1. Q: What is the minimum compressive strength required for concrete
used in bridge decks in Louisiana? ANSWER 4,000 psi (27.6 MPa) at 28
days
2. Q: What is the standard lane width for Louisiana state highways?
ANSWER 12 feet (3.66 m)
3. Q: What is the minimum thickness for asphalt concrete surface course
on primary highways? ANSWER 1.5 inches (38 mm)
4. Q: What is the maximum allowable moisture content for subgrade soil
compaction? ANSWER Within 2% of optimum moisture content
5. Q: What is the minimum compaction requirement for embankment fill?
ANSWER 95% of Standard Proctor maximum dry density
6. Q: What is the standard superelevation rate for curves on Louisiana
highways? ANSWER Maximum 6% for rural highways, 4% for urban areas
7. Q: What is the minimum clear zone width for a 70 mph highway?
ANSWER 30 feet (9.1 m)
8. Q: What is the maximum gradient allowed for interstate highways in
Louisiana? ANSWER 5% in mountainous terrain, 4% in rolling terrain, 3% in
flat terrain
9. Q: What is the minimum radius for horizontal curves at 55 mph design
speed? ANSWER 1,020 feet (311 m)
10. Q: What is the standard depth for aggregate base course? ANSWER 6
inches (150 mm) minimum
11. Q: What is the maximum allowable deflection for bridge beams under
live load? ANSWER L/800 where L is the span length
12. Q: What is the minimum concrete cover for reinforcing steel in bridge
decks? ANSWER 2.5 inches (64 mm) top, 1 inch (25 mm) bottom
,13. Q: What is the standard width for concrete barriers on bridges?
ANSWER 2 feet (610 mm) at base
14. Q: What is the minimum design life for bridge structures in Louisiana?
ANSWER 75 years
15. Q: What is the maximum water-cement ratio for bridge deck concrete?
ANSWER 0.45
16. Q: What is the minimum curing time for concrete before form
removal? ANSWER 7 days for vertical surfaces, 14 days for horizontal load-
bearing surfaces
17. Q: What is the standard truck loading for bridge design (HL-93)?
ANSWER HS-20 truck plus lane load of 0.64 klf plus 25% impact
18. Q: What is the minimum sight distance for stopping on a 65 mph
highway? ANSWER 645 feet (197 m)
19. Q: What is the maximum allowable settlement for bridge foundations?
ANSWER 1 inch (25 mm) total, 0.5 inch (13 mm) differential
20. Q: What is the standard crown for concrete pavements? ANSWER 1/8
inch per foot (1.04%) from centerline to edge
21. Q: What is the minimum temperature for asphalt paving operations?
ANSWER 40°F (4°C) ambient temperature
22. Q: What is the maximum lift thickness for asphalt concrete placement?
ANSWER 4 inches (100 mm) before compaction
23. Q: What is the minimum overlap for longitudinal construction joints in
asphalt? ANSWER 6 inches (150 mm)
24. Q: What is the standard testing frequency for concrete cylinder breaks?
ANSWER One set per 150 cubic yards or per day of placement
25. Q: What is the minimum age of aggregate stockpiles before use?
ANSWER 48 hours after final placement
26. Q: What is the maximum allowable air content in concrete? ANSWER
6% ± 1.5% for normal exposure
27. Q: What is the minimum width for construction work zones?
ANSWER 12 feet (3.66 m) for through traffic
28. Q: What is the standard height for guardrail installation? ANSWER 31
inches (787 mm) from ground to top of rail
, 29. Q: What is the minimum depth for driven piles in bridge foundations?
