IS 3597 outlines the standard procedures for testing precast concrete pipes, including reinforced and prestressed varieties. It defines the methodologies for the hydrostatic pressure test, three-edge bearing load test, and water absorption test to ensure pipes meet the performance standards specified in IS 458.
Concrete pipes - Methods of test
Quick Reference Values
absorption drying temperature105°C to 115°C
absorption boiling duration5 hours
weighing accuracy absorption0.1 percent of test piece mass
load measurement accuracy± 2 percent
Key Formulas
Water Absorption (%) = [(B - A) / A] x 100, where A = mass of oven-dried specimen, B = mass of boiled and cooled specimen
Practical Notes
During the three-edge bearing test, the load must be applied continuously and uniformly without shock to accurately determine the cracking and ultimate crushing loads.
For the hydrostatic test, it is crucial to bleed all entrapped air from the pipe before fully pressurizing to prevent safety hazards and false pressure readings.
Absorption test specimens must be taken from pipes that have completed their standard curing period and should ideally span the full thickness of the pipe wall.