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Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

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B. <strong>Quality</strong> Control Requirements<br />

1. Material<br />

(a) Flyash (Pond Ash):<br />

37<br />

<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />

Particle size analysis, Maximum Dry Density and Optimum Moisture Content as per IS:2720 (Part-<br />

7), Graph of dry density plotted against moisture content <strong>for</strong> this test shall be submitted <strong>for</strong> approval<br />

of Engineer, be<strong>for</strong>e execution of work.<br />

(b) Soil:<br />

Soil <strong>for</strong> cover to the flyash embankment shall satisfy the requirements of a suitable material <strong>for</strong><br />

embankment construction as per sub-section 301.<br />

(c) Sub-grade:<br />

Sub-grade shall con<strong>for</strong>m to the requirements of sub-section 303.<br />

2. <strong>Quality</strong> control tests and their frequency shall be as indicated in Table 301.4 to 301.5.<br />

C Do’s and Don’ts<br />

1. Check the placement moisture content of fill material<br />

which should be within (±) 2% of the OMC.<br />

2. Place subsequent layer only after finished layer has<br />

been tested <strong>for</strong> density requirements and duly<br />

approved by the Engineer.<br />

3. Remove the material in soft areas where requisite<br />

density requirements have not been achieved and<br />

replace the same by approved material, bring<br />

moisture content to permissible limits and recompact<br />

to the required density.<br />

4. Do transportation of fly-ash, normally at night.<br />

307. SURFACE DRAINS<br />

A. Methodology<br />

Do’s Don’ts<br />

1. Do not allow addition of side cover subsequent to the<br />

construction of the flyash core.<br />

2. Do not allow traffic in areas where flyash is temporarily<br />

stockpiled and kept moist to avoid dusting.<br />

3. Do not allow construction traffic or other vehicular<br />

traffic directly over the prepared surface of<br />

embankment/ sub-grade.<br />

1. Ensure that the surface drains/roadside ditches are provided strictly according to the Drainage<br />

Plan <strong>for</strong> the road.<br />

2. Excavate to the specified lines, grades, levels and dimensions.<br />

3. Remove all excavated material from the area adjoining the drains. If the excavated material is<br />

found suitable, utilize in embankment/sub-grade construction, otherwise dispose of the material<br />

away from the road site.<br />

4. Ensure that the excavated bed and sides of the drains are in con<strong>for</strong>mity with the specified<br />

dimensions, levels and slopes.

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