Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

207
Quality Assurance Handbook for Rural Roads
TABLE 1502.5: QUALITY CONTROL TESTS DURING CONSTRUCTION
S. No. Tests/ Check Frequency
1. Gradation and moisture content of aggregates As in Table 1501.3
2. Batching and mixing of materials Check for measurements and proper mixing
3. Workability, zero slump and insitu density of RCCP One test for 3 cum of concrete
4. Insitu density of trial length by sand replacement method
IS:2720)
Three tests for each 2000 sq m or part thereof.
5. Subgrade and Subbase As in Table 301.5 and 401.3
6. Strength of Concrete (IS:516) As in Table 1501.3
7. Side forms As in Table 1501.3
8. Transverse Contraction Joints (width and depth) 18-24 hours after laying
2.3 Quality Control Checks by AE / EE
The Quality Control checks to be carried out by AE / EE are indicted in Table 1502.6
TABLE 1502.6: QUALITY CONTROL CHECKS BY AE/EE
S. No. Tests/ Check Frequency Designation of
Inspecting Officer
1. Thickness, levels and strength Three sections at the end of work AE / EE
At random
2. Cumulative length of cracks One check for every 100 m length. AE / EE
3. Core density of RCCP and At the end of 28 days AE/EE
homogeneity (Average of three cores)
4. Performance of 30 m Trial length For each work AE/EE
C. Do’s and Don’ts
Do’s Don’ts
1. Determine optimum moisture content requirement
after making field trial construction.
2. Do ensure uniform spreading of concrete to ensure
uniform density, proper compaction and
achievement of designed thickness.
3. Do taper concrete in half a metre length at the end of
day’s work. Before commencement of work on the
next day, this half metre width should be cut straight
and fresh concrete abutting the old concrete is laid.
4. Commence rolling from lower edges to center/
super-elevated edges.
5 Ensure sufficiency and accuracy of material, plant
and equipment and methods of construction by
laying a trial length.
6. Use flexible synthetic or jute rope to avoid infiltration
of foreign particles/dust in empty joints.
1. Do not lay sub-base on a sub-grade softened by rain.
2. Do not allow normal working till the trial length has
been approved.
3. Do not provide any vertical step between the adjacent
side forms greater than 3 mm.
4. Do not make up depressions, while placing RCCP, by
depositing fine material.
5. Do not use flyash as replacement of cement if Portland
Pozzolana flyash based or any other blended cement
is used.
6. Do not allow any traffic, including construction
vehicles on the finished surface of concrete pavement
till the joints are permanently sealed.