Furthermore, for a cement content of 10%, the strength is relatively close and increases with a higher cement content. In the case of cylindrical samples, compressive strength decreases as the diameter of the sample increases. For samples of this shape, the differences in values are noticeable regardless of the cement content. Figure 1: Types of specimens tested in [28]. In the article [27], the authors demonstrated that the geometry of the samples (cylinders or prisms) does not affect compressive strength. They recommend producing cylinders instead of prisms because cylinders generally have fewer defects than prisms, which experience stress concentration due to sharp edges. In any case, an aspect ratio of 2 should be chosen for the geometry of the samples. Importantly, the publication concludes that it is possible to obtain representative results for in situ walls by testing cylinders in the laboratory. In the article [11], the authors compared laboratory-molded specimens with cored specimens. The element from which the cored specimens are made is shown in Figure 3. The results of their study are shown in Figure 4. The obtained results indicate that the compressive strength of cored specimens is always lower than that of molded specimens. It is worth noting that the specimens were cured for a typical laboratory period. Although the authors do not specify the exact curing time, they mention that all specimens and panels were tested after a minimum curing time of 28 days. In each series, exactly 10% cement by soil mass was used. Using the proctor compaction test, the optimum moisture content (OMC) was obtained. Figure 3: Coring specimens from the CSRE element. The specimens were cored both vertically and horizontally [11]. Figure 2: Influence of size and shape on CSRE compressive strength at different cement content levels [28]. The amount of cement added to CSRE will impact its mechanical strength and durability, especially in regions with many days per year where temperatures fluctuate around 0 \({}^{\circ}\)C. In the article [23], the results of tests on rammed earth based on the amount of cement used in the mix are presented. According to the authors, although the results indicate that all specimens without cement exhibited a compressive strength above 1.5 MPa, they are highly susceptible to water damage if not properly protected or maintained. Considering the impact of atmospheric conditions, there is significant potential for the use of cement-stabilized rammed earth, which provides adequate strength and durability as opposed to non-stabilized earth, for standard residential houses (one to two stories). The authors' research showed that using a 5% cement addition to soil consisting of 20% clay (<1.7 mm), 60% sand, and 20% gravel results in a compressive strength of 7.783 MPa [23]. Although the production of CSRE is associated with substantial greenhouse gas emissions, these emissions are relatively lower compared to fired bricks and concrete. The obtained compressive strength result is high considering only a 5% cement addition. Additionally, the curing period before testing was interestingly short. The article states that these samples were cured by spraying with water three to four times daily for 1-3 days, and then were fully submerged in water for an additional 3-4 days. This means that the curing time for these specific samples was between 4 and 7 days in total, taking into account both methods of curing. Furthermore, the authors in the text noted that depending on the thickness of the wall, full curing could take several months or more, which suggests a much longer potential curing time for larger structures or full-scale walls [23]. Depending on the climate conditions, the following properties of compacted soil are considered critical for its durability: linear shrinkage, the ratio of wet to dry compressive strength, resistance to water erosion caused by pressurized jets, resistance to cyclic wetting and drying, and frost resistance. All these CSRE properties were tested in [4].