A Review on the Pumping Behavior of Modern Concrete

Li, Huajian; Sun, Dazhi; Wang, Zhen; Huang, Fali; Zhonglai, Yi; Yang, Zhiliang; Zhang, Yong

doi:10.3151/jact.18.352

Cited by 25 publications

(15 citation statements)

References 37 publications

(61 reference statements)

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“…This paper presents experimental results concerning the permeability of concrete in which the influence of a new generation of polycarboxylate superplasticizers and a chemically active admixture to increase the compressive strength was also evaluated. Additives and admixtures are nowadays incorporated into modern concrete to improve its construction performance, but they also influence the pumping behavior of such concrete, which differs significantly from that of conventional concrete, especially in the initial stage [ 23 , 24 ]. The final goal of using chemical admixtures is to achieve a more durable concrete with self-healing ability [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

2020

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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. An additional purpose of the conducted research was to determine the influence of a new generation of polycarboxylate superplasticizer and chemically active admixtures on the permeability, compressive strength, and other properties of concrete. The following four types of concrete were tested: concrete without admixtures, concrete with an admixture to increase the compressive strength, concrete with a superplasticizer, and concrete containing two admixtures simultaneously. The results showed that the proposed method allows to obtain reliable measurements within a very short period of time. The obtained results confirmed that new method may be very useful in engineering practice, particularly in terms of the watertightness of hydrotechnical concretes and the properties of the concretes used in bridge construction, underground parts of office buildings, or sealed tanks.

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Section: Introductionmentioning

confidence: 99%

An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

2020

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“…This paper aims to evaluate concrete with compressive strength of 20-70 MPa. The objectives of the study are (1) to examine the sources of concrete used in the construction to determine the service life of concrete structures; (2) to assess the durability of SCC and C20/25 with respect to their contents; (3) to evaluate plasticizing agents as admixtures for concrete products; (4) to compare the tribological properties of SCC and C20/25 concretes; and (5) to measure the coefficient of friction for concrete samples on steel with the TR210 device. The primary objective is to compare the durability properties of SCC and concrete with equivalent compressive strength.…”

Section: Mission Statementmentioning

confidence: 99%

“…Therefore, it is imperative to develop new and improve the existing ways of enhancing concrete properties. Besides the strength of hardened concrete, it is necessary to consider the tribological characteristics of fluid concrete, which directly affect the formwork design [1]. The past decade saw a rise in the popularity of self-compacting concrete (SCC).…”

Section: Introductionmentioning

confidence: 99%

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Determining the tribological features of concrete and assessing the service life of architectural facilities

Kuzmin¹,

Martínez‐García²,

Kharitonenkov³

et al. 2021

J. meas. eng.

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The construction industry is increasingly striving to improve the tribological features of architectural structures to increase their service life. The focus lies on self-compacting concrete (SCC) as the most appropriate option to fulfil this task. However, there are still some problems related to its durability, particularly in terms of physical and chemical properties, which are crucial in preventing corrosion of the reinforcement. This study seeks to assess the durability of self-compacting concrete and С20/25 class concrete with similar compressive strength. The measurements taken during the study include the primary strength indicators (water porosity, chloride diffusion, and oxygen permeability) and additional properties necessary for a better understanding (mercury porosity, capillary water absorption, carbonation, and ammonium nitrate leaching). Mixes of SCC and conventional concrete contained the same raw materials in identical proportions. Test results revealed that the service life of these two concretes could be considered equivalent. Therefore, self-compacting concrete with specific compressive strength can be regarded as durable as shock concrete. The scientific novelty of the study lies in the measurement of durability properties and the service life of concrete structures taking the coefficient of friction on a steel plate for the purpose of comparing concretes with equivalent compressive strength.

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“…Contradicting requirements of properties always exist in different casting processes. For example, fresh concrete should possess relatively low yield stress, suitable plastic viscosity and excellent stability during pumping process [1][2][3]. After the concrete casting into the formwork, however, a higher yield stress is beneficial to reducing the formwork pressure and speeding up the casting process [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Flow behavior of cementitious-like suspension with nano-Fe3O4 particles under external magnetic field

et al. 2021

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The flow behavior of cementitious-like (limestone powder) suspension containing nano-Fe3O4 particles at constant shear rate of 10 s−1, characterized by the evolution of apparent viscosity over time, is investigated under various magnetic fields. Results show that the limestone powder suspension at flow-state exhibits remarkable magneto-rheological responses, reflected by a significant increase in the apparent viscosity after applying an external magnetic field. A higher field strength corresponds to a more rapid and pronounced response. The apparent viscosity experiences a sudden alteration with the stepwise change of the magnetic field due to the formation or disintegration of magnetic clusters. Linearly increasing magnetic field strength at low ranges (e.g. 0 T–0.3 T) shows less influences on the evolution of apparent viscosity, while at relatively high magnetic field, the apparent viscosity gradually increases with the magnetic field strength and the increase rate is comparable to that obtained under constant high magnetic field of 0.75 T. When the magnetic field is removed, the apparent viscosity exhibits a sharp reduction. If the magnetic field strength linearly decreases to zero, however, the apparent viscosity continuously increases until reaching a peak and then gradually decreases. This research shows in different ways how a desired apparent viscosity level of a cementitious-like suspension can be reached by means of an external magnetic field.

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A Review on the Pumping Behavior of Modern Concrete

Cited by 25 publications

References 37 publications

An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

Determining the tribological features of concrete and assessing the service life of architectural facilities

Flow behavior of cementitious-like suspension with nano-Fe3O4 particles under external magnetic field

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