformation porosity and parameters of the fine copper structure differ depending on the loading pattern.

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Mortars with Recycled Aggregates from Building-Related Processes: A ‘Four-Step’ Methodological Proposal for a Review

Sustainability ◽

10.3390/su13052756 ◽

2021 ◽

Vol 13 (5) ◽

pp. 2756

Author(s):

Federica Vitale ◽

Maurizio Nicolella

Keyword(s):

Building Materials ◽

Thermal Analyses ◽

Construction Materials ◽

Physical And Mechanical Properties ◽

Research Trends ◽

Mix Design ◽

Recycled Aggregates ◽

Design Parameters ◽

Natural Aggregates ◽

By Products

Because the production of aggregates for mortar and concrete is no longer sustainable, many attempts have been made to replace natural aggregates (NA) with recycled aggregates (RA) sourced from factories, recycling centers, and human activities such as construction and demolition works (C&D). This article reviews papers concerning mortars with fine RA from C&D debris, and from the by-products of the manufacturing and recycling processes of building materials. A four-step methodology based on searching, screening, clustering, and summarizing was proposed. The clustering variables were the type of aggregate, mix design parameters, tested properties, patents, and availability on the market. The number and the type of the clustering variables of each paper were analysed and compared. The results showed that the mortars were mainly characterized through their physical and mechanical properties, whereas few durability and thermal analyses were carried out. Moreover, few fine RA were sourced from the production waste of construction materials. Finally, there were no patents or products available on the market. The outcomes presented in this paper underlined the research trends that are useful to improve the knowledge on the suitability of fine RA from building-related processes in mortars.

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Strength Properties of Activated Hwangtoh Mortars

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.168-170.709 ◽

2010 ◽

Vol 168-170 ◽

pp. 709-715

Author(s):

Dongsik Oh ◽

Doheom Song ◽

Seongseok Go

Keyword(s):

Compressive Strength ◽

Blast Furnace ◽

Blast Furnace Slag ◽

Building Materials ◽

Strength Properties ◽

Mixing Conditions ◽

Substitution Ratio ◽

Pozzolanic Properties ◽

The Relationship ◽

Furnace Slag

Hwangtoh (loess) has pozzolanic properties that mean it can be used as a cement admixture when activated at high temperatures, and that it can be used in combination with building materials such as fly ash or blast furnace slag. This study aimed to analyze the relationship between the compressive strength and the brick bond strength of various mortars containing hwangtoh, and also to find the optimum mixing conditions for the use of hwangtoh. It was found that the mortars’ strength properties are significantly influenced by the water/cement ratio W/C and the activated hwangtoh substitution ratio. We recommend the following materials and mixing conditions: W/C 60%, a cement substitution ratio of activated hwangtoh of 20 ~ 25%, and the addition of 10% blast furnace slag to improve the compressive strength of such mortars.

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Study of the Effect of PP and LDPE Thermoplastic Binder Addition on the Mechanical Properties and Physical Properties of Particulate Composites for Building Material Application

Materials Science Forum ◽

10.4028/www.scientific.net/msf.964.115 ◽

2019 ◽

Vol 964 ◽

pp. 115-123

Author(s):

Sigit Tri Wicaksono ◽

Hosta Ardhyananta ◽

Amaliya Rasyida ◽

Feisha Fadila Rifki

Keyword(s):

Mechanical Properties ◽

Compression Strength ◽

Building Materials ◽

Construction Material ◽

Construction Materials ◽

Physical And Mechanical Properties ◽

Waste Recycling ◽

Plastic Waste ◽

Particulate Composites ◽

Water Absorbability

Plastic waste is majority an organic material that cannot easily decomposed by bacteria, so it needs to be recycled. One of the utilization of plastic waste recycling is become a mixture in the manufacture of building materials such as concrete, paving block, tiles, roof. This experiment purpose to find out the effect of addition of variation of LDPE and PP thermoplastic binder to physical and mechanical properties of LDPE/PP/Sand composite for construction material application. In this experiment are using many tests, such are SEM, FTIR, compression strength, density, water absorbability, and hardness. the result after the test are the best composition of composite PP/LDPE/sand is 70/0/30 because its have compression strength 14,2 MPa, while density value was 1.30 g/cm3, for the water absorbability is 0.073%, and for the highest hardness is 62.3 hardness of shore D. From the results obtained, composite material can be classified into construction materials for mortar application S type with average compression strength is 12.4 MPa.

