Thermal analysis of high-performance mortar containing burnt clay shale as a partial portland cement replacement in the temperature range up to 1000 °C

2016 ◽  
Vol 41 (1) ◽  
pp. 54-64 ◽  
Author(s):  
Anton Trník ◽  
Lenka Scheinherrová ◽  
Tereza Kulovaná ◽  
Pavel Reiterman ◽  
Eva Vejmelková ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Portland Cement ◽  
High Performance ◽  
Clay Shale ◽  
Cement Replacement ◽  
Temperature Range ◽  
Burnt Clay

Effect of Porosity on Mechanical and Hygric Properties of Concrete with Natural Pozzolan Addition

2014 ◽  
Vol 982 ◽  
pp. 22-26 ◽  
Author(s):  
Tereza Kulovaná ◽  
Pavla Rovnaníková ◽  
Zbyšek Pavlík ◽  
Robert Černý
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Moisture Transport ◽  
High Performance ◽  
High Performance Concrete ◽  
Moisture Diffusivity ◽  
Natural Pozzolan ◽  
Cement Replacement ◽  
Hygric Properties ◽  
Partial Cement Replacement

Effect of porosity on mechanical and hygric properties of high performance concrete (HPC) with natural pozzolan as partial Portland cement replacement up to 40% is studied in the paper. The reference HPC mixture is researched as well in order to evaluate the influence of pozzolan usage on concrete performance. For the studied materials, measurement of compressive strength, sorptivity, apparent moisture diffusivity, and water vapor diffusion permeability is done. The obtained data shows that application of the pozzolan as partial cement replacement leads to increase of concrete porosity that is related to the lower mechanical strength and higher moisture transport properties. Therefore, the applied natural pozzolan has a potential to replace a part of Portland cement in concrete manufacturing but its content in concrete mixture has strict limitations.

An alkali metal–selenium battery with a wide temperature range and low self-discharge

2019 ◽  
Vol 7 (38) ◽  
pp. 21774-21782 ◽  
Author(s):  
Xiaosen Zhao ◽  
Lichang Yin ◽  
Zhenzhen Yang ◽  
Gang Chen ◽  
Huijuan Yue ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Alkali Metal ◽  
Wide Temperature Range ◽  
High Performance ◽  
Temperature Range

A high performance alkali metal–selenium battery with a wide temperature range was obtained by the synergistic effect of microporous fixation and heteroatom adsorption.

scholarly journals Thermal Properties of High-Performance Concrete Containing Fine-Ground Ceramics as a Partial Cement Replacement

2015 ◽  
Vol 21 (3) ◽  
Author(s):  
Lenka Scheinherrová ◽  
Anton Trník ◽  
Tereza Kulovaná ◽  
Pavel Reiterman ◽  
Igor Medveď ◽  
...  
Keyword(s):  
Thermal Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Cement Replacement ◽  
Partial Cement Replacement

scholarly journals Re-weathering of stabilized clay shale with Portland cement behavior

2019 ◽  
Vol 276 ◽  
pp. 05009
Author(s):  
Alatas Idrus M ◽  
Simatupang Pintor T ◽  
Kuswaya Wawan ◽  
Panji
Keyword(s):  
Shear Strength ◽  
Portland Cement ◽  
Ratio Test ◽  
Natural Clay ◽  
Durability Test ◽  
Clay Shale ◽  
Process Testing ◽  
High Shear Strength ◽  
Very High ◽  
Weathering Process

Clay shale is a claystone which in fresh condition has a very high shear strength. When it reacts with the atmosphere or hydrosphere it will weather so that the shear strength of clay shale will drop drastically. The weathering potential of clay shale is generally done by the slake durability test and the weathering process is measured by disintegration ratio test (DR). The strength of clay shale that has fully weathered will increase again when it is stabilized with a minimum of 6% PC (Portland Cement). It was found from the wetting drying cycle process testing that durability of re-weathering of stabilized clay shale with PC is increased compared to natural clay shale. Disintegration ratio of natural clay shale DR was smaller than stabilized clay shale with 6% PC. Additionally, more than 6% PC increased the durability of re-weathering of clay shale.

Properties of self-leveling mortars incorporating a high-volume of sugar cane bagasse ash as partial Portland cement replacement

2020 ◽  
Vol 32 ◽  
pp. 101694
Author(s):  
Marcos A.S. Anjos ◽  
Tomaz R. Araújo ◽  
Ruan L.S. Ferreira ◽  
Evilane C. Farias ◽  
Antonio E. Martinelli
Keyword(s):  
Portland Cement ◽  
Sugar Cane ◽  
High Volume ◽  
Sugar Cane Bagasse ◽  
Cement Replacement ◽  
Sugar Cane Bagasse Ash

Thermal Analysis of Iron Sulfides at the Temperature Range of β-transformation

1954 ◽  
Vol 9 (4) ◽  
pp. 500-502 ◽  
Author(s):  
Tokutarō Hirone ◽  
Seijirō Maeda ◽  
Shu Chiba ◽  
Noboru Tsuya
Keyword(s):  
Thermal Analysis ◽  
Iron Sulfides ◽  
Temperature Range

High Performance Concrete with Ternary Binders

2018 ◽  
Vol 761 ◽  
pp. 120-123 ◽  
Author(s):  
Vlastimil Bílek ◽  
David Pytlík ◽  
Marketa Bambuchova
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Silica Fume ◽  
High Performance ◽  
Ordinary Portland Cement ◽  
High Performance Concrete ◽  
Fresh Concrete ◽  
Binder Ratio ◽  
Water To Binder Ratio ◽  
Condensed Silica Fume

Use a ternary binder for production of a high performance concrete with a compressive strengths between 120 and 170 MPa is presented. The water to binder ratio of the concrete is 0.225 and the binder is composed of Ordinary Portland Cement (OPC), condensed silica fume (CSF), ground limestone (L), fly ash (FA) and metakaoline (MK). The dosage of (M + CSF) is kept at a constant level for a better workability of fresh concrete. Different workability, flexural and compressive strengths were obtained for concretes with a constant cement and a metakaoline dosage, and for a constant dosage (FA + L) but a different ratio FA / L. An optimum composition was found and concretes for other tests were designed using this composition.

Thermal Analysis of Nomex® and Kevlar® Fibers

1977 ◽  
Vol 47 (1) ◽  
pp. 62-66 ◽  
Author(s):  
J. R. Brown ◽  
B. C. Ennis
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Glass Transition ◽  
Melting Point ◽  
Transition Region ◽  
High Temperatures ◽  
High Performance ◽  
Polymer Melt ◽  
Glass Transition Region ◽  
Dta Curves

DTA, TG, and TMA curves of commercial Kevlar® 49 and Nomex® fibers have been used to assess their behavior at high temperatures. The fibers lost absorbed water around 100°C, and a glass transition was reflected in the DTA and TMA curves in the region of 300°C. Difficulties in the interpretation of DTA and TMA curves in the glass-transition region and in the assignments of Tv‘s for these high-performance fibers are discussed. Whereas Kevlar 49 showed both a crystalline melting point (560°C) and a sharp endothermal thermal decomposition (590°C), Nomex showed only the latter (440°C) and no evidence of melting from the DTA curves. The endothermal decomposition peaks apparently correspond to “polymer melt temperatures” reported for related materials, and correlate well with the TG and TMA features. During thermal analysis of Kevlar 49, oxidation occurs more readily than thermal decomposition, but the latter predominates for Nomex. Differences between dyed and undyed Nomex were due to differences in yarn constitution.

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