TY - CONF A1 - Maultzsch, Matthias A1 - Mellmann, Günter A1 - Winkler, Helmut T1 - The substitution of natural aggregates by processed building rubble for high grade concrete T2 - R '99 Recovery, Receycling, Re-integration - 4th Int. Congr. T2 - R '99 Recovery, Receycling, Re-integration - 4th Int. Congr. CY - Geneva, Switzerland DA - 1999-02-03 PY - 1999 AN - OPUS4-6483 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -