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Dear Jane Short answer is - yes. I have seen samples of paving bricks made here in Senegal out of recycled plastic but dont have any technical information. If you speak French you could contact Monsieur Gueye email : apraoartisans (at) yahoo.fr
There has also been some work in Niger and Mali https://www.plastemart.com/upload/Literature/plastic_bricks.asp https://imaginationforpeople.org/fr/project/paves-en-dechets-plastiques-recycles/ www.dailymotion.com/video/xigdqy (RESEDA project in Niger)
Good luck!