The impact of barium sulfate on the microstructural and mechanical properties of autoclaved silicate products

Stępień, Anna

doi:10.3846/enviro.2014.055

Cited by 12 publications

(9 citation statements)

References 3 publications

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“…Tobermorite (Ca 5 Si 6 O 17 *5H 2 O) is characterized by the regular lamellar shape. High strength phase formed during autocalving is present in the form of long fibers with sharp endings, visually resembling needles [8]. The XRD analysis of the examined samples has shown the existence of minerals typical for silicates in the microstructure, i.e.…”

Section: Testing Methodsmentioning

confidence: 95%

Investigation of Physico-Chemical Properties of Sand-Lime Products Modified of Diabase Aggregate and Chalcedonite Meal

Dachowski

Komisarczyk

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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In the era of rapid development in the construction industry, particular attention is focused on harmless and natural materials. Some of the best materials for building masonry walls are sand-lime products. Silicates are obtained from a mixture of quartz, sand and a small amount of water. They emerge as a result of the hydrothermal treatment conducted under high pressure and at a temperature of app. 203 °C. Silicates were modified of different kinds of aggregates, glass or plastics, and the content of dry ingredients was changed because of this fact. The paper describes the studies where the combination of diabase aggregate and chalcedonite meal was used. Microstructure of the products was analyzed with the use of mercury intrusion porosimetry, SEM and XRD methods. Variable content of chalcedonite meal changes the internal structure and the physico-chemical properties.

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Section: Testing Methodsmentioning

confidence: 95%

Investigation of Physico-Chemical Properties of Sand-Lime Products Modified of Diabase Aggregate and Chalcedonite Meal

Dachowski

Komisarczyk

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Using basalt aggregate [4], barium sulphate [5,6], lithium silicate [7] or leachate from a landfill [8] has improved properties of sand-lime products. Efforts were also made to reduce bulk density of silicates and improve their thermal insulation properties by using a light additive in the form of expanded glass granules [9,10].…”

Section: Introductionmentioning

confidence: 99%

Autoclaved Sand-Lime Products with a Polypropylene Mesh

Kostrzewa

Stępień

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The paper presents the results of the research on modifications of silicate bricks with a polypropylene mesh and their influence on physical, mechanical and microstructural properties of such bricks. The main goal of the paper was to determine effects of the polypropylene mesh on sand-lime product parameters. The analysis has focused on compressive strength, water absorption, bulk density and structural features of the material. The obtained product is characterized by improved basic performance characteristics compared to traditional silicate products. Using the polypropylene mesh increased compressive strength by 25% while decreasing the product density. The modified products retain their form and do not disintegrate after losing their bearing capacity. IntroductionStatistics on production and application of building materials in Poland, and in the world, show that consumption and demand for silicate materials have increased since the turn of the 21st century. They are not only used in Eastern and Central Europe, but also in Germany, Portugal, and the Middle East and Asian countries [1]. Such autoclaved bricks have the strength of 15-25 MPa, and are designed for constructing structural and partition walls (depending on a type), including up to 5 storeys, and in justified cases more. Civilization and technological advances force modifications in all industries, including a construction industry. By studying each type of material, its properties i.e. strength, density, water absorption and thermal properties are a priority. Such performance characteristics are due to bonds and reactions resulting from a hydration process between a binder and water. Autoclaving (hydrothermal treatment), in the case of silicate bricks, accelerates material maturation, the result of which is an artificial stone (mortar) as the end product.Crystalline phases produced in a sand-lime product depend on the whole brick production process, including mainly autoclave conditions, temperature, steam pressure, quality and proportion of constituents used, aggregate fractions and others [2,3].A modification of sand-lime product composition is a decisive factor in the technology development and leads to structural changes and performance of a product. Using basalt aggregate [4], barium sulphate [5,6], lithium silicate [7] or leachate from a landfill [8] has improved properties of sand-lime products. Efforts were also made to reduce bulk density of silicates and improve their thermal insulation properties by using a light additive in the form of expanded glass granules [9,10].In the era of sustainable development, attempts have been made to dispose of waste materials by using them as a filler in silicate products. Modifying sand-lime bricks with plastics (high impact polystyrene HIPS, and polypropylene and polyethylene PP) in the form of regranulates has improved strength, while lowering absorbability and density of finished products [11,12]. Using granular

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“…(Fig.1) The addition of liquid admixture -lithium silicate resulted in doubling of the compressive strength and reduction in water absorption by about 20%. [5,6] However, modification of white brick not always results in the improvement of their parameters. The article present the impact of admixture in the form of lithium water glass with different molar ratio on the properties of final silicate products.…”

Section: Figurementioning

confidence: 99%

The properties of doped sand-lime products

Dachowski

Komisarczyk

2016

E3S Web Conf.

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Abstract. Sand-lime products are natural materials consisting of lime, sand and water with the least content of radioactive elements in comparison to other masonry elements. They are characterized by very high compressive strength, high acoustic insulation, good thermal properties, provide a friendly atmosphere and prevent the spread of mold and bacterial flora. In addition they are fully recyclable. White bricks through the porous structure and the occurrence of capillaries have the ability to rising water. The height of capillary action is dependent on the contact angle and the size of existing pores in the material. This property affects the frost resistance and other characteristics of durability of wall materials operated under conditions of intense exposure to moisture. The aim of the study is to determine the impact modifier on the properties of autoclaved sand-lime products. For testing used autoclaved sand-lime brick dimensions 40x40x160 [mm]. The weight of the products consists of 5% lime, 90% sand and 5% lithium water glass (MP=2,6 and MP=7,0). The produced samples were subjected to autoclaving at temperatures of 203•C and pressure of 1.6 MPa in collaboration with the Silicate Production Plant in Ludynia. Three finished sets of samples (standard, modified with lithium silicate 2.6 and 7.0) have been immersed in water to the desired height during certain time. The results show the diversity of the internal structure of the tested products. In particular pore distribution, size and volume.

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The impact of barium sulfate on the microstructural and mechanical properties of autoclaved silicate products

Cited by 12 publications

References 3 publications

Investigation of Physico-Chemical Properties of Sand-Lime Products Modified of Diabase Aggregate and Chalcedonite Meal

Investigation of Physico-Chemical Properties of Sand-Lime Products Modified of Diabase Aggregate and Chalcedonite Meal

Autoclaved Sand-Lime Products with a Polypropylene Mesh

The properties of doped sand-lime products

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