Hi,Road Materials are the materials which are used for the construction of the roads, commonly used road materials are, soil, Aggregates and binders.Soil is used for the construction of the bottom most layer of the pavement, i.e. sub-grade. Here is a short details of the sub-grade and its function.: Soil as sub-grade material sub-grade is […]
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Hi, Rigid Pavements are constructed with materials like Cement Concrete (Plain, reinforced or prestressed.) Here the load is transferred through the slab action, not like in the flexible pavements. Westergaard’s theory is considered good to design rigid pavements. In this theory, rigid pavement slab is considered as a thin elastic plate resting on soil sub-grade,
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5. What is the value of intermediate sight distance for a highway with a design speed of 65 kmph? Assuming the data for co-efficient of friction f = 0.36 and for reaction time t = 2.5 sec.Ans: 182.8 m 6. The speed of overtaking and overtaken vehicles are 70 and 40 kmph respectively on a
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1. The safe stopping sight distance for design speed of 50 kmph two way traffic on a two lane road assuming co-efficient of friction as 0.37 and reaction time as 2.5 seconds is 61.4 m.2. The stopping sight distance for design speed of 80 kmph for two way traffic on a single lane road. Assume
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Hi, CBR loading frame Aim: To find out the CBR(California bearing ratio) value of the given soil sub-grade. Apparatus: CBR Apparatus soil sample with known OMC and MDD. CBR apparatus – accessories Theory: California Bearing Ratio test was invented by California State Highway Department. This test is used to design the thickness of the flexible pavement.
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AIM: To find the aggregate Impact value. Theory: Aggregate to be used as road materials must possess some properties or characteristics. Toughness is one of the highly required property which is necessary for the aggregates to bear the impact loads. Road aggregates are applied with the impact loads a millions of times in their life
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Hi, Location of the highway alignment is done after carrying out a survey of the area, these surveys are called Engineering Surveys. We have to locate an alignment which fulfils the basic requirements like the path must be short, safe, economic, easy and useful. To check all these basic requirements we can carry out the
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Hi There are some basic requirements of the highway alignment in the plain and hill roads which must be fulfilled. In general, the basic requirements of any road alignment, on hills, are as follows. Short The alignment must be the shortest of the various alternatives available. Of course, the shortest path between any two points
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