This article presents some of the most recent research on the understanding of the key parameters affecting concrete mobility and stability under pressure, i.e. pumpability. Taking into account the mechanics of full size pumping equipment, the concept of Real Paste Content is introduced as a minimal quantity of effective paste under pressure available for mobility through a hose system.Assessing the Pumpability of ConcreteThe pumpability of concrete can be described by the consistency and the cohesiveness of this mix. The consistency is the relative ability to flow and in China this is measured by the slump test. The cohesiveness is the resistance to segregation and bleeding.
With the increasing need for underground opening's support and the increasing knowledge available today in concrete technology, shotcreting, and particularly the wet-mix process, is in great understanding the pumpability of concreteCited by 13UNDERSTANDING THE PUMPABILITY OF CONCRETE - COREThis article presents some of the most recent research on the understanding of the key parameters affecting concrete mobility and stability under pressure, i.e. pumpability. Taking into account the mechanics of full size pumping equipment, the concept of Real Paste Content is introduced as a minimal quantity of effective paste under pressure available for mobility through a hose system.Concrete Basics in Construction from Construction understanding the pumpability of concreteAn important item to understand in concrete work is the water-cement ratio. A minimum amount of water, approximately 25% of the weight of the cement, must be included to chemically hydrate the concrete batch. In the actual mixing process, though, it takes about 35% to 40% water to work through the mixing process, get to the actual cement, and understanding the pumpability of concrete
2.4. Tests of Pumpability, Shootability, and Mechanical Properties. Pumpability of fresh concrete meant that the concrete mixtures could flow in pipes without blockage ; Shootability was regarded as the ability of fresh concrete to be sprayed with suitable cohesion and adhesion .The slump value could reflect these two abilities of fresh concrete.European research project aims to understand concrete understanding the pumpability of concreteSep 10, 2020 · A new research project supported by the European Union aims to clarify, enhance and unify methods of structural integrity assessment of safety-critical concrete infrastructure in support of long-term operation of nuclear power plants. Coordinated by Finland's VTT Technical Research Centre, the collaborative project seeks to improve the understanding of ageing and deterioration of such concrete.GCP Scientists Contribute to Better Understanding of Pumpability, which is a mix's stability and mobility under pressure, tends to rate better with high slump. High slump, however, does not bode well for a mix's adhesion (stickiness to the surface) and cohesion (stickiness to itself). In contrast to pumpability, good sprayability excels when the mix is highly viscous, a "sticky mix," with low slump.
Jan 28, 2020 · Factors that Impact Pumpability A wide array of factors can impact concrete pumpability, Bui notes, such as the dimension, shape, gradation, and volume of aggregates. Supplementary materials like fly ash, silica fume, slag, and limestone also influence the rheology of the mix and therefore its pumpability.Mix Design and Pumped Concrete - Civil EngineeringA simple method of concrete mix design for pumpable concrete based on an estimated weight of the concrete per unit volume is described in the paper. The tables and figures presented are worked out by the author from a wide range of Indian materials. understanding the pumpability of concrete Testing for pumpability understanding the pumpability of concrete I found this paper very useful to gain a basic understanding of understanding the pumpability of concretePrediction on pipe flow of pumped concreteunderstand the flow of the concrete in a pipe as well as to predict whether a concrete would be pumpable. Figure 1 Profile of flow of concrete in a pipe  3. ANALYTICAL APPROACH TO PREDICT THE PUMPABILITY The analytical method for the pumpability of concrete could be obtained from previous studies [2, 4].
Concretes higher reflectance keeps surfaces cooler, helps minimize the urban heat island effect, and can lower infrastructure and ongoing lighting costs, while boosting safety for vehicles and pedestrians. Pavement joint deterioration is the premature disintegration of concrete around the joint (Figure 1).Pumping Concrete A Fundamental and Practical Approach understanding the pumpability of concreteThis paper presents some of the most recent research on the understanding of the key parameters affecting concrete mobility and stability under pressure, i.e. pumpability. Taking into account the mechanics of life-size pumping equipment, complete pressure profiles and pump cylinder fill-rates, along with rheological and tribological properties understanding the pumpability of concretePumping of concrete mixtures rheology, lubrication layer understanding the pumpability of concretePumping 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 superior placement rates while reducing the required labor cost. Despite the fact that concrete pumping has been utilized on job sites around the world understanding the pumpability of concrete
Feb 28, 2014 · In the article at hand the new, specialized device for testing concrete pumpability the Sliding Pipe Rheometer is introduced and its working procedure briefly explained. Furthermore, a parameter study on the effects of mixture composition on the pumpability of fresh concrete performed with Sliper is presented.UNDERSTANDING THE PUMPABILITY OF CONCRETE - The research efforts reported over the last decade on the pumpability of concrete usually focus on either the stability of concrete under pressure, or on its mobility under. What are the components of concrete?What are the components of concrete?Concrete is made up of three basic components water, aggregate (rock, sand, or gravel) and Portland cement.UNDERSTANDING THE PUMPABILITY OF CONCRETEgeneral, concrete pumpability is defined as the capacity of a concrete under pressure to be mobilized while maintaining its initial properties (Gray (1), Beaupré, (2)). The research efforts reported over the last decade on the pumpability of concrete usually focus on either the stability of concrete under pressure, or on its mobility under
The density of concrete is a measurement of concretes solidity. The process of mixing concrete can be modified to form a higher or lower density of concrete end product. A very high density of concrete is that made around steel cables that have been stretched by hydraulic jacks. The concrete is allowed to harden and then the jacks are released.Understanding the Rheology of Concrete Request PDFWith its distinguished editor and expert team of contributors, Understanding the rheology of concrete is an essential reference for researchers, materials specifiers, architects and designers in understanding the pumpability of concreteWhat Makes Concrete Pumpable?Concrete Construction For best pumpability, coarse aggregate grading should fall in the center of the gradation specifications. Porosity will affect pumpability if a significant amount of mix water is absorbed by the aggregate during pumping. When absorption causes problems, one solution is to thoroughly wet the aggregate stockpiles before batching the concrete.
The shape of aggregates affects the workability of concrete. It is easy to understand that rounded aggregates will be easy to mix than elongated, angular and flaky aggregates due to less frictional resistance. Other than that, the round aggregates also have less surface area compared to elongated or irregular shaped aggregates. This will make understanding the pumpability of concreteWhat is concrete - Concrete Defined - The Concrete Network1. The concrete mix is workable.It can be placed and consolidated properly by yourself or your workmen. 2. Desired qualities of the hardened concrete are met for example, resistance to freezing and thawing and deicing chemicals, watertightness (low permeability) , wear resistance, and strength. Know what you are trying to achieve with the concrete.