阅读说明：本技术 混凝土抗渗性检测的方法 (Method for detecting concrete impermeability ) 是由 牟永利 于 2020-08-07 设计创作，主要内容包括：本发明涉及混凝土指标检测的技术领域,特别是涉及混凝土抗渗性检测的方法,以解决现有技术中试模与试件之间发生漏水的现象,提高工作效率；包括以下步骤：S1、制作试件模具；S2、试件制作；S3、成型后,将试件以及试件模具放置到烘箱内部,进行加热,使固体状密封料材料融化,然后进行降温,降至常温使融化的固体状密封料材料重新固化；S4、拆掉试件模具,取出带有密封材料的试件；S5、将试件靠近试件模具一端切除一部分,并打磨光滑；S6、通过螺旋加压器经过烘箱或电炉预热过的试模中,使试件底面和试模底平齐,待试模冷却后,解除压力；S7、装载在渗透仪上进行试验。(The invention relates to the technical field of concrete index detection, in particular to a method for detecting concrete impermeability, which aims to solve the problem that water leakage occurs between a test die and a test piece in the prior art and improve the working efficiency; the method comprises the following steps: s1, manufacturing a test piece mold; s2, manufacturing a test piece; s3, after molding, placing the test piece and the test piece mold in an oven, heating to melt the solid sealing material, cooling to normal temperature to re-solidify the melted solid sealing material; s4, removing the test piece die, and taking out the test piece with the sealing material; s5, cutting off a part of one end of the test piece close to the test piece mold, and polishing the test piece mold smoothly; s6, passing the test piece through a test mould preheated by an oven or an electric furnace through a spiral pressurizer to enable the bottom surface of the test piece and the bottom of the test mould to be flush, and releasing pressure after the test mould is cooled; and S7, loading the membrane on a permeameter for testing.)

1. The method for detecting the impermeability of concrete is characterized by comprising the following steps:

s1, manufacturing a test piece mold: the test piece mold is hollow and is provided with an opening at the top, and annular solid sealing materials are placed on the inner wall of the test piece mold;

s2, manufacturing a test piece: uniformly mixing raw materials of concrete with water, putting the mixed materials into a test piece mold, and standing for molding;

s3, after molding, placing the test piece and the test piece mold in an oven, heating to melt the solid sealing material, cooling to normal temperature to re-solidify the melted solid sealing material;

s4, removing the test piece die, and taking out the test piece with the sealing material;

s5, cutting off a part of one end of the test piece close to the test piece mold, and polishing the test piece mold smoothly;

s6, passing the test piece through a test mould preheated by an oven or an electric furnace through a spiral pressurizer to enable the bottom surface of the test piece and the bottom of the test mould to be flush, and releasing pressure after the test mould is cooled;

and S7, loading the membrane on a permeameter for testing.

2. The method for testing impermeability of concrete according to claim 1, wherein a release agent is sprayed between the inner wall of the test piece mold and the solid sealing material in step S1.

3. The method for testing impermeability of concrete according to claim 2, wherein the solid sealing material in step S1 is paraffin and rosin, and the mass of paraffin is: the mass of the rosin is 100: 2-7.

4. The method for detecting impermeability of concrete according to claim 3, wherein the heating manner in step S3 is hair dryer heating, heating to 45 ℃ at a rate of 5 ℃ per minute, keeping the temperature for 20 minutes, then heating to 80 ℃ at a rate of 5 ℃ per minute, and keeping the temperature for 30 minutes.

5. The method for testing impermeability of concrete according to claim 4, wherein in step S5, a portion of the test piece is cut off at the end close to the test piece mold, so that the test piece can be completely placed in the test mold and the cut end face of the test piece does not detect the sealing material.

6. The method for testing impermeability of concrete according to claim 5, wherein the grinding in step S5 is performed by using a wire brush.

7. The method for testing impermeability of concrete according to claim 6, wherein the step S7 includes the following steps: the water pressure is increased by 0.1MPa from 0.1MPa every 8h, the end surface condition of the test piece is observed at any time until water seepage appears on the surfaces of 3 test pieces in 6 test pieces, and the water seepage pressure at the moment is recorded, so that the test can be stopped;

when the pressure is increased to the designed anti-permeability grade, the third test piece still does not seep water after 8 hours, which indicates that the concrete meets the design requirements, and the test can be stopped;

after the test is finished, the test mold of the impervious test piece is timely removed, the test piece is placed on a press machine, the test piece is split into two halves along the longitudinal section, after the water mark is seen clearly (about 2-3 min), the ink is used for tracing the water mark, and the handwriting is not too thick;

the glass plate is placed on the cleavage plane of the test piece, and the water seepage height of ten lines is measured by a straight steel ruler.

