Influence of Different Grinding Types on Granulometry of Cement Grains

2014 ◽  
Vol 897 ◽  
pp. 34-38 ◽  
Author(s):  
Karel Dvořák
Keyword(s):  
Portland Cement ◽  
Ball Mill ◽  
High Speed ◽  
Cement Grinding ◽  
Shape And Size

This work is opening study in issue of potential utilization of high-speed shredder for portland cement grinding. The article deals with comparison the influence of traditional ball mill with high-speed shredder on shape and size of grains.

Effect of Ageing Period on Properties of Mechanically Activated Portland Cement

2018 ◽  
Vol 760 ◽  
pp. 37-42
Author(s):  
Karel Dvořák ◽  
Matěj Švéda
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Mechanical Activation ◽  
Aging Time ◽  
Ball Mill ◽  
High Speed ◽  
Aging Period ◽  
High Speed Grinding ◽  
Ageing Period ◽  
The Moment

This experiment describes the effects of the aging time since the moment of milling to Portland cements physico-mechanical properties. Possible mechanical activation effects to Portland cement particles has been found. For this experiment two kind of milling technology were used, the conventional milling in a ball mill and high-speed grinding technology in high speed disintegrator and influence of these technologies was also described. The aging period of the cement influences in particular physico-mechanical properties in the early stages of hydration but the final properties after 28 days were not influenced.

Estimation of Portland cement mortar compressive strength using microcores. Influence of shape and size

2014 ◽  
Vol 55 ◽  
pp. 359-364 ◽  
Author(s):  
F.J. Alejandre ◽  
V. Flores-Alés ◽  
R. Villegas ◽  
J. García-Heras ◽  
E. Morón
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Cement Mortar ◽  
Shape And Size

Investigation of Burr on Strips Cast by Vertical-Type High-Speed Twin Roll Caster

2020 ◽  
Vol 831 ◽  
pp. 40-45 ◽  
Author(s):  
Toshio Haga ◽  
Takuya Yamashiki ◽  
Hisaki Watari ◽  
Shinichi Niahida
Keyword(s):  
High Speed ◽  
Lower Edge ◽  
Strip Surface ◽  
Factors Affecting ◽  
Twin Roll Caster ◽  
Si Content ◽  
Twin Roll ◽  
Shape And Size

The factors affecting the shape and size of burrs that form at the edges of strips cast by a vertical type twin roll caster were investigated in this study. The size of the burr was found to be affected by the Si content of the strip. When the Si content was larger than 7 mass%, the burrs became larger. The position of the lower edge of the side dam plate also affected the shape of the burr. The burrs that formed were generally perpendicular to the strip surface but changed to being parallel to the strip surface as the position of the lower edge of the side dam plate was displaced upward from the center of the rolls.

scholarly journals Geopolymer Based on Mechanically Activated Air-cooled Blast Furnace Slag

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1134 ◽  
Author(s):  
Ilda Tole ◽  
Magdalena Rajczakowska ◽  
Abeer Humad ◽  
Ankit Kothari ◽  
Andrzej Cwirzen
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Portland Cement ◽  
Sodium Silicate ◽  
Blast Furnace Slag ◽  
Ball Mill ◽  
Efficient Solution ◽  
Building Materials ◽  
Furnace Slag ◽  
Alkali Activated

An efficient solution to increase the sustainability of building materials is to replace Portland cement with alkali-activated materials (AAM). Precursors for those systems are often based on water-cooled ground granulated blast furnace slags (GGBFS). Quenching of blast furnace slag can be done also by air but in that case, the final product is crystalline and with a very low reactivity. The present study aimed to evaluate the cementitious properties of a mechanically activated (MCA) air-cooled blast furnace slag (ACBFS) used as a precursor in sodium silicate alkali-activated systems. The unreactive ACBFS was processed in a planetary ball mill and its cementing performances were compared with an alkali-activated water-cooled GGBFS. Mixes based on mechanically activated ACBFS reached the 7-days compressive strength of 35 MPa and the 28-days compressive strength 45 MPa. The GGBFS-based samples showed generally higher compressive strength values.

