CN115684278A - Method for measuring polymer content in polymer mortar hardened body - Google Patents
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- CN115684278A CN115684278A CN202211335035.1A CN202211335035A CN115684278A CN 115684278 A CN115684278 A CN 115684278A CN 202211335035 A CN202211335035 A CN 202211335035A CN 115684278 A CN115684278 A CN 115684278A
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Abstract
The invention provides a method for measuring the content of a polymer in a polymer mortar hardened body, which comprises the following steps: s1: preparing cement mortar samples with different polymer latex powder contents; s2: under certain conditions, measuring the surface resistance value of each standard sample in the step S1; s3: drawing a working curve according to the polymer content in the mortar sample and the corresponding surface resistance value; s4: sampling a sample to be detected, and pretreating the sample to be detected; s5: and (3) under the condition of the step S2, measuring the surface resistance value of the sample to be detected pretreated in the step S4, and obtaining the content of the polymer latex powder of the sample to be detected according to the working curve in the step S3. The method for measuring the polymer content in the polymer mortar hardened body has simple steps, and a plurality of samples to be measured can be tested only under the same condition, so that the polymer content in the material can be read, the cost of testing the polymer content is reduced, and the method can be widely applied and popularized by enterprises.
Description
Technical Field
The invention belongs to the technical field of polymer content determination, and particularly relates to a method for determining the polymer content in a polymer mortar hardened body.
Background
The building external wall external thermal insulation thin plastering system is widely used in various building projects, and as an important matched material, the quality of an adhesive and a plastering mortar directly influences the overall quality of the external wall external thermal insulation project. Wherein, the content of the effective components of the polymer plays a key restriction role in the bonding firmness, crack resistance and durability of the adhesive and the rendering coat mortar. Therefore, the method has important significance for accurately measuring the content of the effective components of the polymer in the adhesive and the plastering mortar.
For the finished external wall external thermal insulation engineering, the key indexes of the materials also need to be detected. For the contents of the effective components of the polymer in the adhesive and the finishing mortar, a hardened polymer mortar sample needs to be taken from an engineering entity for carrying out related tests. The polymer cement is a novel composite material, polymer components are introduced and uniformly dispersed in a cement-based material, and polymer chain segment crosslinking and hydrated calcium silicate gel generation are synchronously realized along with the cement hydration process to form a double-gel system characterized by a network mutual transmission structure. Different from the gel generated by hydration and hardening of pure cement-based materials, the double-gel system generated by hydration and hardening of polymer cement changes the performance of the cement-based materials from many aspects, for example, the cement-based materials with the characteristics of brittleness and hardness are endowed with certain flexibility, and the cement hardened bodies which are easy to absorb water have certain permeation resistance and water resistance due to the introduction of the polymer. The change of the electrical conductivity of the cement hardened body is also an important change of the physical properties brought by the introduction of the polymer into the cement-based material, and the change degree is in a linear correlation with the incorporation amount of the polymer within a certain range.
In the prior art, the method for determining the polymer content in the polymer mortar hardened body in the prior art generally detects the polymer by using a polarizing microscope, a Fourier transform infrared spectrum, polycrystal X-ray diffraction and a parallax scanning analysis means, and obtains the polymer content in the adhesive and the finishing mortar through calculation in the prior art, so that the method has the advantages of complex steps, higher cost and long test time.
Disclosure of Invention
In view of the above, the present invention is directed to a method for determining the polymer content in a polymer mortar hardened body, so as to solve the problem.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for measuring the content of polymer in a polymer mortar hardened body comprises the following steps:
s1: preparing cement mortar standard samples with different polymer latex powder contents;
s2: under certain conditions, measuring the surface resistance value of each standard sample in the step S1;
s3: drawing a working curve according to the polymer content in the mortar sample and the corresponding surface resistance value;
s4: sampling a sample to be detected, and pretreating the sample to be detected;
s5: and (3) under the condition of the step S2, measuring the surface resistance value of the sample to be detected pretreated in the step S4, and obtaining the content of the polymer latex powder of the sample to be detected according to the working curve in the step S3.
