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Ground oyster shells have successfully replaced sand in building mortar in trials in France
17 February 2021
Around 65 tonnes of oyster shells were used for the 65m3 of mortar during the testBy Connexion journalist
The ground oyster shell mixture will now be monitored to see if it could provide a long-term solution.
The first test was for filling quarry holes which cause road subsidence, but laboratory tests are under way to see whether oyster shell “sand” could also be used for housebuilding.
Officials in Gironde, where a number of roads are built over former quarry mines which need to be filled with mortar to prevent subsidence, decided to use oyster shells rather than sand for ecological reasons.