基金Acknowledgements This study was financially supported by National Natural Science Foundation of China (No. 21346011) and the Key Project of Natural Science foundation Research Plan of Shaanxi Province (No. 2013JZ014).
基金This study was financially supported by National Natural Science Foundation of China (No. 2t346011), the Key Project of Natural Science foundation Research Plan of Shaanxi Province (No. 2013JZ014), and Building Materials Branch, State Key Laboratory of Architecture Science and Technology in West China (No. K09129).