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Heading: 1.1No-, Down-, Re- andor UP-Cycling in Haiti?
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Today I filed this on the Linkedin "Haitian Development Professionals Group" where there is a lively discussion on Recycling of Debris in Haiti. Following is the introduction to this new Forum dialogue where I need professionals to adress Haiti.

Two days ago I organized a workshop at a privatly, accredited Concrete & Asphalt institute about innovative concrete with 9 nationalities present. That institute does also do damage expertise and handled a case from a collapse of a balcony where 2 people got killed, in Maastricht.

Would we not have any funds to investigate INDEPENDENTLY AND CREDIBLE the cause of the disaster in Haiti where 200.000 people got killed?
What kind of a world are we living that 2 lives lost in the Netherlands is more important then 200.000 lives in Haiti? Where is the money and the moral?

We are here in the Haitian DEVELOPMENT PROFESSIONAL group so we have to investigate ALL the causes for the disaster with such a professional ethic that those lives, as with soldiers killed in a just war, are not lost in vain.

The subject of the rest value of the aggregate we should discuss on www.aggregateresearch.com. But NO-Cycling by landfill when there is no land for decent housing is a crime that rewards the non professionals anti CSR & anti Sustainability forces that would like to import aggregate and cement again, in vain. They where responsable to safeguard the abuse of concrete in the first place!

See concrete construction professionals FOR the DEVELOPMENT of the Haitian PROFESSIONALS at www.aggregateresearch.com so not to bore the others with recycling "details".

I would like to know your opinion what should be done. As someone suggested, could poor aggregate be part of the problem?



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Boudewijn Piscaer


Do no expect any miracles from recycling concrete to be reused into concrete. If you have poor aggregates to start with, no end of processing will make them better.

However, there are major differences in processes and equipment that have a major impact on the performance of the recycled concrete back into concrete.

Recycling concrete follows the same rules as processing aggregates to an extent. Particle shapes, gradings etc are all characteristics of the product from processing concrete that will influence the plastic and hardened properties of the concrete.

On the subject of Haiti, if what we see in the media is correct, the design of the infrastructure and the quality of the concrete were both poor.

That may be a good thing for the recycling activities that will take place in Haiti, as, the poorer the quality of concrete that you process to put back into concrete, typically the better the quality of aggregates and sands will be from the recycling process. The poorer quality will no doubt have come about from a poor quality cement paste - that fact will make liberating the sands and aggregates a lot simpler, resulting in a higher yield of aggregates and sands for making quality concrete.

Of course, traditional crushing and screening do not give you good quality recycled aggregates for concrete, and the end products from this type of processing will deliver inferior quality, which will be very apparent in the new concrete manufactured.

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BARRY HUDSON
 
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