Chemical interaction between EVA and Portland cement hydration at early-age

Betioli, Andrea Murillo; Filho, Juarez Hoppe; Cincotto, Maria Alba; Gleize, Philippe Jean Paul; Pileggi, Rafael Giuliano

doi:10.1016/j.conbuildmat.2009.06.033

Cited by 74 publications

(31 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The E/VC/VL also enlarges the exothermic shoulder at 250-350°C at the hydration time of 0.5 to 72 h, which is similar to the effect of EVA at 28 d of hydration in literature [16]. But EVA does not affect the exothermic shoulder within 24 h of hydration [18], while the E/VC/VL has great influence on the endothermic reaction peak from the very beginning of hydration. And the E/VC/VL decreases the endothermic reaction peak intensity at 400-470°C of the Ca(OH) 2 decomposition, which is in agreement with the results of literature [18].…”

Section: Thermal Analysissupporting

confidence: 66%

“…Some researches contributed the length prolongation of the induction period and the delayed onset of the acceleration period to the adsorption of polymer particles on cement particles and the complexation effect of Calorimetric study on the influence of redispersible E/VC/VL terpolymer on the early… 1231 organic groups released by polymers with Ca 2? ions [15][16][17][18]28]. But fewer organic groups will be released by the E/VC/VL in fresh cement paste to complex with Ca 2?…”

Section: Isothermal Calorimetrymentioning

confidence: 97%

“…Literature [17] showed that the chemical interaction of EVA and ions occurs in cement pastes just after 1 d of hydration. But literature [18] reported that even at the first 15 min of hydration, the EVA hydrolyses occur and interact with Ca 2? ions to form calcium acetate and to reduce Ca(OH) 2 content.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Calorimetric study on the influence of redispersible E/VC/VL terpolymer on the early hydration of Portland cement

Zhang

Wang

et al. 2016

J Therm Anal Calorim

View full text Add to dashboard Cite

The effects of redispersible ethylene-vinyl chloride-vinyl laurate terpolymer (E/VC/VL) on the early hydration evolution of Portland cement were quantitatively investigated by isothermal calorimetry, setting time testing, thermal analysis, Fourier transform infrared spectroscopy, X-ray diffraction analysis and environmental scanning electron microscope analysis. The results show that the E/VC/VL definitely affects the early hydration process of cement paste, increases the initial exothermic peak value, decreases the heat evolution rate of the acceleration period and the second hydration exothermic peak, but increases the heat evolution rate during the deceleration period. And the E/VC/VL has little effects on the length of these different hydration periods. The E/VC/VL decreases hydration heat and hydration degree within 72 h, and the bigger the E/VC/VL dosage is, the less hydration heat and hydration degree are. The E/VC/VL retards the formation of hydrates, decreases the content of Ca(OH) 2 and CSH gels, affects the morphology evolution of hydrates and declines the crystalline degree and crystal size of Ca(OH) 2 . Besides, the E/VC/VL retards the formation of AFt and inhibits the conversion of AFt to AFm, accordingly keeping AFt content higher at later hydration time. In addition, no new phases are formed in cement paste with the E/VC/ VL. The retardation of E/VC/VL is also evidenced by the setting time of cement pastes. But with hydration time prolonging, the retardation of E/VC/VL on cement hydration gradually weakens.

show abstract

Section: Thermal Analysissupporting

confidence: 66%

Section: Isothermal Calorimetrymentioning

confidence: 97%

See 1 more Smart Citation

Calorimetric study on the influence of redispersible E/VC/VL terpolymer on the early hydration of Portland cement

Zhang

Wang

et al. 2016

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…Betioli et al [35] study chemical interaction between EVA and Portland cement hydration at its early age, during the first hours through TG/DTG. The polymer/cement ratio is between 5-10%, and water/cement ratio is constant at 0.38.…”

