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Feb 04, 2013· Hello There! Functions of various components of Pavement: There are four pavement layers: 1. Sub-grade 2. Sub-base 3. Base 4. Surface course Functions of each layer, and various tests performed on them, are listed and described below in brief. Sub-Grade : Functions: The load is transferred by the sub-grade effectively to the earth …
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Jan 01, 2022· The mineral composition and the characteristics of the recycled materials depend on the source, extraction process, and handling of the waste. A proper stabilized base or sub-base layer provides a transitional load-bearing stratum between pavement layers and efficiently transfers the wheel loads to the lower subgrade course.
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Mar 23, 2020· Also, Read: Granular Sub Base Construction and Quality Control. ... The material shall be spread in layers of a uniform thickness not exceeding 250mm of compacted thickness. A grader or a combination of dozer and grader can be used for this activity. ... Additional base layers can help to spread pavement loads over a larger …
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Binder materials such as bitumen and cement mixed with appropriate types and proportions of aggregates are used for the construction of superior types of roads that are characterised by their durability and load-carrying capacity. Thus, base courses, sub-base courses and even the surface or wearing courses require the use of these materials. 1 ...
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Granular Sub Base(GSB) is a natural or designed construction material used as a sub-base layer for road construction. Granular Sub Base is a layer in the road foundation just above the compacted sub-grade layer. ... confirming Table 400.1 shall be spread in layers of uniform thickness of 200 mm compacted thickness for new flexible pavement, and ...
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D. Base Course - One or more layers of specified material of designed thickness, placed on a subbase course or a subgrade to support a surface course. E. Surface Course - The upper portion of the pavement structure consisting of a mixture of mineral aggregates and bituminous material or Portland cement concrete.
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Introduction. The need for a subbase - a layer of granular material placed on a prepared subgrade - depends on the frequency of heavy truck loadings. While mandatory for major highways, a subbase is seldom required for light-duty concrete pavements. Performance studies and surveys have shown the conditions for which a subbase is or is not required.
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Aug 12, 2020· Functions of Sub-grade: To provide support to the pavements. Sub-grade carries entire load of pavement including the traffic. 2. Sub-base : Definition: A layer of granular material provided in between the sub-grade and the base course in a road pavement is called sub-base. Functions of Sub-base : It improves the bearing capacity …
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(unsuitable) construction of the subgrade and sub-base materials. This permanent deterioration in a well-designed pavement is fairly load distributed between the pavement layers of materials. In Ethiopia, Road deterioration could be in the form of cracks, potholes, surface deformation, and surface
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Subgrade soil is the most important component of road pavement. If the sub grade is weak, it affects the durability of the road pavement, hence the bearing capacity of sub grade soil should be sufficient for long term durability. ... And subbase is the layer of aggregate material placed on the subgrade on which the base course layer is located ...
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For weak and poor quality subgrade, there is a need to increase the thickness of pavement to compensate for it. In order to save cost for sub-base which is relatively expensive, the concept of capping layer is introduced in which capping materials of cheap but strong nature are used to cap the weak subgrade.
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The sub base materials are usually the first layer to be placed on the subgrade of the pavement. This layer is spread and compacted with a specific characteristics and thickness across the entire width of the subgrade. The function of sub base materials in the pavement is as follows: * Pressures Reduction
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Mar 06, 2020· Pavement systems generally consist of three layers: prepared subgrade, subbase, and pavement. This section will deal with the proper design and construction of subbases. The subbase is the layer of aggregate material that lies immediately below the pavement and usually consists of crushed
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May 05, 2019· Juan Rodriguez. A solid subbase is a key to a successful building project. A slab on ground and pavements normally are designed to be supported by a solid subbase, which needs to be uniform by nature to support the structure above it. A subbase will go on top of the subgrade, which typically is native soil or improved soil that has been compacted.
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