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University of Maribor Slovenia

SB08 World Sustainable Building Conference. L . Hanžič , A. Mautinger, B. Jurič, L.A. Pereira de Olivera. Water retention capability of mortars made of recycled aggregate www.fg.uni-mb.si/lucija/presentations/2008melbourne.ppt. Melbourne, 21 – 25 September 2008.

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University of Maribor Slovenia

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  1. SB08 World Sustainable Building Conference L. Hanžič, A. Mautinger, B. Jurič, L.A. Pereira de Olivera Water retention capability of mortars made of recycled aggregate www.fg.uni-mb.si/lucija/presentations/2008melbourne.ppt Melbourne, 21 – 25 September 2008 University of Beira Interior Portugal University of Maribor Slovenia

  2. SB08 – World Sustainable Building Conference Melbourne, September 2008 Demolition Demolition waste Recycling Virgin aggregate Cement matrix Demolition site Collection station Mobile plant Stationary plant Virgin aggregate with adhered cement matrix 2/6 University of Maribor, Slovenia & University of Beira Interior, Portugal Introduction Study aim Test the applicability of RA in mortar. Recycled aggregate – RA Assessment 1. Workability (flow, segregation, bleeding), 2. Ability to retain mix water. Hypothesis Due to high porosity RA absorbs large quantity of mix water which might be released back to the matrix when desiccation occurs during hydration. 1. Reduction of flow, 2. Lowerloss of mix water. FINE AGGREGATE COARSE AGGREGATE ? Concrete

  3. SB08 – World Sustainable Building Conference Melbourne, September 2008 Mixture compositions Aggregate Grading curve Binders CEM I 42.5 R Water fOF (%) Tap MORTAR 25 30 35 Admixtures None wb (g/g) Aggregate 12 mixtures NA 0.7 0.8 RA BINDER PASTE 3/6 University of Maribor, Slovenia & University of Beira Interior, Portugal Materials Natural Aggregate (NA) Recycled Aggregate (RA) Volume fraction of Binder Paste Volume fraction of Over Fill ρ – Density ψ – Compacted bulk density Volume fraction of Voids

  4. SB08 – World Sustainable Building Conference Melbourne, September 2008 Method Flow table Spread Results 4/6 University of Maribor, Slovenia & University of Beira Interior, Portugal Experiments and results - Workability Flow table spread measured after 10, 15 and 20 jolts d1 d2 Visual inspection segregation and bleeding d (RA) < d (NA) Bleeding • Difference in flow decreases • with increase of wc and • increase of fOF.

  5. SB08 – World Sustainable Building Conference Melbourne, September 2008 Method Gravimetric method Results 5/6 University of Maribor, Slovenia & University of Beira Interior, Portugal Experiments and results – Water retention capability Relative water loss Mass of water built into the frame uw (RA) < uw (NA) I. II. III. I. region Loss of water from bottom mortar layer II. region Water transport from iner parts of mortar layer III. region Hydration and reducton of free water.

  6. SB08 – World Sustainable Building Conference Melbourne, September 2008 6/6 University of Maribor, Slovenia & University of Beira Interior, Portugal Conclusion RA has apositive effect on the mortar capability to retain mix water when placed in the contact with absorptive material. However RA mortars are stiffer and require synchronized increase of wc and fOF in order to achieve proper workability.

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