Influence of stone powder content and particle size on the strength of cement-treated clay

2021 ◽  
Vol 305 ◽  
pp. 124710
Author(s):  
Joyce Nakayenga ◽  
Arlyn Aristo Cikmit ◽  
Takashi Tsuchida ◽  
Toshiro Hata
Keyword(s):  
Particle Size ◽  
Powder Content

Study on Impacting Performance of Bamboo-Plastic Composite

2012 ◽  
Vol 490-495 ◽  
pp. 3557-3561
Author(s):  
Zheng Hao Ge ◽  
Wei Bo Chen ◽  
Pu Jian Tian
Keyword(s):  
Particle Size ◽  
Injection Molding ◽  
Coupling Agent ◽  
Injection Molding Process ◽  
Molding Process ◽  
Plastic Composite ◽  
Size Type ◽  
Bamboo Powder ◽  
Powder Content

In order to research impacting strength of bamboo-plastic composite from bamboo powder content, particle size, type of coupling agent, etc. The bamboo-plastic composite is made of extrusion and injection molding process. Results show: when bamboo powder content is 30%, impacting strength of the material is the highest; the bamboo-plastic composite which made of Silane and MAPE has higher impacting strength than others; when PP: HDPE = 2:3, the impacting strength of the bamboo-plastic composite is the highest. Compared with these factors, the coupling agent on impacting strength is the most obvious influence.

scholarly journals Studies on the Transport of Aromatic Solvents through Filled Natural Rubber

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Isaac O. Igwe ◽  
Obumneme E. Ezeani
Keyword(s):  
Particle Size ◽  
Weight Gain ◽  
Natural Rubber ◽  
Activation Energies ◽  
Free Energies ◽  
Snail Shell ◽  
Aromatic Solvents ◽  
Benzene Toluene ◽  
Powder Content ◽  
Shell Powder

The transport of three aromatic solvents (benzene, toluene and xylene) through snail shell powder filled natural rubber was studied at 313, 333, and 353 K by conventional weight-gain experiments. The effects of snail shell powder content, particle size, nature of solvent, and temperature on the transport characteristics of natural rubber were determined. The estimated Arrhenius activation energies for the processes of sorption, diffusion, and permeation showed that the activation energies were highest in xylene at all the filler contents investigated. The calculated enthalpies, and entropies of sorption were all positive for the solvents investigated. Similarly, the change in the estimated free energies of sorption were all positive; an indication of the non-spontaneity of the solubility of snail shell powder filled natural rubber in the aromatic solvents at 313 k.

Synthesis of Apatite Ceramics with Bimodal Pore Structure Using Mechanochemically Prepared Fine Apatite Powder

2007 ◽  
Vol 280-283 ◽  
pp. 1571-1574 ◽  
Author(s):  
Yin Zhang ◽  
Yoshiyuki Yokogawa ◽  
Tetsuya Kameyama
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Pore Structure ◽  
Bending Strength ◽  
Mechanochemical Method ◽  
Organic Form ◽  
Sem Observation ◽  
Hydroxyapatite Powder ◽  
Powder Content ◽  
Bimodal Pore Structure

Preparation of apatite ceramics with bimodal pore structure was studied. First fine hydroxyapatite powder was obtained through mechanochemical method. The particle size of the product was around 0.64 µm. The slurry with the fine apatite powder content of 55-62.5wt% was prepared using defloculant, and foaming reagent. The organic form was immersed into the slurry, dried under vacuum, and heated at 1100°C, 1200°C, 1300°C. Pore size distribution of the product measured by porosimeter showed that small pores of around 1 µm and large pores of 100 µm exist, and SEM observation confirmed. SEM observation showed that the large pores seemed to be interconnected through the openings of several dozens µm in size. The porosity of the products were found to be 48 – 58.5%, and the bending strength of the products obtained by heat-treatment at 1100°C for 3 hours was 5.6 MPa, and that at 1200°C was 10.5 MPa.

Effects of Na-Ca System Glass Powder on Properties of Silver Paste

2013 ◽  
Vol 833 ◽  
pp. 295-300
Author(s):  
Mao Yan Fan ◽  
Guo You Gan ◽  
Jian Hong Yi ◽  
Ji Kang Yan ◽  
Jing Hong Du ◽  
...  
Keyword(s):  
Particle Size ◽  
Glass Powder ◽  
Silver Film ◽  
Sintering Temperature ◽  
Holding Time ◽  
Binder Phase ◽  
Powder Size ◽  
Silver Paste ◽  
Powder Content

The glass powder as a binder phase in the silver paste mainly plays the role of binding. The composition, content and particle size of the glass powder have significant effects on the properties of the silver paste. In this paper, the effects of the sintering temperature, holding time, glass powder content and glass powder size on the adhesion and square resistance of the silver film were studied. The research results showed that when the glass powder content was 6%(in mass) of the total silver paste, the sintering temperature was 680°C, the holding time was 7 minutes and the glass powder size was 2.47μm, the silver paste can get good properties. The adhesion strength and square resistance of the silver film were respectively 2.5 N/mm2 and 14 mΩ /.

scholarly journals Submicron SiO2 Powder: Characterization and Effects on Properties of Cement-Free Iron Ditch Castables

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Shuiming Cheng ◽  
Huizhong Zhao ◽  
Yu Wang ◽  
Jianxiu Wei ◽  
Jinfeng Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Bending Strength ◽  
Raw Materials ◽  
Rate Of Change ◽  
Free Iron ◽  
New Type ◽  
Sio2 Powder ◽  
Powder Content

Submicron materials are those with particle size diameters between 0.1 and 1 μm. Submicron SiO2 generally refers to SiO2 powder with a D90 < 1 μm (D90 refers to the particle size distribution exhibited by the sample and corresponds, in this case, to 90% of the particles not exceeding a diameter of 1 μm). In this study, a new type of cement-free iron ditch castable was prepared using dense corundum and silicon carbide as the primary raw materials with submicron SiO2 powder as the binder. The effects of submicron SiO2 powder content on the bulk density, apparent porosity, linear rate of change, compressive strength, and bending strength were investigated. The mechanism of action of the submicron SiO2 powder was also investigated by analyzing its microstructure and particle size distribution. The results revealed that (1) the submicron SiO2 powder can be used as the sole bonding agent in the preparation of cement-free iron ditch castables; (2) in comparison to traditional castables, the cement-free castable developed in this study demonstrated strong service performance and high-temperature bending strength.

Effect of Slate Powder on Alkali Activity of Slate Aggregate

2013 ◽  
Vol 275-277 ◽  
pp. 2124-2130 ◽  
Author(s):  
Xian Xiao Peng ◽  
Gu Hua Li ◽  
Wu Huang ◽  
Fu Hai Li ◽  
Xiao Chun He
Keyword(s):  
Particle Size ◽  
Adverse Effects ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Downward Trend ◽  
Alkali Aggregate Reaction ◽  
Accelerated Mortar Bar Test ◽  
Bar Test ◽  
Mortar Bar ◽  
Powder Content

In order to study the effect of manufactured-sand’s feature on the alkali activity of slate aggregate, refer to the accelerated mortar bar test in the “Standard for Constructional Quality Acceptance of Railway Concrete Engineering” TB 10424-2010. The text has studied the expansion of the specimens that are made from slate aggregate with different powder contents or different particle size distribution. The results show that: When the content of powder in slate aggregate is less than 10%, the powder dose not have adverse effects on the expansion of specimens, and when the powder content is 15% to 20%, the expansion has downward trend. Slate powder is an active powder. It can not suppress the alkali-aggregate reaction of slate aggregate, but it can reduce the expansion of specimens. Particle size has influence on the expansion of specimens. The most unfavorable particle size of slate aggregate for the alkali activity is 0.16~0.315(mm).

Microstructural characterization of laser-melted/roller-quenched dicalcium silicate

1988 ◽  
Vol 46 ◽  
pp. 582-583
Author(s):  
C. J. Chan ◽  
K. R. Venkatachari ◽  
W. M. Kriven ◽  
J. F. Young
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Shape Change ◽  
Microstructural Characterization ◽  
Particle Size Effect ◽  
Dicalcium Silicate ◽  
Laser Melting ◽  
Uniform Size ◽  
Cell Shape Change ◽  
Wide Range

Dicalcium silicate (Ca2SiO4) is a major component of Portland cement. It has also been investigated as a potential transformation toughener alternative to zirconia. It has five polymorphs: α, α'H, α'L, β and γ. Of interest is the β-to-γ transformation on cooling at about 490°C. This transformation, accompanied by a 12% volume increase and a 4.6° unit cell shape change, is analogous to the tetragonal-to-monoclinic transformation in zirconia. Due to the processing methods used, previous studies into the particle size effect were limited by a wide range of particle size distribution. In an attempt to obtain a more uniform size, a fast quench rate involving a laser-melting/roller-quenching technique was investigated.The laser-melting/roller-quenching experiment used precompacted bars of stoichiometric γ-Ca2SiO4 powder, which were synthesized from AR grade CaCO3 and SiO2xH2O. The raw materials were mixed by conventional ceramic processing techniques, and sintered at 1450°C. The dusted γ-Ca2SiO4 powder was uniaxially pressed into 0.4 cm x 0.4 cm x 4 cm bars under 34 MPa and cold isostatically pressed under 172 MPa. The γ-Ca2SiO4 bars were melted by a 10 KW-CO2 laser.

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

Sign in / Sign up

Export Citation Format

Share Document