Phase composition changes due to ammonium-sulphate: attack on Portland and Portland fly ash cements

Miletić, Srđan; Ilić, M.; Otović, Slobodan; Folić, Radomir; Ivanov, Yatchko

doi:10.1016/s0950-0618(99)00017-3

Cited by 25 publications

(12 citation statements)

References 4 publications

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“…It can be concluded that adding PET to blended portland cement makes this cement become more resistant to the ammonium-sulfate aggressive environment. It is evident that the resistance of cement to sulfate aggression is also related to the content of C 3 A in them [27]. However, no pertinent data were found concerning the effect of PET against ammonium sulfate attack.…”

Section: Ammonium Sulfate (Nh 4 ) 2 So 4 and H 2 So 4 Attacksmentioning

confidence: 99%

Studies on Chemical Resistance of PET-Mortar Composites: Microstructure and Phase Composition Changes

Benosman¹,

Mohamed²,

Taïbi³

et al. 2013

ENG

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Researches into new and innovative uses of waste plastic materials are continuously advancing. These research efforts try to match society's need for safe and economic disposal of waste materials. The use of recycled plastic aggregates saves natural resources and dumping spaces, and helps to maintain a clean environment. The present articles deals with the resistance to chemical attack of polymer-mortars, which are often used as low-cost promising materials for preventing or repairing various reinforced concrete structures. To gain more knowledge on the efficiency of polymer-mortar composites, four mortar mixtures: one specimen with Portland cement and three mixtures with 2.5, 5, and 7.5 wt% of the substitution of cement by polyethylene terephthalate (PET) were exposed to the influence of aggressive environment (0.5%, 1% and 1.5% HCl acids, 10% NH 4 Cl, 5% H 2 SO 4 acid and 10% (NH 4) 2 SO 4 solutions). The measurements of several properties were carried out, the results were analyzed and the combination of X-ray diffraction, FT-IR spectroscopy, differential thermal analysis (DTA), thermogravimetric (TG) analysis, differential scanning calorimetry (DSC) analysis and the composites were also observed by SEM led to the positive identification of the deterioration products' formation. From this study, it was found that the addition of PET to the modified mortars, means reducing the penetration of aggressive agents. So, the PET-modified mortars exposed to aggressive environments showed better resistance to chemical attack. The new composites appear to offer an attractive low-cost material with consistent properties. The present study highlights the capabilities of the different methods for the analysis of composites and opened new way for the recycling of PET in polymer-mortars.

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Section: Ammonium Sulfate (Nh 4 ) 2 So 4 and H 2 So 4 Attacksmentioning

confidence: 99%

Studies on Chemical Resistance of PET-Mortar Composites: Microstructure and Phase Composition Changes

Benosman¹,

Mohamed²,

Taïbi³

et al. 2013

ENG

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“…It can be concluded that adding waste PET volume fractions (6%, 12% and 17%) to blended Portland cement renders this cement more resistant to the sodium sulphate aggressive medium. It is evident that the resistance of cement to sulphat to its content in C 3 A [22].…”

Section: Cmss-2017mentioning

confidence: 99%

Prediction models of mechanical properties for pet-mortar composite in sodium sulphateaggressive mediums

et al. 2018

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Abstract. In this research, an investigation was carried out on the effect of sodium sulphate attack on the durability of composites produced with waste polyethylene terephthalate (PET). Experiments were accomplished on limestone sand and cement mortars where the blended Portland cement was partially replaced by various volume fractions of waste PET particles (6%, 12% and 17%). The test solutions used to supply the sulphate ions and cations were 5%sodium sulphate solution. Compressive strengths measured on specimens were used to assess the changes in the mechanical properties of PET-mortars exposed to sulphate attack at different ages, mainly the Young modulus of elasticity. Based on experimental compressive tests on PETMortar composite specimens and there densities, the evolution of Young modulus of elasticity has been analyzed in accordance with normative models given by (ACI-318) and (BS-8110) codes of practice. In addition, a comparative study has been carried out for corrosion resistance coefficients K of unmodified mortar to those modified with waste PET particles. It can be noticed that, for the composite immersed in a corrosive Na 2 SO 4 solution, the corrosion resistance coefficients decrease with the increase of the immersion period. The corrosion sulphate resistance K based on Young modulus before and after immersion of PET-mortar composites is better than that of the control mortar. Therefore, for safety considerations of PET-mortar composites use, ACI 318 is recommended code for design and investigation works. Also, it can be concluded that adding waste PET by volume fractions (6%, 12% and 17%) to blend Portland cement renders this cement more resistant to the sodium sulphate aggressive medium. Therefore, composites materials based waste PET are often presented as the materials of the future because of their potential for innovation and the advantages they offer. In fact, using waste PET as cement substitutes reduces the energy consumption. These modified mortars address problems related to environmental pollution by CO 2 emissions, and are used to repair various reinforced concrete structures in sodium sulphate aggressive mediums.

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“…Normally, the indoor tests [74][75][76][77][78][79][80] always showed that the mineral additions can improve the sulfate resistance of cementitious materials based on the full immersion in 5% sulfate solutions stored at 23.0 ± 2.0°C. However, the long term field tests showed that the mineral additions accelerated the concrete decay.…”

Section: Study Of the Role Of Mineral Additions In "Salt Weathering" mentioning

confidence: 99%

“…The pore size refinement due to mineral additions will prevent the sulfates to penetrate into concrete and lighten the negative effect of sulfate attack on concrete. Therefore, a number of previous researches all supported the idea that the mineral additions, such as fly ash, slag powder, silica fume and metakaolin, play a positive role in making sulfate-resisting concrete [74][75][76][77][78][79][80] , not depending on the exposure conditions (sodium sulfate, magnesium sulfate, or ammonium sulfate).…”

Section: Study Of the Role Of Mineral Additions In "Salt Weathering" mentioning

confidence: 99%

"Salt Weathering" Distress on Concrete by Sulfates?

Liu¹,

Schutter²,

Deng³

et al. 2012

Advances in Crystallization Processes

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Phase composition changes due to ammonium-sulphate: attack on Portland and Portland fly ash cements

Cited by 25 publications

References 4 publications

Studies on Chemical Resistance of PET-Mortar Composites: Microstructure and Phase Composition Changes

Studies on Chemical Resistance of PET-Mortar Composites: Microstructure and Phase Composition Changes

Prediction models of mechanical properties for pet-mortar composite in sodium sulphateaggressive mediums

"Salt Weathering" Distress on Concrete by Sulfates?

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