The polymer latex powder in the step S1 is redispersible polymer latex powder;
the cement mortar standard sample in the step S1 is prepared from Portland cement, natural sand and polymer latex powder, the ratio of the Portland cement to the natural sand is 1.5, and the mixing amount of the polymer latex powder is respectively 0, 0.5wt%, 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, 3.0wt%, 3.5wt% and 4.0wt%;
preferably, the natural sand is continuous grading water washing and drying natural sand with the grain diameter of less than or equal to 1 mm.
The preparation of the cement mortar standard sample in the step S1 comprises the following steps: adding water into premixed dry powder mortar of silicate cement, natural sand and polymer latex powder to prepare a mortar mixture, controlling the fluidity of the mixture to be 220 mm +/-10 mm, respectively filling the mixtures with the mixing amounts into a cement mortar triple test mold, demolding after the sample is finally solidified under standard curing conditions, and performing standard curing for 28 days;
preferably, the cement mortar triple trial mold is a cement mortar triple trial mold of 40 mm × 160 mm.
The certain conditions in the step S2 comprise that the temperature is set to be 23 +/-2 ℃ and the temperature is set to be 50% in a laboratory, and the standing time is at least 48 hours.
And the surface resistance value measured in the step S2 and the surface resistance value measured in the step S5 are measured by a surface resistance value measuring instrument which has the measuring range of 0.1K omega-1.0M omega, the precision of 0.005K omega and is a flexible measuring contact.
And the step S3 of drawing the working curve is to use the actually measured surface resistance value of the sample as an abscissa and the polymer doping amount of the sample as an ordinate, and drawing the measurement result to obtain the working curve of the polymer content of the mortar sample and the corresponding surface resistance value.
And S4, preprocessing the sample to be detected comprises polishing the sample to be detected with sand paper, cleaning surface floating dust and particles, and carrying out state adjustment on the processed sample to be detected at 23 +/-2 ℃ under the condition that the relative humidity is 50%.
The step S5 of measuring the surface resistance value of the sample to be measured pretreated in the step S4 includes selecting different measurement areas, measuring the surface resistance value of the sample to be measured multiple times, taking an arithmetic average value, and reading the polymer content of a working curve corresponding to the arithmetic average resistance value. The invention obtains the detection result of the polymer content in the material by measuring the fecal surface resistance value of the sample to be detected by utilizing the direct correlation between the surface conductivity of the polymer cement-based material and the polymer doping amount.
The number of times of measuring the surface resistance value of the sample to be measured is at least 5 times.
Compared with the prior art, the method for measuring the polymer content in the polymer mortar hardened body has the following beneficial effects:
the method has simple steps, can directly read and measure the sample to be tested by preparing the standard sample and the working curve, can measure a group of working curves, can read the polymer content in the material by testing a plurality of samples to be tested only under the same condition, reduces the cost of testing the polymer content, and can be widely applied and popularized by enterprises.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a graph showing the relationship between the surface resistance value and the polymer content of a hardened polymer cement mortar.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Before specific sample detection is carried out, a series of standard samples are firstly made, and a working curve is drawn. The 'dunshi' ordinary portland cement P.O52.5 produced by Jidong cement Co., ltd, the continuous grade water-mixing dried natural sand with the particle size of less than or equal to 1 mm produced by Quyang county of Hebei province, and the 'Keyuan' 0520 redispersible polymer latex powder produced by Tianjin Tianying novel building materials Co., ltd are adopted, and the mixing amount of the redispersible polymer latex powder is 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, 3.0wt%, 3.5wt% and 4.0wt% according to the fixed mortar-sand ratio of 1. And adding water into the premixed dry powder mortar to prepare a mortar mixture, and controlling the fluidity of the mixture to be 220 mm +/-10 mm. And respectively filling the mortar mixture with each addition amount into a 40 mm-160 mm cement mortar triple test mold, demolding after the sample is finally solidified under standard culture conditions, and performing standard culture for 28 days at the temperature of 20 ℃ and the humidity of more than 95%. And after the maintenance period, taking out the sample from the standard maintenance room, placing the sample in a laboratory with the temperature of 23 +/-2 ℃ and the humidity of 50%, and placing the sample for more than 48 hours to finish the state adjustment. A ZX-4000 concrete resistivity tester manufactured by Beijing Huidatian scientific and technological development Limited is used, the range is 0.1K omega-10.0K omega, the precision is 0.005K omega, and the tester is a flexible measuring contact. The surface resistance values of the above standard samples were measured as follows: (in the table, the resistance units are all K omega)
According to the data in the table, the EXCEL plotting software is used to plot the working curve as shown in FIG. 1.
