Enhancing Asphalt Performance and Its Long-Term Sustainability with Nano Calcium Carbonate and Nano Hydrated Lime

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Enhancing Asphalt Performance and Its Long-Term Sustainability with Nano Calcium Carbonate and Nano Hydrated Lime


The performance of AC mixtures modified with Nano CaCO3 and NHL in terms of permanent deformation is illustrated in Figure 14 and Figure 15, respectively. A comparison of permanent strain against loading cycles for various nanomaterial (NM) contents shows that permanent deformation decreases with the increasing content of both Nano CaCO3 and NHL. For a clear numerical comparison, power fitting on a logarithmic scale delineates the data with straight lines characterized by an intercept (a), indicating the initial permanent strain, and a slope (b), representing the rate of strain accumulation through successive load applications. The parameters ‘a’ and ‘b’, along with the permanent strain (εp) at the 1000th load cycle, measure the mixture’s resistance to permanent deformation; lower values indicate enhanced rutting resistance. All parameters are exhibited in Table 5. The analyzed data reveal that both Nano CaCO3 and NHL contribute to a decrease in permanent deformation parameters. For Nano CaCO3, the intercept ‘a’ drops from 198 at 0% NM to 110 at 10% NM content, and the slope ‘b’ from 0.3916 to 0.331, reflecting a decrease in the strain accumulation rate. Similarly, NHL shows a reduction in intercept from 198 to 125 and in slope from 0.3622 to 0.3001 over the same NM range. At 6% NM, NHL shows an improvement rate in (εp) of 50.24%, indicating a significant increase in rutting resistance. This improvement is more pronounced at 10% NM, where NHL achieves an (εp) improvement rate of 68.64%. On the other hand, Nano CaCO3’s improvement rates are 31.8% at 6% NM and 61.8% at 10% NM. These findings highlight that the added NHL to AC mixtures not only reduces the rate of permanent deformation but also improves the mix’s overall structural stability more effectively than Nano CaCO3. The results underscore NHL’s potential as a superior modifier for enhancing the durability of pavement structures.

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And in case you missed it, here is our ultimate road trip playlist is the perfect mix of podcasts, and hidden gems that will keep you energized for the entire journey

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