Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Revisiting Tennis-Jennings method to quantify low-density/high-density calcium silicate hydrates in Portland cement pastes
Abstract The Tennis-Jennings quantification method was revisited for characterizing low-density (LD) and high-density (HD) calcium silicate hydrates (C-S-H). Parameterized Portland cement pastes were prepared with different Blaine values of ordinary Portland cement and different types of cement using two water-to-cement (W/C) ratios (0.40 and 0.55). The hydration processes in these samples were examined using nitrogen sorption measurements and X-ray diffraction (Rietveld) analyses. The densities of LD and HD C-S-H were determined to be 1.19 and 1.79 (g/cm3 of dried C-S-H), respectively. Variation of the mass ratio of the LD C-S-H to the total C-S-H with hydration depended on the fineness of the original cement powder within the same Portland cement and the type of cement, especially at the later hydration for higher W/C ratios. For cement pastes with lower W/C ratios, the type of cement did not have a significant effect on the LD C-S-H precipitation at later hydration.
Highlights Classification into low-density (LD)/high-density (HD) C-S-H was revaluated. The Blaine values of OPC affected the mass ratio of LD C-S-H to total mass of C-S-H. Types of cement affected the amount of LD C-S-H at higher water-to-cement ratio.
Revisiting Tennis-Jennings method to quantify low-density/high-density calcium silicate hydrates in Portland cement pastes
Abstract The Tennis-Jennings quantification method was revisited for characterizing low-density (LD) and high-density (HD) calcium silicate hydrates (C-S-H). Parameterized Portland cement pastes were prepared with different Blaine values of ordinary Portland cement and different types of cement using two water-to-cement (W/C) ratios (0.40 and 0.55). The hydration processes in these samples were examined using nitrogen sorption measurements and X-ray diffraction (Rietveld) analyses. The densities of LD and HD C-S-H were determined to be 1.19 and 1.79 (g/cm3 of dried C-S-H), respectively. Variation of the mass ratio of the LD C-S-H to the total C-S-H with hydration depended on the fineness of the original cement powder within the same Portland cement and the type of cement, especially at the later hydration for higher W/C ratios. For cement pastes with lower W/C ratios, the type of cement did not have a significant effect on the LD C-S-H precipitation at later hydration.
Highlights Classification into low-density (LD)/high-density (HD) C-S-H was revaluated. The Blaine values of OPC affected the mass ratio of LD C-S-H to total mass of C-S-H. Types of cement affected the amount of LD C-S-H at higher water-to-cement ratio.
Revisiting Tennis-Jennings method to quantify low-density/high-density calcium silicate hydrates in Portland cement pastes
Kurihara, Ryo (Autor:in) / Maruyama, Ippei (Autor:in)
22.03.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Alkali binding in cement pastes - Studies on calcium silicate hydrates, 2
| British Library Online Contents | 1999