## 5 Conclusions  
The compressive strength and strength characteristics of soil bricks made with economically stabilizer and wood chips were evaluated through unconfined compression tests, where the stabilizer and wood chip contents were varied. In addition, wetting-drying tests, permeability tests, and SB/GB tests were conducted to further assess the properties of the soil bricks. The findings of this study can be summarized as follows:  
Figure 11: Effects of wood chip and stabilizer contents on (**a**) GB factor and (**b**) SB factor.  
Figure 12: Effects of wood chip and stabilizer contents on SB/GB ratio.  
It was found that a minimum stabilizer content of 10% and a curing period of 14 days were required to achieve a target strength of 2.0 MPa for the soil brick. An increase in the mixing ratio of the stabilizer resulted in higher unconfined compressive strength. Additionally, at a curing period of 7 days, the maximum strength achieved was 81% compared to the 28 day strength, indicating excellent early strength.  
The bending strength of the soil brick increased proportionally to the stabilizer content, and the bending strength was found to develop up to 30% of the unconfined compressive strength.  
The wetting-drying test showed that the strength of the soil brick gradually decreased over the initial 3 cycles, sharply decreased (up to 63%) between cycles 3 and 6, and decreased by up to 15% between cycles 6 and 12 (test termination), indicating its vulnerability to weather conditions. However, the strength ratio analysis indicated that the change in strength was not significant compared to conventional cement bricks.  
The dynamic elasticity test revealed that with an increased number of wetting-drying cycles, the relative dynamic modulus of elasticity decreased by up to 45%, while higher stabilizer content resulted in a smaller rate of decrease in the dynamic modulus of elasticity of the soil brick.  
The permeability test showed excellent permeability (1.5-1.9 \(\times\) 10\({}^{-2}\) cm/s) for the soil brick. GB/SB tests revealed higher factors with increased stabilizer content (up to a 2.3-fold increase) and lower rebound resilience with lower stabilizer content and higher wood chip content, indicating better walking comfort. Further field tests are necessary to assess performance under freezing and thawing conditions.  
Conceptualization, I.Y., S.B. and S.O.; Supervision, I.Y. and S.O.; Investigation, S.B.; Data curation, Y.J.; Formal analysis and Writing--original draft, I.Y. and S.B.; Writing--review and editing, Y.J. All authors have read and agreed to the published version of the manuscript.  
This study was supported by the BK21 FOUR (Fostering Outstanding Universities for Research) funded by the Ministry of Education (MOE, Republic of Korea) and the National Research Foundation of Korea (NRF) (No. 5199990214511).  
Not applicable.  
The authors would like to thank the Department of Construction and Disaster Prevention Engineering of Kyungpook National University for their support throughout the research process.  
The authors are unaware of any conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.