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首页> 美国政府科技报告 >Service Performance Of Cement Treated Bases As Used in Composite Pavements.
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Service Performance Of Cement Treated Bases As Used in Composite Pavements.

机译：水泥处理基层在复合路面中的使用性能。

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One hundred seventy-five Cement Treated Base (CTB) composite pavements, with varying cement contents, built between 1950 and 1962 were evaluated. Sixty-four percent are giving excellent service, seventeen percent were rated good, eight percent fair and eleven percent required extensive maintenance early in their design lives. The main causes of failure appeared to be insufficient cement content, poor mixing of cement, excessive trimming of the compacted CTB, insufficient CTB thickness, inadequate CTB compaction of deficiencies in the AC surfacing thickness or quality. A significant improvement in the performance of CTB composite pavements was attributed to: (1) Extending the CTB at least one foot into the shoulder. (2) Plant mixing the CTB. (3) Building the project in a temperate climate. (4) increasing the thickness of the AC surfacing. (5) Limiting the compacted thickness of any one layer of CTB to 0.50 foot. (6) Using type II rather than type I cement. (7) Using a minimum CTB thickness of 0.50 foot. (8) Providing a minimum in place CTB compressive strength of 500 psi.

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