Interlayer Mechanical Performance of Cement Stabilized Base and Analysis of Influencing Factors

Abstract

Abstract: In order to study interlayer bonding state of cement stabilized base and the influencing factors of the performance of double-layer continuous paving interlayer, BISAR 3.0 software was used to calculate the mechanical response of pavement structure under the condition that the contact between the interlayer of base was completely continuous, partially continuous and close to smooth. Through direct shear and direct pull-out tests, the effects of water-stabilized mixture gradation, interlayer cement slurry dosage, water-cement ratio and lower base compaction on the mechanical properties of double-layer continuous paving base were explored. The results show that improving the bonding degree between upper and lower base interlayer can significantly improve the fatigue life of upper base, improve the stress state of overall pavement structure, and improve durability and service life of pavement. The interlayer shear strength of coarse gradation is the largest, but the tensile strength decreases slightly. The interlayer strength of upper and lower base can be enhanced by increasing coarse aggregate dosage. When the interlayer cement slurry dosage is 55 g (0.311 g/cm²) and the water-cement ratio is 1.0∶1.5, the interlayer bonding strength of double-layer cement stabilized base is the largest. The shear strength and tensile strength of interlayer increase first and then decrease with the increase of compaction degree of lower base. It is suggested that the compaction degree of lower base should be controlled at 93%~95%, then the paving and rolling of upper base can be carried out.

Key words: cement stabilized base, double-layer continuous paving, mechanical analysis, interlayer bonding state, interlayer performance

CLC Number:

U414

DOU Yingying, XU Xinquan, LI Shanqiang, CHEN Chupeng. Interlayer Mechanical Performance of Cement Stabilized Base and Analysis of Influencing Factors[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 1182-1190.

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