Estimation of Super High-Rise Pumping Pressure for High

Traditional methods fail to predict the pumping pressure loss of high-performance concrete properly in super high-rise pumping situations due to complex changes of concrete properties. Therefore, it is imperative to propose a relative accurate method for pumping pressure estimation in super high-rise buildings. This paper builds the simplified pressure calculation method “pressure

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Project Management for Construction: Cost Estimation

Example 5-2: Screening estimate of a grouting seal beneath a landfill One of the methods of isolating a landfill from groundwater is to create a bowl-shaped bottom seal beneath the site as shown in Figure 5-0. The seal is constructed by pumping or pressure-injecting grout under the existing landfill.

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A success history-based adaptive differential evolution

Dec 18, 2019 · Ngo TT, Kadri EH, Bennacer R, Cussigh F (2010) Use of tribometer to estimate interface friction and concrete boundary layer composition during the fluid concrete pumping…

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Concrete Pumps - Types and Selection - The Constructor

A good concrete pump must be able to withstand this long-term pressure. If the quality of the concrete pump is below average, it results in the breakdown and loss for the construction projects 2. Purpose of Concrete Pump The concrete pump must completely satisfy the purpose for which it was bought. For example, if a concrete pump that was

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Parameters influencing pressure during pumping of self

Jul 27, 2012 · The lubrication layer facilitates the pumping of concrete through pipes. If no lubrication layer could be formed, the pumping pressure would be significantly higher to pump the concrete at the same discharge rate. Some authors take the effect of the lubrication layer into account by introducing a slipping or sliding velocity [18, 19, 24, 30, 31].

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Optimization of fresh concrete pumping pressure loss with

Mar 22, 2021 · 1. Introduction. In line with the continuous development of concrete construction technology, pumping has become an indispensable process in the construction of houses, roads, bridges, etc., .The pressure loss and pipe wear caused by fresh concrete during pumping have long been the focus of researchers' attention, .There are many factors affecting the wear mechanisms of pipes, such …

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Solved Professor Giljum is working on a design project to

Professor Giljum is working on a design project to rehabilitate a damaged 54-in diameter reinforced concrete force main (i.e. pressure sewer). A pumping plant discharges to both the 54- in force main and a parallel 60-in relief force main, which combine at three different points in the system. Briefly explain how to estimate what percentage of

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Effect of lubrication layer on velocity profile of

Jan 22, 2015 · Moreover, many studies on concrete pumping, including tribology, are based on this principle of equivalence. For the tribometers, the friction between the concrete and the wall is measured at the atmospheric pressure. However, the results obtained are still applicable to the situation of pumping of concrete (pressure driven flow) [17, 21].

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Table 3 | Estimation of the Pumping Pressure from Concrete

Estimation of the Pumping Pressure from Concrete Composition Based on the Identified Tribological Parameters Chanh-TrungMai,El-HadjKadri,Tien-TungNgo,AbdelhakKaci,andMustaphaRiche Laboratory LMG C, University of Cergy Pontoise, Cergy Pontoise, France Correspondence should be addressed to Tien-Tung Ngo; [email protected]

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Pump calculations - The Engineering Mindset

Sep 11, 2017 · Paul Evans. -. Sep 11, 2017. 10. Pump calculations how to calculate pump speed, head pressure, rpm, volume flow rate, impeller diameter. In this article we learn how to perform pump calculations in both imperial and metric units to assess pumping performance following the change of flow rate, pump speed, head pressure and power.

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Pumping Cement-Based Materials

Essential to a pumping job is a "pumpable" mix. The American Concrete Institute (ACI) defines pumpability as "capability of a specific concrete mixture to be pumped through a delivery pipeline." A pumpable mix is one that is transported to the point of placement with sufficient pressure, required workability, and within a required

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Concrete pumping prediction considering different

May 20, 2018 · Fig. 1 shows the calculated results of the pumping pressure according to the plastic viscosity of bulk concrete, ranging from 50 Pa·s and 300 Pa·s, with constant reference values for the other rheological properties. As the plastic viscosity changes, the required inlet pumping pressure to obtain a constant flow rate shows some variations but relatively small compared to the results of …

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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.

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Estimation of the Pumping Pressure from Concrete

Estimation of the Pumping Pressure from Concrete Composition Based on the Identified Tribological Parameters By Chanh-Trung Mai, El-Hadj Kadri, Tien-Tung Ngo, Abdelhak Kaci …

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Concrete Formwork Loads and Pressure Calculations - The

Where: P: Lateral pressure of concrete, kPa : Density of concrete, Kg/m 3 g: Gravitational constant, 9.81 N/kg h: Depth of fluid or plastic concrete from top of the placement to the point of consideration in the form, m However, ACI 347-04 stated that, if concrete slump value is no larger than 175 mm and placed with normal vibration to a depth

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Pumping Cement-Based Materials

Essential to a pumping job is a "pumpable" mix. The American Concrete Institute (ACI) defines pumpability as "capability of a specific concrete mixture to be pumped through a delivery pipeline." A pumpable mix is one that is transported to the point of placement with sufficient pressure, required workability, and within a required

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Table 2 | Estimation of Super High-Rise Pumping Pressure

Estimation of Super High-Rise Pumping Pressure for High-Performance Concrete Based on Computational Fluid Dynamics Modeling and Situation Measurement Table 2 The comparison for the calculated pressure value and measured one.

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(PDF) Estimation of the Pumping Pressure from Concrete

21 rows · A new method is proposed to estimate pumping pressure based on concrete composition

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Evaluating the printability of concretes containing

May 01, 2020 · Also, it should be noted that the differences in the pressure required to pump can also be a factor that affects the extrudability of mixes. For instance, Choi et al . studied the effect of increasing the aggregate size on concrete pumping. They measured the pumping pressure for different concretes having aggregate sizes varying from 10 to 25 mm.

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STRUCTURE magazine | Rheological Properties of Concrete

To achieve better quality by limiting segregation, producing a good surface finish, minimizing pumping pressure, or controlling formwork pressure, it is necessary to balance the rheological properties of concrete. Ferraris et al. (2017) suggested the following

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