| As the typical representative of semi-rigid base, cement stabilized macadam base iswidely used in China, however, it has produced a lot of cracking as well. Apart from naturalclimate and vehicle loads, another element to result in cracking is that our country takesbottom layer tensile stress as pavement structure design index in the design code, but formaterial composition design and construction control, the design index is7-day unconfinedcompressive strength without any requirements for tensile property, which causes thedifference between pavement structure design code and material composition design andconstruction control.At the same time, relaying on only one material composition design index, we can’tdesign the cement stabilized macadam base with excellent anti-cracking performance. It hasbeen shown by many researches that indoor tests which used vibration compaction andvibration molding well could fully simulate construction site and ensure the skeletal densestructure, so this paper carried out a study on material composition design index of cementstabilized macadam combined with indoor tests using vibration molding method, in order toput forward with rational design index, fully considering anti-cracking performance.So thestudy came up with a rational prediction model on the basis of the factors affecting splittingstrength and strength increasing trend of vibration molding cement stabilized macadammixture.Then, the study took use of grey relational analysis to get the index which evaluatesthe anti-shrinkage cracking performance of cement stabilized macadam sensibly and controlsthe material composition design index, hoping to design the cement stabilized macadam withgood anti-shrinkage cracking performance.In summary, so as to improve the cracking of cement stabilized macadam baseeffectively, this paper carried out a study on material composition design index of vibrationmolding cement stabilized macadam, anti-shrinkage cracking performance considered. |
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