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Impact of Elevated Temperatures on Strength Properties and Microstructure of Calcium Sulfoaluminate Paste

Materials ◽

10.3390/ma14226751 ◽

2021 ◽

Vol 14 (22) ◽

pp. 6751

Author(s):

Konrad A. Sodol ◽

Łukasz Kaczmarek ◽

Jacek Szer ◽

Sebastian Miszczak ◽

Mariusz Stegliński

Keyword(s):

Compressive Strength ◽

Building Materials ◽

Elevated Temperatures ◽

Cooling System ◽

Base Material ◽

Visual Assessment ◽

Strength Properties ◽

Strength Parameters ◽

Calcium Sulfoaluminate ◽

Wide Range

This article is motivated by civil fire safety. Fire-prevention engineering demands a wide range of information about building materials including alternative cements, for instance CSA-cement. Because of exposure of the cement-base material to a high temperature, its strength properties deteriorate due to dehydration connected with phase and microstructure changes. Previous research indicated that the main endothermic reaction of CSA-based composite, dehydration of ettringite, might be used as a cooling system for a metal structure during fire-load. This article examines visual assessment, microstructure, density, as well as flexural and compressive strength parameters of CSA-based composite after isothermal heating at temperatures from 23 °C to 800 °C. The results of SEM/EDS investigations showed that the calcium sulfoaluminate paste may start partially re-sintering above 600 °C. Mechanical tests revealed significant reduction of strength parameters but residual compressive strength was maintained in the whole temperature range e.g., 8 MPa at 800 °C. Additionally, visual assessment of the specimens indicated that it might be possible to predict the material temperature heating based on the specific surface color. These findings add to the evidence of general knowledge about CSA hydrates.

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CHANGES IN THE COMPOSITION AND PROPERTIES OF THE HOST ROCKS OF COAL DEPOSITS IN YAKUTIA UNDER THE INFLUENCE OF CRYOGENESIS

NEWS of National Academy of Sciences of the Republic of Kazakhstan ◽

10.32014/2020.2518-170x.113 ◽

2020 ◽

Vol 5 (443) ◽

pp. 133-140

Author(s):

Melnikov Andrey E., ◽

◽

Ze Zhang, ◽

Grib Nikolay N., ◽

Camil Jakub Shabo, ◽

...

Keyword(s):

Ultimate Strength ◽

Great Influence ◽

Physical And Mechanical Properties ◽

Strength Properties ◽

Physicomechanical Properties ◽

Freezing And Thawing ◽

Coal Deposits ◽

Host Rocks ◽

Transformation Processes ◽

Cryogenic Processes

The results of laboratory tests carried out on rock samples of the Kharbalakhskoye coalfield located in Central Yakutia revealed significant secondary changes having taken place in the host rocks containing the coal. Evidently, under transformation processes, it is not only the composition of the rocks that had changed, but also the nature of structural bonds that have a great influence on their physical and mechanical properties. Thus, the ultimate strength values of coal-containing sandstone and siltstone samples under uniaxial compression vary from 20 to 30 MPa, while under uniaxial tension, the ultimate strength values range from 6 to 10 MPa. These relatively low numerical values pertaining to the physicomechanical properties of rocks, which are generally atypical for long-flame coal deposits, are almost 50% lower than those of analogous rocks hosting other coal deposits in Russia. It is considered that the mechanical strength properties of the rocks of the Kharbalakhskoye field are due to significant cryogenic processes. A comparative analysis of the properties of core samples obtained from boreholes drilled in 2019 with samples from a quarry obtained several decades ago reveals signs of transformation of rocks in the Kharbalakhskoye field due to phase transitions of freezing and thawing water.

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