Test method for anti-permeability performance of fluid sealant and concrete bonding sample interface

A technology of bonding samples and testing methods, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve problems such as bad social impact, foundation subsidence, and damage to concrete structures, and achieve easy promotion, convenient use, and operation simple effect

Inactive Publication Date: 2009-07-15
NORTHWEST A & F UNIV
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AI Technical Summary

Problems solved by technology

Poorly treated joints become channels for water seepage, directly or indirectly destroying the concrete structure or the foundation of the project, causing foundation s

Method used

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  • Test method for anti-permeability performance of fluid sealant and concrete bonding sample interface

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Embodiment Construction

[0013] see figure 1 According to the technical scheme of the present invention, the test method of the interface impermeability of the sealant and the concrete bonding sample comprises the following steps:

[0014] 1. First, prepare a bonded anti-seepage sample. The concrete anti-seepage sample is in the shape of a truncated cone, with a large bottom and a small top as a whole. It is made of concrete 3 and sealant 1. Sealant 1 is located in the middle of concrete 3, and It is completely covered by the concrete 3 and forms a whole with the concrete 3, and the anti-seepage layer is applied around the bottom and outside of the concrete part of the impermeable sample;

[0015] 2. Place the bonded anti-seepage sample in the outer steel mold 2, and fix it on the water pressure chamber 7 of the anti-seepage instrument 6 through the rubber washer 4 with fastening bolts 5, so that the bonded anti-seepage sample and the anti-seepage instrument The water pressure chamber 7 of 6 is imper...

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Abstract

The invention discloses a method for testing interface impervious strength of the sample bonded by sealant and concrete. The method comprises: reserving a seam cavity of a certain size in the middle of the concrete bonded sample, filling in sealant to bond the concrete and the sealant into an integral body to obtain a truncated cone shaped bonded impervious sample; placing the bonded impervious sample on the permeability instrument; increasing the water pressure of the impervious instrument at regular intervals for 0.1MPa each time from 0.1MPa until water seeps from the sample surface; and determining the previous water pressure as the impervious strength of the interface of concrete and sealant. The invention achieves the advantages of simple operation, unique and convenient using, need not adding other equipments, is convenient for popularization; it can detect the impervious strength of any composite material structure, has good instructiveness to engineering practice, is especially suitable for detecting the impervious strength of concrete construction seam and expansion joint such as simulated reservoir dam surface, channel expansion joint, aqueduct expansion joint and pipeline expansion joint, achieves great practical engineering value.

Description

technical field [0001] The invention belongs to the field of performance testing of building materials, in particular to a method for testing the interface impermeability of a sealant and a concrete bonding sample. Background technique [0002] At present, the method of testing the impermeability of concrete is very mature. At the same time, the sealant as an anti-seepage sealing material does not need to be tested for its impermeability because of its high impermeability level. However, when the sealant is used as a caulking or joint material in concrete construction joints or expansion joints, the bonding interface is often the weakest part of the impermeability. The bonding surface is composed of inorganic materials and polymer materials. First of all, the porosity, void type, roughness of the concrete surface, and the type, ratio, and viscosity of the polymer sealant all affect the bond strength; in addition, the cleanliness, roughness, dry humidity, and application of ...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 张慧莉何武全田堪良娄宗科姚汝方
Owner NORTHWEST A & F UNIV
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