Detecting instrument for concrete gas seepage coefficient under single-shaft-pressure stress and detecting method

Abstract

Said invention refers to concrete gaseous permeability coefficient uniaxial compressive stress tester and testing method belonging to concrete material viability detection technique field. It contains dying, dying sample room, supporting frame, lifting jack, pressurizing plate, compressed gas tank, and pressure gauge etc, wherein dying consisting of dying cover board and dying bottom case, dying sample room located in dying bottom case, dying cover board and dying bottom case respectively set with outgoing gas chamber, intake chamber in turn connected with inlet valve, compressed gas, and pressure gauge, lifting jack and pressurizing respectively located at two ends of test sample, one side of dying bottom case set leakage check groove. In testing, tested sample is located in dying sample room, pressing in wedge, screwing dying, checking leak tightness, starting up lifting jack, applying compressive stress in test sample, opening compressed gas tank valve, keeping tested sample equilibration time being 10-20 minute, each tested sample repeating testing gas permeation time by more than 3-5 times, changing test pressure and repeat testing, to obtain tested sample permeability coefficient average value, taking 3-5 tested sample permeability coefficient average value as test value of said group tested sample. Said invention has easy and simple to handle, reliable test result, assembly type unit, and convenient for carrying.

Description

technical field

[0001] The invention belongs to the technical field of durability detection of concrete materials, and in particular relates to a concrete gas permeability coefficient tester under uniaxial compressive stress and a test method thereof. Background technique

[0002] Concrete, as a building structure material, must work under certain load conditions. Existing testing instruments can only test the performance of concrete under stress-free conditions. The development of instruments that can test the performance indicators of concrete under stress is an important task in academia and engineering. common goal of the world.

[0003] At present, the permeability coefficient test methods using gas as the test medium mainly include the Figg method and the Cembureau method.

[0004] The Figg method is a semi-destructive method for measuring the compactness of concrete. A small hole of 10mm is drilled on the concrete surface with a depth of about 40mm. After removing th...

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