主要从事道路工程材料与结构的研究。

研究方向：

（1）新型沥青及沥青混合料研发与混合料配比优化研究；

（2）代用筑路材料的性能与修筑技术；

（3）沥青路面结构优化及设计；

（4）路基路面病害诊断与修复技术。

科研成果及学术贡献

（1）系统地开展干法、湿法橡胶沥青及混合法橡胶沥青混合料的研究，提出了干法橡胶沥青混合料级配设计方法，优化了湿法橡胶沥青的配制工艺研究，评估了各种橡胶沥青及混合料的性能；

（2）开发了基于废旧高分子材料与纳米材料的沥青混合料复合改性剂，并进行了推广应用；

（3）研究并推动了河砂、风化料等特殊材料修筑路基技术，参与制定地方标准3部；

（4）提出了有效解决重载交通沥青路面车辙病害的新技术路径，建立了车辙预估模型；

（5）发展了沥青混合料配合比设计理论及方法，开发了沥青混合料配合比设计及优化系统。

近年代表性学术论文

1. Shutang Liu, Weidong Cao^*, Xiaojun Li, et al. Principle analysis of mix design and performance evaluation on Superpave mixture modified with Buton rock asphalt, Construction and Building Materials, 2018 (176): 549~555 (SCI、EI)

2. Shutang Liu, Zhuozhi Li, Yingyong Li, Weidong Cao^*. Strength properties of Bayer red mud stabilized by lime-fly ash using orthogonal experiments, Construction and Building Materials, 2018 (166): 554~563 (SCI、EI)

3.Weidong Cao, Shutang Liu, Xinxin Li. Laboratory Evaluation of the Effect of Composite Modifier on the Performance of Asphalt Concrete Mixture, Construction and Building Materials, 2017 (155): 363~370 (SCI、EI)

4. Cao Weidong, Liu Shutang, Li Yingyong, Xue Zhichao. Rutting-Resistance Performance of SBS and Anti-Rutting Additive Composite-Modified Asphalt-Concrete Mixtures , Journal of Testing and Evaluation, 2016, 44(2):921~929 (SCI、EI)

5. Weidong Cao , Shutang Liu, Zhigang Feng. Comparison of performance of stone matrix asphalt mixtures using basalt and limestone aggregates, Construction and Building Materials, 2013, 41(4): 474~479 (SCI、EI)

6. Weidong Cao, Shutang Liu. Performance Evaluation of Asphalt-Rubber Stone Matrix Asphalt Mixtures with Warm Mix Asphalt Additives, Journal of Testing and Evaluation, 2013, 41(1): 141~147 (SCI、EI)

7. Cao, Wei-Dong ; Yao, Zhan-Yong; Liu, Shu-tang; Cui, Xin-Zhuang. Performance of Composite Modified Asphalt with Trinidad Lake Asphalt used as Waterproofing Material for Bridge Deck Pavement, Journal of Testing and Evaluation, 2009, 37(5): 463~467 (SCI、EI)

8. 曹卫东，刘树堂等.硅烷偶联剂对橡胶沥青性能的影响. 建筑材料学报，2009， 12(4): 497~500 (EI)

9. Cao, Weidong. Study on properties of recycled tire rubber modified asphalt mixtures using dry process, Construction and Building Materials, 2007, 21(5): 1011~1015 (SCI、EI)

10. 刘树堂, 曹卫东, 李英勇等. 未加沥青矿料VMAa 物理模型构建与应用, 中国公路学报, 2016, 29 (8): 1~11 (EI)

11. 刘树堂, 曹卫东, 任小刚等. Superpave体系级配设计关键技术分析与VMA曲线预测, 中国公路学报, 2015, 28 (2): 8~13(EI)

12. Shutang Liu, Weidong Cao, Xinlong Qi, Shengjun Ren. Research and Application of Statistical Law of VCA Formed from the Packing of Basalt Coarse Aggregates, Construction and Building Materials, 2014, 71(11): 484~491 (SCI、EI)

13. 刘树堂, 曹卫东, 李英勇, 房建果. 承载板测土基回弹模量关键技术分析与新计算方法, 中国公路学报, 2014, 27 (1): 23~29 (EI)

14. Shutang Liu, Weidong Cao, Shujie Shang, Hui Qi, Jianguo Fang. Analysis and Application of Relationships between Low-Temperature Rheological Performance Parameters of Asphalt Binders, Construction and Building Materials, 2010 (24): 471~478  (SCI、EI)

15. Shutang Liu*, Cheng Ma, Weidong Cao, Jianguo Fang. Influence of Aluminate Coupling Agent on Low-temperature Rheological Performance of Asphalt Mastic, Construction and Building Materials, 2010 (24): 650~659  (SCI、EI)

16.  Shutang Liu, Weidong Cao, Jianguo Fang, Shujie Shang. Variance Analysis and Performance Evaluation of Different Crumb Rubber Modified (CRM) Asphalt, Construction and Building Materials, 2009 (23):2701~2708  (SCI、EI)

17. 曹卫东，吕伟民. 废旧轮胎橡胶混合法改性沥青混合料的研究. 建筑材料学报, 2007, 10(1):110~114（EI）