Grameen Sampark Final April 0... - pmgsy

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6 Interlocking Concrete Block Pavement Interlocking Concrete Block Pavement (ICBP) has been extensively used in a number of countries for many years, as a specialized problem-solving technique, for providing pavements in areas where conventional types of construction are not possible and also are less durable due to many operational and environmental constraints. ICBP technology found its application in India, a decade before, for specific requirements viz. footpaths, fuel stations, parking areas etc. This technology is now being adopted for different areas / situations where the construction of conventional pavements using hot bituminous mix or cement concrete technology is not feasible/ desirable/ economical. ICBP has many advantages as listed below: (i) No need to deploy heavy construction equipments / machineries Grameen Sampark (ii) Factory production of paving blocks facilitates centralized quality control (iii) Labour intensive construction method (iv) Instant opening of road to traffic (v) No thermal expansion and contraction of concrete (vi) Accommodates higher elastic deflections without failure (vii) Pavements are not damaged due to fuel and oil spillage (viii) High salvage value almost all blocks can be recycled / reused (ix) Least life cycle cost due to low maintenance cost (x) Environment friendly technology (xi) Can be used in poor drainage conditions
(xii) Can help in conservation of naturally occurring materials particularly the soils, gravels and aggregates Some of the proven areas where ICBP technology has been successfully applied are listed below [5&6]: a) Non-Traffic Areas: building premises, footpaths, balls, pedestrain plaza, landscapes, monuments premises, premises, public gardens/ parks, shopping complexes, bus terminus parking areas and railway platforms, etc. b) Light Traffic: car parks, office driveway, housing colony roads, office/ commercial complexes, rural roads, residential colony roads, farm houses, etc. c) Medium Traffic: boulevard, city streets, small market roads, intersections/ rotaries, low volume roads, utility cuts on arteries, service/ fuel stations, etc. d) Heavy and Very Heavy Traffic: containers/ bus terminals, ports/ dock yards, mining areas, roads in industrial complexes, heavy-duty roads on expansive soils, bulk cargo handling areas, factory floors and pavements, airport pavements, etc. There are four generic shapes of paving blocks which correspond to the four different types of blocks, as stated below [4&5]: (a) Group A: Paver blocks with plain vertical faces, which do not key into each other when paved in any pattern, (b) Group B: Paver blocks with alternating plain and curved/ corrugated vertical faces, which key into each other along the curve/ corrugated faces, when paved in any pattern, (c) Group C: Paver blocks having all faces curved or corrugated, which key into each other along all the vertical faces when paved in any pattern, and (d) Group D: 'L' and 'X' shaped paver blocks which have all faces curved or corrugated and which key Pradhan Mantri Gram Sadak Yojana into each other along all the vertical faces when paved in any pattern. The generic shapes and groups of paver blocks identified into four different types are illustrated in Figure 1. Group - A Group - B Group - C Group - D Figure 1: Typical Shapes of Concrete Paver Blocks The various aspects dealing with materials, construction and laying of interlocking concrete block pavement etc. are described in the following sections. Materials for Interlocking Concrete Block Pavement The quality of materials used, strength of cement concrete, durability and dimensional tolerance of paving blocks etc., is of great importance for achieving the satisfactory quality and performance of block pavements. All these aspects including the block manufacturing process, which immensely affect the quality of paving blocks, have been outlined in the Indian Roads Congress Special Publication [7]. In addition, a specification on Precast Concrete Blocks for Paving, has recently been published by the Bureau of Indian Standards [8]. Paving Blocks The recommended thickness of blocks; grades of concrete for various applications; specifications of Grameen Sampark 7
Page 2 and 3: In this Issue Editorial 3 Potential
Page 4 and 5: 4 Potential Applications of Interlo
Page 8 and 9: 8 materials used for production of
Page 10 and 11: 10 Construction of Sub grade This i
Page 12 and 13: 12 Typical Pavement Compositions Ty
Page 14 and 15: 14 Guidelines for the use of In
Page 16 and 17: 16 layers due to repeated applicati
Page 18 and 19: 18 Subgrade Failure Criterion The b
Page 20 and 21: 20 A maximum of 50mm rut depth was
Page 22 and 23: 22 Stabilization of Soil Subgrade w
Page 24 and 25: 24 Changes in Cohesion and Direct
Page 26 and 27: 26 Increase in the C.B.R. value is
Page 28 and 29: 28 Laboratory Test (Under Vertical
Page 30 and 31: 30 Apart from the above, both faces
Page 32: News in Brief General Body Meeting

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