Polymer-based admixtures

Ohama, Yoshihiko

doi:10.1016/s0958-9465(97)00065-6

Cited by 440 publications

(218 citation statements)

References 13 publications

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“…Overall, it can be said that total chloride diffusivity is about two times to the free chloride diffusivity with repaired R-0.4OPC specimen shows the highest amount of both free and total chloride ions compared to R-PMM specimen because of different in water content that makes Cl -high in dilution. Least amount Cl -detected in R-PMM specimen can be correlated with explanation made by [11] regarding the formation of co-matrix due to reaction occurred during mixing process between polymer-based admixture and cementitious composites. The hydration and polymer film formation generates a monolithic matrix phase that makes network structure in cement hydrate phase and polymer phase merged together.…”

Section: Chloride Ions Distributionsupporting

confidence: 64%

Characteristics of patch-repaired RC under influenced of chloride ions

Malek¹,

Hattori²,

Kawano³

et al. 2017

AIP Conference Proceedings

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Abstract.One of the key performances of repaired reinforced concrete is its ability to withstand corrosion due to harmful ions and should be compatible with substrate and repaired concrete structures. This research investigates the prediction of corrosion risk on repaired RC by comparing performance between PMM and conventional OPC as chosen materials for repairing RC structures under influenced of chloride ions. The effect of chloride ions on repaired RC will be analyzed according to microstructural analysis, half-cell potential and chloride content by weight of cement. For analysis, substrate concrete containing 9 kg/m 3 chloride ions with W/C ratio 60% acts as the reference specimen. Meanwhile, for comparison purpose; two conditions of repaired RC namely OPC with W/C ratio 40% (R-0.4OPC) and PMM (R-PMM) that contain chloride free ions using similar casting and curing techniques were prepared respectively. Based on the results obtained, porosity and microstructural images using BSE were alternated under influenced of chloride ions since it correlated with surface charge of CSH due to Ca/Si amount in each specimen. The correlation between free and total chloride ions in concrete reveals the phenomena of co-matrix in R-PMM specimen since least chloride ions found in repaired section compared to R-0.4OPC specimen. The most striking result is R-PMM specimen able to resist chloride ions ingress in its repaired section but for HCP results obtained the R-PMM specimen beyond its threshold of passivity even though its porosity value is the lowest. To sum up, penetration of chloride ions throughout the specimens according to the wet chemical analysis giving effects to the porosity and microstructure. The R-PMM specimen was good in resistance of chloride ions to the repaired part but it was not the final predictions on its ability to withstand corrosion resistance.

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Section: Chloride Ions Distributionsupporting

confidence: 64%

Characteristics of patch-repaired RC under influenced of chloride ions

Malek¹,

Hattori²,

Kawano³

et al. 2017

AIP Conference Proceedings

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“…Upon drying, the water is taken away, the hydrophobic particles coalesce together and form film. The other theory is that some chemical reactions may take place between the particle surfaces of reactive polymers (such as polyacrylic esters (PAE) and calcium ions Ca 2+ ), Ca(OH) 2 and solid surfaces or silicate surfaces over the aggregates. This creates a type of reinforcement in the concrete and that will produces semipermeable membranes [1] .…”

Section: Interaction Between P Interaction Between P Interaction Betwmentioning

confidence: 99%

“…In the last 30 years, several publications have shown the benefit of polymer addition in the properties of the Portland cement composite such as strength, deformability, adhesion, waterproofness and durability [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

“…There are several kinds of polymeric compounds for applications in concretes such as polymer latex, redispersible polymer powder, water-soluble polymer and liquid polymer [2][3][4] . Because of the easy application [3] , the redispersible polymers are commonly used in the composites, such as the poly(ethylene-vinyl acetate) -EVA, poly(styreneacrylic ester) -SAE, the polyacrylic ester -PAE and poly(vinyl acetate-vinyl versatate) -VA/VeoVA.…”

Section: Introductionmentioning

confidence: 99%

“…This patent refers to the use of cement as filler in a polymer matrix. In 1924, the first patent was published using the concept of polymer modification for cement mortar and concrete [2,4,6] .…”

Section: Introductionmentioning

confidence: 99%

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Analyses of microstructural properties of VA/VeoVA copolymer modified cement pastes

Gomes

Ferreira

2005

Polímeros

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Abstract:Recently, modern techniques have been applied for analysis of the influence of polymers on microstructural properties of Portland cement, such as Thermogravimetric Analyses (TG), Scanning Electronic Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and Mercury Intrusion Porosimetry (MIP). In this study, thermogravimetric analyses were used to study the influence of vinyl acetate-versatic vinylester copolymer (VA/VeoVA) in seven pastes of 28-day old Portland cement, in which distinct polymer contents and water/cement ratios were employed. In addition, analyses of FT-IR and MIP on Portland cement pastes modified by the copolymer were employed. The results showed that the addition of polymer interferes significantly in the reduction of Portlandite formation and increases the porosity of the matrices. A possible chemical interaction between the copolymer and hydrated products of Portland cement was also observed.

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Die Bildung von Nanopartikeln und Nanostrukturen – CaCO₃, Zement und Polymere aus Sicht der Industrie

Rieger

Kellermeier

Nicoleau³

2014

Angewandte Chemie

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Nanotechnologie ermöglicht die Herstellung von Materialien mit hervorragenden Leistungscharakteristika. Ein Schlüsselelement der Nanotechnologie ist die Fähigkeit, Materie auf der Nanoskala zu manipulieren und zu steuern, um einen gewünschten Mix aus spezifischen Eigenschaften zu erhalten. Hier stellen wir jüngste Erkenntnisse zu den Bildungsmechanismen von anorganischen Nanopartikeln im Rahmen von Fällungsreaktionen vor. Am Beispiel von Calciumcarbonat beschreiben wir die verschiedenen Zwischenstufen, die auf dem Weg von den gelösten Ionen bis zu stabilen Makrokristallen auftreten können – einschließlich gelöster Ionencluster, flüssiger Phasen, amorpher Zustände und Nanopartikeln. Die Rolle von Polymeren bei der Nukleation, Templatierung, Stabilisierung und/oder Verhinderung dieser Strukturen wird skizziert. Als Beispiel für angewandte Nanotechnologie diskutieren wir die Eigenschaften von Zement, die durch die Bildung und das Ineinandergreifen von Calcium‐Silikat‐Hydrat‐Nanoplättchen festgelegt werden. Die Aggregation dieser Plättchen hin zu mesoskaligen Gebilden kann mithilfe von Polymeren gesteuert werden.

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Polymer-based admixtures

Cited by 440 publications

References 13 publications

Characteristics of patch-repaired RC under influenced of chloride ions

Characteristics of patch-repaired RC under influenced of chloride ions

Analyses of microstructural properties of VA/VeoVA copolymer modified cement pastes

Die Bildung von Nanopartikeln und Nanostrukturen – CaCO₃, Zement und Polymere aus Sicht der Industrie

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Polymer-based admixtures

Cited by 440 publications

References 13 publications

Characteristics of patch-repaired RC under influenced of chloride ions

Characteristics of patch-repaired RC under influenced of chloride ions

Analyses of microstructural properties of VA/VeoVA copolymer modified cement pastes

Die Bildung von Nanopartikeln und Nanostrukturen – CaCO3, Zement und Polymere aus Sicht der Industrie

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Product

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Die Bildung von Nanopartikeln und Nanostrukturen – CaCO₃, Zement und Polymere aus Sicht der Industrie