Porous concrete pavement is being used as one of the solution to decrease the storm water runoff by capturing and allowing rain water to drain into the land surface. The main problem of porous concrete pavement is the strength itself. The objective of this paper is to review the use and performance of Nano-silica in porous concrete pavement. From the literature review of the previous research, it was found that the conventional porous concrete pavement doesn't has good strength for pavement purpose. An addition of Nano-material will improve the physical and chemical properties of the porous concrete pavement.

Nowadays, there are a lot of damaged of road pavement and it become a very serious issue in Malaysia. To minimise the damage of pavement surface and increase durability of flexible pavement, the conventional bitumen needs to be improved with regards to performance related properties. Thus, this study is to investigate the effect of rubber dipping by-product (RDP) on bitumen properties. In order to achieve this aim, the objectives of this study are; i) to determine of non-modified bitumen and the effect of added RDP in different concentration on bitumen properties; and ii) to compare non-modified bitumen and RDP modified bitumen in terms of physical properties. RDP is waste material from natural rubber industrial and it is in solid forms. Bitumen grade 80/100 PEN was used in this study. Laboratory tests were penetration, softening point, viscosity, rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests. The findings show that addition of RDP causes the modified bitumen harder than before, indicate higher temperature susceptibility and increased viscosity properties. From the study stated that the suggested proportion of RDP to be mixed with bitumen is 10 percent by total weight.

Rice husk ash (RHA) as replacement material in the conventional concrete mixture has widely investigated around the world. However, there is a lack of study on nanoparticle produced from black rice husk ash (BRHA) used as a replacement material in porous concrete pavement mixture. Therefore, this study aims to evaluate the flexural strength properties of porous concrete pavement containing nano black rice husk ash. A nano BRHA dosage of 0, 10, 20, 30 and 40% by weight of binder used throughout the experiments. The total cementitious content used was 450 kg/m3 with a water/binder ratio of 0.34. It found that there appears to be an optimum replacement of approximately 10% nano BRHA, during which time the flexural strength and flexural activity index increase significantly.

Porous concrete technology has been used since 1970s in various parts of the United State as an option to complex drainage systems and water retention areas.Porous concrete pavements have become popular as an effective stormwater management device to control the stormwater runoff in pavement. The objective of this paper is to study a pre-review on Porous concrete pavement and it previous laboratory study. From the literature, it was found that, the strength of the porous concrete pavementstill need to improve. To improve the strength of the porous concrete, various additive have been study as a part of porous concrete mix and yetthe optimum condition to produce good porous concrete still not been established. From the previous study, it was found that to prepare the porous concrete laboratory specimen, the use of standard Proctor hammer (2.5kg) and Pneumatic press (70 kPa compaction effort) resulted in the closest properties to the field porous concrete.

The high percentage of porosity in porous concrete pavement tends to decrease its strength. In concrete industry, nano silica is one of the most popular materials that will improve the properties of cementitious materials. This paper, prepared to review the effect of nano silica in cement paste and mortar related to porous concrete pavement. It was found that, by incorporating nano silica with the right composition in cement paste and mortar, it will improve their mechanical properties. By incorporating nano silica in the mixture, it can be predicted that the strengthening effect of nano silica would be further enhanced in porous concrete because the nano silica improve not only the cement paste, but also the interface between paste and aggregate.