caa a22 4500 467948313 CHVBK 20180322200725.0 cr unu---uuuuu 170328e19861101xx s 000 0 eng 10.1007/BF02431650 doi (NATIONALLICENCE)springer-10.1007/BF02431650 (NATIONALLICENCE)springer-10.1007/BF00553467 Microstructural analysis of hardened alite paste [Elektronische Daten] Part 1 Porosity [H. Jennings, L. Parrott] New information about the pore structure of hydrating alite (impure tricalcium silicate) of 0.59 water∶alite ratio has been obtained by examining polished cross-sectional surfaces with a scanning electron microscope. Micrographs were used to analyse quantitatively the volume of porosity which was impregnated with epoxy and these results were compared with independent measurements of porosity using volumetric technqiues. The results suggest that pores less than 50 nm diameter are not impregnated by epoxy and that they may be incorporated as part of the pore structure of the calcium silicate hydrate; however, only the finest of these pores may remain in pastes formed at low water ∶ solid ratios. The calcium silicate hydrate formed in the late stages of hydration may not incorporate as much fine porosity as that formed during the early stages. The structure of the large "capillary pores” (i.e., pores greater than 50 nm diameter) changes with time from an open network to an array of disconnected pores. This study reveals that mature specimens are very heterogeneous and contain regions, hundreds of micrometres across, having few, if any, capillary pores. These regions are not found in young specimens. Chapman and Hall Ltd., 1986 Jennings H. Center for Building Technology, National Bureau of Standards, 20899, Gaithersburg, Maryland, USA aut Parrott L. Materials Division, Cement and Concrete Association, Wexham Springs, UK aut Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 4048-4052 0022-2461 21:11<4048 1986 21 10853 https://doi.org/10.1007/BF02431650 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02431650 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jennings H. Center for Building Technology, National Bureau of Standards, 20899, Gaithersburg, Maryland, USA aut NATIONALLICENCE 700 1- Parrott L. Materials Division, Cement and Concrete Association, Wexham Springs, UK aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 4048-4052 0022-2461 21:11<4048 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553467 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer