Abstract
Cement stabilized macadam base is widely used as a road building material in various grades of highways. Based on the law that the base cracking is mainly affected by the shrinkage of cement stabilization materials, this paper introduces the method of adding micro-expanding cement to the base that can effectively reduce the hydration shrinkage coefficient and dryness shrink factor. At the same time, it is pointed out that strict control of the amount of micro-expansion cement and the quality of the construction can also effectively reduce the occurrence of cracks in the base.
Highlights
Micro expansion cement has the characteristics of better early strength and micro expansion
This kind of cement can expand by the action of expansive agent during hydration, which makes up for the shrinkage of cement stabilized macadam, reduces the cracking of base course and improves the performance of pavement base course
Micro expansion cement is a kind of cement with micro expansion characteristics by adding expansion agent
Summary
The strength grade of cement used for cement stabilized macadam base shall not be less than 32.5mpa, and shall meet the requirements of technical rules for construction of highway pavement base. Fineness and soundness of cement shall meet the requirements of specifications. Too little cement will reduce the cementation effect, and too much cement will increase the hydration heat reaction temperature, and the strength is too high to form cracks. Micro expansion cement has the characteristics of better early strength and micro expansion. This kind of cement can expand by the action of expansive agent during hydration, which makes up for the shrinkage of cement stabilized macadam, reduces the cracking of base course and improves the performance of pavement base course
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