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

A uniaxial compressive stress and gas permeation technology, used in instruments, measuring devices, scientific instruments, etc., can solve the problems of cumbersome test experiments, complicated test procedures, and laborious loading and unloading, and achieve reliable test results, easy operation, and portability. Effect

Inactive Publication Date: 2006-08-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its test steps are strict and the test procedures are complicated
However, the operation of the test experiment is too cumbersome, the required equipment is huge, and the loading and unloading of the tested samples is laborious.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: The following components are connected in the manner shown in Figures 1 and 2, and those skilled in the art can implement it smoothly. The mold cover plate 1 is made of A3 steel material, and its size is 130 mm in length, 90 mm in width, and 30 mm in thickness; the diameter of the air outlet chamber 9 is 50 mm, and its depth is 18 mm; The thickness is 75mm; the diameter of the air inlet chamber 10 is 50mm, and the depth is 18mm; the width of the sealing inspection groove 6 is 4mm, and the length is 70mm; the size of the concrete sample to be tested is 70.7mm×70.7mm×40mm; the model of the air inlet valve 5 is DN10; The compressed gas tank 14 is an industrial nitrogen cylinder; the hose 16 is a vacuum rubber tube; the manometer 15 is a mercury U-shaped manometer; the jack 12 is an oil pressure 20t; the gasket 3 adopts a 3mm thick vacuum rubber gasket.

Embodiment 2

[0039] Embodiment 2: test method

[0040] Form the sample according to the mix ratio in Table 1. The size of the concrete sample is 70.7mm×70.7mm×40mm, and the test gas medium is nitrogen.

[0041] Dry the above-mentioned concrete samples that have reached the age of 28 days at 55±2°C, paste vacuum rubber gaskets with a thickness of 2mm on four sides along the thickness direction, and paste vacuum rubber gaskets with a thickness of 3mm on the two sides in the air-permeable direction , the adhesive can be made of silicone rubber, and all the corners of the concrete sample are sealed with thick white paint or silicone glue, and the treated sample is placed in a drying dish and allowed to stand at room temperature for 48 hours. The treated concrete sample is placed in the mold, pressed into the side pressure sealing wedge, tightened the connecting nut on the mold, and then placed the mold on the jack in the bracket, closely attached to the top plate and bottom of the bracket, and...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/10G01N33/38G01N13/04G06F19/00
Inventor 王中平施惠生李启令
Owner TONGJI UNIV
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