understanding the pumpability of concrete

"UNDERSTANDING THE PUMPABILITY OF CONCRETE" by

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.

(PDF) UNDERSTANDING THE PUMPABILITY OF CONCRETE

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 Aggregates for Concrete - MemphisRecycled concrete, or crushed waste concrete, is a Definitions of constituents Clear understanding and ASTM C 125 pumpability, economy, poros-ity, shrinkage, and durability of concrete. Variations in grading can seriously affect the uniformity of concrete

Assessing the Pumpability of Concrete

The 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. CONCRETE - BoralConcrete is bought and sold by the cubic metre volume of the freshly mixed ingredients. Specifications for concrete normally include a requirement for a certain design strength level for test cylinders cured for 28 days, or they are based on a prescription of a specified cement content. Other characteristics such

CONCRETE 101

Consistency is the ability of freshly mixed concrete to flow. For given proportions of cement and aggregates (without admixtures), the higher the slump, the wetter the mix. Four-inch (4) slump is very common with normal weight concrete and is a good average slump for pumping. Above average slump - due to the addition of water considerably reduces the strength, durability, and permeability of concrete Compressive Strength of Concrete Definition, Importance Strength of hardened concrete measured by the compression test. The compression strength of concrete is a measure of the concrete's ability to resist loads which tend to compress it. The compressive strength is measured by crushing cylindrical concrete specimens in compression testing machine. The compressive strength of concrete is calculated by the failure load

Concrete Mix Design - The Best Concrete Mix - The Concrete

Sep 17, 2020 · Rather than only specifying how much cement is in the mix, we should be considering things like permeability, shrinkage, workability, pumpability, stampability, and stainability. TYPES OF CONCRETE MIX. The type of concrete work you do will determine the type of mix you need:What Concrete Mix to Use for Stamping; Mix Design for Stained Concrete Durability of Modified Expanded Polystyrene Concrete after EPS concrete was produced by mixing the expanded polystyrene spheres (EPS) and polymer emulsion and thickener to the matrix concrete, and this concrete had good vibration energy absorption characteristics. Based on the experimental data obtained on EPS volume ratio of 0%, 20%, 30%, and 40% by replacing matrix or coarse aggregate, the two design styles had nearly the same compressive

GCP Scientists Contribute to Better Understanding of Deep

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. Introduction to ConcreteUnderstanding the fundamentals of concrete is necessary toproduce quality concrete. This publication covers the materials used in concrete and the essentials required to design and control concrete mixtures for a wide variety ofstructures. 1 Figure 1-1. C :, , , , , . Industry Trends

Making Concrete PumpableConcrete Construction Magazine

Jan 29, 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. Mechanics of Materials:Mixing Concrete - MIT CEEInstead, a common method to increase pumpability without compromising the final strength of the concrete is to add something called a superplasticizer. As a liquid, the concrete will appear to be waterier, but will have similar hardened strength values as without the superplasticizer. This is useful to creating high-performance concrete.

Mix Design and Pumped Concrete - Civil Engineering

A pumpable concrete, like conventional concrete mixes, requires good quality control, i.e., properly graded uniform aggregates, materials uniformly and consistently batched and mixed thoroughly. Depending on the equipment, pumping rates will vary from 8 to 70 m3 of concrete per hour. Mix Design and Pumped Concrete - Civil EngineeringA pumpable concrete, like conventional concrete mixes, requires good quality control, i.e., properly graded uniform aggregates, materials uniformly and consistently batched and mixed thoroughly. Depending on the equipment, pumping rates will vary from 8 to 70 m3 of concrete per hour.

Numerical Study on Concrete Pumping Behavior via

Substantial understanding of the ow behavior of fresh concrete during pumping will provide a good foundation for the solution of existing and potential problems in construction projects. Although fresh concrete is relatively less studied as compared to concrete materials and structures in On-Demand Course:Placing Concrete by Pumping1. Understand the applications for concrete pumping. 2. Recognize and understand the basics of concrete pumping equipment. 3. Identify proper concrete mixtures for good pumpability. 4. Summarize best practices for planning, preparation, and field operations. ERRATA INFO. Any applicable errata are included with individual documents at the time

Parameters influencing pressure during pumping of self

Jul 27, 2012 · Jolin M, Burns D, Bissonnette B, Gagnon F, Bolduc L-S (2009) Understanding the pumpability of concrete. Proc 11th Conf Shotcrete Underground Support, Davos. 23. Kasami H, Ikeda T, Yamane S (1979) On workability and pumpability of superplasticized concrete. Proc 1st CANMET/ACI Conf Superplasticizers in Concrete, Ottawa, pp 6786 Predicting pumpability and shootability of crushed Jan 01, 2016 · Several studies have been conducted to estimate the pumpability of normal- and high-performance shotcrete/concrete based on the rheology and other flow characteristics. Browne and Bamforth [5] attempted to predict the pumpability of fresh concrete based on

