Test Background
One of the main indicators of concrete quality is compressive strength. From the concrete strength expression, it is easy to see that the compressive strength of concrete is proportional to the strength of the cement used in concrete. Calculated according to the formula, when the water-cement ratio is equal, the compressive strength of concrete prepared with high-grade cement is much higher than that of low-grade cement. The concrete compressive strength test for concrete pipes determines the compressive strength of concrete for concrete pipes.
The concrete compressive strength of the prestressed concrete water pipe body of different pipe-making processes is equal to the cubic concrete compressive strength multiplied by the process conversion factor.
Zhongke Testing Reliability Experiment Center has the capability to test the reliability performance of various types of concrete for concrete pipes, and provides professional compressive strength testing services for concrete for concrete pipes.
Scope of tests
Concrete for prestressed concrete pipes, prestressed steel cylinder concrete pipes, concrete and reinforced concrete drainage pipes.
Test method
1. Use the side surface during molding as the upper and lower pressure-bearing surfaces. Place the specimen securely on the lower pressure plate, align the geometric centers of the upper and lower pressure plates, and start the testing machine. When the upper pressure plate is close to the surface of the specimen, adjust the spherical seat to balance the contact.
2. Load continuously and evenly at a loading rate of 0.5 MPa/s~0.8 MPa/s (higher concrete strength levels require higher loading rates) until the specimen is damaged, and record the damage load.
Test standard:
GB/T 11837-2009 Test method for compressive strength of concrete for concrete pipes
GB/T 2611 General technical requirements for testing machines
GB/T 3159 hydraulic universal testing machine
GB 5696 Prestressed concrete pipe
GB/T 11836 Concrete and reinforced concrete drainage pipes
GB/T 19685 Prestressed steel cylinder concrete pipe
GB/T 50081-2002 Test method standard for mechanical properties of ordinary concrete
GBJ 107 concrete strength inspection and evaluation standard
JG 3019 concrete trial mold
JG/T 3020 vibration table for concrete laboratory
