Effect of milling material content and blending method on roadperformance of regeneration cement stabilized gravel(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年4期
- Page:
- 39-49
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Effect of milling material content and blending method on roadperformance of regeneration cement stabilized gravel
- Author(s):
- TIAN Yuan1; NIU Dongyu2
- (1. Xian Changda Asset Management Co., Ltd., Changan University, Xian 710064, Shaanxi, China；2. School of Materials Science and Engineering, Changan University, Xian 710061, Shaanxi, China)
- Keywords:
- road engineering; regeneration cement stabilized gravel; milling material; gradation design; road performance
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the influence of milling planer mixing method and milling planer particle size on the stability of regeneration cement gravel road, 13 groups of grading with different milling materials and different blending methods, using the grading design method of overall blending and grading blending based on the physical and mechanical properties of milling materials and screening test were studied. Through 7 d compressive strength test, 28 d splitting strength test, 28 d dry shrinkage performance test and 28 d anti scour performance test, the influence of milling material content and mixing mode on the road performance of recycled cement stabilized macadam was analysed. The results show that the higher the content of milling material is, the greater the optimum moisture content and the smaller the maximum dry density is, and the void ratio of recycled cement stabilized macadam is much higher than that of ordinary cement stabilized macadam. With the increase of milling material content, the 7 d compressive strength and 28 d cleavage strength of recycled cement stabilized macadam decrease, the 28 d dry shrinkage coefficient and the erosion quality loss rate increase. When the whole mixture is used, the 7 d compressive strength of the fully recycled cement stabilized macadam (the amount of milling material is 100%, mass fraction, the same below) is 16.3% lower than that of the common cement stabilized macadam (the amount of milling material is 0%), the 28 d splitting strength reduces by 25%, while the 28 d dry shrinkage coefficient is 16.4% higher, and the erosion mass loss rate increases by 62.3%. The mixing method of milling materials has a great influence on the road performance of recycled cement stabilized macadam. When natural macadam is used to replace milling materials, the smaller the replacement particle size is, the smaller the compressive strength, splitting strength and dry shrinkage coefficients are, and the greater the loss rate of scouring quality is. When the milling material content is 75%, after replacing the 20 to 30 mm milling material with natural crushed stone. The 7 d compressive strength of graded recycled water stabilized crushed stone (F7530) is increased by 4.8%, compared with the whole mixed recycled water stabilized crushed stone(XT75), the 28 d splitting strength increases by 4.4%, the erosion mass loss rate decreases by 4.6%, and the dry shrinkage coefficient increases by 3%, after replacing the 0 to 5 mm milling material with the natural macadam, that are 4.1%, 3%, -2.3%, 2.5%. 6 tabs, 11 figs, 26 refs.
Last Update: 2020-07-31