Variations of sorptivity with rheological properties of concrete cover in self-consolidating concrete

Aïssoun, Baudouin M.; Khayat, Kamal H.; Gallias, Jean-Louis

doi:10.1016/j.conbuildmat.2016.03.006

Cited by 31 publications

(13 citation statements)

References 16 publications

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“…The secondary rate of absorption calculations indicated an increasing trend with the inclusion of WFS at 28 days, while there was no significant change in the values at 90 and 365 days. The possible explanation for this may be that the larger pores in concrete are initially saturated faster and the smaller pores are gradually filled with time 46 . At 28 days, the calculated values of S i for WFS0 and WFS5 were 0.0039 and 0.0035, respectively.…”

Section: Resultsmentioning

confidence: 96%

Durability performance of self‐compacting concrete made with waste foundry sand

Sandhu

Siddique

2021

Structural Concrete

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The utilization of waste foundry sand (WFS) has been widely explored in conventional concrete to evaluate strength and durability properties. In this study, durability properties of self-compacting concrete (SCC) made with various percentages (0%-30%) of WFS as a partial replacement of river sand up to the age of 365 days are investigated. Annually, more than 60 million metric tons of WFS is produced worldwide from the casting industry, creating environmental problems. The scarcity of river sand is another major area of concern that can be addressed with the utilization of WFS in concrete. Tests were conducted for fresh properties, compressive strength, water absorption, sorptivity, rapid chloride permeability, and sulfate resistance. All the SCC mixes exhibited fresh-state properties as per EFNARC. With the incorporation of WFS up to 30% increased volume of permeable pore space (13.43%-16.67%), water absorption (2.11-3.07 mm), chloride permeability (2119-3553 C), and decreased compressive strength of sulfatecured samples by nearly 5% compared to water-cured samples at 28 days of curing were observed. The concrete samples showed better performance of pore structure, permeation, sulfate attack, and chloride permeability at 90 and 365 days of curing age. It was found that cost-effective SCC with performance comparable to the control mix could be achieved by using WFS up to 10%.

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Section: Resultsmentioning

confidence: 96%

Durability performance of self‐compacting concrete made with waste foundry sand

Sandhu

Siddique

2021

Structural Concrete

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“…For example, at 72 h the height of water rise against PW and PVC varied between 14 to 24 mm and 18 to 28 mm, respectively. As was shown in a previous study [6], for a given formwork, this variation is a function of T 50 of the SCC which probably influence the size and/or the total volume of large capillary pores. The higher penetration of water in concrete formed with PVC compare to PW formwork can be due to the reduction of sorptivity of concrete cover against PW formwork in the first 7 mm surface layer, which can slow down the speed of water rise.…”

Section: Influence Of Formwork Materials On Sorptivity Of Sccmentioning

confidence: 85%

“…On the other hand, in previous work the authors [6] showed that in case of SCC, the sorptivity of the bulk concrete can be affected by the rheological properties of concrete, particularly the initial plastic viscosity. Thus, it is reasonable to assume that formwork material could influence the transport properties of self-consolidating concrete near formed surfaces.…”

Section: Introductionmentioning

confidence: 96%

“…Transport properties and permeability of concrete depend on the mix design and curing conditions [1][2][3][4]. The durability of concrete, and in particular self-consolidating concrete (SCC), can vary with the rheological properties of the concrete that affect the consolidation, bleeding, surface settlement, segregation, as well as stability of entrained air [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Influence of formwork material on transport properties of self-consolidating concrete near formed surfaces

Aïssoun

Gallias

Khayat

2017

Construction and Building Materials

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“…A durable reinforced concrete structure should maintain its original shape, quality, and ease of maintenance when exposed in the environment throughout its projected service life [1]. To protect against aggressive agents, the reinforcement is encased in a concrete cover layer [2], [3], which is defined as the distance between the outer face of the structural member to the nearest bar, including the stirrup and secondary reinforcement [4], [5]. The minimum cover implemented should ensure safe transmission of bond forces, protection of steel bars against corrosion (durability) and adequate fire resistance [6].…”

Section: Introductionmentioning

confidence: 99%

Computational and experimental simulation to analyze loss in concrete cover by reinforcement deformation in solid slabs

Maran

Barreto

Molin

et al. 2022

Rev. IBRACON Estrut. Mater.

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Adequate cover thickness contributes to the correct performance of reinforced concrete structures. Spacers are recommended in standards to maintain a concrete cover; however, many regulations do not provide sufficient guidelines for their use, resulting in poor construction. A research program was developed for solid slabs through computational and experimental simulations to minimize errors in the cover by assessing different reinforcement bar diameters and spacer distribution, considering realistic element construction and standards, combining theory with practice. The results show that the use of spacers does not guarantee the design cover for some reinforcement bar diameters, as 4.2 and 5.0 mm, and regardless of the spacer distribution configuration assessed, these meshes undergo permanent deformation, thereby damaging the cover and consequently impact structural performance. Meshes of 6.3 and 8.0 mm diameters present deformation within the cover tolerance. Therefore, it is preferable to choose bigger diameters and larger mesh spacing to guarantee the projected cover, contributing to the correct performance of the structures, solving one of the major problems in this type of construction.

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Variations of sorptivity with rheological properties of concrete cover in self-consolidating concrete

Cited by 31 publications

References 16 publications

Durability performance of self‐compacting concrete made with waste foundry sand

Durability performance of self‐compacting concrete made with waste foundry sand

Influence of formwork material on transport properties of self-consolidating concrete near formed surfaces

Computational and experimental simulation to analyze loss in concrete cover by reinforcement deformation in solid slabs

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