Electro-Osmosis Applied for Formwork Removal of Concrete

Goudjil, N.; Vanhove, Yannick; Djelal, Chafika; Kada, Hassina

doi:10.3151/jact.10.301

Cited by 13 publications

(6 citation statements)

References 6 publications

(8 reference statements)

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“…Another approach in improving the situation (for fresh concrete in general) has been introduced by Choi et al [27] in a first pilot test, applying an externally imposed electromagnetic field in order to facilitate the formation of a lubrication layer. This technique has been inspired by a recently developed formwork removal technique based on electro-osmosis [28].…”

Section: Performance Concretementioning

confidence: 99%

Pumping of Fresh Concrete: Insights and Challenges

Schutter

Feys

2016

RILEM Tech Lett

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Pumping of fresh concrete is of utmost importance for concrete practice. Required pumping pressures are typically estimated based on design charts. However, with the increased use of chemical admixtures and the development of more flowable concrete mixtures, the accuracy of traditional design charts is questioned. In recent years, significant progress has been obtained in understanding the flow of the material in the pumping pipe, including the behavior of the lubrication layer near the pipe surface. In comparison with traditional design charts, this results in more reliable pressure predictions when considering very fluid concrete types like self-consolidating concrete. Some remaining challenges can be defined however.

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Section: Performance Concretementioning

confidence: 99%

Pumping of Fresh Concrete: Insights and Challenges

Schutter

Feys

2016

RILEM Tech Lett

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“…When an external electric field is applied to the fresh cement paste, a combination of particle, water and ion migration occurs. Depending on the field strength, duration and the application time, noticeable impact on chemical and mechanical properties and microstructure of the cement system can be observed [33,39,40]. Potential negative impact of electrochemical treatment of cement-based materials is further discussed in Section 4.…”

Section: Applications In Concretementioning

confidence: 99%

“…Recently, electroosmosis was applied to facilitate demolding of concrete elements [40]. Instead of using release agent, application of an electric field on the mold after casting was used to induce migration of pore water toward the concretemold interface.…”

Section: Demolding Of Concrete Elementsmentioning

confidence: 99%

“…This could result in significant displacement of fine particles and thus cause a modification of the microstructure. The displacement of fine particles decreases the permeability coefficient (Figure 6) and therefore leads to a decrease in the amount of water being displaced [40]. In order to reach a good quality of demolding and facing, the quantity of transported water must be sufficient.…”

Section: Demolding Of Concrete Elementsmentioning

confidence: 99%

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Electrokinetics Application in Concrete and Well Construction

Jafariesfad

Sangesland

Gawel

et al. 2020

Volume 11: Petroleum Technology

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Electrically induced or coupled transport processes including electrophoresis, electroosmosis and electromigration in solutions and porous media under an external electric field have been extensively studied and employed in many disciplines. For protection and rehabilitation of concrete structures, cathodic protection, electrochemical realkalization, and chloride extraction are extensively used. Other electrokinetic techniques are developed for the concrete industry, but have not been widely used so far, including electrokinetic treatment processes, for corrosion mitigation, recovery from sulfate attack, crack healing, and porosity and permeability reduction. These processes can improve the microstructure of the cement-based systems resulting in an improved performance in long-term and can be applied to repair failed structures. Application of electrokinetic processes are rapidly extended in well construction due to the increased interest in techniques enabling manipulation of micro- and nanosized particles. The techniques could be beneficial in building a robust cement sheath in oil and gas wells. Additionally, electrokinetic remediation techniques can possibly be introduced for repairing damaged structures in oil and gas wells. This review provides an overview of electrokinetic-based techniques, which has been introduced to cement-based materials, mainly reinforced concrete. The potential application of these techniques in oil well construction is discussed.

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“…A more innovative application of an electrical field can be found in the papers of Goudjil et al [ 48 , 49 ]. They impose an electric potential on a steel formwork panel, up to a level of 3 V during 10 min, in view of polarizing the concrete layer close to the formwork surface.…”

Section: Current Practices With Active Intervention To Control Concrementioning

confidence: 99%

Active control of properties of concrete: a (p)review

Schutter

Lesage

2018

Mater Struct

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Concrete properties to a large extent depend on mix design and processing, currently leaving only limited options to actively modify concrete properties during or after casting. This paper gives a (p)review on a more advanced active control of properties of concrete, based on the application of external signals to trigger an intended response in the material, either in fresh or hardened state. Current practices in concrete industry that could be considered as active control are briefly summarized. More advanced active control mechanisms as studied in other fields, e.g. based on hydrogels and other functional polymers, are reviewed and some principles are listed. A specific focus is further given on potential methods for active rheology control. Based on the concepts developed in other fields, substantial progress could be made in order to achieve active control of fresh and hardened concrete properties. However, several challenges remain, like the stability and functioning of the responsive material in a cementitious environment, the applicability of the control signal in a cementitious material, and the economy, logistics and safety of a control system on a construction site or in precast industry. Finding solutions to these challenges will lead to marvelous opportunities in general, and for 3D and even 4D printing more particularly.

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Electro-Osmosis Applied for Formwork Removal of Concrete

Cited by 13 publications

References 6 publications

Pumping of Fresh Concrete: Insights and Challenges

Pumping of Fresh Concrete: Insights and Challenges

Electrokinetics Application in Concrete and Well Construction

Active control of properties of concrete: a (p)review

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