Performance of Cement Systems with Nano-SiO2 Particles Produced Using Sol-gel Method

2010 ◽  
Vol 1276 ◽  
Author(s):  
Konstantin Sobolev ◽  
Ismael Flores ◽  
Leticia M. Torres ◽  
Enrique L. Cuellar ◽  
Pedro L. Valdez ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Composite Materials ◽  
Portland Cement ◽  
High Speed ◽  
Essential Role ◽  
Sol Gel ◽  
Strength Development ◽  
Cement Mortars ◽  
Effective Dispersion ◽  
Dispersion Of Nanoparticles

AbstractThe reported research examines the effect of 5–70 nm SiO2 nanoparticles on the mechani-cal properties of nanocement materials. The strength development of portland cement with nano-SiO2 and superplasticizing admixture is investigated. Experimental results demonstrate an in-crease in the compressive strength of mortars with SiO2nanoparticles. The distribution of nano-SiO2 particles within the cement paste plays an essential role and governs the overall perfor-mance of these products. Therefore, the addition of a superplasticizer is proposed to facilitate the distribution of nano-SiO2 particles. The application of effective superplasticizer and high-speed dispergation are found to be very effective dispersion techniques that improve the strength of su-perplasticized portland cement mortars, reaching up to 63.9 MPa and 95.9 MPa after aging dur-ing 1 and 28 days, respectively. These values compare favorably with the observed compressive strengths of reference portland cement mortars of 53.3 MPa and 86.1 MPa. It is concluded that the effective dispersion of nanoparticles is essential to obtain the composite materials with im-proved performance.

Research on MR Active Damping Control in Large-Diameter High-Speed Ball Mill

2010 ◽  
Vol 43 ◽  
pp. 110-113
Author(s):  
Qi Dong Chen ◽  
Yan Nian Rui ◽  
Xiao Mei Jiang ◽  
Ming Shen
Keyword(s):  
Computer Simulation ◽  
Active Control ◽  
Ball Mill ◽  
High Speed ◽  
Large Diameter ◽  
Mr Damper ◽  
Vibration Damping ◽  
Damping Control ◽  
Mr Damping ◽  
Control Principle

In this paper, MR damping mechanism is used to solve the vibration damping difficulties caused by the nonlinear vibration of ball mill. Dynamic model of MR Damper is constructed to design the damper of ball mill through research. Fuzzy control principle is adopted for active control of the MR damper and satisfactory results are obtained through computer simulation.

Study of Solutions and Causes for Scrap Jumping up in High-Speed Stamping

2011 ◽  
Vol 189-193 ◽  
pp. 2625-2628
Author(s):  
Hong Lin Li ◽  
Ting Xiao Tang
Keyword(s):  
Material Properties ◽  
High Speed ◽  
Manufacturing Processes ◽  
Press Tool ◽  
Sheet Metal Stamping ◽  
The Press ◽  
Metal Stamping ◽  
Die Material ◽  
Relevant Factors ◽  
Shape And Size

High-speed sheet metal stamping is popular because it is economical and quick means of producing intricate, accurate and durable components in large quantities. Scrap jumping up is one problem which usually occurs in high-speed stamping manufacturing processes. In this paper, the relevant factors are analyzed and studied such as the press tool, the shape and size of the stamping pieces, the structure and rigidity of pressing die, the clearance between punch and die, material properties of the blank, etc. Then ten cases are summarized that lead to scrap jumping up. For each case, corresponding solution is presented to avoid the scrap jumping up.

scholarly journals NANOINDENTATION AND ACCELERATED PROPERTY MAPPING OF PORTLAND CEMENT PASTE

2020 ◽  
Vol 27 ◽  
pp. 96-100
Author(s):  
Jiří Němeček ◽  
Jiří Němeček ◽  
Jaroslav Lukeš
Keyword(s):  
Portland Cement ◽  
Cement Paste ◽  
High Speed ◽  
High Strain ◽  
Acquisition Time ◽  
Strain Effect ◽  
Innovative Method ◽  
Reduced Modulus ◽  
One Year ◽  
Portland Cement Paste

This paper presents a new nanoindentation mode: accelerated property mapping (XPM) applied to one year old Portland cement paste. The principle of the innovative method is similar to classical quasi-static nanoindentation but the time necessary for performing one indent is significantly decreased from minutes to tenths of seconds. The XPM mode is capable of measuring maps of local mechanical properties (reduced modulus, hardness). The method was compared to classical nanoindentation mode. The main advantages of XPM measurement are higher spatial resolution, lower property fluctuation and lower acquisition time. However, XPM is not able to measure some parameters such as creep. Also, high speed loading of XPM brings high strain effect which artificially shifts values of reduced modulus to higher values compared to quasi-static loading cases.

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