Evaluation method and influencing factors for construction workability of cement-emulsified asphalt mixture(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年01期
- Page:
- 41-48
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Evaluation method and influencing factors for construction workability of cement-emulsified asphalt mixture
- Author(s):
- ZHANG Cui-hong; JIAO Sheng-jie; CAO Xue-peng; YAN Yu-kui; CHEN Xiao-xue; QI Yan-qiu
- 1. Highway Maintenance Equipment National Engineering Laboratory, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Henan Gaoyuan Maintenance Technology of Highway Co. Ltd., Xinxiang 453003, Henan, China
- Keywords:
- road engineering; cement-emulsified asphalt mixture; torque value; mixing workability; paving workability; compaction performance
- PACS:
- U415.6
- DOI:
- -
- Abstract:
- In order to study the construction workability of cement-emulsified asphalt mixture and its effect on the compaction properties, the mixing torque value of cement-emulsified asphalt mixture was employed to represent construction workability on the basis of the surface free energy theory of asphalt. By employing the test equipment of mixing workability and superpave gyratory compactor (SGC), mixing torque value and compaction performance of the mixture were respectively measured. The optimal mix ratio scheme of the mixture at normal temperature was determined by the range analysis of compressive strength, and evaluation method and influencing factors for mixing workability of the mixture were proposed. According to the mixing states and mixing torque values, the optimum moisture content and recommended value of mixing time were determined for the mixture at 10 ℃,25 ℃ and 40 ℃. Analysis was did about the effect of paving workability on compaction performance for the mixtures at different initial compaction times under the three temperatures. The results show that moisture content has a significant effect on mixing workability of the mixture. The optimum moisture contents of the mixture are 5.25%, 6% and 6.5% at 10 ℃, 25 ℃ and 40 ℃, respectively. The recommended mixing time of the mixture at three temperatures is 12 s. As a whole, with the increase of temperature, the void fraction of specimen decreases and the compressive strength increases with the increase of torque value. The best construction temperature is 40 ℃. The optimal initial compaction times are 20 at 10 ℃ and 25 ℃, and the corresponding specimen compactness are 84.3% and 85%, respectively. The optimal initial compaction times are 30 at 40 ℃, and the corresponding specimen compactness is 85.7%. The evaluation method for mixing workability of the cement-emulsified asphalt mixture is able to offer reference for the mixing technology of pavement construction. The compactness value corresponding to the optimal initial compaction times can provide reference for the parameter selection and optimization combination about the frequency of vibrating beam and screed of paver.
Last Update: 2018-02-06