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

Gomes, Carlos Eduardo Marmorato; Ferreira, Olga

doi:10.1590/s0104-14282005000300009

Cited by 30 publications

(19 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…During the hydration, hydrophilic part of the polymer was oriented towards the water phase whereas the hydrophobic part headed towards the air phase (pores and capillaries that were not filled with water). Upon drying which was on day 28, as the water taken away, the hydrophobic particles coalesced together to form film and block the pores hence the later occurrence of pore blocking effect [2,5]. On the other hand SAE copolymer is a reactive polymer where ester linkage can form crosslink with Ca 2+ ion preventing Ca(OH) 2 from leaching [2].…”

Section: Resultsmentioning

confidence: 99%

“…All samples were drycured in the concrete laboratory with average temperature (T) of 32ºC and relative humidity (RH) of 90%. [5,6].The water in the circle could vaporized or absorbed by the samples. On specified day, the surface of the samples was scraped to extract powder of 1 gram in weight.…”

Section: Methodsmentioning

confidence: 99%

“…The polymer spheres are small and can therefore block pores and capillaries and subsequently prevent water loss by reducing shrinkage. The plastic coating on the surface has a much greater resistance to the variety of chemical attack compared to the conventional mortar [1,[3][4][5]. A similar mechanism to shrinkage cases, capillary pores are blocked and thus reducing permeability that might cause the efflorescence phenomenon.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physicochemical characterization of polymer composite cement systems

Sutan

Yakub

Hamdan

2014

WIT Transactions on the Built Environment

View full text Add to dashboard Cite

The early hydration behaviour of two different polymer composites cement systems (PCCS) that hypothetically affects efflorescence has been investigated through physicochemical characterization namely Puddle Test (PT), Standard Chemical Method (SCM), Compressive Strength Test (CS), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). PCCS mortar samples were prepared with water-to-cement ratio (w/c) of 0.50. Commercially available polymer additives namely Styrene Butadiene Rubber (SBR) and Styrene Acrylic Ester (SAE) with different percentages of addition of 5%, 7% and 10% to cement were used. All samples were dried cured and tested at day 28. Efflorescence was accelerated by using PT. Its intensity, in terms of the amount of Calcium Carbonate (CaCO 3 ) precipitated on samples' surfaces, was quantified by using SEM. Results of the PCCS were then compared to the conventional cement system. Based on this study, PCCS can potentially reduce efflorescence where validation from CS, XRD analysis and SEM images showed that the evidence of the pore blocking effects of PCCS in early hydration hence can indirectly improve concrete durability and sustainability.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Physicochemical characterization of polymer composite cement systems

Sutan

Yakub

Hamdan

2014

WIT Transactions on the Built Environment

View full text Add to dashboard Cite

show abstract

“…Bands near 1420, 870, and 710 cm −1 may be attributed to the presence of carbonate phase while the shoulder near 1116 cm −1 is related to the sulphate phase. On the other hand, band near 920 cm −1 may refer to anhydrous calcium silicate (Figure 2(b)) [12,13]. It should be stated that an identical spectrogram is identified in the cement-waste form (Figure 2(c)).…”

Section: Resultsmentioning

confidence: 99%

Cementation of Bioproducts Generated from Biodegradation of Radioactive Cellulosic-Based Waste Simulates by Mushroom

Eskander

El-Aziz

El-Sayaad³

et al. 2012

ISRN Chemical Engineering

View full text Add to dashboard Cite

The current work was devoted to study the solidification of bioproducts originated from the bioremediation of mixture of solid cellulose-based radioactive waste simulates using a mushroom (Pleurotus pulmonarius), in Portland cement. The obtained solidified waste form was subjected to mechanical integrity qualification after curing periods of 28 and 90 days. Chemical performance of the cement-waste form was also evaluated in different leachant media during 540 days. The results obtained gave useful information about the mechanical, physical, and chemical performances of the final cement-waste form incorporated the radioactive bioproducts. Moreover, it indicated that cement can provide a highly durable form that ensures a long-term stability of the solidified waste material and can act as a first barrier against the release of radiocontaminants from radioactive wastes to the surrounding environment.

show abstract

“…The modification with redispersible polymer powders is similar to that of latex formation except that it also involves the redispersion of the polymer powders [8][9][10][11][12][13][14][15] . In these cases, the modification is governed by both Portland cement hydration and polymer film formation processes in their binder phase [16][17][18][19][20][21][22] .…”

Section: Polymer Additionmentioning

confidence: 99%

Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process

Gomes

Savastano

2013

Mat. Res.

View full text Add to dashboard Cite

Fiber cement, similarly to all cementitious materials, undergoes dimensional and volumetric changes when it is exposed to dry and wet environments. When exposed to natural weathering, cement-based materials absorbs and may also release water to their surroundings via a very complex inherent pore structure. In this work initialized a few years ago, some properties of asbestos-free fiber cement composites were studied, such as density, porosity and loss or absorption of water. For the understanding of the behavior of this material, modifiers were employed in the cement matrix such as styrene-acrylic, styrene-butadiene and vinyl acetate-versatic vinylester copolymers to verify their influence on the variables described above. All composites were analyzed by mercury intrusion porosimetry (MIP). For monitoring the expansion/shrinkage movements, the specimens were exposed inside a controlled environmental chamber with constant temperature and relative humidity (RH) during the test time. The results showed no interference on hygral behavior because particular casting process of these composites but, as showed by literature, increase of toughness. Also, it was possible to verify that moisture movement within the asbestos-free fiber cement can be very complex and the variables density and porosity (pore structure) play a very important role in the expansion/shrinkage properties of these composites.

show abstract

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

Cited by 30 publications

References 9 publications

Physicochemical characterization of polymer composite cement systems

Physicochemical characterization of polymer composite cement systems

Cementation of Bioproducts Generated from Biodegradation of Radioactive Cellulosic-Based Waste Simulates by Mushroom

Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process

Contact Info

Product

Resources

About