Physical properties of natural hydraulic lime mixed with biodegradable organic
admixture

문기연,최문관,조계홍,조진상,홍창우

The physical properties of natural hydraulic lime were improved through mixing biodegradable organic admixtures with natural hydraulic lime manufactured by using low grade limestone produced in Korea in order to extend the scope of application. The experiment was conducted according to the EU standards. A total of four organic admixtures (potato starch, corn starch, cellulose, and gelatin) were used to investigate the properties depending on the kind of organic admixture and the changes in the properties depending on the amount of mixed organic admixtures. The results of the study showed that the initial compressive strength on 7 days was increased and the setting time was shortened by the mixing of the organic admixtures. Considering the physical properties such as compression strength, setting, air content, and soundness according to the EU standards, the best physical properties were obtained when corn starch, one of the four organic mixtures, was mixed at a mixing ratio of 1.0%.

 Key words: Natural hydraulic lime (NHL), Biodegradable organic admixture, Low-grade limestone, Physical property, Compressive strength.