The lack of global standardization in the testing methods for Stabilized Rammed Earth (SRE) hinders progress in advancing knowledge of this sustainable construction technique. This review compiles research from the last four years on SRE, focusing on manufacturing parameters, curing conditions, chemical stabilizer kinds, stabilizer dosage, testing methods, and mechanical and durability properties. Based on this analysis, a methodology is proposed to define and standardize SRE manufacturing parameters, curing, and testing conditions. The proposed methodology suggests that soil particle size distribution should be optimized to enhance mechanical strength and durability while reducing stabilizer dosage. The selection and dosage of stabilizers should be determined based on soil characteristics and environmental considerations. The standard proctor test is recommended for assessing manufacturing conditions, while curing should be performed by wrapping samples in plastic at laboratory temperature. Unconfined Compressive Strength is identified as the most relevant mechanical test and should be conducted at 7, 28, and 90 days. For durability assessment, erosion testing and exposure to liquid water are recommended at 28 days. This methodology represents one of the first steps toward the standardization of SRE testing methods, which must be accepted and adopted by researchers and practitioners. By implementing this methodology, comparable results across studies could be achieved, facilitating further research and collaboration among researchers. Such efforts would contribute to enhancing the available knowledge to improve the material's performance and further promote SRE as a sustainable construction technique.
Alternative building materials, such as adobe and rammed earth, can help reduce construction costs and carbon-dioxide emissions, making them an important part of sustainable building practices. Rammed earth building walls are substantial, long-lasting, heat-resistant, and recyclable because they are constructed by compressing naturally damp soil between temporary forms. Using mud in contemporary buildings presents several challenges, including durability and strength. This study investigated the impact of incorporating regular portland cement, quicklime (calcium oxide), and a self-polymerizable acrylic-based resin (a transparent bonding agent) into a soil mixture to address these problems. The optimal moisture content that maximizes compressive strength was also investigated. The results demonstrated that the optimum moisture content for maximum compressive strength and dry density was identical as the soil content in a mixture increased. The increase in the compressive strength and reduction in cracking can be attributed to the optimal proportions of regular portland cement, self-polymerizable acrylic-based resin, and quicklime. This study can serve as a guide for mixing appropriate proportions of materials that would yield the optimum mechanical properties for rammed earth construction in hot arid regions.