ZHANG Shoumei. Development and Improvement For Environmental Protection Sound-absorbing Material [J]. J Ceram (in Chinese), 2002, 23(1): 56-61. [2] JIN Xueli, ZENG Lingke. Polypropylene fiber for sound-absorbing material in underground railways [J]. J Chin Ceram Soc (in Chinese), 2006, 12(34): 1475-1480. [3] JIN Xueli, ZENG Lingke. Sound absroption characteristics and air- flow resistivity determination of metro sound absorbed material [J]. J Synthetic Cryst, 2008, 8(37): 918-926. [4] QIN Xuanyun, CUI Caihong, GU Chengling, et al. Research on the porosity factor of dual fractal porous media [J]. J Jiamusi Univ: Nat Sci Ed, 2008, 5(26): 680-682. [5] GUO Wenjie, WAN Jinquan, MA Yiwen, et al. Fractal Analysis of Pore Structure of Eucalyptus Pulp Fibers [J]. J South China Univ Technol: Nat Sci Ed, 2009, 12(37): 70-74. [6] YE Jiandong, LUO Fangcong. Effect of porogen morphology on structure and property of calcium phosphate cement scaffold [J]. J South China Univ Technol: Nat Sci Ed, 2010, 4(38): 71-75. [7] IWASE T. Acoustic Properties of porous pavement with double layers and its reduction effects for road traffic noise [J]. Proceedings of Inter Noise 2000, Nice, France, 2000, 8: 6-12. [8] ZHU Boquan, FANG Binxiang, LI Xiangcheng, et al. Fractal characteristics of pore structure of corundum based castables [J]. J Chin Ceram Soc (in Chinese), 2010, 4(38): 730-734. [9] BRENNAN M J, TO W M. Acoustic properties of rigid frame porous materials-an engineering perspective [J]. Applied Acoustics 1998, 62: 793-811. [10] ZHANG Xiaozhen, ZHOU Jian'er, JIANG Yuhua, et al, LARBOT Andre. Preparation and Characterization of Low Cost Macroporous Support for Ceramic Membrane [J]. J Chin Ceram Soc (in Chinese), 2009, 3(37): 447-452. [11] JOHNSON D L, KOPLIK J, DASHEN R. Theory of dynamic permeability and tortuosity in fluid saturated porous media [J]. J Fluid Mech, 1987: 176: 379-402. [12] MAA D Y. Microperforated-panel wideband absorbers [J]. Noise Control Engineering Journal, 1987, 29: 77-84. [13] YANG Wencui, GE Yong, YUAN Jie, et al. Effect of Inorganic Salts on Degree of Hydration and Pore Structure of Cement Pastes [J]. J Chin Ceram Soc, 2009, 4(37): 622-626. [14] MAROLF A, NEITHALATH N, SELL E, et al. Influence of aggregate size and gradation on acoustic absorption of Enhanced Porosity Concrete [J]. ACI Mater J, 2004, 101(1): 82-91. [15] NEITHALATH N. Development and characterization of acoustically efficient cementitious materials [J]. Ph.D. Thesis, Purdue University, 2004, 1: 242.