Study On The Properties Of Cement Mortar With Modified Oyster Shell Powder

Summary

Modified oyster shell powder obtained by treating NaOH solution consists of 98.7 wt% of calcite and 1.3 wt% of chitosan.  Degree of deacetylation of chitosan obtained from  modified oyster shell powder is 79.4%.  In comparison with original oyster shell powder, modified oyster shell powder has a finer particle size, greater specific surface area and  lower density.  The shape of powder before and after modification changed from smooth-surfaced, angular particle form to round-like particle form with eroded corner and porous surface.  The compressive strength of cement mortar is increased with increasing amount of modified oyster shell  powder.  Modified oyster shell powder has a strong antibacterial effect, 99.8-99.8% but oyster shell powder does not have antibacterial effect to Escherichia coli and Staphylococcus aureus.  15 refs.

Primary author(s): Lee S-H; Kim H-J; Jung Y-C; Bae S-K

                            Kunsan,National University

Source: J.Korean Ceram.Soc.

            38,No.3,2001,p.231-237

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