|
Of highway semi-rigid base pavement caused by reflective cracking , erosion , jack pulp and other diseases , the paper through application-level macadam base in order to reduce or eliminate these diseases . Throughout the grading design at home and abroad , the Bailey method take into account both the aggregate volume characteristics , but also has graded evaluation in the the skeleton dense mix design has the advantage , therefore , the introduction of U.S. Bailey method aggregate gradation design theory and MOV, design grading reasonable test . Within specifications , select 12 gradation, the Bailey method gradation evaluation showed that the integrated use the Bailey method parameters and the design density value of K can mixture gradation of coarse and fine types and skeleton embedded crowded conditions make proper evaluation . CA value and CBR correlation coefficient of 0.7028 , the K value and CBR correlation coefficient of 0.8178 , macadam performance evaluation level with the CBR , CA and K value of these three indicators is feasible . Paper presents gradation CA value of about 0.65 mixed material has good stability , it is recommended that the K value of 92.99 to 104.58 . Use of three graded , vibratory compaction and heavy compaction molding specimen . Comparison of the maximum dry density under different molding methods , graded attenuation , CBR and resilient modulus , the results show that the vibration molding design method and the construction site in a similar way , compared with the heavy compaction method , graded attenuation , the most good moisture content is reduced from 4.08% to 9.43% , the maximum dry density increased by 7.42% ~ 8.94%, CBR increased by 52.6% to 93.9% . This article uses the the rutting test method of a graded gravel , the method to simulate the grading macadam base of dynamic change , and this change of the internal stress caused by driving loads graded crushed stone aggregates embedded squeeze and slide shift change, can effectively evaluate the anti - loose -graded gravel and resistance to deformation . Graded gravel construction and quality control system analysis, the acceptance of construction quality indicators . In the water sector on the highway test section , the test section observations , the vibratory compaction graded gravel compaction and strength to meet the design requirements , grading macadam base denser , higher strength .
|