Abstract: In order to study the influencing factors of the deformation of the water-stable base, a systematic experimental study was carried out on the cement content, variety, and gradation design. The dry shrinkage test and temperature shrinkage test were conducted through skeleton dense cement stabilized crushed stone, suspended dense cement stabilized crushed stone, and skeleton void cement stabilized crushed stone. Using the Origin to perform regression fitting on the test data, the deformation law of the semi-rigid base material was obtained, thereby improving the durability of the asphalt pavement. The results showed that:1) The dry shrinkage coefficient of the skeleton void structure increased by two times in 0-7 days, and the increase of the dry shrinkage coefficient was moderated. The dry shrinkage degree of the skeleton void structure was the lowest at the same cement content, that is, the skeleton void structure cement could effectively reduce the cracking of the water-stabilized base. 2) In cement stabilized gravel, the temperature shrinkage deformation of each temperature section increased gradually with the increase of the cement content, the temperature shrinkage deformation was the largest in the high temperature zone at 50-60℃, and the deformation became smaller as the temperature decreased; In the range of 0-10℃, the temperature shrinkage deformation of the section was the smallest, so the cement stabilized crushed stone is more suitable for the low temperature area in the north. 3) For the same cement content and cement grade, the average temperature shrinkage coefficient of the skeleton void is the smallest, the suspended dense type is the largest, and the skeleton dense type is in the middle. Therefore, the skeleton void structure cement can effectively reduce the cracking of the water-stable base. Through a large number of experimental studies, the skeletal void structure has the best temperature shrinkage resistance, cement 42.5 has better dry shrinkage resistance, and cement 32.5 has better temperature shrinkage resistance.

Key words: semi-arid, dry shrinkage test, temperature shrinkage test, semi-rigid base