Semiflexible pavement (SFP), a composite pavement, is formed by filling into a very open porous asphalt skeleton a specifically designed water consistency fluid mortar with a very high early and 28-day strength. The amalgamation of both components will produce a SFP where it will replace the conventional wearing course. The main goal of this investigation is to study the effect of various aggregate gradations towards producing SFP. These include determining the optimum binder, volumetric properties, and durability and strength of each aggregate gradation. The final results were statistically analyzed and two factor variance analyses (ANOVA) were performed to check on the significance at certain confidence limits. The results confirmed that different aggregate gradations significantly affect the properties mentioned. 1. Introduction The most common pavement that is widely used is the flexible bituminous pavement or also known as asphalt pavement. It consists of asphalt as a binder mixed with a certain aggregate gradations to form a durable surface material laid down to sustain traffic loads. Bitumen is well known to be flexible and elastic which is why the total pavement structure deflects under loading Due to that, flexible pavement requires more layers to sustain the amount of load compared to concrete pavement. Concrete pavement on the other hand typically comprises of binder (cement), water, and aggregates. This type of structure deflects very little under loading due to its high modulus of elasticity of its surface course. Because of its relative rigidity, the pavement structure distributes loads over a wide area with only one or at most two structural layers compared to flexible pavement. Common road surfacing problems include surface cracks, rutting, and raveling which caused potholes and particle losses. Surface deterioration significantly affects the ease of travel and caused major rehabilitation for both flexible and rigid pavement. Rigid pavement on the other hand can be susceptible to relatively slow setting times during the construction phase and poor riding quality (and noise) caused by the joints required to accommodate differential expansion/contraction during service [1]. Road surfacing or the surface course demands an adequate quality and durability to ensure satisfactory riding quality. Studies have been done to increase the quality and durability of both mentioned pavements. These include cooperating crumb rubber modified binder, polymer modified binder, plastic modified binder, and so forth, and the usage of different type of
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