The vertical porosity profile of pervious concrete (PC) is dictated by various mix design parameters, including aggregate/cement (a/c) ratio, compaction type and effort. In the presented work, an attempt was made to reveal the profound impacts of these parameters on porosity and strength. Vertical profile analysis using image processing techniques revealed that a zone approximately 10–15 mm thick with high porosity was observed at the top and bottom ends of a cylindrical PC core (13–20% of total PC thickness in total). Total porosities in that zone were 20–42% and 35–60% for lower and higher a/c ratios, respectively. The middle span of 120–130 mm of the vertical profile showed porosity variations of 5–15% and 30–45% for low and high a/c ratios, respectively. Overall, the a/c ratio and compaction effort manifested a profound impact on the vertical porosity profile. Compaction types showed trivial impact on porosity and compressive strength properties of PC for a/c ratios from 3.0 to 5.0. The authors recommend that the findings of this study would help to obtain the required porosity profile in PC without compromising strength characteristics.

中文翻译：

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参数对透水混凝土垂直孔隙分布的影响

透水混凝土 (PC) 的垂直孔隙率分布由各种配合比设计参数决定，包括骨料/水泥 (a/c) 比、压实类型和工作量。在目前的工作中，试图揭示这些参数对孔隙率和强度的深远影响。使用图像处理技术的垂直剖面分析表明，在圆柱形 PC 芯的顶端和底端观察到一个厚度约为 10-15 毫米的高孔隙率区域（总 PC 厚度的 13-20%）。对于较低和较高的 a/c 比，该区域的总孔隙率分别为 20-42% 和 35-60%。垂直剖面 120-130 毫米的中间跨度显示低和高 a/c 比的孔隙率变化分别为 5-15% 和 30-45%。全面的，a/c 比和压实力对垂直孔隙度剖面产生了深远的影响。对于 3.0 至 5.0 的 a/c 比率，压实类型对 PC 的孔隙率和抗压强度性能影响很小。作者建议，这项研究的结果将有助于在不影响强度特性的情况下获得所需的 PC 孔隙率分布。