## 4 Results and Discussion
### Discussion
#### 4.2.1 Laboratory Test Samples of Lengthsui Auxiliary CSGRD
As the curing period increases, the strength of the correlation does as well, reaching a moderate level by the 180-day mark. However, the overall statistical insignificance suggests that paste margin alone may not be a strong determinant of compressive strength, and other factors such as aggregate quality, sand ratio, fine content, water-cement ratio, curing condition, and age are likely to play a more critical role in influencing the CSGR performance over time [14; 15; 16; 17]. The Pearson correlation coefficients and corresponding \(p\)-values for the paste margin and compressive strength across various test ages (7, 28, 90, and 180 days) show that the relationship between paste margin and compressive strength was generally weak. Figure 4: Relationship between paste and mortar margins and compressive strength development. 1. Insight into Paste Margin vs. Compressive Strength Development The data in Table 22 provide insights into the relationship between paste margin and compressive strength at different curing ages: 7 days, 28 days, 90 days, and 180 days. The details are provided as follows: * A 7-Day Test Age: The Pearson correlation coefficient is 0.172 with a \(p\)-value of 0.467. This suggests a very weak positive correlation between paste margin and compressive strength, which is not statistically significant. * A 28-Day Test Age: The correlation slightly improves to 0.197 with a \(p\)-value of 0.404. Although the relationship strengthens slightly, it remains weak and statistically insignificant. * A 90-Day Test Age: The coefficient increases to 0.221 with a \(p\)-value of 0.443, indicating a continued weak relationship, still not statistically significant. * A 180-Day Test Age: The correlation coefficient jumps to 0.418 with a \(p\)-value of 0.184. While this shows a moderate positive correlation, the relationship is still not strong enough to be deemed statistically significant. 2. Remarks on Paste Margin and Compressive Strength Development The paste data suggest that the relationship between paste margin and compressive strength becomes moderately positive as the curing time increases [17]. However, none of the correlations are statistically significant, implying that the paste margin alone does not have a strong predictive power for compressive strength [14]. 3. Overview: Mortar Margin vs. Compressive Strength Development In contrast, the relationship between mortar margin and compressive strength fluctuated between weak negative and weak positive correlations across the curing periods, as indicated in Table 22. The Pearson coefficients were \(-0.269\), \(-0.216\), \(-0.003\), and 0.204 for the 7-day, 28-day, 90-day, and 180-day compressive strengths, respectively. These results suggest that there is a slight inverse relationship between mortar margin and compressive strength at early stages, with higher mortar margins possibly leading to lower strength. However, by 180 days, this relationship becomes weakly positive, though still statistically insignificant based on the t-statistics (\(-1.185\), \(-0.936\), \(-0.011\), and 0.624). The lack of a strong, consistent relationship between mortar margin and compressive strength suggests that the mortar margin may not be the only critical factor in determining the compressive strength of CSGR, particularly as the material or prepared samples mature [14]. 1. Insight into Mortar Margin vs. Compressive Strength Development For the mortar margin in Table 22, the Pearson correlation coefficients and \(p\)-values indicate a fluctuating relationship with compressive strength, ranging from weak negative to weak positive correlations across the various test ages. The details are provided as follows: * A 7-Day Test Age: The Pearson correlation coefficient is \(-0.269\) with a \(p\)-value of 0.251. This suggests a weak negative correlation, which is not statistically significant. * A 28-Day Test Age: The correlation improves slightly to \(-0.216\) with a \(p\)-value of 0.362, but it remains weak and statistically insignificant.