Influence of P(V) on the characteristics of calcium silicates and the hydration of clinkers

DC Nastac, U Kaantee, J Liimatainen, Mikko Hupa, M Muntean

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    The effect of the addition of small amounts of meat and bone meal (MBM) ash on the clinkering process and on the hydraulic reactivity of obtained clinkers was studied. The study was aimed at simulating the clinker burning process in an industrial furnace that replaced up to 20 wt% conventional fuel with MBM used as alternative fuel. Laboratory clinkers were obtained by adding from 0.07 to 0.88 wt.% of MBM ash to an industrial raw mixture, and were compared with a clinker obtained without additions. The free lime content in the clinker increased steadily when the concentration of phosphorus was increased up to a level of 0.16 wt% P2O5 in the raw mixture. With higher phosphorus additions the free lime content increased only insignificantly. The results of X-ray microanalysis indicated that a maximum of 2.3 and 3.3% of the silicon sites were replaced by phosphorus in alite and belite, respectively. The clinker containing 0.6 wt% P2O5 slowed down the hydration process for approximately 1 day and thereafter began to exceed the degree of hydration of the reference sample. The values of degree of hydration of clinker rich in P2O5 exceeded the reference sample at 7 and 28 days by approximately 3 and 5%, respectively.
    Original languageUndefined/Unknown
    Pages (from-to)93–100
    Number of pages8
    JournalAdvances in Cement Research
    Volume19
    Issue number3
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

    Keywords

    • hydration
    • clinkers
    • calcium silicates

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