不同养生龄期下VAE改性乳化沥青冷再生混合料的路用性能
Road Performance of VAE Modified Emulsified Asphalt Cold Recycled Mixture Under Different Curing Ages
林军 1许敏 1张敏 2陈琳涛 3姚爱玲 3王磊挺4
作者信息
- 1. 内蒙古阿拉善盟交通投资有限公司,内蒙古阿拉善盟 750306
- 2. 山西省交通建设中心,山西太原 030006
- 3. 长安大学公路学院,陕西西安 710064
- 4. 浙江交通投资集团高速公路杭州南管理中心,浙江杭州 311200
- 折叠
摘要
乳化沥青冷再生技术应用于道路工程时,常因养生龄期的限制和冷再生混合料自身水稳定性不足导致出现各种路面病害.以提高冷再生混合料的水稳定性为出发点,采用一种新型的改性剂醋酸乙烯-乙烯共聚物(VAE)对乳化沥青进行改性;探究VAE改性乳化沥青冷再生混合料在较长养生期间其路用性能的变化规律,以普通乳化沥青冷再生混合料为参照,采用干湿劈裂试验、冻融劈裂试验、20℃肯塔堡飞散试验、车辙试验和-10℃弯曲试验综合分析VAE改性乳化沥青冷再生混合料的路用性能,并从微观角度分析VAE改性乳化沥青冷再生混合料性能提升的机理.试验与分析结果表明:养生3～7 d是乳化沥青冷再生混合料发育形成强度的关键阶段;无论从水稳定性、抗剥落性方面还是高低温性能方面,VAE改性乳化沥青混合料的各项性能均优于普通乳化沥青冷再生混合料,具有推广应用价值.
Abstract
When emulsified asphalt cold recycling technology is applied to road engineering,various pavement diseases often occur due to the limitation of curing age and the insufficient water stability of cold recycled mixture.In this paper,in order to improve the water stability of cold recycled mixture,a new modifier ethylene-vinyl acetate copolymer(VAE)was used to modify emulsified asphalt.The variation law of road performance of VAE modified emulsified asphalt cold recycled mixture during a long curing period was explored.Taking the ordinary emulsified asphalt cold recycled mixture as a comparison,the road performance of VAE modified emulsified asphalt cold recycled mixture was comprehensively analyzed by dry-wet splitting test,freeze-thaw splitting test,20 ℃ Cantabro Test,rutting test and-10 ℃ bending test,and the mechanism of performance improvement of VAE modified emulsified asphalt cold recycled mixture was analyzed from a microscopic perspective.Test and analysis results show that:3～7 d is the key stage of emulsified asphalt cold recycled mixture strength development;no matter from the water stability,anti-stripping or high and low temperature performance,the performance of VAE modified emulsified asphalt mixture is better than ordinary emulsified asphalt cold recycled mixture,which has application value.
关键词
养生龄期/VAE改性乳化沥青/冷再生混合料/水稳定性/路用性能Key words
curing ages/VAE modified emulsified asphalt/cold recycled mixture/water stability/road performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据