A state-of-the-art review of rubber modified cement-based materials: Cement stabilized base

To further improve the durability of pavement structure and promote the research and application of rubber cement stabilized base, the research results of rubber modified cement-based materials and their cement stabilized base were systematically combed. The action principles of different rubber surface treatment technologies were revealed, and based on the principle of similar adhesion characteristics between rubber and cement-based materials, the treatment technology type and the optimal concentration of treatment agent suitable for rubber cement stabilized base were determined. The key sieve pass rate of mineral material gradation was recommended, and the best preparation process for rubber cement stabilized base was determined. The mechanical and fatigue properties of cement stabilized base with different rubber particle size and content were evaluated, the bonding and anti-cracking mechanism of the rubber cement stabilized base was explored. Results indicate that considering the treatment effect and cost, NaOH solution with concentration of 5% is recommended as rubber surface treatment agent. The discontinuous gradation with the aggregate nominal maximum particle size of 26.5 mm is the common gradation of rubber cement stabilized base. It is recommended that the passing rate of 4.75 mm, 2.36 mm and 0.075 mm sieve holes be controlled at 32–43%, 22–28% and 1.5–3.6% to ensure compactness. Compared with heavy compaction method, vibration compaction method not only has less aggregate damage, but also beneficial to reduce the dry shrinkage deformation of the rubber cement stabilized base. Compared with rubber powder (<0.6 mm), the 90 d compressive resilience modulus of the rubber particle(≥0.6 mm)cement stabilized base can be reduced by 25.16%, which has a more significant improvement in toughness. With the increase of rubber content, the mechanical properties of rubber cement stabilized base decreases gradually, the fatigue resistance and deformation ability are significantly enhanced, and it has good durability. This research results can provide scientific basis and theoretical support for rubber cement stabilization base engineering application and quality control.