Pumping Behaviour of Modern Concretes Related Information

Rod Pumping System - an overview | ScienceDirect Topics

Sucker rod pumping systems are the oldest and most widely used type of artificial lifting system for oil wells. Figure 5.13 shows a schematic of a rod pumping system. Sucker-rod pumping is the most widely used artificial lift method for onshore oil wells. Sucker-rod strings transfer the motion from the driving machine on the wellhead to the downhole oil pump.

Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

May 26, 2021 · The inner diameter of pump pipe was 100 mm, and the length of concrete in pump pipe was 935 mm. A piston was set at the entrance of the horizontal pipe. In this paper, the piston was used to push the concrete to realize the pumping behavior in the pump pipe. The trajectory of the piston is shown in the "pumping direction" in the figure.

A review on the pumping behavior of modern concrete — TU

Pumping is the most common technique used to transport fresh concrete in construction sites. The large-scale use of concrete all over the world makes the pumping increasingly important. A wide variety of additives and admixtures are incorporated into modern concrete in order for sustainable development.

Creep and shrinkage of concrete - Wikipedia

Creep and shrinkage of concrete are two physical properties of concrete.The creep of concrete, which originates from the calcium silicate hydrates (C-S-H) in the hardened Portland cement paste (which is the binder of mineral aggregates), is fundamentally different from the creep of metals and polymers. Unlike the creep of metals, it occurs at all stress levels and, within the service stress

A Review on the Pumping Behavior of Modern Concrete

Numerous recurrent situations following mixing and pumping of mortars and concretes cause degradation of fluidity and hardening characteristics. Which, in turn, lead to …

(PDF) Minimization of the Influence of Shear-Induced

Mar 27, 2020 · Pumping behaviour of modern concretes - Characterisation and prediction The paper at hand quantifies the influence of aggregate volume fraction on pumping behaviour of concretes …

Materials | Free Full-Text | An Experimental Assessment of

This study presents a flow pump technique usually used for evaluating the permeability of soils, which was, for first time, applied to measure the water permeability of concrete. Additionally, a new easy-to-apply method to determine permeability is proposed, based on a modification of Valenta's formula. In the calculations, the apparent air content of concrete mixes was taken into account.

A Review on the Pumping Behavior of Modern Concrete

Pumping of concrete plays a critical role in the modern construction industry. Pumping reduces the costs and shortens the completion time by providing a continuous casting and allowing the concrete to be supplied in difficult to access locations. Such outstanding mega tall buildings as Burj

Materials | Free Full-Text | Minimization of the Influence

Self-compacting concretes, compacting and de-aerating under the influence of gravity, offer advantages during placing and are known for excellent quality of the concrete surface [].However, these concretes only perform in the intended way if the flow properties are within a permissible range [].Therefore, the importance of measuring the rheological properties of fresh concrete is increasing.

Schleibinger Testing Systems - 27th Conference

Jul 03, 2018 · Pumping behaviour of modern concretes Dr. Egor Secrieru Institute of Construction Materials, Faculty of Civil Engineering, TU Dresden, Dresden, Germany. Squeeze flow of cement-based mortars: assessment of pressure distribution by dynamic mapping Fábio A. Cardoso, Franco A. Grandes, Victor K. Sakano, Andressa C.A. Rego, Rafael G. Pileggi

Studying the Printability of Fresh Concrete for Formwork

Jan 01, 2019 · For ordinary concretes it is evident from previous studies, that concrete flows as a plug in the pipelines; coarse aggregates move towards the center of the pipe forming a plug, while an easily deformable, lubricating layer is formed at the internal walls of the pipelines, leading to a considerable reduction in the required pumping pressure

Formation of lubricating layer and flow type during

Jul 30, 2018 · Pumping behaviour is predicted based on a combined experimental and analytical approach. Further, the LL thickness is quantified and compared with simulation results applying computational fluid dynamics (CFD). The prediction of pumping pressure for a specific flow rate is verified in small-scale pumping measurements. 2.

Estimation of the Pumping Pressure from Concrete

A new method is proposed to estimate pumping pressure based on concrete composition without experimental measurements. Previous studies show that the pumping pressure depends on the interface friction between concrete and the wall of the pumping pipes. This friction is determined by the thickness and the rheology of the boundary layer formed at the interface.

EFFECTS OF AGGREGATE TYPE, SIZE, AND CONTENT ON …

The effects of aggregate type, size, and content on the behavior of normal and high-strength concrete, and the relationships between compressive strength, flexural concretes containing limestone, nearly all of the coarse aggregate particles were fractured. Darwin, Tholen, Idun, and Zuo (1995, 1996) observed that concretes

Extrusion of Lightweight Concrete: Rheological

Aug 25, 2019 · Furthermore, it is beneficial to use lightweight aggregate concrete (LAC) instead of e.g. aerated concrete due to its higher robustness with regard to the pumping process. However, LAC differs from normal concrete as the porous lightweight aggregates absorb water and thereby change the characteristics of the fresh mixture.

NEW GENERATION OF CHEMICAL ADMIXTURES FOR …

common experience for two concretes giving identical slump or other test values to behave quite differently" (Banfill 2006). With modern concrete technology this behaviour can be quantified by comparing rheology, thixotropy, yield values and plastic viscosities using …

Experimental Insights into Concrete Flow-Regimes Subject

Mar 09, 2020 · from SIPM during pumping are introduced. According to the results the current methodologies which generally consider concrete as two homogeneous fluids—concrete bulk and lubricating layer—with defined rheological properties determined using rheometers are insu cient for predicting the pumping behavior of modern concretes [17–19].

CDF­,ASTM C666, Slabtest Viskomat NT, Viskomat XL

Pumping behaviour of modern concretes Control of the rheological properties of self­compacting concrete Program DFG SPP2005 ­ Rheology of reactive, multiscale multiphase construction materials Language By the way Accommodation Driveway Conference Fee Registration Program Thermal conductivity measurement on building materials

Changes in concrete properties during pumping and

Jun 01, 2018 · Pumping behaviour of modern concretes - Characterisation and prediction. PhD Thesis. Technische Unversität Dresden (2018) Google Scholar. Y.A. Abebe, L. Lohaus. Rheological characterization of the structural breakdown process to analyze the stability of flowable mortars under vibration. Constr. Build.

UNDERSTANDING THE PUMPABILITY OF CONCRETE

flow model allows to capture the viscous behavior of the fresh concrete. This is of prime importance to understand, and discriminate, the flow behavior of modern concretes such as self-leveling concrete and other highly plasticized concrete mixtures such as low water/cement ratio high performance wet-mix shotcretes. There