scholarly journals The Influence of Bleeding of Cement Suspensions on Their Rheological Properties

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1609 ◽  
Author(s):  
Tabea von Bronk ◽  
Michael Haist ◽  
Ludger Lohaus
Keyword(s):  
Rheological Properties ◽  
Cement Paste ◽  
Great Influence ◽  
Compaction Process ◽  
Measuring Procedure ◽  
Sedimentation Behavior ◽  
Segregation Phenomenon ◽  
The Difference ◽  
Mixing Water

Flowable concretes tend to segregate. The risk of segregation is particularly high when the concrete is vibrated during the compaction process. A well-known segregation phenomenon is the so-called “bleeding”. This is a rise of water to the surface of the freshly poured concrete due to the difference in density between the mixing water and the concrete’s denser solid components (aggregates, cement and additives). This type of segregation occurs particularly within the paste. The focus of this paper is, therefore, on the sedimentation behavior at the microscale of concrete and especially on the influence of this process on rheological properties of the cement paste. In addition to common bleeding tests of cement suspensions using standing cylinders, rheometric measurements were performed on the suspensions during the bleeding process. A measuring procedure was developed for the rheometric measurements of the sedimenting cement suspensions. The rheological properties of the investigated cement suspensions were determined at four specific measuring times and at four specific measuring heights (i.e., positions) each. With this method it could be shown that the cement suspensions are not homogeneous over their height and that bleeding has a great influence on the rheological properties of cement suspension.

scholarly journals The Influence of Chosen Factors on the Rheological Properties of Cement Paste

2015 ◽  
Vol 108 ◽  
pp. 568-574 ◽  
Author(s):  
Alina Kaleta ◽  
Stefania Grzeszczyk
Keyword(s):  
Rheological Properties ◽  
Cement Paste

Analysis on Kinematic Characteristics of Precision Balls Grinding

2012 ◽  
Vol 497 ◽  
pp. 20-24
Author(s):  
Yong Dai ◽  
Dong Hui Ding ◽  
Xu Xiao ◽  
Xue Shi Liu ◽  
Rui Jiang He ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Great Influence ◽  
Processing Parameters ◽  
Important Influence ◽  
Normal Movement ◽  
Motion State ◽  
Kinematic Characteristics ◽  
The Difference

In the process of grinding precision balls, the motion state of balls has an important influence on the efficiency and quality. However, the normal movement of balls will be damaged because of slipping, so it must be avoided. Besides, to process different materials of balls, it should use different processing parameters. This paper studies a numerical analysis on the kinematic characteristics of the motion of balls, analyzes processing parameters which impact the motion of balls during grinding and the difference of the motion state of bearing balls and resin balls. Study shows grinding pressure and plate speed have a great influence to the motion of balls during grinding.

Test Methods for Rheological Properties of Self-Compacting Concrete Pastes

2011 ◽  
Vol 338 ◽  
pp. 396-400
Author(s):  
Bao Guo Ma ◽  
Hui Xian Wang ◽  
Jian Huang ◽  
Liu Qing Song
Keyword(s):  
Rheological Properties ◽  
Cement Paste ◽  
Test Methods ◽  
General Study ◽  
Self Compacting Concrete ◽  
Cement Pastes ◽  
Different Types ◽  
Over Time

This paper provides a general study on cement paste flow which derived from self- compacting concretes. Rheometer, Marsh cone and mini-slump cone were used to evaluate fluidity of cement pastes containing superplasticizers of different types and dosages and loss of fluidity over time. There is a superplasticizer saturation dosage beyond which no significant fluidity increase can be found. This paper evaluated the effect of these three methods using rheometer as control and the optimum superplasticizer type for the preparation of self-compacting concrete was suggested.

Rheological Properties of Cement Paste Blended Blast Furnace Slag or Fly Ash Powder

2008 ◽  
Vol 45 (6) ◽  
pp. 336-344 ◽  
Author(s):  
Jong-Taek Song ◽  
Hyo-Sang Park ◽  
Seung-Ho Byun ◽  
Dong-Woo Yoo
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Rheological Properties ◽  
Cement Paste ◽  
Blast Furnace Slag ◽  
Furnace Slag

The effect of measuring procedure on the apparent rheological properties of self-compacting concrete

2002 ◽  
Vol 32 (11) ◽  
pp. 1791-1795 ◽  
Author(s):  
Mette R Geiker ◽  
Mari Brandl ◽  
Lars N Thrane ◽  
Dirch H Bager ◽  
Olafur Wallevik
Keyword(s):  
Rheological Properties ◽  
Self Compacting Concrete ◽  
Measuring Procedure

scholarly journals Soil-concrete for use in the 3D printers in the construction of buildings and structures

2018 ◽  
Vol 245 ◽  
pp. 03002 ◽  
Author(s):  
Petr Iubin ◽  
Lubov Zakrevskaya
Keyword(s):  
Rheological Properties ◽  
Cement Paste ◽  
Clay Soil ◽  
Cement Composite ◽  
Cement Composites ◽  
Test Results ◽  
Flow Table ◽  
Key Factor ◽  
3D Printers ◽  
The Cost

Nowadays, the construction of cement composite using 3D printers is considered one of the most promising methods of automation of building processes. However, the compositions of cement composites have several disadvantages, such as high cost, short workability and etc. It has been suggested that clay soil as an additive will help to solve these problems partially. The aim of the work is development the cement compositions with clay soil, for use in 3D printers to construction. The composite consists of cement paste with clay soil and additives. To study printability of a composite the rheological properties in a fresh state were studied. The study of the rheological properties of composites was carried out using a flow table test for mortar. The key factor for determining the suitability of the composite for printing was accepted the diameter of the cone after shaking. The test results showed the possibility of replacing cement paste with clay soil up to 25% which leads to a reduction in the cost and an increase in printability with a slight decrease in the strength of the obtained material to 7%. Utilizing of soil from the construction site provides maximum economic efficiency of the material application.

The Chinese script, Confucian script, and Nôm script: Some reflections on writing and politics in monarchical Vietnam

2020 ◽  
Vol 4 (3) ◽  
pp. 146-160
Author(s):  
Tuấn-Cường Nguyễn ◽  
Anh-Chưởng Bùi
Keyword(s):  
Chinese Culture ◽  
Great Influence ◽  
Chinese Script ◽  
Writing System ◽  
Dominant Form ◽  
Independent State ◽  
The Core ◽  
Chinese Model ◽  
The Difference ◽  
Education And Employment

“Confucian script” 儒字 (chữ Nho) has become a unique name used to refer to the “Chinese script” 漢字 (chữ Hán) in Vietnamese. The integration between Chinese script and Confucianism had progressed through monarchical centuries, motivated by Vietnam’s political tradition. Supported by rulers of the country, Chinese script overwhelmed the difference of languages, became the official writing system, and therefore held great influence on important activities of government such as administration, diplomacy, education, and employment. By looking carefully at how Vietnamese monarchs managed to manipulate the Chinese script, Nôm script, and Confucianism to serve their political purposes, we stress that it was Confucianism that served as the link tying the Chinese script with Vietnamese rulers. This link was so strong that the Chinese script remained the dominant form of writing even with the invention of the “Nôm script” 喃字 (chữ Nôm), which was a vernacular system developed to write the Vietnamese language. Furthermore, because Confucianism itself was the spiritual core of the Chinese monarchical structure, Vietnamese rulers learned from the Chinese model by way of the Chinese script when building their own independent state. Confucianism was viewed as the core of Chinese culture.

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