Predicting pumpability and shootability of crushed

Jan 01, 2016 · Several studies have been conducted to estimate the pumpability of normal- and high-performance shotcrete/concrete based on the rheology and other flow characteristics. Browne and Bamforth [5] attempted to predict the pumpability of fresh concrete based on Pumping Concrete:A Fundamental and Practical Approach Taking into account the mechanics of life-size pumping equipment, complete pressure profiles and pump cylinder fill-rates, along with rheological and tribological properties, are used to predict the mobility and pumpability of a given concrete mixture. A model that accounts for

Pumping Concrete:A Fundamental and Practical Approach

This 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 Pumping of concrete mixtures:rheology, lubrication layer 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 superior placement rates while reducing the required labor cost. Despite the fact that concrete pumping has been utilized on job sites around the world since the

Pumping of concrete mixtures:rheology, lubrication layer

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 superior placement rates while reducing the required labor cost. Despite the fact that concrete pumping has been utilized on job sites around the world since the early Rheology of high performance shotcrete - UBC Library Open The main goal of this study was to develop high performance shotcrete and to provide a fundamental understanding of the shooting process. For this, a laboratory concrete pump, to pump and/or shoot a number of shotcrete mixes, and a rheometer, to measure the rheological properties on the fresh shotcrete, were designed and constructed. A model based on rheological behavior was finally

Single stage concrete pumping through 2.432 km (1.51

Dec 01, 2015 · Reinforced by continual advancements in pump and concrete technologies, pumping to challenging heights and distances is becoming a possibility. Pumpability per-se is the ability of confined concrete to flow (to be mobilized) under pressure while maintaining its State of the Art on Prediction of Concrete Pumping Jun 16, 2016 · Concrete pumping pressure was predicted based on the frictional resistance coefficient derived through the 50 m pumping test. The results showed that the predicted value and applied pressure value are highly correlated. Nevertheless, its application on predicting the pumpability of concrete is limited because it needs a full-scale pumping test.

Testing pumpability of concrete using Sliding Pipe

Feb 28, 2014 · Concrete pumping is one of the key reasons for this tremendous change. It has made feasible the construction of very large structures, i.e., bridges and skyscrapers, within very short times. Thus, concrete pumping is a significant, very important activity in modern construction. Tests to Establish Concrete PumpabilityThe American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design

The following information is for your knowledge and

weight concrete and is a good average slump for pumping. Above average slump - due to the addition of water considerably reduces the strength, durability, and permeability of concrete and can cause segregation. When possible, admixtures should be used instead of water to achieve higher slump. Slump loss through the pump can negatively affect UNDERSTANDING 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.

Understanding Wet-Mix Shotcrete:Mix Design

required between pumpability and shootability requirements. At the pump, a relatively fluid concrete that will be easy to pump is required; at the nozzle, a stiff material is desired so it does not sag or slough on the wall. Most of the time, the simplest solution is to add a set-accelerator at the nozzle and/or adapt the application schedule to Understanding the pumping of conventional vibrated and Jan 01, 2012 · From a practical point of view, concrete is defined as pumpable if it can be pumped through a pipeline without problems (ACI Committee 304, 1998) and if the properties of the concrete do not change significantly due to the pumping process (Jolin et al., 2006). The pumpability of concrete is mainly related to the saturated or unsaturated condition.

What are the Factors Affecting Workability of Concrete?

The workability of concrete is reduced and increased based on the quantity of silica fume. The use of silica fume in concrete can improves workability when used at low replacement rates, but can reduce workability when added at higher replacement rates. Silica fume are used as pumping aid for concrete when used as 2 to 3% by mass of cement. What is Concrete? Definition, Ingredients, How It's Made 1. 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.

What is Workability of Concrete? - Gilson Co.

Workability of Concrete is a broad and subjective term describing how easily freshly mixed concrete can be mixed, placed, consolidated, and finished with minimal loss of homogeneity. Workability is a property that directly impacts strength, quality, appearance, and design of concrete pumpconcrete 101 - American Concrete Pumping Association Air loss can be minimized when pumping by slowing down the free- fall of the concrete normal weight concrete and is a

UNDERSTANDING THE PUMPABILITY OF CONCRETE

general, 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

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