A novel magnesium hydroxide sulfate hydrate whisker-reinforced magnesium silicate hydrate composites

Zhang, Tingting; Li, Tong; Zhou, Ziyu; Li, Min; Jia, Yuan; Cheeseman, Christopher

doi:10.1016/j.compositesb.2020.108203

Cited by 29 publications

(11 citation statements)

References 40 publications

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“…Hydrated magnesium silicate gel (M-S-H) samples were prepared according to different MS-MRs, as shown in Table 2. Specifically, the following experimental steps were followed [19][20][21]. First, different masses of MgO and SF powders were mixed by a hand mixer for 10 min.…”

Section: Sample Preparationmentioning

confidence: 99%

Evolution mechanism of the low-carbon MgO-based alkali-activated system under different heat-treatment conditions

Jiang,

Jia,

Zou

et al. 2023

Materials Science and Technology

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Magnesium silicate hydrate (M-S-H) gel is the main product of MgO-based alkali-activated system (MAAS). The molecular structure and phase changes of M-S-H gel at different temperatures were characterised. The results showed that the initial MgO:SiO2 affected the Mg:Si ratio and the binding water content of M-S-H gel. With the decrease of Mg:Si ratio, the proportion of structural water in the gel decreases. Compared with structured water, the change of free water can more accurately characterise the content of M-S-H gel in the system. Below 600°C, the molecular structure and phase composition are relatively stable. When the temperature reached 1000°C, M-S-H gel transfers from amorphous phase to crystallized phase. The study characterised the evolution of MASS under different heat treatment conditions.

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Section: Sample Preparationmentioning

confidence: 99%

Evolution mechanism of the low-carbon MgO-based alkali-activated system under different heat-treatment conditions

Jiang,

Jia,

Zou

et al. 2023

Materials Science and Technology

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“…In a series of applications, reactive MgO cement (RMC) [1][2][3] is gaining growing interest as it can be an alternative to ordinary Portland cement (OPC), 4,5 and using RMC reveals two benefits: (1) the lower energy consumption due to its lower calcination temperature than OPC [6][7][8][9] ; (2) its great CO 2 sequestration potential that could store CO 2 permanently. [10][11][12] However, due to the very limited strength gained by brucite (the hydration phase of MgO) in an ambient environment, 13 accelerated carbonation has been introduced to enhance the mechanical performances of RMC-based samples, which is through the reaction between brucite and CO 2 so that hydrated magnesium carbonates (HMCs) could form such as nesquehonite (MgCO 3 ⋅3H 2 O) and hydromagnesite (4MgCO 3 ⋅Mg(OH) 2 ⋅4H 2 O).…”

Section: Introductionmentioning

confidence: 99%

Understanding the role of seeds in reactive magnesia cement (RMC) formulations

et al. 2023

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Nucleation effects of seeds in reactive magnesia cement (RMC) systems have been reported, but this process has never been directly observed. In this study, different types and contents of seeds were introduced in RMC formulations. Resultsshow that seeded RMC samples revealed accelerated hydration/carbonation that led to their more rapid strength development, and the use of magnesite outperformed other seeds given their overall performances, as explained by their more homogenous microstructures. Further, in the model solution, the amount of Mg2+ ions adsorbed onto seeds particles continuously increased with the increment of Mg2+ concentrations, confirming the nucleation effects of seeds in RMC formulations directly, and seeds surfaces revealed a much higher affinity for Mg2+ ions than other ions due to their acid-base interactions. Therefore, the use of seeds could act as accelerators that shorten the curing period of RMC-based concrete products on a large scale.

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“…Magnesium sulfate whisker (5 Mg(OH) 2 ·MgSO 4 ·3H 2 O) is an environmental‐friendly and economically attractive filler 12,13 . Recently, it has been widely used to reinforce rubbers and plastics because of its high tensile strength, modulus, and large aspect ratio (50–250) compared with other reinforcement fillers such as glass fiber and carbon fiber to prepare polymer composites, especially in the automobile industry 14 …”

Section: Introductionmentioning

confidence: 99%

“…12,13 Recently, it has been widely used to reinforce rubbers and plastics because of its high tensile strength, modulus, and large aspect ratio (50-250) compared with other reinforcement fillers such as glass fiber and carbon fiber to prepare polymer composites, especially in the automobile industry. 14 In a recent study, an attempt was made to prepare composites of silicone rubber, EVM rubber, and magnesium sulfate whisker by melt blending. Moreover, EAA was used to improve the mechanical properties of composites by improving interfacial interactions between silicone rubber and EVM.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties, thermal stability, and thermal degradation kinetics of silicone rubber/ethylene‐vinyl acetate copolymer/magnesium sulfate whisker composites compatibilized by ethylene‐acrylic acid copolymer

Zia-Ul-Haq

Haq

et al. 2022

J of Applied Polymer Sci

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Silicone rubber/ethylene‐vinyl acetate copolymer/magnesium sulfate whisker composites containing ethylene‐acrylic acid copolymer (MS/SR/EVM/EAA) as a compatibilizer were successfully prepared. Moreover, the magnesium sulfate whisker surface was modified with 3 wt% of silane coupling agent (KH570), resulting in composites including (unmodified magnesium sulfate whisker) uMS/SR/EVM, (modified magnesium sulfate whisker) mMS/SR/EVM, and mMS/SR/EVM/EAA were compared. The values of thermal decomposition activation energy (Ea) calculated by the two different methods (Kissinger and Friedman methods) show that the composites filled with 5 and 20 phr whiskers have lower values of activation energy (Ea) than the SR/EVM blend. The tensile strength of composites with a 5 phr modified whisker is 14.5 MPa, which is higher than that of the SR/EVM blend and uMS5/SR/EVM composite. The tear strength of the composite with 20 phr mMS is 51.6 kN m−1, much higher than that of the composite with 20 phr uMS and SR/EVM blend. The mechanical properties were also investigated after thermal aging of the composites at 85°C for 48 h. The thermal conductivity of the composites with high filler loading was studied.

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A novel magnesium hydroxide sulfate hydrate whisker-reinforced magnesium silicate hydrate composites

Cited by 29 publications

References 40 publications

Evolution mechanism of the low-carbon MgO-based alkali-activated system under different heat-treatment conditions

Evolution mechanism of the low-carbon MgO-based alkali-activated system under different heat-treatment conditions

Understanding the role of seeds in reactive magnesia cement (RMC) formulations

Mechanical properties, thermal stability, and thermal degradation kinetics of silicone rubber/ethylene‐vinyl acetate copolymer/magnesium sulfate whisker composites compatibilized by ethylene‐acrylic acid copolymer

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