CN107621483A

CN107621483A - A kind of method of testing of micro concrete hole solution pH value

Info

Publication number: CN107621483A
Application number: CN201710702250.3A
Authority: CN
Inventors: 刘西光; 牛荻涛; 李星辰; 吕瑶
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2017-08-16
Filing date: 2017-08-16
Publication date: 2018-01-23

Abstract

The invention belongs to disclose a kind of method of testing of micro concrete hole solution pH value, instrument needed for test is laboratory pH meter main frame, centrifuge tube and STMICRO5 type pH microelectrodes.Testing procedure includes：Hole solution to be measured is placed in centrifuge tube, and pH microelectrodes are connected on the pH meter main frame of laboratory and demarcated, and electrode end glass marble, which is immersed in hole solution to be measured, to be tested.Have simple operation, instrument is simple, it is as a result accurate the advantages of.

Description

A kind of method of testing of micro concrete hole solution pH value

Technical field

The invention belongs to the method for testing of field of civil engineering, and in particular to a kind of survey of micro concrete hole solution pH value Method for testing.

Background technology

In having studied, when preparing hole solution research concrete pH value relevant issues using milling process, at least need 125g broken concretes are used to squeeze, and finally at least need to collect 5ml hole solutions for testing.And for only having a small amount of concrete The experiment of sample, it is only capable of squeezing and obtains micro hole solution, the data-searching carried out according to applicant, at present, for a small amount of mixed Solidifying soil sample also carries out pH tests without good method, therefore, studies a kind of method of testing of micro concrete hole solution pH value, Research to a small amount of concrete sample has great importance.

The content of the invention

For defect present in the studies above or deficiency, it is an object of the present invention to provide a kind of micro concrete hole The method of testing of solution ph, this method have simple operation, and instrument is simple, it is as a result accurate the advantages of.

In order to realize above-mentioned task, the present invention takes following technical solution：

A kind of method of testing of micro concrete hole solution pH value, the instrument that this method uses is container, laboratory pH meter Main frame and STMICRO5 type pH microelectrodes, it is characterised in that specifically carry out according to the following steps：

Step 1, by 30g broken concrete, squeezing obtains 1ml~2ml concrete hole solutions, and imports in centrifuge tube Seal and preservation, obtain concrete hole solution to be measured；

Step 2, STMICRO5 type pH microelectrodes are connected on the pH meter main frame of laboratory, by the micro- electricity of STMICRO5 types pH The glass marble of pole end immerses in pH=6.86 and pH=9.18 buffer solution respectively to be demarcated；

Step 3, the glass marble for the STMICRO5 type pH microelectrodes end demarcated is inserted into container and immerses coagulation to be measured In native hole solution, recorded after stable reading, that is, obtain micro concrete hole solution pH value.

According to the present invention, the container uses 2ml centrifuge tubes.

Further, the STMICRO5 types pH microelectrodes are the diameter combined by glass electrode and reference electrode For 5mm pH combination electrodes.

When STMICRO5 type pH microelectrodes are not used, the glass marble of STMICRO5 type pH microelectrodes end need to be immersed in In 3.3mol/L potassium chloride protection solution.

The method of testing of the micro concrete hole solution pH value of the present invention, has the advantages that：

1st, 30g or so broken concrete is only needed, you can complete pH value test.

2nd, there is simple operation, instrument is simple, as a result precisely.

Brief description of the drawings

Fig. 1 is the schematic diagram of pH value test process；

Fig. 2 is the front view of STMICRO5 type pH microelectrodes；

Fig. 3 is the front view of pH meter main frame；

Fig. 4 is the front view of container.

Fig. 5 is the pressing device structural representation of the true hole solution of micro concrete.

Fig. 6 is the base schematic diagram of the pressing device of the true hole solution of micro concrete；Wherein, (a) is front view, (b) It is top view；

Below in conjunction with drawings and examples, the present invention is described in further detail.

Embodiment

Referring to Fig. 1, the present embodiment provides a kind of method of testing of micro concrete hole solution pH value, and instrument needed for test is Laboratory pH meter main frame, container and STMICRO5 type pH microelectrodes.

In the present embodiment, STMICRO5 type pH microelectrodes are a diameter of to be combined by glass electrode and reference electrode 5mm pH combination electrodes (Fig. 2, commercially available), laboratory pH meter main frame use commercially available model ST2100 types laboratory pH meter, its Front view is as shown in Figure 3.

Container uses 2ml centrifuge tubes (Fig. 4).

Testing procedure is：

1st, first by 30g broken concrete, squeezing obtains 1ml~2ml concrete hole solutions, and imports in container and close Preserve, obtain the true hole solution of micro concrete to be measured；

The pressing device of the above-mentioned true hole solution of micro concrete has projection referring to Fig. 5 and Fig. 6, including base 1, base 1 Edge, the outer sleeve 2 and inner sleeve 3 being arranged concentrically are installed on base 1, wherein, the raised side of outer sleeve 2 and base 1 Edge is in contact, and there is the piston 4 of conducting pressure in the center of inner sleeve 3, has a circle to be used to collect hole solution in the upper surface of base 1 Circular groove 11, and have the hole solution export pipeline 12 for leading to the side of base 1 in the side of circular groove 11.

