It should be noted that the research, described in this Betoniek, is on recycling of "modern concrete" from after 2000. In contrast to the concrete described in Betoniek March 1983 (in Dutch) nowadays the cement used is much finer ground. Today's cement is more like the cement "pc-B" in Betoniek 1983, fig 4. For this reason the harvested, non-hydrated cement is lower. Fortunately, most
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