In this study, the properties of the polymer aqueous solution and the epoxy emulsion were investigated as a way to improve the performance of the red clay binder for application to the rammed earth construction, which is one of the soil construction methods. First, the curing properties, deformation, and microstructure analysis of red clay binders to which the polymer aqueous solution was added were evaluated, and the properties of red clay binders were examined by adding an epoxy emulsion to express the strength at an early
age to be applied to the automated wall forming method. The results of this study are as follows.

1) When the aqueous polymer solution and the epoxy emulsion were added to the red clay binder, the compressive strength of the red clay binder tended to increase. In the case of the polymer aqueous solution, the silica particles and water of the ocher were efficiently hydrogen-bonded by Poly(AA-co-AM), the polymer solids incorporated, and in the case of the epoxy emulsion, the structure of the red clay particles due to the curing mechanism through molecular bonding of epoxy and hardner. It is believed that this is due to the enhancement of the strength of the red clay binder.

2) As a result of observing water loosening by adding a polymer aqueous solution and an epoxy emulsion to the red clay binder, it was found that when the coating agent for water repellency was not applied to the surface of the red clay binder, water resistance was not secured. When applied, it was found that the red clay binder secured water resistance. Therefore, it is considered that countermeasures, such as application of a coating agent for water resistance, will be necessary in the future field application.

3) When the aqueous polymer solution and the epoxy emulsion were added to the red clay binder, the shrinkage deformation of the red clay binder increased as a whole. Particularly, when an epoxy emulsion was added, condensation of the red clay binder at an early age occurred, and it was shown that the shrinkage strain increased with a linear behavior, and it is judged that additional review of the shrinkage cracking method is needed.

4) As a result of examining the microstructure analysis by adding the polymer aqueous solution and the epoxy emulsion to the red clay binder, the plate shape was observed on the surface of the red clay binder compared to the case where the polymer aqueous solution and the epoxy emulsion were not added as a whole. In addition, pores with an average diameter of 104 to 105 nm were formed as a whole. In the case of the polymer aqueous solution, the bonding gap between the molecules for forming the polymer solid is formed as a void, and in the case of the epoxy emulsion, it is thought that the gap between the bound particles occurs due to strong agglomeration at an early age and is formed as a void.