The Effect of Porous Pozzolanic Polydisperse Mineral Components on Properties of Concrete

Markiv, Taras; Sobol, Khrystyna; Petrovska, Nadiya; Hunyak, Oleksii

doi:10.1007/978-3-030-27011-7_35

Cited by 13 publications

(4 citation statements)

References 16 publications

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“…It was found that increasing the gypsum additive content up to 20 wt % negatively affects the strength of the binder (Table 2). This is due to the formation of ettringite 3CaO•Al 2 O 3 •3CaSO 4 •31H 2 O in the excess amount which causes the destructive processes in the hardening system [15]. Further study was aimed at achieving the double effect: extending setting time while maintaining the positive role of gypsum in the processes of early structure formation.…”

Section: Resultsmentioning

confidence: 99%

“…The aim of this work is to study the possibility of obtaining hydraulically active binder systems based on ash and slag waste, which are formed during the incineration of wastepaper sludge as a new type of man-made raw materials. The use of heat-treated wastepaper sludge is a promising trend for fuel and energy savings and reducing the natural resources consumption as well as greenhouse gas emissions [7,8,[13][14][15][16]. This approach complies with the priority principles of uniform and sustainable development of the industry aimed at creating environmentally friendly low energy-intensive technologies.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Phan¹,

Dang²,

Nguyen-Dinh³

2020

ChChT

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Hydrophobic porous polymeric materials have attracted great interests recently as potential candicate for oil-water separation due to their high selectivity and sorption capacity. Herein, we present a green, simple and cost-effective method to change hydrophilic melamine formaldehyde (MF) foam to hydrophobic carbon nanotubes (CNTs) coated MF foam through an immersion process. The MF foam was produced from the MF resin which was synthesized in a laboratory by a condensation reaction between melamine and formaldehyde under alkaline condition with a molar ratio of melamine to formaldehyde of 1:3. The MF foam has an open-cell structure with the average pore diameter of 350 m, density of 25 kg •m-3 and porosity of 98 %. The as-prepared CNTs-coated MF foam exhibits high sorption capacity (23–-66 g/g) for oils and organic solvents, good recyclability and high selectivity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Phan¹,

Dang²,

Nguyen-Dinh³

2020

ChChT

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“…Efficiency of high early strength multicomponent cements based on ground blast furnace slags (further, GBFS), zeolite and fly-ash in mortars was shown [5]. Additives of polydisperse zeolite tuff and perlite provide positive effect on concrete strength in different conditions [6]. Addition of zeolite or highly dispersed chalk enhances strength of cements [7], as well as crack resistance [8] and freeze-thaw resistance of concretes [9].…”

Section: Introductionmentioning

confidence: 99%

Prevention of steel reinforcement corrosion in alkali-activated slag cement concrete mixed with seawater

et al. 2021

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Concretes mixed with seawater are characterised by enhanced performances, but action of chlorides and sulfates ensures the risk of reinforcement corrosion. Application of high consistency fresh concretes ensures changes in hardened concrete structure that causes the problem of steel reinforcement passive state ensuring. Thus mixing of plasticized concretes by seawater actualizes the search for means of steel corrosion prevention. Alkali-activated slag cements (further, AASC’s) reduce effect of ions Cl− and SO42− on steel reinforcement in concrete due to their exchange for ions OH− in the structure of zeolite-like alkaline hydroaluminosilicates. Complex additive «portland cement - calcium aluminate cement - clinoptilolite» was proposed to enhance the protective properties of AASC concretes to steel reinforcement. The results of DTA, X-ray diffraction, electron microscopy, microprobe analysis show that complex additive ensures to prevent steel reinforcement corrosion in AASC concrete mixed with seawater due to binding Cl− and SO42− ions in Kuzel’s salt in AASC hydration products and exchange of these aggressive ions with OH− ions in the structure of clinoptilolite. This effect of complex additive confirmed by surface state and the absence of mass loss of steel rebars embedded in plasticized AASC fine concrete mixed with seawater after 90 d of hardening.

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“…In this case, the absence of conditions for reinforcement depassivation is ensured when a value of the ratio is Cl -/OH -≤0. 6. This circumstance predetermines a decrease in the content of BP in the SC composition and requires the introduction of an additional modifying component -CAA.…”

mentioning

confidence: 99%

Design of slag cement, activated by Na (K) salts of strong acids, for concrete reinforced with steel fittings

Kryvenko

Rudenko

Konstantynovskyi

2020

EEJET

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The Effect of Porous Pozzolanic Polydisperse Mineral Components on Properties of Concrete

Cited by 13 publications

References 16 publications

Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Prevention of steel reinforcement corrosion in alkali-activated slag cement concrete mixed with seawater

Design of slag cement, activated by Na (K) salts of strong acids, for concrete reinforced with steel fittings

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