Cyprus 16th Concrete Conference 2009

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  • Γιατί ασβεστολιθικά αδρανή;Αριθμός λατομείωνΠοιοί είναι οι στόχοι μας
  • Σε τι θα αναφερθώ. Διαίρεση ομιλίας.
  • Cyprus 16th Concrete Conference 2009

    1. 1. Crushed limestone aggregates for concrete and mortars: Tests according to ΕΝ 12620, EN 13043, EN 13242 και EN 13139 standards.<br />Dimitris Xirouchakis, GeoTerra Ltd – Geomechanics & Quality Control Laboratory<br />Alexis Theodoropoulos, Α. Theodoropoulos – P. Moskofogoglou Pty. – Q4U Consulting Engineers<br />
    2. 2. Limestone Aggregates<br /><ul><li>Chemistry / Mineralogy
    3. 3. Physical & Mechanical Characteristics
    4. 4. Observations - Correlations</li></li></ul><li>Chemistry / Mineralogy<br />96,1% CaCO3 (90,8 – 99,0 %)<br />0,66% MgO (0,15 – 2,66 %)<br />1,22% SiO2 (0,22 – 6,03 %)<br />0,08% Al2O3 (0,02 – 0,19 %)<br />0,07% Fe2O3 (0,01 – 0,28 %)<br />0,05% Na2Oeq (0,03 – 0,06 %)<br />XRD: 95,7 – 99,5%Cc<br /> 0,8 – 3,3%Dol <br /> &lt;1% Qz, Fe-oxides<br />Average apparent density:<br /> (2,66 ± 0,01g/cm3)<br />CaCO3 (2,71 g/cm3)<br />CaMg(CO3)2 (2,85 g/cm3)<br />CaFe(CO3)2 (3,20 g/cm3)<br />
    5. 5. Heavy metals<br /># Turekian & Wedepohl 1961. * Industrial sites, Germany, EUR 22805 EN 2007 JRC Ispra<br />
    6. 6. Alkali – silica reaction: Innocuous aggregates<br />
    7. 7. Sand<br />
    8. 8. Fine gravel<br />
    9. 9. Coarse gravel<br />
    10. 10. MB vs SE<br />
    11. 11. FI vs SI<br />Basaltic aggregates: <br />Pétursson 2000<br />
    12. 12. LA vs MDE<br />
    13. 13. VLAvs MS<br />
    14. 14. Conclusions<br />Aggregates derive from poor (85,0 – 93,5%CaCO3) to high quality (&gt;98,5%CaCO3)limestones<br />They consist of 95,7 – 99,5%calcite, 0,8 – 3,3%dolomite &lt;1% quartz, Fe oxides.<br />Heavy metals concentration is typical for limestone and at non-toxic levels<br />Alkali-silica reaction: Innocuous materials<br />Statistically significant correlations (&gt;|0,5|) are observed among MB – SE, FI – SI, LA - MDE, VLA – MS. No correlation is observed between MDE and WA24, and SiO2 content and MDE reported in igneous aggregates.<br />

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