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Cold recycling method minimizes the need for aggregates while building roads and has significant economic and environmental benefits. The cold recycled mixture's inadequate mechanical strength, however, is a significant flaw. This article presents the strength increase equation after first analyzing the increasing law of the mechanical strength of the emulsified asphalt cold recycled mixture. The mechanical strength, high-temperature performance and low-temperature performance of emulsified asphalt cold recycled mixture have all been examined after the use of cement and fiber. The reinforcing effect of the fiber is also confirmed through field testing. Studies have shown that after 48 h, the mechanical properties of the emulsified asphalt cold recycled mixture become stable, and the increase is small. The correlation between the proposed strength growth equation and the laboratory test results reaches 0.99. With the addition of 1.5% cement, the high-temperature performance and low-temperature performance of asphalt mixture can be improved by 33% and 18%, respectively. The 0.4% of fiber can improve the high-temperature performance and low-temperature performance of asphalt mixture by 6% and 19%, respectively. Analyze the effect of cement and fiber on the performance of the emulsified asphalt cold recycled mixture, and choose the optimal content of cement and emulsified asphalt to be 1.5% and 0.4%, respectively. [ABSTRACT FROM AUTHOR]

In this work, the mechanical properties of compacted loess specimens formed using the vertical vibration compaction method (VVCM) were investigated, including unconfined compressive strength, CBR value, and shear strength. The top water seepage test and slope simulated rainfall test were implemented. In the test section, the water infiltration laws of compacted loess subgrades with different degrees of compaction were studied. Subsequently, the water stability of compacted loess subgrades was investigated. The results show that the loess specimens formed using the VVCM have adequate mechanical properties. Moreover, increasing the degree of compaction significantly improves the resistance of the loess roadbed to water infiltration and reduces both the water infiltration area and the corresponding water content. In addition, the seepage of the loess roadbed causes the roadbed to collapse, which affects the roadbed's stability. The high-compacted roadbed section exhibits improved resistance to collapse. Thus, improving roadbed compaction can effectively improve the roadbed's stability. [ABSTRACT FROM AUTHOR]