Laboratory Base Pavement Surface Analysis Based on Materials Characterization

Skid resistance is a condition parameter that characterizes the contribution that a road surface makes to the level of friction available at the contact patch between a road surface and vehicle tire during acceleration, breaking and cornering manoeuvres. The surface texture and the surface course properties affect the roughness (microtexture, macrotexture and megatexture) which is influenced by traffic, weather and the environment. Some statistics data indicate that the number of accidents increases by up to two folds during rainy conditions. The PSV value of the aggregates used is a significant but not the sole influencing factor. The Polished Stone Value is determined under standard laboratory conditions and indicates to which extent an aggregate is resistant to polishing under the action of traffic. Skid resistance changes over time. Typically it increases in the first two years following construction as the roadway is worn away by traffic and rough aggregate surfaces become exposed, and then decreases over the remaining pavement life as aggregates become more polished.

In the present study, skid resistance and aggregate polishing value were conducted under varying bitumen content and using fillers materials like cement, fly ash. Texture depth is also a direct measure of area of contacts between tire and HMA surface so it also has the direct effect on pavement surface skidding.  Portable pendulum type skid resistance tester (ASTM E303 - 93) was used to obtain the skid resistance value and the polishing stone value. This testing is conducted under critical condition like dry and wet surface. The Guide for pavement friction NCHRP document-108, ASTM is referring for the friction mechanism, pavement-tire interaction, and machine recommendation. Main conclusion is the comparison of skid resistance value under several mixing condition.