<正>研究了水灰比、孔隙率、级配、增强剂（硅灰、苯丙乳液）对多孔水泥混凝土抗压强度、抗折强度的影响。结果表明：随着水灰比的增加，混凝土的抗折和抗压强度先增后减，存在一个最佳水灰比值；多孔水泥混凝土的抗压强度和抗折强度随孔隙率的增大而明显下降；另外，改变级配和增强剂的添加也会影响其力学性能。

The progress in methods for the isolation and fractionation of Lignin-carbohydrate complexes(LCC) from plant fibrous materials, pulps and their alkali extraction liquor were reviewed, focusing particularly on comparing various method characteristics in yield, purity, fractionation and representative of LCCs. Several specific methods for the isolation and fractionation of LCC from various samples were proposed respectively. The reasonable combination of physical method, chemistry method and biological technology should be emphasized in further research, and the establishment of economic, industrialization isolation method is one of the development trends of LCCs isolation and fractionation in the future.