The results (Table 1) showed that rammed earth in warm climates needs 6% cement, while in cold climates (due to frost resistance), it requires at least 9% cement. Moreover, not all mixtures (based on grain size) with such cement additions fulfill the durability requirements. As proven in the article, the grain size distribution is a crucial factor for CSRE durability, even though it is not commonly emphasized in other publications. Figure 4: Average compressive strength of molded or cored specimen series. Numbers \((150,100,80)\) indicate the specimen’s diameter in millimeters (mm). Slender 1 indicates samples with slenderness ratio equal to 1 [11]. According to another review of earthen building materials, the most commonly used solution is stabilization with the addition of Portland cement, typically comprising 4-8% by mass [34]. It should be noted that cement stabilization not only negates the reduced carbon footprint and embodied energy of earthen materials but also affects the recyclability of the material after its service life. Additionally, cement stabilization adversely impacts the hygric properties as well [34]. Two primary metrics that can assist in assessing the environmental friendliness of a construction method are CO2 emissions and embedded energy. Both of these parameters significantly increase for stabilized rammed earth (SRE) compared to non-stabilized rammed earth (URE), as illustrated in Table 2 prepared by [PERSON] et al. in [Characterization of the mechanical and physical properties of stabilized rammed earth: A review]. In fact, the embodied energy of CSRE walls increases linearly with the cement content [embodied energy in cement-stabilized rammed earth walls]. For instance, a wall with 8% cement in stabilized rammed earth (SRE) results in more than 14 times the CO2 emissions and 10 times the embodied energy compared to an equivalent wall constructed with non-stabilized rammed earth [35]. Due to energy-intensive manufacturing processes, cement production is one of the largest sources of global greenhouse gas emissions. The cement industry alone is responsible for over 6% of global warming and anthropogenic greenhouse gas emissions [40]. Therefore, there is a growing interest in more ecological alternatives beyond just cement and lime stabilization. This perspective has led to the emergence of geopolymers as a viable alternative to cement [41]. Compressive strength tests on CSRE were conducted on cubic specimens from various mixtures and after different maturation periods. The intent of the study was to determine the maturation time after which the increase in compressive strength becomes less pronounced. Subsequently, from the prepared CSRE wall panels, specimens were cored after \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Additives**} & \multicolumn{2}{c}{**CO2**} & \multirow{2}{*}{**Reference**} & \multicolumn{2}{c}{**Embedodied**} & \multirow{2}{*}{**Reference**} \\  & **Emissions** [kg] & & & & **Energy [MJ]** & \\ \hline None & 3–9 & [36; 37] & 49 & [9] \\
2.5\% cement & 42 & [36] & – & – \\
4\% cement & – & – & 280 & [38] \\
5\% cement & 86 & [36] & – & – \\
6\% cement & – & – & 400 & [38] \\
7.5–8\% cement & 131 & [36; 39] & 500 & [38] \\
10\% cement & 179 & [36] & 630 & [38] \\
12\% cement & – & – & 750 & [38] \\ \hline \hline \end{tabular}
\end{table} 
Table 2: CO2 emissions and embodied energy per cubic meter of RE [35].