Water-entrained cement-based materials

Jensen, Ole Mejlhede; Hansen, Poul Henrik Kyvsgaard

doi:10.1016/s0008-8846(01)00463-x

Cited by 799 publications

(186 citation statements)

References 3 publications

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“…These microstructural features resemble that of the paste-aggregate interface in typical concretes. However, the moisture released by SAP is expected to promote further hydration and microstructure development in the surrounding paste 9,10 .…”

Section: Microscopymentioning

confidence: 99%

“…Other applications of SAP include biomedical (bandages, surgical sponges), agricultural (soil conditioning, erosion control), waste solidification, meat packaging and water blocking tapes for undersea cables 5 . In concrete technology, the application of SAP for enhancing strength and workability 7 , preventing drying shrinkage cracking and leakage through cracks 8 , and internal curing 9,10 have been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…For example, its free swelling ratio, which is the water uptake by mass of dry SAP, can be up to 5,000gg -1 in deionised water, but reduces significantly with increasing ionic concentration of the solution, e.g. ~50gg -1 in urine and ~10gg -1 in concrete pore solution 9,10 . Furthermore, the swollen SAP gel forms a barrier to flow 5,17 , and it is this property that is exploited for sealing cracks.…”

Section: Introductionmentioning

confidence: 99%

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Potential of superabsorbent polymer for self-sealing cracks in concrete

Lee

Wong

Buenfeld

2010

Advances in Applied Ceramics

166

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The potential of conventional superabsorbent polymers (SAP) based on partially neutralised acrylate and acrylate/acrylamide copolymers as an admixture for self-sealing of cracks in concrete is investigated. SAP are crosslinked polymers that can absorb a disproportionately large amount of liquid and swell substantially to form a soft and insoluble gel. However, their swelling capacity is highly dependent on the alkalinity and ionic content of the solution. These characteristics may be exploited for self-sealing cracks in concrete. In this preliminary study, the mechanism involved is described and tests performed to determine the swelling ratios of SAP in various solutions including synthetic pore solution, groundwater and seawater are reported. Transport testing found that the flow rate through a 340μm wide model crack is reduced substantially by using less than 1% vol. SAP. The re-swelling capacity of SAP in cement paste and the effect of SAP on cement paste microstructure were investigated by microscopy.

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Section: Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potential of superabsorbent polymer for self-sealing cracks in concrete

Lee

Wong

Buenfeld

2010

Advances in Applied Ceramics

166

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“…superabsorbent polymer (SAP) particles or saturated lightweight fine aggregates (LWA), e.g. (Bentur et al, 2001;Bentz and Weiss, 2011;Jensen and Hansen, 2001;Kovler et al, 2007).…”

Section: Internal Curingmentioning

confidence: 99%

Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

Jafariesfad

Geiker

Gong

et al. 2017

Journal of Petroleum Science and Engineering

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Well cementing is an important operation during drilling and completion of oil wells. The cement sheath must maintain well integrity behind the casing and provide long-term zonal isolation to ensure safety and prevent environmental problems. Despite recent technological advancement in smart polymeric materials, fibers and self-healing materials, it is still a big challenge to provide adequate long-term zonal isolation in severe oil well conditions. This review provides an overview of challenges faced in oil wells compromising the long-term ability of the cement sheath to provide zonal isolation. Factors controlling the long-term performance of cement sheath are discussed, in terms of shrinkage, tensile strength and flexibility. The use of nanomaterials as cement additive to fabricate flexible, high-tensile strength, and low-shrinkage cement system are reviewed.Introduction of nanomaterials into the cement system is a promising approach to design a sealant for the entire life of the well, thereby avoiding potential remedial costs and environmental impacts.

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“…Philleo [7] suggested incorporating presoaked lightweight aggregate (LWA) in concrete to provide an internal source of water necessary to accommodate that consumed by cement hydration. Since then, a lot of research has been carried out in this area and LWAs [2,3,[8][9][10][11][12][13][14][15][16], super absorbent polymers [17][18][19] and recycled aggregates [20,21] were reported as appropriate IC agents. Bentz and Snyder [22] and Jensen and Hansen [17] proposed equations to determine and quantify the amount of water or LWA needed for IC.…”

Section: Introductionmentioning

confidence: 99%