Example one
The exterior wall external thermal insulation thin plastering system is adopted for carrying out the thermal insulation of the enclosure structure in certain residential engineering, and the project is checked and accepted in different terms after the project is finished. Samples including hardened adhesive, molded polystyrene graphite plate, hardened plaster adhesive (containing glass fiber mesh), putty for exterior surface and decorative paint are taken from the finished wall. Stripping the sample to obtain a sample with an area of more than 100cm 2 Removing the attached foam polystyrene board, polishing and flattening with sand paper, and cleaning floating dust and particulate matters on the surface. The treated test piece is placed in a curing room (or curing box) with the temperature of 23 +/-2 ℃ and the relative humidity of 50% for state adjustment. And taking out after 48 hours, and respectively measuring the surface resistance values of the adhesive and the plastering mortar hardened body by using a surface resistance value tester which has the measuring range of 0.1-1.0M omega, the precision of 0.005K omega and is a flexible measuring contact. Different measurement areas are selected, 5 times of measurement are carried out, and an arithmetic mean value is taken. The results are shown in the following table:
surface resistance value of the adhesive cured body: 1.415K Ω, surface resistance value of the coating cement hardened body: 1.765K Ω. Reading the polymer content of the working curve corresponding to the resistance value to obtain: the polymer content in the adhesive is 2.2 percent, and the polymer content in the rendering coat mortar is 3.1 percent.
Example two
In certain residential engineering, an exterior wall external thermal insulation thin plastering system is adopted for carrying out thermal insulation on an enclosure structure, and the falling of an exterior wall thermal insulation layer occurs after the engineering is finished for 4 years. The sample is taken from the dropped wall heat-insulating layer and comprises an adhesive hardened body, a polystyrene extruded sheet, a plastering adhesive cement hardened body (containing glass fiber mesh), exterior facing putty and decorative paint. Stripping the sample to obtain a sample with an area of more than 100cm 2 Removing the adhered foamed polystyrene board, polishing with sand paper, and cleaning surface dust and particles. The treated test piece is placed in a curing room (or curing box) with the temperature of 23 +/-2 ℃ and the relative humidity of 50 percent for state adjustment. And taking out after 48 hours, and respectively measuring the surface resistance values of the adhesive and the plastering mortar hardened body by using a surface resistance value tester which has the measuring range of 0.1-1.0M omega, the precision of 0.005K omega and is a flexible measuring contact. Different measurement areas are selected, 5 times of measurement are carried out, and an arithmetic mean value is taken. The results are shown in the following table:
| kind of sample | Adhesive agent | Plastering mortar |
| Resistance value of the first measuring region, K omega | 1.250 | 1.330 |
| Resistance value of the second measuring region, K omega | 1.230 | 1.280 |
| Third measurement area resistance, K Ω | 1.265 | 1.315 |
| Fourth measurement area resistance, K Ω | 1.235 | 1.295 |
| Resistance value of the fifth measuring region, K omega | 1.255 | 1.305 |
| Surface resistance average, K.OMEGA | 1.245 | 1.305 |
Surface resistance value of the adhesive cured body: 1.245K Ω, surface resistance value of the rendering coat mortar hardened body: 1.305K omega. Reading the polymer content of the working curve corresponding to the resistance value to obtain: the polymer content in the adhesive is 1.6 percent, and the polymer content in the rendering coat mortar is 1.8 percent.
