Tien-Tung NGO

This study pays attention on the use of empirical models that are established from the experimental data to evaluate the concrete pumpability. The purpose of the study is to reduce the amount of

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Properties of Sustainable Fresh Concrete Project | NIST

Nov 01, 2019 · The construction industry is becoming increasing reliant on pumping for the placement of concrete; thus, implying that a concrete must have the desired early age performance as specified by the engineer. This project will remove major technical barriers by providing the industry with measurement science tools to specify, qualify, and assure the pumpability of concrete at the job site.

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Practical Tribometer to Estimate Pumpability of Fresh Concrete

parameters. Nowadays, the single experimental method to estimate the concrete pumpability is based on tribometrical measurements. From concrete composition, and fixed mechanical factors, the only method to estimate the pumpability is the abacus of Putzmeister. This abacus gives the pumping pressure from concrete slump value only.

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Properties of concrete prepared with PVA-impregnated

This paper reports an experimental study to improve the properties of recycled concrete aggregates (RCA) by their impregnation with polyvinyl alcohol (PVA). The effects of PVA on the development of strength and durability properties of the recycled aggregate concrete were evaluated. The experimental investigation was conducted in two parts.

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Mechanical Performance of Sprayed Engineered Cementitious

Oct 04, 2018 · This paper presents an experimental study on the fundamental performances of a sprayed engineered cementitious composite (ECC) in repair systems. ECC serving as a repair material has been expected to be highly effective in providing durable repaired structures because of the tight crack width control and high delamination resistance.

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A REVIEW PAPER ON STUDY OF EFFECT OF COARSE …

concrete. The main aim of this study was to find the optimum percentage of flaky aggregate allowable in the concrete to obtain better workability and strength. From the experimental work, it is concluded that 20% of flaky aggregate is acceptable in the total coarse …

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Experimental studies on rheological properties of smart

affects its flow properties and pumpability. 2. Review of literature . There have been many research works involving the studies on the rheological behavior of self compacting concrete. Effect of mineral admixtures, cementitious materials, fine aggregates, chemical admixtures on the rheology of concrete have been studied by various researchers.

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Full-scale pumping tests of low-viscosity ultra-high

Some studies have focused on the relationship between the pumpability and the characteristics of the boundary layer, which is the interface between concrete and piping during pumping [,, ]. Ngo TT et al. [ 7 ] said that the friction of the interface between the concrete and the steel pipe plays a very important role in pumpability.

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Assessing the Pumpability of Concrete

One of the early studies on the pumping of concrete is the paper published by Ede (12). The interesting observations of his study are that hydraulic conditions are present during concrete pumping and that the amount of friction is not related to the pressure applied, which in turns means that the energy loss in a straight length of

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UNDERSTANDING THE PUMPABILITY OF CONCRETE

Pumpability is not an intrinsic concrete feature [1], but it is rather the result of a holistic approach involving the enhancement of concrete composition [2] [3] [4], the adaptation of pipeline

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International Concrete Abstracts Portal

Sep 01, 2021 · In this study, a new method was proposed to improve concrete pumpability. The friction between concrete and the internal surface of the pipe can be reduced by externally injecting a small amount of a chemical agent called a friction-reducing agent (FRA) into the pipe. The new idea was experimentally implemented with real-scale concrete pumping of 112, 137, and 518 m (367, 449, and …

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Experimental Study on Concrete using Silica Fume and Fly Ash

The aim of this study is not only to make the less cost of construction, but also to provide a good quality concrete by replacing cement with a waste material but super pozzolanic silica fume & fly ash. And to study the compaction factor, strength and workability of silica fume & fly ash concrete, through an experimental investigation.

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Predicting Pumpability and Shootability of Crushed

Nov 14, 2016 · This study aims to estimate the pumpability and shootability of wet-mix shotcrete (WMS) made with crushed aggregates and various admixtures such as silica fume, fly ash, ground granulated blast furnace slag (GGBFS), metakaolin, and steel fiber based on rheological properties. The IBB rheometer was employed as an apparatus to measure the rheological properties of freshly mixed …

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Performance Evaluation of Low Permeable Concrete Bridge …

the amount of labor required to construct a concrete structure. Improved finishability improves the aesthetics of any concrete structure. Improved pumpability can also reduce the labor required because it may allow concrete to be pumped rather than placed by other more expensive means.

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Experimental Study on Improvement in Axial Load Carrying

The experimental study consisted of 5 concrete columns which were tested under axial force on a UTM. Among the five columns one was kept as control column and the other four were jacketed with different meshes. The parameter considered for the study is shape of wire mesh. The following remarks can be drawn from this experiment. Energy

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The Experimental Study Of Stiffness Of Concrete Beams

For this reason, in this article, the author does some research to the stiffness of the CFRP strengthened beams in the normal use through experimental study and finite element simulation.In the actual reinforcement project, the original structure has already withstand a certain load, so reinforced structure is in the state of the secondary load.

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China 160t/H Asphalt Mixing Plant (LB2000) for Road

China 160t/H Asphalt Mixing Plant (LB2000) for Road Construction, Find details about China Machine, Machinery from 160t/H Asphalt Mixing Plant (LB2000) for Road Construction - …

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Analytical and experimental study of using recycled tire

The conclusion of this study shows that the concrete performance can be enhanced by modifying the roughness of shredded rubber. Sofi et al., performed an experimental study on recycled concrete to evaluate the compressive strength and modulus of elasticity of concrete. They investigated high-strength concrete with 5% to 15% replacement of

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Experimental Study on Effect of Addition of Fly Ash on

Experimental Study on Effect of Addition of Fly Ash on Mechanical particles contributes to improvement of the workability of concrete by reducing the friction at the aggregate paste interface and hence improves the pumpability of concrete. B. Compressive strength Fig 2 shows variation of compressive strength with % fly ash

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STRUCTURES20 - Publications

Experimental Study on Improvement of Concrete Pumpability By External Injection Method Jung Soo Lee*, Seung Hee Kwon. Evaluation of 3D concrete printing performance Keon-woo Lee, Myoung-Sung Choi* An experimental and numerical study on the local failure of prestressed concrete panels due to collision Seong Ryong Ahn*, Thomas Kang.

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