Item 505
Riprap and Grouted Riprap Quiz
Test your knowledge on riprap and grouted riprap specifications with our engaging quiz! This quiz includes questions on various classes of stone, installation techniques, and standards essential for construction professionals.
Key features of the quiz:
- 10 multiple-choice questions
- Instant feedback on your answers
- Explore important terms and definitions
A class of stone intended for riprap ranging from a minimum of 15 kg to a maximum of 25 kg., with at least 50 percent of the stones weighing more than 20 kg.
Class A
Class B
Class C
Class D
€‹A class of stone intended for riprap ranging from a minimum of 60 kg to a maximum of 100 kg with at least 50 percent of the stones weighing more than 80 kg.
Class A
Class B
Class C
Class D
€‹It shall be placed horizontally at the lowest points where free outlets for water can be obtained and shall be spaced at not more than 2 m center to center in a staggered manner.
Weepholes
Filter Cloth
Drain Pipe
Drainage Canal
Minimum thickness of Riprap Class D
300 mm
500 mm
600 mm
800 mm
Minimum diameter of PVC weepholes
25 mm
50 mm
75 mm
100 mm
Minimum thickness of Riprap Class B
300 mm
500 mm
800 mm
900 mm
Minimum density of recycled broken concrete that can be used as an alternative for stones in the construction of riprap
2425 kg/m3
2254 kg/m3
2245 kg/m3
2542 kg/m3
The minimum length of the weepholes shall be greater than or equal to
Length of the riprap
€‹height of the riprap​​​​
Depending on the type of pipe
Thickness of the riprap
Item of Work for Riprap and Grouted Riprap under Volume II and Volume III
505, 1710
506, 1710
505, 1711
506, 1711
Unit of Measurement for the Basis of Payment of Item 505 – Riprap and Grouted Riprap
Square meter
Lump sum
Linear meter
Cubic meter
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