Technical Field

The invention relates to the technical field of concrete index detection, in particular to a method for detecting concrete impermeability.

Background

As is well known, in the building inspection industry, the inspection of the anti-permeability performance of buildings is often involved, the so-called anti-permeability performance refers to the performance of materials used in buildings against the permeation of water and other liquid media under the action of pressure, and concrete anti-permeability instruments are widely used in the field due to their advantages to inspect the anti-permeability performance of the materials.

At present, the following steps are mostly adopted when the impermeability of concrete is detected: test piece preparation, test piece are polished, the test piece is scribbled sealing material, test piece installation to examination mould, load and carry out the test on the permeameter, but in the actual operation in-process, often can appear trying the phenomenon that takes place to leak between mould and the test piece, the reason that leads to this kind of phenomenon to appear is that the bonding is inseparable between sealing material and the test piece, this kind of phenomenon appears, and the operator need stop to detect, seals again, greatly reduced work efficiency.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for detecting the impermeability of concrete, which aims to solve the problem of water leakage between a test die and a test piece in the prior art and improve the working efficiency.

The method for detecting the impermeability of the concrete comprises the following steps:

s1, manufacturing a test piece mold: the test piece mold is hollow and is provided with an opening at the top, and annular solid sealing materials are placed on the inner wall of the test piece mold;

s2, manufacturing a test piece: uniformly mixing raw materials of concrete with water, putting the mixed materials into a test piece mold, and standing for molding;

s3, after molding, placing the test piece and the test piece mold in an oven, heating to melt the solid sealing material, cooling to normal temperature to re-solidify the melted solid sealing material;

s4, removing the test piece die, and taking out the test piece with the sealing material;

s5, cutting off a part of one end of the test piece close to the test piece mold, and polishing the test piece mold smoothly;

s6, passing the test piece through a test mould preheated by an oven or an electric furnace through a spiral pressurizer to enable the bottom surface of the test piece and the bottom of the test mould to be flush, and releasing pressure after the test mould is cooled;

and S7, loading the membrane on a permeameter for testing.

In the method for testing impermeability of concrete of the present invention, in step S1, a release agent is sprayed between the inner wall of the sample mold and the solid sealing material.

In the method for detecting the impermeability of the concrete, the solid sealing material in the step S1 is paraffin and rosin, and the mass of the paraffin is as follows: the mass of the rosin is 100: 2-7.

In the method for detecting the impermeability of the concrete, the heating mode in the step S3 is hair dryer heating, heating to 45 ℃ at the speed of 5 ℃ per minute, keeping the temperature for 20 minutes, heating to 80 ℃ at the speed of 5 ℃ per minute, and keeping the temperature for 30 minutes.

According to the method for detecting the impermeability of the concrete, in the step S5, a part of the test piece is cut off at one end close to the test piece mold, so that the test piece can be completely placed in the test mold, and the sealing material cannot be detected on the cut end face of the test piece.

In the method for detecting the impermeability of concrete, a wire brush is used for polishing in step S5.

In the method for detecting the impermeability of concrete, step S7 includes the following steps: the water pressure is increased by 0.1MPa from 0.1MPa every 8h, the end surface condition of the test piece is observed at any time until water seepage appears on the surfaces of 3 test pieces in 6 test pieces, and the water seepage pressure at the moment is recorded, so that the test can be stopped;

when the pressure is increased to the designed anti-permeability grade, the third test piece still does not seep water after 8 hours, which indicates that the concrete meets the design requirements, and the test can be stopped;

after the test is finished, the test mold of the impervious test piece is timely removed, the test piece is placed on a press machine, the test piece is split into two halves along the longitudinal section, after the water mark is seen clearly (about 2-3 min), the ink is used for tracing the water mark, and the handwriting is not too thick;

the glass plate is placed on the cleavage plane of the test piece, and the water seepage height of ten lines is measured by a straight steel ruler.

Compared with the prior art, the invention has the beneficial effects that: when the test piece is manufactured, the annular solid sealing material is wrapped outside concrete in advance, after the test piece is molded, the annular solid sealing material is melted and solidified, the combination degree between the sealing material and the test piece is greatly improved, the sealing performance is improved, water leakage between the sealing material and the test piece is prevented, a section of the test piece which is stained with the sealing material is cut off before testing, detection data are not affected, through the method, the probability of water leakage of the test piece in the testing process can be greatly reduced, and the detection efficiency is improved.

Drawings

FIG. 1 is a schematic view of the structure of a test piece mold, a sealing material and a test piece of the present invention;

in the drawings, the reference numbers: 1. a test piece mold; 2. sealing materials; 3. and (5) testing the test piece.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.