Wherein, base 1, inner sleeve 3 and piston 4 are made using Cr12MoV mould steel, and heat-treatment quenching is to 58- 62HRC。

Outer sleeve 2 is made using A3 steel.

The specific steps of the true hole solution of micro concrete are prepared using the pressing device of the true hole solution of micro concrete It is：

Step 1, use washes of absolute alcohol device, it is ensured that device working surface cleans.

Step 2, the hole solution that the solution catcher being made up of emulsion tube and syringe is connected to the side of base 1 export In the terminal 13 of pipeline 12.

Inner sleeve 3 and the body of outer barrel 2 are placed on base 1, concrete block 5 to be pressed is placed in inner sleeve 3, finally by piston 5 are placed on the concrete block to be pressed 5 in inner sleeve；

Step 3, the pressing device of the true hole solution of micro concrete is placed on forcing press and pressurizeed, added during squeezing Press speed to keep 2kN/s~3kN/s, until reach maximum pressure 800kN, pressurize 10min afterwards, continue on in pressure process The syringe of solution catcher draws hole solution under negative pressure；Repeat to load as hole solution amount does not reach requirement, after pressure release.

Step 4, squeezing circulation are carried out, and are treated that the hole solution of solution catcher reaches requirement, are stopped squeezing.

Step 5, solution catcher is unloaded from the terminal 13 of hole solution export pipeline 12, and by collected hole solution Import in other container, to carry out required test；Then inner sleeve and outer sleeve are dismantled, and it is small to take out residual concrete Block, using the pressing device of the true hole solution of the micro concrete of washes of absolute alcohol, to ensure the hole solution of each concrete block Between do not interfere with each other mutually.

2nd, STMICRO5 type pH microelectrodes are connected on the pH meter main frame of laboratory, by STMICRO5 type pH microelectrodes end Glass marble immerse in pH=6.86 and pH=9.18 buffer solution and demarcated respectively；

3rd, the glass marble for the STMICRO5 type pH microelectrodes end demarcated is inserted into container and immerses concrete hole to be measured In solution, recorded after stable reading, that is, obtain micro concrete hole solution pH value.

Pay attention to, in operational procedure STMICRO5 types pH microelectrodes test every time before concrete hole solution all need it is clear with distilled water Wash and dried with filter paper.

Claims

1. a kind of method of testing of micro concrete true hole solution ph, the instrument that this method uses is centrifuge tube, laboratory PH meter main frame and STMICRO5 type pH microelectrodes, it is characterised in that specifically carry out according to the following steps：

Step 1, by 30g broken concrete, squeezing obtains 1~2ml concrete hole solutions, and imports to close in centrifuge tube and protect Deposit, obtain concrete hole solution to be measured；

Step 2, STMICRO5 type pH microelectrodes are connected on the pH meter main frame of laboratory, by STMICRO5 type pH microelectrodes end End glass marble immerses in pH=6.86 and pH=9.18 buffer solution respectively to be demarcated；

Step 3, the glass marble for the STMICRO5 type pH microelectrodes end demarcated is inserted into container, and immerse concrete to be measured In hole solution, recorded after stable reading, that is, obtain micro concrete hole solution pH value.

2. the method as described in claim 1, it is characterised in that the container is 2ml centrifuge tubes.

3. the method as described in claim 1, it is characterised in that the STMICRO5 types pH microelectrodes are by glass electrode and reference The a diameter of 5mm of electrode combination together pH combination electrodes.

4. the method as described in claim 1, it is characterised in that glass marble when described STMICRO5 type pH microelectrodes are not used It need to be immersed in 3.3mol/L potassium chloride protection solution.

5. the method as described in claim 1 or 4, it is characterised in that the squeezing comprises the concrete steps that：

Step 1, use the pressing device of the true hole solution of the micro concrete of washes of absolute alcohol, it is ensured that device working surface is clear It is clean.

Step 2, the hole solution that the solution catcher being made up of emulsion tube and syringe is connected to base side export pipeline In terminal.

Inner sleeve and outer cylinder body are placed on base, concrete block to be pressed is placed in inner sleeve, and piston finally is placed in into inner sleeve On concrete block to be pressed in cylinder；

Step 3, the pressing device of the true hole solution of micro concrete is placed on forcing press and pressurizeed, pressurization speed during squeezing Rate keeps 2kN/s~3kN/s, until reach maximum pressure 800kN, pressurize 10min afterwards, continues on solution in pressure process The syringe of collector draws hole solution under negative pressure；Repeat to load as hole solution amount does not reach requirement, after pressure release.

Step 5, solution catcher is unloaded from the terminal of hole solution export pipeline, and collected hole solution is imported in addition Container in, to carry out required test；Then inner sleeve and outer sleeve are dismantled, and takes out residual concrete fritter, uses nothing The pressing device of the water-ethanol true hole solution of concrete micro clearly, to ensure not do mutually between the hole solution of each concrete block Disturb.

6. method as claimed in claim 5, it is characterised in that the pressing device bag of the described true hole solution of micro concrete Include base, base has the edge of projection, and the outer sleeve and inner sleeve being arranged concentrically are provided with base, wherein, outer sleeve with The side edge of pedestal lobe is touched, and there is the piston of conducting pressure in the center of inner sleeve, has a circle to be used to receive in the upper surface of base Collect the circular groove of hole solution, and have the hole solution export pipeline for leading to base side in circular groove side.