Synthesis of chemically controlled cementitious materials using organic steric entrapment (OSE) method: Process, advantages, and characterisation

Hamdan, Abdelrahman; Kim, Tae‐Hwan; Hajimohammadi, Ailar; Alnahhal, Mohammed Fouad; Rawal, Aditya

doi:10.1016/j.cemconres.2021.106698

Cited by 7 publications

(2 citation statements)

References 56 publications

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“…To understand the effects of such oxides on the reactivity of AAMs, fundamental studies were carried out using industrial samples [12][13][14][16][17][18][19] as well as simplified synthetic glasses consisting only of the four main oxides [15]. A recent study [23] provided a method to synthesise chemically controlled cementitious materials. In addition to the four main oxides, minor quantities of Fe 2 O 3 , SO 3 , TiO 2 , Na 2 O, and others may present in industrial slags.…”

Section: Introductionmentioning

confidence: 99%

“…Synthetic glasses containing controlled quantities of minor oxides were also prepared to investigate the impact of such oxides on the reactivity of sodium silicate-activated materials [20]. However, despite the precise chemical composition and the similar range of surface area, it was difficult to precisely control the surface areas of glasses after grinding [23].…”

Section: Introductionmentioning

confidence: 99%

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Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Hamdan¹,

Kim

Hajimohammadi³

2022

RILEM Tech Lett

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The effects of chemical oxides and the surface area (SA) of slags on the initial reactivity of alkali-activated materials (AAMs) are coupled. It is well known that the reactivity of slag in AAMs is impacted by the SA, however, a quantitative measure of this effect was not provided in previous studies. For a proper understanding of the effect of slag chemistry on the reaction kinetics of AAMs, a quantitative description of the slags SA's effect is required. The reaction kinetics in the activated slags were monitored using isothermal calorimetry. The SAs of the pulverised slags were linked to the time-to-reach-the-main-peak (TTRP) of the reaction, the slope of the acceleration part of the main peak, and the total heat at one, three, and seven days. A 100% relative increase in SA caused a ~51%-75% relative decrease in TTRP. The slope of the acceleration stage also considerably increased with the SA of the slags. However, the effect of the SAs on the total heat was only distinct up to three days and then considerably reduced at seven days. The result of this study indicates that the effect of SA on the initial reactivity of AAMs cannot be simply considered using the proportional contribution. The outcome of this study can provide a promising measure to decouple the effects of SAs and the chemical compositions of slags on the reaction kinetics of AAMs by providing quantitative results for the effect SAs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Hamdan¹,

Kim

Hajimohammadi³

2022

RILEM Tech Lett

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Influence of phosphates on phase formation in alkali‐activated MgO‐Al₂O₃‐SiO₂‐P₂O₅ cements

Reed,

Mauro,

Gevaudan

2024

Int J Ceramic Engine & Sci

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The impact of phosphates on phase formation in low Ca alkali‐activated materials (AAMs) is investigated using a polymer‐assisted sol‐gel process to fabricate MgO‐Al2O3‐SiO2‐P2O5 cement precursors covering a broad range of compositions activated with sodium hydroxide. X‐ray diffraction and magic angle spinning‐nuclear magnetic resonance are used to examine the crystalline and amorphous phases that form over 470 days of curing (35°C, 90% relative humidity). The results confirm that Al is preferentially incorporated into hydrotalcite‐like layered double hydroxides (LDH) over zeolites. Zeolites form when more Al is present than can be incorporated into the LDH. Little evidence of phosphate incorporation into aluminosilicate networks (such as zeolites or disordered aluminosilicate hydrate) was observed. The phosphates present in the precursor favor reaction with sodium to form water‐soluble sodium phosphate phases. In most cases, the remainder of the phosphates become adsorbed to the surface of other phases and are not intercalated into the LDH, though at high phosphate concentrations (26.6 wt. % P2O5) and extended curing times (470 days), phosphates are observed to intercalate into LDH phases. These results provide preliminary evidence that phosphates are compatible with low Ca AAMs, which is consequential as there is a growing interest in both the use of AAM and phosphate‐based corrosion inhibiter in steel‐reinforced concrete.

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Effect of silica particle size and coating by natural latex on properties of styrene‐butadiene rubber/carbon black/silica composites

Liang,

Luo,

Zhong

et al. 2024

Polymer Composites

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Silica is a renewable resource that has become the primary filler for the rubber used in eco‐friendly tires. However, silica tends to agglomerate in the rubber matrix, particularly, micro‐ and nano‐scale silica, which limits its application. When ordinary‐particle‐size silica with low cost and high stacking density is modified using appropriate methods, high dispersion in rubber and good performance can be achieved with common processing equipment, which has significant engineering application value. In this study, silica particles with different sizes (nano‐scale, 19 and 45 μm) were treated with a 3‐mercaptopropyltriethoxysilane coupling agent (KH580). Subsequently, the silica with the ordinary particle size of 300 mesh (45 μm) was coated with natural latex (NL), and the mechanical properties of the modified silica‐filled styrene‐butadiene rubber (SBR)/carbon black (CB) compounds were investigated. The results revealed that the mechanical properties of the NL‐coated 45 μm silica‐filled composite improved significantly, particularly, in the area of tear strength and elongation at break, the composite properties were improved by 17.1% and 118.2%, respectively. Excellent performance over composites filled with coupling agent‐treated micron‐ and nanoscale silica. Enhancing the surface modification of silica through latex coating provides a means to improve the efficiency of industrial production and reduce costs.Highlights The low‐fine silica treated with KH580 has good dispersibility. Improved mechanical compatibility of NL‐coated silica with rubber. Improvement in strain performance of composites after NL coated with silica. The effect of silica dispersion on composite properties is greater than the effect of particle size. Industrial silica can be successfully addressed, paving the way for extensive utilization.

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Synthesis of chemically controlled cementitious materials using organic steric entrapment (OSE) method: Process, advantages, and characterisation

Cited by 7 publications

References 56 publications

Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Influence of phosphates on phase formation in alkali‐activated MgO‐Al₂O₃‐SiO₂‐P₂O₅ cements

Effect of silica particle size and coating by natural latex on properties of styrene‐butadiene rubber/carbon black/silica composites

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Synthesis of chemically controlled cementitious materials using organic steric entrapment (OSE) method: Process, advantages, and characterisation

Cited by 7 publications

References 56 publications

Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Quantitative description of the effect of slag surface area on its reaction kinetics in sodium silicate-activated materials

Influence of phosphates on phase formation in alkali‐activated MgO‐Al2O3‐SiO2‐P2O5 cements

Effect of silica particle size and coating by natural latex on properties of styrene‐butadiene rubber/carbon black/silica composites

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Influence of phosphates on phase formation in alkali‐activated MgO‐Al₂O₃‐SiO₂‐P₂O₅ cements