ANSWER 20 feet (6.1 m) or to bearing stratum
30. Q: What is the maximum allowable chloride content in concrete mix?
ANSWER 0.15% by weight of cement for reinforced concrete
31. Q: What is the standard frequency for nuclear density testing?
ANSWER Every 500 square yards (418 m²) or as specified
32. Q: What is the minimum temperature for concrete placement?
ANSWER 40°F (4°C) and rising
33. Q: What is the maximum time between concrete mixing and
placement? ANSWER 90 minutes or before initial set
34. Q: What is the standard slope for cut sections in clay soil? ANSWER
1:1 (45 degrees) maximum
35. Q: What is the minimum width for median strips on divided highways?
ANSWER 4 feet (1.2 m) for urban, 26 feet (7.9 m) for rural
36. Q: What is the maximum allowable void ratio in compacted aggregate
base? ANSWER 8% maximum
37. Q: What is the standard frequency for soil density testing? ANSWER
Every 2,000 square feet (186 m²) per lift
38. Q: What is the minimum clearance height for highway overpasses?
ANSWER 16 feet (4.9 m) on interstates, 14 feet (4.3 m) on other routes
39. Q: What is the maximum allowable deviation from design grade?
ANSWER ±0.02 feet (±6 mm) for pavement surfaces
40. Q: What is the standard width for highway shoulders? ANSWER 8 feet
(2.4 m) for rural interstates, 4 feet (1.2 m) for other highways
41. Q: What is the minimum reinforcement ratio for concrete bridge
decks? ANSWER 0.6% of gross concrete area each direction
42. Q: What is the maximum allowable crack width in concrete structures?
ANSWER 0.007 inches (0.18 mm) for severe exposure
43. Q: What is the standard testing temperature for asphalt binder?
ANSWER 77°F (25°C) for penetration testing
44. Q: What is the minimum spacing between expansion joints in concrete
pavements? ANSWER 15 feet (4.6 m) for unreinforced concrete
used in bridge decks in Louisiana? ANSWER 4,000 psi (27.6 MPa) at 28
days
2. Q: What is the standard lane width for Louisiana state highways?
ANSWER 12 feet (3.66 m)
3. Q: What is the minimum thickness for asphalt concrete surface course
on primary highways? ANSWER 1.5 inches (38 mm)
4. Q: What is the maximum allowable moisture content for subgrade soil
compaction? ANSWER Within 2% of optimum moisture content
5. Q: What is the minimum compaction requirement for embankment fill?
ANSWER 95% of Standard Proctor maximum dry density
6. Q: What is the standard superelevation rate for curves on Louisiana
highways? ANSWER Maximum 6% for rural highways, 4% for urban areas
7. Q: What is the minimum clear zone width for a 70 mph highway?
ANSWER 30 feet (9.1 m)
8. Q: What is the maximum gradient allowed for interstate highways in
Louisiana? ANSWER 5% in mountainous terrain, 4% in rolling terrain, 3% in
flat terrain
9. Q: What is the minimum radius for horizontal curves at 55 mph design
speed? ANSWER 1,020 feet (311 m)
10. Q: What is the standard depth for aggregate base course? ANSWER 6
inches (150 mm) minimum
11. Q: What is the maximum allowable deflection for bridge beams under
live load? ANSWER L/800 where L is the span length
12. Q: What is the minimum concrete cover for reinforcing steel in bridge
decks? ANSWER 2.5 inches (64 mm) top, 1 inch (25 mm) bottom
,13. Q: What is the standard width for concrete barriers on bridges?
ANSWER 2 feet (610 mm) at base
14. Q: What is the minimum design life for bridge structures in Louisiana?
ANSWER 75 years
15. Q: What is the maximum water-cement ratio for bridge deck concrete?
ANSWER 0.45
16. Q: What is the minimum curing time for concrete before form
removal? ANSWER 7 days for vertical surfaces, 14 days for horizontal load-
bearing surfaces
17. Q: What is the standard truck loading for bridge design (HL-93)?
ANSWER HS-20 truck plus lane load of 0.64 klf plus 25% impact
18. Q: What is the minimum sight distance for stopping on a 65 mph
highway? ANSWER 645 feet (197 m)
19. Q: What is the maximum allowable settlement for bridge foundations?
ANSWER 1 inch (25 mm) total, 0.5 inch (13 mm) differential
20. Q: What is the standard crown for concrete pavements? ANSWER 1/8
inch per foot (1.04%) from centerline to edge
21. Q: What is the minimum temperature for asphalt paving operations?
ANSWER 40°F (4°C) ambient temperature
22. Q: What is the maximum lift thickness for asphalt concrete placement?
ANSWER 4 inches (100 mm) before compaction
23. Q: What is the minimum overlap for longitudinal construction joints in
asphalt? ANSWER 6 inches (150 mm)
24. Q: What is the standard testing frequency for concrete cylinder breaks?
ANSWER One set per 150 cubic yards or per day of placement
25. Q: What is the minimum age of aggregate stockpiles before use?
ANSWER 48 hours after final placement
26. Q: What is the maximum allowable air content in concrete? ANSWER
6% ± 1.5% for normal exposure
27. Q: What is the minimum width for construction work zones?
ANSWER 12 feet (3.66 m) for through traffic
28. Q: What is the standard height for guardrail installation? ANSWER 31
inches (787 mm) from ground to top of rail
, 29. Q: What is the minimum depth for driven piles in bridge foundations?
ANSWER 20 feet (6.1 m) or to bearing stratum
30. Q: What is the maximum allowable chloride content in concrete mix?
ANSWER 0.15% by weight of cement for reinforced concrete
31. Q: What is the standard frequency for nuclear density testing?
ANSWER Every 500 square yards (418 m²) or as specified
32. Q: What is the minimum temperature for concrete placement?
ANSWER 40°F (4°C) and rising
33. Q: What is the maximum time between concrete mixing and
placement? ANSWER 90 minutes or before initial set
34. Q: What is the standard slope for cut sections in clay soil? ANSWER
1:1 (45 degrees) maximum
35. Q: What is the minimum width for median strips on divided highways?
ANSWER 4 feet (1.2 m) for urban, 26 feet (7.9 m) for rural
36. Q: What is the maximum allowable void ratio in compacted aggregate
base? ANSWER 8% maximum
37. Q: What is the standard frequency for soil density testing? ANSWER
Every 2,000 square feet (186 m²) per lift
38. Q: What is the minimum clearance height for highway overpasses?
ANSWER 16 feet (4.9 m) on interstates, 14 feet (4.3 m) on other routes
39. Q: What is the maximum allowable deviation from design grade?
ANSWER ±0.02 feet (±6 mm) for pavement surfaces
40. Q: What is the standard width for highway shoulders? ANSWER 8 feet
(2.4 m) for rural interstates, 4 feet (1.2 m) for other highways
41. Q: What is the minimum reinforcement ratio for concrete bridge
decks? ANSWER 0.6% of gross concrete area each direction
42. Q: What is the maximum allowable crack width in concrete structures?
ANSWER 0.007 inches (0.18 mm) for severe exposure
43. Q: What is the standard testing temperature for asphalt binder?
ANSWER 77°F (25°C) for penetration testing
44. Q: What is the minimum spacing between expansion joints in concrete
pavements? ANSWER 15 feet (4.6 m) for unreinforced concrete
