Problematic soils cause significant damage and distress in pavements from moisture induced volume and strength changes. Calcium based stabilization are well known to permanently stabilize expansive soils. Traditional calcium-based stabilizers typically include lime and cement for ground improvement of plastic clays to enhance strength. Calcium Sulfoaluminate (CSA) cement can be an effective and sustainable alternative with improved environmental considerations. The application of CSA cement to treat expansive/weak subgrade soils are limited. This research paper examines the efficiency of CSA cement compared to traditional calcium-based stabilizers in road pavements. The comprehensive laboratory study evaluates the durability of stabilized soils by assessing the mechanical performance under the effect of moisture impacts by means of investigating the bearing capacity, unconfined compressive strength (UCS) during wet-dry cycles, the resilient modulus (M_r) and UCS across practical moisture ranges and mechanical strength from vacuum saturation and moisture susceptibility testing. Results from the study reveals that the calcium-based stabilizers are effective in treating expansive soils by increasing strength across the moisture ranges tested. All stabilized soil specimens showed an increase in UCS after the completion of one wet-dry cycle and resistance to both vacuum saturation and moisture susceptibility testing. While the addition of CSA cement treatment showed considerable improvements over untreated expansive soils, it is not as effective in improving the durability performance of expansive soils compared to traditional cement and lime stabilizers under tested conditions. However, the use of CSA cement has high potential for improving weak subgrade conditions through sustainable ground stabilization.

有问题的土壤会因水分引起的体积和强度变化而对人行道造成重大破坏和困扰。众所周知，钙基稳定剂可以永久稳定膨胀土。传统的钙基稳定剂通常包括石灰和水泥，用于塑料粘土的地面改良以增强强度。出于环境因素的考虑，硫铝酸钙（CSA）水泥可以成为一种有效且可持续的替代品。CSA水泥在处理膨胀/弱路基土壤方面的应用受到限制。本文研究了与传统的钙基稳定剂相比，CSA水泥在路面中的效率。_[R）和UCS（通过真空饱和度和湿气敏感性测试）在实际湿度范围和机械强度范围内。研究结果表明，钙基稳定剂可通过在整个湿度范围内增加强度来有效处理膨胀土壤。在一个干湿循环完成之后，所有稳定的土壤样本均显示UCS升高，并且对真空饱和度和湿气敏感性测试均具有抵抗力。尽管添加CSA水泥处理与未处理的膨胀土相比显示出显着改善，但与传统水泥和石灰稳定剂在测试条件下相比，它在改善膨胀土的耐久性方面并不那么有效。然而，