摘要
设计并成型浇注式沥青混合料(GA)+高弹改性S M A复合结构试件以及SMA和G A单一结构试件。在不同加载速率和不同温度下分别进行单轴贯入试验,试验结果表明:复合结构在不同加载速率的贯人强度在GA和SMA之间,随着加载速率的增加,SMA的贯人强度不断提高,复合结构和GA的贯入强度先增大后减小。随着温度升髙,复合结构和单一结构的贯人强度显著下降,温度对SMA和复合结构破坏时形变量影响较小,而对GA影响很大,SMA提高了复合结构的抗变形能力。复合结构的破坏发生在上层SMA,虽然下层GA没有发生破坏,但是高温时发生较大的流动变形,需要在桥面铺装底面层GA设计时予以重视。
Both composite structure specimens of gussasphalt mixture(GA)+SMA and single structure specimens of GA and SMA were designed and molded.Uniaxial penetration tests were carried out at different loading rates and temperatures.The test results show that,the penetration strength of composite structure is between GA and SMA at different loading rates.With the increase of loading rate,the penetration strength of SMA increases continuously,while the penetration strength of composite structure and GA increases first and then decreases.As temperature increases,the penetration strength of composite structure and single structure decreases significantly.Temperature has slight influence on the deformation of composite structure and SMA when they fail and great influence on the deformation of GA when it fails,which shows that SMA improves the deformation resistance of composite structures.The failure of composite structure occurs in SMA of top layer.Though GA of bottom layer doesn’t fail,large flow deformation occurs at high temperature,which should be paid attention to the design of GA of bottom layer in bridge deck pavement.
出处
《上海公路》
2019年第4期65-68,89,M0003,共6页
Shanghai Highways
基金
乌鲁木齐市建设科技项目资助(201803)
关键词
沥青混合料
复合结构
单轴贯人试验
桥面铺装
asphalt mixture
composite structure
uniaxial penetration test
bridge deck pavement
