Brick-to-brick Jef Bergmans, jef.bergmans@vito.be Final HISER - - PowerPoint PPT Presentation

Brick-to-brick

Jef Bergmans, jef.bergmans@vito.be Final HISER conference 2018, 16/11/2018, Brussels

• Flemish production: 3,5 Mton masonry products per year
• Mixed aggregates (40-60 m% masonry)

– 4,3 Mton (32m% of the recycled aggregates) – <5 €/ton

• Masonry aggregates (>60 m% masonry)

– 0,3 Mton (3m% of the recycled aggregares) – <3 €/ton

• Goal: 10% replacement of the raw materials in bricks with recycled C&DW

(masonry fraction).  complete replacement of the inert sand fraction: opening substance (‘temper’)

• Other materials (e.g. clay content): not changed

Lab tests

• No quality decrease with gypsum or mortar

contamination

• Gypsum contamination: potential flue gas problem
• Concrete => limestone => pop-outs
• Presence of lime => distribution is crucial

Sampling

• Reference: porphyry sand (Dumoulin)
• Mixture 1: production waste
• Mixture 2: selective demolition

Voettekst invulling

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PRODUCTION PROCESS

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Voettekst invulling

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Voettekst invulling

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Voettekst invulling

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Results

Voettekst invulling 13

16 18 22 5 10 15 20 25 Reference Production waste Demolition waste Compressive strength (in Mpa) 1,81 1,80 1,78 1,0 1,5 2,0 Reference Production waste Demolition waste Density (kg/dm³) 12,6 13,0 13,5 5 10 15 Reference Production waste Demolition waste Water soprtion (24 h, in %)

• Soluble salts:

– Na + K: 0,05% – Mg: 0,01 %

• Freeze/thaw (CEN TS 772-22): no visible

damage

Masonry aggregates = Low-grade mixed aggregates

Conclusions

• 10 V% replaced
• Newly produced bricks meet all the required

standards

• Robustness against the presence of mortar

=> The sand fraction of a selectively demolished masonry fraction can easily be recycled in new bricks