Mix proportion design and production optimization of stone filled with cement stabilized macadam considering shrinkage resistance and easy construction.

The main objective of this paper is to design a stone filled with cement stabilized macadam (SFCSM) considering shrinkage resistance and easy construction. The corresponding mix proportion design method for SFCSM was proposed. The skeletal coarse aggregates in SFCSM adopt the particle size frequently applied in engineering practice to facilitate construction. In the mix proportion design, the compressive strength test and compaction test were employed to progressively ascertain the optimal blend ratio of coarse aggregates, cement binder, and cement mortar. The vibratory mixing technology (VMT) was introduced to optimize the production of SFCSM. Further, the strength, modulus and shrinkage properties of SFCSM were also evaluated and validated in comparison with the common CSM. The results of the study illustrate that the skeletal coarse aggregates generate the skeletal structure and the role of the filling fine aggregates enhances the stability of the skeletal structure, thus improving the integrity of the mixer. The bonding effect and hydration level of cement in SFCSM is lower than that of the common CSM. The compressive and tensile strength of SFCSM is lower than that of the common CSM. However, the SFCSM has better resistance to dry shrinkage than CSM. The SFCSM as the base is located between the flexible base and the semi-rigid base in the pavement structure design. In addition, the VMT can improve the mixing uniformity of SFCSM and increase its strength. In summary, this study provides inspiration for the shrinkage resistance and practical engineering application of SFCSM. • The mix design method of SFCSM was proposed considering shrinkage resistance and easy construction. • The vibratory mixing technology (VMT) was introduced to optimize the production of SFCSM. • The material properties of SFCSM were evaluated and validated in comparison with ordinary CSM. • The SFCSM has high compressive strength, excellent shrinkage resistance and easy construction. [ABSTRACT FROM AUTHOR]