Pressure Test of Prefabricated Floor Slabs in Houses
The pressure test of prefabricated floor slabs in houses mainly involves the specifications for retaining test blocks, pressure test methods, and pressure intensity test methods.
Specifications for Retaining Test Blocks: Test blocks are a crucial means of concrete quality control. During the production of prefabricated floor slabs in houses, to ensure that the concrete strength meets the design standards, test blocks must be retained as specified. Generally, at least one set of test blocks should be retained for every 100 cubic meters of concrete poured. These test blocks are made using the same concrete mix ratio as the prefabricated floor slabs and are cured under the same conditions. By testing the strength of the test blocks, the strength of the concrete used in the prefabricated floor slabs can be indirectly reflected, providing an important basis for project quality.
Pressure Test Methods: This is a destructive test conducted on the construction site. Usually, the quality inspection department of the construction committee randomly selects one prefabricated slab for inspection on the construction site. During the test, the prefabricated slab is first placed on brick platforms built at both ends to simulate its support state in actual use. Then, a certain number of bricks are placed on the prefabricated slab, and the weight is gradually increased for the destructive test. At the same time, instruments are placed under the slab to monitor its stress situation in real-time. When the prefabricated slab can withstand the specified pressure without breaking, it is judged as qualified. This method can visually inspect the load-bearing capacity of the prefabricated slab in the actual use environment.
Pressure Intensity Test Methods: First, prepare a prefabricated slab sample and accurately measure and mark its dimensions and shape. The sample size is usually 150mm x 150mm x 150mm, which is convenient for operation and testing in the test instrument. Then, place the sample in the test instrument, such as a compression bar testing machine or a universal testing machine. During the test, gradually increase the pressure until the sample breaks. During this process, detailed records of data such as the maximum load-bearing capacity and breaking pressure of the sample should be made. These data are an important basis for evaluating the strength of the prefabricated slab, helping engineers understand its mechanical properties and determine whether it meets the design requirements.
