DRAINAGE TIME OF POROUS ASPHALT MIXES DUE TO THE VARIOUS PROPORTION AND CONCENTRATION OF SOILS
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The function of porous pavement will be decreasing due to voids that are clogged by soil and dust. This condition is a common phenomenon until a certain period of time as this pavement has to be maintained by removing the trapped soil in voids. It is estimated that soil proportion, nominal maximum aggregate size and the cleansing method of trapped soil play a vital role in determining the loss of water drainage time. This paper presents the loss of drainage time based on the variety of soil proportions and concentrations. Drainage time after removing trapped soils from the voids of porous asphalt is also presented. There are three methods of removing the trapped soils from porous asphalt mix required tools such as a brush (k1), water sprayer (k2) and a vacuum cleaner (k3). The results showed that the proportion and concentration of soil used in this study influenced the loss of water drainage times. Drainage time value at the soil proportion of 85:15 is better than 57:43 proportions. This is verified by the decrease in drainage time value 2.6 and 1.9 times respectively when 25 grams and 10 grams soil were used. The equipment selection to remove trapped soil in voids of porous asphalt mix has to be considered. The vacuum cleansing method was found better compared to water sprayer and brush methods.