Concrete body and test instrument thereof and method for permeation performance with other medium bonding surface

Abstract

The invention discloses a concrete body and a tester for the permeability at the adhesive face between the concrete body and other mediums. The concrete body comprises a bearing tube with an open end, wherein the bearing tube is provided with a water inlet; the bottom middle of the bearing tube is provided with an observation hole; the mouth of the bearing tube is provided with a bearing ring; a sealing device is provided between the bearing ring and the inner wall of the bearing tube; the top of the bearing ring is provided with a jack. The invention can change water pressure according to the actual water pressure on concrete, thus being suitable for testing the permeability of concrete under special water pressure and axial pressure. The invention can test the long-time permeability resistance of concrete with high performance and low permeability, without the limitation on water pressure and time, and can calculate anti-permeability number according to the method regulated by general concrete long-term performance and durability test method, or calculate permeability coefficient according to the method regulated by hydraulic concrete test rule, and can compare the permeability result with the permeability of other high-performance concrete tested by other methods.

Description

technical field [0001] The invention belongs to the technical field of the durability of high-performance concrete on the shaft wall and the durability of other high-performance concrete materials in well-sinking engineering by freezing method, and specifically relates to a tester for the permeability of a concrete body or a bonding surface between concrete and other media under uniaxial compressive stress and testing method. Background technique [0002] my country's concrete permeability standards mainly use water to evaluate the permeability of concrete, namely "impermeability labeling method", "permeability coefficient method" and "water seepage height method". [0003] "Ordinary Concrete Long-Term Performance and Durability Test Method" (GBJ82-85) stipulates that the test starts from 0.1MPa, and the water pressure is increased by 0.1MPa every 8h until 3 of the 6 test pieces have water seepage on the end faces. Stop the test, record the water pressure and calculate the ...

AI Technical Summary

Problems solved by technology

Therefore, very few scholars use pressure testing machines or specially designed hydraulic servo equipment to conduct permeability tests of concrete under pressure loads, but the time for such machines to maintain pressure is limited, and they are greatly affected by factors such as power outages, so Most of the tests in this area are for air or chloride ion penetration tests that can be completed in a short period of time, even water penetration tests often only last for a few hours before ending

However, it is well known that the penetration of water in cement-based materials such as concrete is a changing process, and the permeability will change with the increase of the penetration time, so the water penetration test usually needs to last for a long time; concrete as a building structure material , must work in a certain state of loading. The testing instruments specified in the existing codes can only test the permeability of concrete in an unstressed state, and the water pressure used for penetration is small. For high-performance, low-permeability concrete , the test method has the disadvantage of large error

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