Claims (9)
1. A method for measuring the content of a polymer in a polymer mortar hardened body, which is characterized in that: the method comprises the following steps:
s1: preparing cement mortar samples with different polymer latex powder contents;
s2: under certain conditions, measuring the surface resistance value of each standard sample in the step S1;
s3: drawing a working curve according to the polymer content in the mortar sample and the corresponding surface resistance value;
s4: sampling a sample to be detected, and pretreating the sample to be detected;
s5: and (3) under the condition of the step S2, measuring the surface resistance value of the sample to be detected pretreated in the step S4, and obtaining the content of the polymer latex powder of the sample to be detected according to the working curve in the step S3.
2. The method according to claim 1, wherein the method comprises the steps of: the polymer latex powder in the step S1 is redispersible polymer latex powder;
the cement mortar standard sample in the step S1 is prepared from Portland cement, natural sand and polymer latex powder, the ratio of the Portland cement to the natural sand is 1.5, and the mixing amount of the polymer latex powder is 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, 3.0wt%, 3.5wt% and 4.0wt% respectively;
preferably, the natural sand is continuous grading water washing and drying natural sand with the grain diameter of less than or equal to 1 mm.
3. The method according to claim 1, wherein the method comprises the steps of: the preparation of the cement mortar standard sample in the step S1 comprises the following steps: adding water into premixed dry powder mortar of silicate cement, natural sand and polymer latex powder to prepare a mortar mixture, controlling the fluidity of the mixture to be 220 mm +/-10 mm, respectively filling the mixtures with the mixing amounts into a cement mortar triple test mold, demolding after the sample is finally solidified under standard curing conditions, and performing standard curing for 28 days;
preferably, the cement mortar triple trial mold is a cement mortar triple trial mold of 40 mm × 160 mm.
4. The method according to claim 3, wherein the method comprises the steps of: the certain conditions in the step S2 comprise that the temperature is set to be 23 +/-2 ℃ and the temperature is set to be 50% in a laboratory, and the standing time is at least 48 hours.
5. The method according to claim 1, wherein the method comprises the steps of: and the surface resistance value measured in the step S2 and the surface resistance value measured in the step S5 are measured by a surface resistance value measuring instrument which has the measuring range of 0.1K omega-1.0M omega, the precision of 0.005K omega and is a flexible measuring contact.
6. The method according to claim 1, wherein the method comprises the steps of: and the step S3 of drawing the working curve is to use the actually measured surface resistance value of the sample as an abscissa and the polymer doping amount of the sample as an ordinate, and drawing the measurement result to obtain the working curve of the polymer content of the mortar sample and the corresponding surface resistance value.
7. The method according to claim 1, wherein the method comprises the steps of: and S4, preprocessing the sample to be detected comprises polishing and flattening the sample to be detected by using abrasive paper, cleaning floating dust and particulate matters on the surface, and adjusting the state of the processed sample to be detected under the conditions that the temperature is 23 +/-2 ℃ and the relative humidity is 50%.
8. The method for determining the polymer content in the polymer mortar hardened body according to claim 1, wherein: the step S5 of measuring the surface resistance value of the sample to be measured pretreated in the step S4 includes selecting different measurement regions, measuring the surface resistance value of the sample to be measured multiple times, taking an arithmetic mean value, and reading the polymer content of the working curve corresponding to the arithmetic mean resistance value.
9. The method according to claim 1, wherein the method comprises the steps of: the number of times of measuring the surface resistance value of the sample to be measured is at least 5 times.
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