Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
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213<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
(iii) The sand shall be vibrated into the joints by making three passes of the compactor.<br />
(iv) Excess sand from the top of block pavement shall be swept clean.<br />
B. <strong>Quality</strong> Control Requirements<br />
1. Material<br />
(i) Concrete paving blocks shall con<strong>for</strong>m to the relevant IS Standard.<br />
(ii) Grading <strong>for</strong> bedding and joint filling sand <strong>for</strong> interlocking concrete block pavement shall<br />
meet the requirements indicated in Table 1503.1<br />
2. The tolerance in surface levels in transverse profile shall not be more than + 10 mm.<br />
3. The maximum allowable difference between the road surface and underside of a 3 m straight<br />
edge when measured in the longitudinal profile shall not be more than 12 mm.<br />
4. The dimensions and tolerances of paving blocks shall con<strong>for</strong>m to the requirements indicated in<br />
Table 1504.1. Aspect ratio is the ratio of length to thickness of blocks. Chamfer is the beveled edge,<br />
provided on the top surface of a block. Plan area is the horizontal area bounded by the vertical<br />
faces. Wearing surface area is the horizontal area bounded by the vertical faces, minus the area<br />
reduced due to the presence of chamfer.<br />
TABLE 1504.1: DIMENSIONS AND TOLERANCES FOR PAVING BLOCKS<br />
S. No. Dimension Recommended Values Tolerance Limit<br />
1 Width W To be specified by Manufacturer + 2 mm<br />
2 Length L To be specified by Manufacturer + 2 mm<br />
3 Thickness T 60 to 80 mm + 3 mm<br />
4 Aspect Ratio L/T Maximum: 4.0 + 0.2<br />
5 Chamfer (Arris) Minimum: 5 mmMaximum: 7 mm + 1 mm<br />
6 Plan Area Maximum 0.03 sqm + 0.001 sqm<br />
7 Wearing Face Area Minimum 75% of plan area - 1 %<br />
8 Squareness NIL + 2 mm<br />
TABLE 1504.2: CORRECTION FACTORS FOR THICKNESS<br />
AND CHAMFER OF PAVING BLOCK FOR CALCULATION OF COMPRESSIVE STRENGTH.<br />
Paving Block Thickness (mm) Correction Factor <strong>for</strong><br />
Plain Block Chamfered Block<br />
60 1.00 1.06<br />
80 1.12 1.18
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