Experimental study and mechanism analysis of functional nanocrystalline cellulose to improve the electromagnetic transmission performance of ordinary Portland cement

Li, Yue; Liu, Jianglin; Jin, Caiyun; Lin, Hui; Shen, Jiale

doi:10.1016/j.cemconcomp.2023.105272

Cited by 6 publications

(3 citation statements)

References 81 publications

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“…The alkalinity is low at approximately 0.1 wt.%, but the concentration locally is up to 2 and 3 wt.% of Na 2 O and K 2 O, respectively. Examples of Portland cement [ 32 , 33 , 34 , 35 ] are also plotted on Figure 7 a,b, and it is obvious that Portland cement has a moderate content of Al 2 O 3, in between that is measured in the cements at Feragen and Leka, and rarely contains MgO and H 2 O. The Low H 2 O content of Portland cement is probably caused by calcination during manufacture.…”

Section: Resultsmentioning

confidence: 98%

“…The samples from Feragen and some from Leka cluster in the center of diagram, while the rest from Leka are widespread, with a high H 2 O content. The composition of Portland cement is taken from [ 32 , 33 , 34 , 35 ]. ( b ) The same samples plotted in a triangular SiO 2 -MgO-H 2 O diagram.…”

Section: Figurementioning

confidence: 99%

“…The Leka samples contain variable amounts of Al 2 O 3 . The data of Portland cement are taken from [ 32 , 33 , 34 , 35 ].…”

Section: Figurementioning

confidence: 99%

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Formation of Natural Magnesium Silica Hydrate (M-S-H) and Magnesium Alumina Silica Hydrate (M-A-S-H) Cement

Austrheim,

Hu,

Ulven

et al. 2024

Materials

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Occurrences of natural magnesium alumina silicate hydrate (M-(A)-S-H) cement are present in Feragen and Leka, in eastern and western Trøndelag Norway, respectively. Both occurrences are in the subarctic climate zone and form in glacial till and moraine material deposited on ultramafic rock during the Weichselian glaciation. Weathering of serpentinized peridotite dissolves brucite and results in an alkaline fluid with a relatively high pH which subsequently reacts with the felsic minerals of the till (quartz, plagioclase, K-feldspar) to form a cement consisting of an amorphous material or a mixture of nanocrystalline Mg-rich phyllosilicates, including illite. The presence of plagioclase in the till results in the enrichment of alumina in the cement, i.e., forms M-A-S-H instead of the M-S-H cement. Dissolution of quartz results in numerous etch pits and negative quartz crystals filled with M-A-S-H cement. Where the quartz dissolution is faster than the cement precipitation, a honeycomb-like texture is formed. Compositionally, the cemented till (tillite) contains more MgO and has a higher loss of ignition than the till, suggesting that the cement is formed by a MgO fluid that previously reacted with the peridotite. The M-(A)-S-H cemented till represents a new type of duricrust, coined magsilcrete. The study of natural Mg cement provides information on peridotites as a Mg source for Mg cement and as a feedstock for CO2 sequestration.

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Section: Resultsmentioning

confidence: 98%