Bearing and surface planeness of formation 1 Subject The item of standards This standard shall determine the basic characteristics and properties of the material in the final layer of substructure - roadbed, most for the test to the most necessary tests for determination of these characteristics, control methods and criteria of load capacity and straightness. 2 Definition 2.1 Roadbed is the final layer of substructure uniform load of uniform capacity whose thickness is up to 50 cm, depending on the type of material. 2.2. The bearing capacity of material in the roadbed is determined by one of the following ways: - measuring of bearing ratio CBR (JUS U.B1.042), - measuring of modulus k, module of reaction k- achieved by measuring of the compactness obtained (JUS U.B1.038) - measuring of the compressibility modulus of compressibility Ms by general plate (JUS U.B1.046) or measuring with module of deformability Ev, - the measuring the of deflection by deflectometer. Load Index CBR2 is used in the dimensioning of carriageway with asphalt surfacing concrete pavemen t, module of reaction K to when sizing during the dimensioning of concrete pavements.and other indicators of control works The other indexes are used during the control of works. 3 Determination of indicators of capacity for dimensioning 3.1 Asphalt pavement structure3.1.1 The determination of capacity assessment load-capacity index by CBR2 evaluationIn During the preparation of the Preliminary and Main project Designs of routes roads that belong to 4 and 5 class category, it is allowed to be used use and the estimated values of the load-capacity index CBR2 in from Table 1, depending on the type of material (according to the classification gi...
