PAVERS BLOCK AND BRICKS MANUFACTURING PLANT
[CODE NO.4301]
Interlocking Concrete Block Pavement (ICBP) has been extensively used in a number of countries for quite some time as a specialized problem-solving technique for providing pavement in areas where conventional types of construction are less durable due to many operational and environmental constraints. ICBP technology has been introduced in India in construction, a decade ago, for specific requirement viz. footpaths, parking areas etc. but now being adopted extensively in different uses where the conventional construction of pavement using hot bituminous mix or cement concrete technology is not feasible or desirable. The paper dwells upon material, construction and laying of concrete block pavement as a new approach in construction of pavement using Interlocking Concrete Paver Blocks.
Concrete paver blocks were first introduced in Holland in the fifties as replacement of paver bricks which had become scarce due to the post-war building construction boom. These blocks were rectangular in shape and had more or less the same size as the bricks. During the past five decades, the block shape has steadily evolved from non-interlocking to partially interlocking to fully interlocking to multiply interlocking shapes. Consequently, the pavements in which non-interlocking blocks are used are designated as Concrete Block Pavement (CBP) or non-interlocking CBP, and those in which partially, fully or multiply interlocking blocks are used are designated as 'Interlocking Concrete Block Pavement (ICBP).
CBP/ICBP consists of a surface layer of small-element, solid un-reinforced pre-cast concrete paver blocks laid on a thin, compacted bedding material which is constructed over a properly profiled base course and is bounded by edge restraints/kerb stones. The block joints are filled using suitable fine material. A properly designed and constructed CBP/ICBP gives excellent performance when applied at locations where conventional systems have lower service life due to a number of geological, traffic, environmental and operational constraints [1-8]. Many number of such applications for light, medium, heavy and very heavy traffic conditions are currently in practice around the world.
Advantages and Limitations
There are many distinct features of ICBP as compared to the conventional methods of pavement construction and hence make it a suitable option for application in the specified areas [7 & 10]. Some of these are:
• Mass production under factory conditions ensures availability of blocks having consistent quality and high dimensional accuracy.
• Good quality of blocks ensures durability of pavements, when constructed to specifications.
• ICBP tolerates higher deflections without structural failure and will not be affected by thermal expansion or contraction.
• ICBP does not require curing, and so can be opened for traffic immediately after construction.
• Construction of ICBP is labor intensive and requires less sophisticated equipment.
• The system provides ready access to underground utilities without damage to pavement.
• Maintenance of ICBP is easy and simple and it is not affected by fuel and oil spillage.
• Use of coloured blocks facilitates permanent traffic markings.
• ICBP is resistant to punching loads and horizontal shear forces caused by maneuvering of heavy vehicles
• Low maintenance cost and a high salvage value ensures low life cycle cost.
However, important limitations of the technique are the following:
• Quality control of blocks at the factory premises is a prerequisite for durable "ICBP"
• Any deviations of base course profile will be reflected on the "ICBP" surface. Hence extra care needs to be taken to fix the same.
• High quality and gradation of coarse bedding sand and joint filling material are essential for good performance.
• "ICBP" over unbound granular base course is susceptible to the adverse effects of poor drainage and will deteriorate faster. "ICBP" is not suited for high speed roads (speed above 60 km/h)
Physical Requirements
Since zero slump concrete is used in production of paver blocks, the quality of blocks produced will depend upon various parameters like the capacity of compaction and vibration of machine, grade of cement used, water content, quality of aggregates used, their gradation and mix design adopted, additives used, handling equipment employed, curing method adopted, level of supervision, workmanship and quality control achieved, etc. Recommended grades of paver blocks to be used for construction of pavements having different traffic categories are given in Table 1.
Application of ICBP Technology
Some of the proven areas where ICBP technology is being applied are listed below:
Non-traffic Areas: Building Premises, Footpaths, Malls, Pedestrian Plaza, Landscapes, Monuments Premises, Premises, Public Gardens/Parks, Shopping Complexes, Bus Terminus Parking areas and Railway Platform, etc.
Light Traffic: Car Parks, Office Driveway, Housing Colony Roads, Office/Commercial Complexes, Rural Roads, Residential Colony Roads, Farm Houses, etc.
Medium Traffic: Boulevard, City Streets, Small Market Roads, Intersections/Rotaries on Low Volume Roads, Utility Cuts on Arteries, Service Stations, etc.
Heavy and Very Heavy Traffic: Container/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 Pavement, etc.
Shapes and Classifications
There are four generic shapes of paver blocks corresponding to the four types of blocks as below:
Type A: Paver blocks with plain vertical faces, which do not key into each other when paved in any pattern,
Type 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,
Type 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
Type D: 'L' and 'X' shaped paver blocks which have all faces curved or corrugated and which key into each other along all the vertical faces when paved in any pattern.
The generic shapes and groups of paver blocks identified to four types are illustrated in Figures 1 & 2.
Materials
The quality of materials, cement concrete strength, durability and dimensional tolerance of paving blocks, etc. is of great importance for the satisfactory performance of block pavements. These aspects and the block manufacturing process itself, which immensely affect the quality of paving blocks, have been outlined in the Indian Roads Congress Special Publications. The Central Road Research Institute (CRRI) has prepared the specifications for ICBP.
Paving Blocks
The quality of materials, strength of cement concrete and durability as well as dimensional tolerances etc. are of great importance for satisfactory performance of block pavement. The recommended thickness of block and grades of concrete for various applications and specification for paving in which materials used for preparation of blocks, physical requirements, physical test methods, sampling and acceptance criteria has already been formulated in BIS Code.
COST ESTIMATION
Plant Capacity 14,000 Nos/Day
Land & Building (4000 sq.mt.) Rs. 15 Lac
Plant & Machinery Rs. 46 Lac
Working Capital for 1 Month Rs. 24 Lac
Total Capital Investment Rs. 92 Lac
Rate of Return 45%
Break Even Point 64%
APPENDIX – A:
01. PLANT ECONOMICS
02. LAND & BUILDING
03. PLANT AND MACHINERY
04. OTHER FIXED ASSESTS
05. FIXED CAPITAL
06. RAW MATERIAL
07. SALARY AND WAGES
08. UTILITIES AND OVERHEADS
09. TOTAL WORKING CAPITAL
10. TOTAL CAPITAL INVESTMENT
11. COST OF PRODUCTION
12. TURN OVER/ANNUM
13. BREAK EVEN POINT
14. RESOURCES FOR FINANCE
15. INSTALMENT PAYABLE IN 5 YEARS
16. DEPRECIATION CHART FOR 5 YEARS
17. PROFIT ANALYSIS FOR 5 YEARS
18. PROJECTED BALANCE SHEET FOR (5 YEARS)
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