THE INFLUENCE OF CaO AND P2O5 OF BONE ASH UPON THE REACTIVITY AND THE BURNABILITY OF CEMENT RAW MIXTURES

The influence of CaO and P2O5 upon the reactivity of cement raw meal was investigated in this paper. Ash of bone meal containing Ca3(PO4)2 - 3CaO·P2O5 was used as the source of P2O5. Two series of samples with different content of the ash of bone meal were prepared. In the first series, the ash of bone was added into cement raw meal. The second series of samples were prepared by considering ash as one of CaO sources. Therefore, the total content of CaO in cement raw meal was kept constant, while the amount of P2O5 increased. These different series of samples were investigated by analyzing free lime content in the clinkers. The XRD analysis and Electron Micro Probe Analyzer analysis of the clinkers were also carried out. Two parameters were used to characterize the reactivity of cement raw meal: content of free lime and Burnability Index (BI) calculated from free lime content in both series of samples burnt at 1350 ºC, 1400 ºC, 1450 ºC and 1500 ºC. According to the first parameter, P2O5 content that drastically makes worse the reactivity of cement raw meal was found at 1.11 wt.% in the first series, while this limit has reached 1.52 wt.% in the second one. According to the BI, the limit of P2O5 was found at 1.42 wt. % in the first series and 1, 61 wt.% in the second one. Furthermore, EPMA has demonstrated the presence of P2O5 in both calcium silicate phases forming thus solid solutions

Greening the Danes? Experience with consumption and environment policies

Consumer-oriented environmental policies came high on the political agenda during the 1990s. Internationally, consumers were assigned a key role in environmental policies; also in Denmark, political initiatives were taken to promote sustainable consumer behaviour. In this article, the results of Danish policies related to consumption and environment are assessed by considering first, the environmental impacts of the political measures, and second, whether the policies have succeeded in addressing the dynamics behind increasing consumption. The study combines a theoretical understanding of consumption as an inseparable part of daily practices with empirical analyses of three fields of consumption: housing, transportation, and information and communication technology. It is pointed out that policies to promote sustainable consumption are successful only when technological development, economic structures, and information are all in accordance with each other, and this is the case only when sustainable consumption does not conflict with economic growth. A more fundamental critique thus concerns the failure of Danish consumer-oriented environmental policies to address consumption growth and the rising standards for “normal consumption.” Copyright Springer Science+Business Media, LLC 2007Consumer-oriented environmental policy, Sustainable consumption, Housing, Transport, Information and communication technology, Denmark,