NMR research on cement clinker and its structures in early age hydration

Wang, Xiaojun; Zhu, Wenwen; Wang, Hui

doi:10.1007/s11595-011-0347-5

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…After the silica fume pozzolanic reaction, Q 1 and Q 2 silica tetrahedron maintain a state of equilibrium and coexist in C-S-H. This state is same to the cohesive gel structure in cement shown in [18]. In case of blend cement with silica fume, the Q 1 and Q 2 silica tetrahedron obtained from silica fume pozzolanic reaction can complement strength enhancement composition of C-S-H in blend cement paste.…”

Section: Resultsmentioning

confidence: 56%

29Si NMR Characterization of Silica Tetrahedron in the Silica Fume Simulate Hydration

Wang

Zhu

et al. 2013

KEM

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As the major structure of silica fume, the change of silica tetrahedron in the pozzolanic reaction during the hydration has not been revealed clearly in previous studies. In this study, 29Si solid-state MAS NMR was used to characterize the silica tetrahedron change of the silica fume in saturated alkali solution with 0.9, 1.2, 1.5 and 1.8 four different calcium/silica ratios. The amorphous Q4 silica tetrahedron structure in silica fume changed into Q1 silica tetrahedron at 1 day. Q2 silica tetrahedron formed from Q1 silica tetrahedron within 3 days. Q1 and Q2 silica tetrahedron reached a balance until silica fume completed pozzolanic reaction and the Q4 silica tetrahedron exhausted. The coexistence of Q1 and Q2 silica tetrahedron benefited the physical properties increase of cementitious system. 29Si solid-state MAS NMR results proved that the chain length of silica tetrahedron in C-S-H shortened in the silica fume hydration while the C/S ratio increased.

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Section: Resultsmentioning

confidence: 56%

29Si NMR Characterization of Silica Tetrahedron in the Silica Fume Simulate Hydration

Wang

Zhu

et al. 2013

KEM

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“…o tratamento térmico reprocessa a amostra e efetuase um 2 o tratamento térmico a 1200°C por 1h. Na sequência dos processamentos as amostras foram analisadas por difratometria de raios X (Fig 1.) A análise do difratograma indica a formação da fase Ti2AlC, com parâmetro de rede a= 0,304 nm e c= 1,360 nm, estando em acordo com a literatura 8 . Ao final dos respectivos tratamentos, as amostras são submetidas a ensaios mecânicos de dureza e compressão.…”

Section: Resultsunclassified

Correlação microestrutura-propriedades para os compostos Ti2AlC e Ti3AlC2 sinterizado via micro-ondas

Fujii

Bortolozo

2019

revpibic

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Nesse trabalho tem sido estudado a manufatura dos compostos Ti2AlC e Ti3AlC2 via sinterização por micro-ondas. A microestutura tem sido analisada via difratometria de raios X e microscopia eletrônica de varredura. Os resultados de difratometria indicam a formação predominante da fase Ti2AlC com quantidades minoritárias da fase TiC. As propriedades mecânicas foram caracterizadas por ensaio de dureza e compressão. Os ensaios mecânicos indicam uma dureza média de 3,43 GPa, limite de resistência a compressão de 200 MPa e limite de escoamento de 200 MPa.

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“…Layered-ternary Ti 2 SC ceramic is a compound of the group of MAX phase(where n is 1, 2 or 3, M is an early transition metal, A is an A-group element, and X is either C or N).The crystal structure of this kind of MAX phase can be described as a stacking of near-close-packed transition metal carbide/nitride layers interleaved with layers of pure A-group elements. In the M 2 AX phases, every third layer is an A-group element layer [1].It is the presence of this structure that endows these solids with a unique combination of metallic and ceramic properties, such as relatively soft,easily machinability, high thermal and electrical conductivities, thermal shock resistant, and damage tolerant [2,3]. Studies on Ti 2 SC showed its unusual among MAX family [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

High Pressure Effect on Reaction Synthesis of Ti2SC Powder

Zhu

Mei

et al. 2012

KEM

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Ti2SC has been synthesized using Ti/TiS2/2TiC as initial materials. Combining X-ray diffaraction analysis with thermodynamic calculations, a reaction path is proposed for the intermediate phase TiS and Ti2SC formation. TiS was more possible to be obtained from TiS2 and Ti rather than the decomposition of TiS2. TiC was the main impurity phase in Ti2SC and was difficult to eliminate. The high pressure technology using can help improve the purity of the sample. Scanning electron microscopy (SEM) shows the typically layer structure of the material. Thermogravimetry (TG) and differential scanning calorimetry (DSC) are also to be used to investigate the reaction mechanism，indicating that it would be useful for the formation of more purity sample by adjusting the content of TiS2.

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NMR research on cement clinker and its structures in early age hydration

Cited by 4 publications

References 34 publications

<sup>29</sup>Si NMR Characterization of Silica Tetrahedron in the Silica Fume Simulate Hydration

<sup>29</sup>Si NMR Characterization of Silica Tetrahedron in the Silica Fume Simulate Hydration

Correlação microestrutura-propriedades para os compostos Ti2AlC e Ti3AlC2 sinterizado via micro-ondas

High Pressure Effect on Reaction Synthesis of Ti<sub>2</sub>SC Powder

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