Recent progress in concrete-polymer composites

Ohama, Yoshihiko

doi:10.1016/s1065-7355(96)00005-3

Cited by 186 publications

(115 citation statements)

References 12 publications

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“…• 100 °C: dehydration of pore water • 100 -300 o C: different stages of C-S-H dehydration • ~500 °C: dehydroxylation of Ca(OH) 2 • ~700 °C: decarbonation of CaCO 3 As explained above, polymer modification reduces the quantity of Ca(OH) 2 formed in the mortars [10] . This work reports results of investigations in which methods of thermal analysis were applied to evaluate the effects of polymer modification on the hydration process of Portland cement by estimating Ca(OH) 2 content and calcium hydrates content.…”

Section: The Importance Of the Thermal Analyses The Importance Of Thementioning

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%

“…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%

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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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Section: The Importance Of the Thermal Analyses The Importance Of Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…The research works regarding development and potential contributions have been performed in many countries more than 70 years ago. As a result, polymer modifier mortar (PMM) or concrete (PMC) became most preferable materials for construction started in the 1970s in Japan and Europe meanwhile past a decade after in America for repairing, finishing, bridge deck overlays and patching purpose [4].…”

Section: Introductionmentioning

confidence: 99%

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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A Cement‐in‐Poly(Vinyl Alcohol) Dispersion for Improved Fibre‐Matrix Adhesion in Continuous Glass‐Fibre Reinforced Concrete

Weichold

Möller

2007

Adv Eng Mater

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A reactive coating for multifilament reinforcements consisting of non‐hydrated cement particles embedded in a water‐soluble polymer is presented. In contact with the wet cement‐paste, the polymer dissolves and exposes the non‐hydrated cement particles, which then react and crystallise. This enables the formation of a continuous, crystalline matrix between the filaments and leads to an increase of the load‐bearing cross‐section, a 3‐fold increase in the average pull‐out load and slip‐hardening during pull‐out.

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Recent progress in concrete-polymer composites

Cited by 186 publications

References 12 publications

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

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

Characteristics of patch-repaired RC under influenced of chloride ions

A Cement‐in‐Poly(Vinyl Alcohol) Dispersion for Improved Fibre‐Matrix Adhesion in Continuous Glass‐Fibre Reinforced Concrete

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