摘要：The goal of this study was to compare the predicted void content with the actual void content of pervious concrete cylinders. All pervious concrete systems are designed with a void content in mind to facilitate a specific permeability;however, due to variable placing techniques and inherent issues with the material, the actual in place void content often varies from designed. This study quantifies this difference and attempts to develop a correction factor, such that design values are more approximate to in place pervious concrete systems. The analysis included multiple mixtures with three design void contents (15%, 25%, 35%), two aggregate types (angular and rounded), and three different water-to-cement ratios (0.33, 0.37, 0.41). These samples were methodically designed to contain a desired void ratio, then casted in the laboratory, in which the compaction of each sample was controlled for consistency. Following casting, the in-place void content was determined using ASTM C1754 and compared to the predicted. The difference was then averaged to create a correction factor requiring more or less cement paste, which was used to redesign the mixtures. The new mixtures were then compared to the predicted void content. The results of this study show that initial designs can vary from 3% - 15% on average from initial designed void content and that a correction factor can be used to obtain within 3% on average of the target void ratios.

摘要：据天津工业大学官网2017年7月7日讯近日,国际刊物Journal of Materials Chemistry A（IF=8.262）发表了分离膜与膜过程国家重点实验室高性能复合膜团队博士研究生石强、倪磊讲师、张宇峰教授等的论文,题为“Poly（p-phenyleneterephthamide）embedded in a polysulfone as the substrate for improving compaction resistance and adhesion of a thin film composite polyamide membrane＂．该研究从分子设计的角度提高功能层与基膜的结合牢度和基膜耐压性，为制备高稳定性聚酰胺复合膜提供了新思路．