Based on the nearest surface function formula, a quantitative formula to measure the overlapping degree between the interfacial transition zone （ITZ） of neighboring aggregate particles was put forward. The formula w...Based on the nearest surface function formula, a quantitative formula to measure the overlapping degree between the interfacial transition zone （ITZ） of neighboring aggregate particles was put forward. The formula was further deduced to quantitatively analyze the influence of the volume fraction of aggregate, ITZ thickness and the maximum aggregate diameter on the overlapping degree between neighboring ITZ. The volume of ITZ was quantitatively calculated in actual concrete by comparing the nearest surface function formula with an approximate method, that is the surface area of the aggregates multiplied by the uniform thickness of the ITZ layers. The results showed that the influencing order of these three factors on the overlapping degree between neighboring ITZ in turn was the interface thickness, aggregate volume fraction and the maximum aggregate diameter; As long as the interface thickness 50 μm and the aggregate volume fraction 50%, the calculated error between two methods mentioned above is about 10 %.展开更多
Based on the expression of the index of coil interpenetration （i.e., the degree of coil overlap, ξb） of amorphous polymers in the bulk state proposed by Qian, the ξb was rewritten as ξb = ρb [η]θ/1.66 via Hory...Based on the expression of the index of coil interpenetration （i.e., the degree of coil overlap, ξb） of amorphous polymers in the bulk state proposed by Qian, the ξb was rewritten as ξb = ρb [η]θ/1.66 via Hory＇s intrinsic viscosity equation at them conditions. The ξb ofpoly （vinyl chloride） （PVC） dense membranes with different molecular weights and cellulose diacetate （CA） dense membranes prepared using different solvents were determined. The permeability, permeation coefficient （P） of nitrogen and permeation flux （J） of liquid through both membranes, respectively, was measured. P and J decreased exponentially with increasing ξb for PVC and CA membranes were revealed.展开更多
基金Funded by the National Basic Research Program of China (No.2009CB623203)National High-tech R&D Program of China (No.2008AA030794)Postgraduates Research Innovation in University of Jiangsu Province in China (No.CX10B-064Z)
文摘Based on the nearest surface function formula, a quantitative formula to measure the overlapping degree between the interfacial transition zone （ITZ） of neighboring aggregate particles was put forward. The formula was further deduced to quantitatively analyze the influence of the volume fraction of aggregate, ITZ thickness and the maximum aggregate diameter on the overlapping degree between neighboring ITZ. The volume of ITZ was quantitatively calculated in actual concrete by comparing the nearest surface function formula with an approximate method, that is the surface area of the aggregates multiplied by the uniform thickness of the ITZ layers. The results showed that the influencing order of these three factors on the overlapping degree between neighboring ITZ in turn was the interface thickness, aggregate volume fraction and the maximum aggregate diameter; As long as the interface thickness 50 μm and the aggregate volume fraction 50%, the calculated error between two methods mentioned above is about 10 %.
文摘Based on the expression of the index of coil interpenetration （i.e., the degree of coil overlap, ξb） of amorphous polymers in the bulk state proposed by Qian, the ξb was rewritten as ξb = ρb [η]θ/1.66 via Hory＇s intrinsic viscosity equation at them conditions. The ξb ofpoly （vinyl chloride） （PVC） dense membranes with different molecular weights and cellulose diacetate （CA） dense membranes prepared using different solvents were determined. The permeability, permeation coefficient （P） of nitrogen and permeation flux （J） of liquid through both membranes, respectively, was measured. P and J decreased exponentially with increasing ξb for PVC and CA membranes were revealed.