Section: Ethylene-vinyl Acetate Copolymermentioning

confidence: 99%

Chemical interaction between polymer and cement in polymer-cement concrete

Wang¹,

Li²,

Zhang³

et al. 2016

Bulletin of the Polish Academy of Sciences Technical Sciences

View full text Add to dashboard Cite

Abstract. Polymers are widely used in cement mortar and concrete modification due to their significant role in improving the overall performance of cement-based materials. Their physical interaction is well-accepted, while less attention is given to chemical interaction between the polymers and cement. Through a review of prior arts, chemical interactions are discussed and summarized in this paper. Various chemical interactions may take place between cement and different types of polymers. Understanding these chemical interactions will play an important role in clarifying the relationship between microstructure and macrostructure of polymer-modified cementitious materials. Authors expressed and proved the conviction that the organic-inorganic (Polymer-Portland cement) composite with some components chemically bonded, in parallel to the physical interaction, will be the next stage in concrete technology progress.Key words: Chemical interaction, polymer, Portland cement, concrete-polymer composites, polymer cement concrete.Chemical interaction between polymer and cement in polymer-cement concrete higher than 10% of cement mass. Because of the synergic action of polymers in concrete, their influence on the properties of the product is much higher than one could deduct from their mass/volume share [4]. We can observe several milestones on the road to building the PCC microstructure formation model [5]. Particularly Bares's model, Ohama model, and Beeldens-Ohama-Van Gemert integrated model should be stressed among others (Table 1).Years 2005-2009 have brought the breakthrough achievement of Van Gemert and Knapen [16,17]. If we use a water-soluble polymer (WSP) instead of a liquid polymer, due to the thermodynamic conditions, the WSP will be placed in the nano-area. As a result of changing the polymer position from micro-area into nano-area, the polymer will not be bridging between the crack-edges of concrete, but between the hexagonal plates of Portlandite [ Fig. 1]. In such situation, even an addition of polymer in the amount of 1% of cement mass will improve the tensile strength 50% more than with 10% polymer content in an ordinary situation.

show abstract

“…A reduction of 9.15% was found on compressive strength from 43.7MPa to 39.7MPa by adding the content of EVA. The polyethylene vinyl acetate (EVA) copolymer, usually as redispersible powder or latex, can be used to add into mortars or concretes to improve some properties such as fracture toughness, impermeability, bond strength, and deformability (Su et al 1991), due to the both physical and chemical interactions between EVA and Portland cement (Betioli et al 2009). However, these interactions only enhance the bond strength or adhesive strength, and can even have adverse effect on the compressive strength, as shown in this study.…”

Section: Strength Properties Of Hvfa Mortarsmentioning

confidence: 99%

Transport Properties of High Volume Fly Ash Mortar with Various Chemical Admixtures

Du¹,

Shi²,

Ge³

et al. 2017

dtetr

View full text Add to dashboard Cite

ABSTRACT:The transport properties of concrete-and mortar are important indicators of their durability, and may be correlated to their resistance to salt scaling. This work aims to optimize the transport properties of the high volume fly ash (HVFA) mortar in which 60% (by weight) Portland cement was replaced by Class C fly ash. Ten chemical admixtures (five non-polymers and five polymers) were investigated as waterproof admixtures for HVFA mortar. The compressive strength, splitting tensile strength water sorptivity and gas permeability of the mortar admixed with these chemical admixtures were investigated. The results showed that the non-polymer and polymer admixtures with different admixing dosages played different roles in HVFA mortar. This consequently resulted in different behavior in affecting the transport and mechanical properties of HVFA mortars.

show abstract

Chemical interaction between EVA and Portland cement hydration at early-age

Cited by 74 publications

References 10 publications

Calorimetric study on the influence of redispersible E/VC/VL terpolymer on the early hydration of Portland cement

Calorimetric study on the influence of redispersible E/VC/VL terpolymer on the early hydration of Portland cement

Chemical interaction between polymer and cement in polymer-cement concrete

Transport Properties of High Volume Fly Ash Mortar with Various Chemical Admixtures

Contact Info

Product

Resources

About