Note for Pavement Materials and Constructions - PMC By Md Rafique

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VTUlive.com 1 PAVEMENT MATERIALS AND CONSTRUCTION 10CV763 SYLLABUS Subcode: 10CV763 IA Marks: 25 No of lecture hour/week: 04 Exam hours: 03 Total no of lecture hours: 52 Exam marks: 100 PART - A PAVEMENT MATERIALS UNIT - 1 AGGREGATES: Origin, classification, requirements, properties and tests on road aggregates, concepts of size and gradation – design gradation, maximum aggregate size, aggregate blending to meet specification. 6 Hours UNIT - 2 BITUMEN AND TAR: Origin, preparation, properties and chemical constitution of bituminous road binders; requirements. 4 Hours UNIT - 3 BITUMINOUS EMULSIONS AND CUTBACKS: Preparation, characteristics, uses and tests. Adhesion of Bituminous Binders to Road Aggregates: Adhesion failure, mechanism of stripping, tests and methods of improving adhesion. 8 Hours UNIT - 4 BITUMINOUS MIXES: Mechanical properties, dense and open textured mixes, flexibility and brittleness, (no Hveem Stabilometer & Hubbar – Field Tests) bituminous mix, design methods using Rothfuch‟ s Method only and specification using different criteria- voids in mineral aggregates, voids in total mix, density, flow, stability, percentage voids filled with bitumen. 6 Hours DEPT OF CIVIL ENGINEERING, SJBIT Page 1

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VTUlive.com 2 PAVEMENT MATERIALS AND CONSTRUCTION 10CV763 PART - B PAVEMENT CONSTRUCTION UNIT - 5 EQUIPMENT IN HIGHWAY CONSTRUCTION: Various types of equipment for excavation, grading and compaction – their working principle, advantages and limitations. Special equipment for bituminous and cement concrete pavement and stabilized soil road construction. 6 Hou UNIT - 6 SUBGRADE: Earthwork grading and construction of embankments and cuts for roads. Preparation of subgrade, quality control tests. 6 Hours UNIT - 7 FLEXIBLE PAVEMENTS: Specifications of materials, construction method and field control checks for various types of flexible pavement layers. 8 Hours UNIT - 8 CEMENT CONCRETE PAVEMENTS: Specifications and method of cement concrete pavement construction; Quality control tests; Construction of various types of joints. 8Hours DEPT OF CIVIL ENGINEERING, SJBIT Page 2

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VTUlive.com 3 PAVEMENT MATERIALS AND CONSTRUCTION 10CV763 LIST OF CONTENTS UNIT 1 2 3 4 5 6 7 8 TOPIC AGGREGATES BITUMEN AND TAR BITUMINOUS EMULSIONS AND CUTBACKS BITUMEN MIXES EQUIPMENT IN HIGHWAY CONSTRUCTION SUBGRADE FLEXIBLE PAVEMENTS CEMENT CONCRETE PAVEMENTS DEPT OF CIVIL ENGINEERING, SJBIT PAGE NO 4 14 17 23 29 36 40 60 Page 3

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VTUlive.com 4 PAVEMENT MATERIALS AND CONSTRUCTION 10CV763 Unit -1: AGGREGATES Aggregates form the major portion of pavement structure and they form the prime materials used in pavement construction. 1.1 Origin:         Most of the aggregates are prepared from natural rock Gravel aggregates are obtained from river beds.   Sand in fine aggregates from weathering of rock.  Based on the origin,  natural rocks are classified as igneous, sedimentary and metamorphic. 1.2 Classification:     The aggregates are specified based on their grain size, shape, texture and  its gradation and it is specified by various agencies like ASTM, BSI, ISI and IRC. Based on strength property, the coarse aggregates are divided into hard aggregates and soft aggregates. 1.3 Requirements: Aggregates have to bear stresses occurring due to the wheel loads on the pavement. It has to resist wear due to abrasive action of traffic on the surface course. It should resist disintegration due to the action of weather. 1.4 Properties of aggregates: Strength:     The aggregates should be strong to withstand the stresses due to traffic wheel load.  Aggregates used in top layers of pavements I.e. wearing course have to be capable  of withstanding high stresses in addition to wear and tear hence should posses resistance to crushing.  Hardness  The aggregate used in surface course are subjected to constant rubbing or abrasion due to moving traffic. DEPT OF CIVIL ENGINEERING, SJBIT Page 4