Magnesium and calcium silicate hydrates

Lothenbach, Barbara; Nied, Dominik; L’Hôpital, Emilie; Achiedo, G.; Dauzères, Alexandre

doi:10.1016/j.cemconres.2015.06.007

Cited by 205 publications

(134 citation statements)

References 50 publications

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“…12 is that the formulations with the uppermost strength for both ages, 7 and 28 days, present MgO/SiO 2 ratios ranging from 0.8-1.2, in agreement with what was noted in the literature [21,37,38,52]. This difference in Mg/Si content may be associated to a change in M-S-H gel structure [21,29,37], achieving a more resistant structure (Q 3 silica tetrahedra) for MgO/SiO 2 ratios around 0.8-1.2.…”

Section: Semsupporting

confidence: 79%

“…For longer curing times, the TG curves tend to be smoother, indicating a more continuous transition from brucite to M S H in the region between 300 and 550 o C. Also, from the TG curves in which synthetic gels have been used [28,37] it can be deduced that in this range of temperatures (300-550 o C) gel dehydroxylation takes place, suggesting that the OH -ions from Mg(OH) 2 become a part of the poorly-crystallized structure of the magnesium silicate hydrates, potentially associated with defects in the silicate structures in the layered structure. where MgO-SiO 2 systems were analyzed [20], obtaining pH values below 10 at 28 days.…”

Section: Semmentioning

confidence: 99%

“…The 100% MgO hydrated sample shows bands around between 3000-3700, 1600, 1400 and 1040 cm -1 that are also present in the synthetic MgO-SiO 2 sample. For the 100% MgO sample the broadening peak from 3300 to 3600 cm -1 and the peak at 1600 cm -1 are derived from H-bonding of coordinated water [34,37] , hindering the identification of the phases by this technique. Despite all the similarities in the spectra from 1000-4000 cm [29,34].…”

Section: Ft-ir Characterizationmentioning

confidence: 99%

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Optimization of the MgO SiO2 binding system for fiber-cement production with cellulosic reinforcing elements

et al. 2016

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Section: Semsupporting

confidence: 79%

Section: Semmentioning

confidence: 99%

Section: Ft-ir Characterizationmentioning

confidence: 99%

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Optimization of the MgO SiO2 binding system for fiber-cement production with cellulosic reinforcing elements

et al. 2016

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“…But, collagen starts to gather and crosslink at high ionic strength. On the other side, the result suggests that the crosslinking capacity of collagen in MgCl 2 solution is better than that in CaCl 2 solution because the radius of Mg 2+ ( Mg 2+ = 0.66Å) is smaller than that of Ca 2+ ( Ca 2+ = 0.99Å) [31][32][33], and positive charge has higher density and the steric hindrance with smaller ions radius, which can better occupy the coordination sites on collagen molecules.…”

Section: Effects Of Metal Ions On Collagen Self-assemblymentioning

confidence: 78%

Observing Effects of Calcium/Magnesium Ions and pH Value on the Self-Assembly of Extracted Swine Tendon Collagen by Atomic Force Microscopy

Song

Wang

Tao

et al. 2017

Journal of Food Quality

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Self-assembly of extracted collagen from swine trotter tendon under different conditions was firstly observed using atomic force microscopy; then the effects of collagen concentration, pH value, and metal ions to the topography of the collagen assembly were analyzed with the height images and section analysis data. Collagen assembly under 0.1 M, 0.2 M, 0.3 M CaCl 2 , and MgCl 2 solutions in different pH values showed significant differences (P < 0.05) in the topographical properties including height, width, and roughness. With the concentration being increased, the width of collagen decreased significantly (P < 0.05). The width of collagen fibers was first increased significantly (P < 0.05) and then decreased with the increasing of pH. The collagen was assembled with network structure on the mica in solution with Ca 2+ ions. However, it had shown uniformed fibrous structure with Mg 2+ ions on the new cleaved mica sheet. In addition, the width of collagen fibrous was 31∼58 nm in solution with Mg 2+ but 21∼50 nm in Ca 2+solution. The self-assembly collagen displayed various potential abilities to construct fibers or membrane on mica surfaces with Ca 2+ ions and Mg 2+ irons. Besides, the result of collagen self-assembly had shown more relations among solution pH value, metal ions, and collagen molecular concentration, which will provide useful information on the control of collagen self-assembly in tissue engineering and food packaging engineering.

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“…Literature has indicated that the hydration products of MgO-SiO 2 -H 2 O system are primarily composed of Mg(OH) 2 and MSH gel, which is formed by the reaction of MgO and amorphous silica in the presence of sodium hexametaphosphate (Na-HMP) [1][2][3]. The properties of magnesium silicate hydrate cement have also been studied by some scholars [4,5].…”

Section: Introductionmentioning

confidence: 99%

Chloride Ion Penetration Resistance and Pore Structure of Magnesium Silicate Hydrate (M-S-H) Mortars

Zhang¹,

He²,

Wu³

et al. 2018

Proceedings of the 4th Annual International Conference on Material Engineering and Application (ICMEA 2017)

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Abstract-The main purpose of this paper is to study the chloride ion penetration resistance and pore structure of magnesium silicate hydrate cement (MSH) mortars. The chloride ion penetration resistance of MSH mortars with different water-to-cement ratios (0.5, 0.55, 0.6) and different sand rates (25%, 50%, 75%) was studied and compared to ordinary Portland cement (OPC) mortars. The pore structure of magnesium silicate hydrate mortar was tested using mercury intrusion porosimetry (MIP). The results indicate that the chloride ion diffusion coefficient becomes larger with an increase in the water-to-cement ratio and sand rate; the coefficient of MSH mortars is much smaller than that of OPC mortars. The results of MIP show that MSH mortars generally have gel pores measuring less than 10nm; however, the pore size of OPC mortars is dominated by pores measuring 10nm to 100nm. Finally, MSH mortars were found to be less porous than OPC mortars.

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Magnesium and calcium silicate hydrates

Cited by 205 publications

References 50 publications

Optimization of the MgO SiO2 binding system for fiber-cement production with cellulosic reinforcing elements

Optimization of the MgO SiO2 binding system for fiber-cement production with cellulosic reinforcing elements

Observing Effects of Calcium/Magnesium Ions and pH Value on the Self-Assembly of Extracted Swine Tendon Collagen by Atomic Force Microscopy

Chloride Ion Penetration Resistance and Pore Structure of Magnesium Silicate Hydrate (M-S-H) Mortars

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