Lubrication layer properties during concrete pumping

Product Related Information

  • Pipe flow of pumping wet shotcrete based on lubrication …

    30/6/2016 · Myoungsung C, Roussel N, Kim Y, Kim J (2013) Lubrication layer properties during concrete pumping. Cem Concr Res 45:69–78 Article Google Scholar Roussel N (2006) A thixotropy model for fresh fluid concretes: theory validation and Article

    GET A QUOTE
  • Estimation of the Pumping Pressure from Concrete …

    Kim, and J. Kim, "Lubrication layer properties during concrete pumping," Cement and Concrete Research, vol. 45, no. 1, pp. 69 "Use of tribometer to estimate interface friction and concrete boundary layer composition during the fluid concrete pumping,"

    GET A QUOTE
  • Changes in fresh properties of flowable concrete …

    We are not allowed to display external PDFs yet. You will be redirected to the full text document in the repository in a few seconds, if not click here.

    GET A QUOTE
  • Estimation of Lubrication Layer Thickness and …

    fresh concrete properties are affected in diverse ways by pumping, with the results being dependent on the concrete fresh properties, and pumping parameters. Additionally, an attempt was performed to reverse engineer the composition of the so called "lubrication

    GET A QUOTE
  • Changes in fresh properties of flowable concrete induced by pumping and composition of the lubrication layer

    fresh concrete properties are affected in diverse ways by pumping, with the results being dependent on the concrete fresh properties, and pumping parameters. Additionally, an attempt was performed to reverse engineer the composition of the so called "lubrication

    GET A QUOTE
  • Formation of lubricating layer and flow type during …

    1/6/2018 · This study quantifies the changes in the rheological properties of fresh concrete while focusing on lubricating layer (LL) formation during pumping. Full-scale pumping experiments were carried out on ready-mix concrete accompanied by the state-of-the-art rheological tests. Pumping markedly increased the yield stress.

    GET A QUOTE
  • Lubrication layer properties during concrete pumping - …

    Lubrication layer properties during concrete pumping :Cement and Concrete Research :Myoungsung Choi; Nicolas Roussel; Youngjin Kim; Jinkeun Kim :2013

    GET A QUOTE
  • Lubrication layer properties during concrete pumping - …

    11/6/2020 · 1 Introduction Concrete pumping is extensively used worldwide for the construction of high rise buildings and long span bridges. This technique offers notable advantages such as allowing concrete casting in difficult to access locations, and reducing casting process durations or allowing for a continuous concrete casting.

    GET A QUOTE
  • Changes in concrete properties during pumping and …

    Pumping of concrete mixtures: rheology, lubrication layer properties and pumping pressure assessment. Pumping is the most utilized placement technique to deliver fresh concrete from the concrete mixer to the formwork on construction site. Compared to other available placement methods, such as bucket-and-crane or conveyor belts, pumping offers

    GET A QUOTE
  • Changes in fresh properties of flowable concrete induced by …

    The concrete pump is often used in commercial construction and is particularly helpful where access is difficult (for example, in tunnels). However, concrete pumping remains to date an empirical, trial-and-error process, involving frequent troubleshooting on construction sites.

    GET A QUOTE
  • Pumping of Fresh Concrete: Insights and Challenges

    4 Lubrication layer formation While pumping, the fresh concrete does not remain homogenous, due to the formation of a lubrication layer near the pipe wall (sometimes also misleadingly called 'slip layer' while no slip between concrete and surface occurs

    GET A QUOTE
  • Effects of Ultrafine Powders on the Properties of the …

    The friction at the steel pipe–flowing concrete interface plays an important role in concrete pumpability. To reduce the friction or improve pumpability, in this paper, various ultrafine powders (nanoclay, nano-CaCO 3, and microsized marble powder) are incorporated into a highly flowable concrete mixture with a low water-binder ratio (w / b = 0.35) at a dosage of 1% (by weight) as a cement

    GET A QUOTE
  • Publications | George Scherer's Materials Research …

    Myoung Sung Choi, Nicolas Roussel, Young Jin Kim, Jin Keun Kim, "Lubrication layer properties during concrete pumping", Cement and Concrete Research, 45 (2013) 69-78. 6. Myoung Sung Choi, Young Jin Kim, Seung Hee Kwon, "Prediction on pipe flow of pumped concrete based on shear-induced particle migration", Cement and Concrete Research, 52 (2013) 216-224.

    GET A QUOTE
  • Effects of an externally imposed electromagnetic field on the form…

    1/3/2013 · In order to progress in the understanding of the physical phenomena involved in the pumping process of concrete, we study in this work the properties of the lubrication layer, which forms between the pipe and the bulk material. Using ultrasonic velocity profiler, we measure the thickness of this lubrication layer in the case of real size pumping

    GET A QUOTE
  • Pumping of concrete mixtures: rheology, lubrication layer …

    steeply grows in a thin layer, called lubrication layer,showing a thickness of about 2 mm. The mortar in thislayer, with lower yield stress and lower viscosity thanthe bulk concrete, is highly

    GET A QUOTE
  • Lubrication layer properties during concrete pumping - …

    Lubrication layer properties during concrete pumping :Cement and Concrete Research :Myoungsung Choi; Nicolas Roussel; Youngjin Kim; Jinkeun Kim :2013

    GET A QUOTE
  • Pumping of Fresh Concrete: Insights and Challenges

    4 Lubrication layer formation While pumping, the fresh concrete does not remain homogenous, due to the formation of a lubrication layer near the pipe wall (sometimes also misleadingly called 'slip layer' while no slip between concrete and surface occurs

    GET A QUOTE
  • Research on Pump Primers for Friction Reduction of Wet …

    5/3/2017 · And recently hot discussion about the pumping concrete mainly focuses on the lubricating layer and different assessment techniques to determine the properties of lubricating layer in the pumping process, including rheological measurement, UVP (ultrasonic5, 6].

    GET A QUOTE
  • Assessment and prediction of concrete flow and …

    1/3/2020 · Abstract. In work at hand, a site suitable, scientifically-based methodology to characterise and predict fresh concrete pumping behaviour was developed and verified. The properties of the lubricating layer (LL) formed during pumping and consequently reducing the friction at the pipe wall-to-concrete interface were investigated and quantified.

    GET A QUOTE
  • Effects of Ultrafine Powders on the Properties of the …

    The friction at the steel pipe–flowing concrete interface plays an important role in concrete pumpability. To reduce the friction or improve pumpability, in this paper, various ultrafine powders (nanoclay, nano-CaCO 3, and microsized marble powder) are incorporated into a highly flowable concrete mixture with a low water-binder ratio (w / b = 0.35) at a dosage of 1% (by weight) as a cement

    GET A QUOTE