CN109030328B - Method for detecting drying shrinkage rate of wallboard - Google Patents
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Abstract
The invention relates to a detection method of drying shrinkage of a wallboard, and belongs to the technical field of drying shrinkage measurement. The detection method comprises the following steps: cutting the wallboard to be tested into a rectangular test piece, drawing a central line on one of two opposite surfaces along the length direction of the test piece, and drawing a central line on the central lineAnd n holes are formed along the central line at equal intervals in sequence. Soaking the test piece in 18-22 deg.C water for 48-60h, taking out, measuring the distance between two adjacent holes and calculating the average value l1. Placing the test piece in a standard dry air chamber with the temperature of 18-22 ℃ and the relative humidity of 45-55%, measuring the shrinkage value twice a day until the shrinkage value fluctuation of any two times measured by the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes again and calculating the average value l2. According to formula (l)1‑l2)/l1X 100% the drying shrinkage was calculated. The detection method is simple, easy to operate, small in error and high in accuracy.
Description
Technical Field
The invention relates to the technical field of drying shrinkage measurement, in particular to a method for detecting the drying shrinkage of a wallboard.
Background
In recent years, new concrete wall products, such as common concrete small hollow blocks, concrete perforated bricks, lightweight slats of residential partition walls and the like, are increasingly applied to civil or industrial buildings, most of the engineering quality is still good overall from the currently completed construction engineering, but a small amount of engineering walls are cracked, and the popularization and application of the concrete wall products are influenced if the problems are not effectively controlled and solved.
The cracking of the wall products is caused by a plurality of reasons, but if the drying shrinkage performance of the wall products is not good in terms of the quality of the wall products, the cracking is an important factor after the wall is built.
The drying shrinkage is volume shrinkage change of a product under a dry weather condition, the drying shrinkage is large, after a wall is built, the wall is cracked due to volume expansion and shrinkage in the dry and wet change process of the weather, the strength and the durability of the wall are influenced, and meanwhile, the heat preservation, the heat insulation, the sound insulation, the fire prevention, the water prevention, the decoration and the like of a building are influenced, so that the product is a great taboo of the building engineering.
However, the existing methods for measuring the drying shrinkage of the wall are complicated or have low accuracy, and therefore, the improvement is needed.
Disclosure of Invention
The invention aims to provide a method for detecting the drying shrinkage rate of a wallboard, which is simple, easy to operate, small in error and high in accuracy.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the invention provides a method for detecting the drying shrinkage rate of a wallboard, which comprises the following steps:
the method comprises the steps of taking a wallboard to be tested, cutting the wallboard into a cuboid test piece, drawing a central line on any one of two opposite surfaces in the length direction of the cuboid test piece, sequentially forming n holes along the central line, wherein n is larger than or equal to 3, and the distance between every two adjacent holes is equal.
Immersing the cuboid test piece in water at 18-22 ℃ for 48-60h, taking out, measuring the distance between two adjacent holes in the n holes to obtain n-1 measured values, calculating the average value of the n-1 measured values, and recording the average value as l1。
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 18-22 ℃ and the relative humidity of 45-55%, measuring the shrinkage value twice a day until the shrinkage value fluctuation of any two times measured by the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in the n holes again at the moment to obtain new n-1 measured values, and calculating to obtain the newAverage of n-1 measurements, denoted as l2。
The drying shrinkage was calculated as follows:
S＝(l1-l2)/l1×100％。
the method for detecting the drying shrinkage rate of the wallboard provided by the preferred embodiment of the invention has the beneficial effects that:
the detection method for the drying shrinkage rate of the wallboard provided by the preferred embodiment of the invention is simple and easy to operate, and can reduce the measurement error and improve the accuracy by forming a plurality of measurement holes on the same measurement surface and measuring the average value among the plurality of measurement holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The method for detecting the drying shrinkage of the wallboard according to the embodiments of the present invention is described in detail below.
The method for detecting the drying shrinkage rate of the wallboard provided by the embodiment of the invention mainly comprises the following steps: a wall plate to be measured is cut into a cuboid test piece, a central line is drawn on any one of two opposite surfaces in the length direction of the cuboid test piece (namely the connecting line of the centers of the two surfaces is in the length direction of the test piece), n holes are sequentially formed along the central line, n is larger than or equal to 3, and the distance between every two adjacent holes is equal.
In some embodiments, the number of the n holes is an odd number, that is, n is an odd number, which is beneficial to improve the accuracy.
In some embodiments, the length of the rectangular parallelepiped test piece may be, for example, 8 to 12 cm. Correspondingly, the distance between two adjacent holes in the n holes can be 1-2 cm.
The length and the hole distance are set in the range, so that the measurement base number is increased, and the error is reduced. It is worth to be noted that, the distance between the two holes is too small, although the measurement base number is more, the small distance is not easy to measure, and the requirement on the precision of the measuring instrument is too high; and the too large distance between two holes can reduce the measuring base number and influence the accuracy of the measuring result.
Further, the cuboid test piece is immersed in water at the temperature of 18-22 ℃ for 48-60 h. Preferably, the water level is at least 15mm above the test piece. Taking out after soaking, measuring the distance between two adjacent holes in the n holes to obtain n-1 measured values, calculating the average value of the n-1 measured values, and recording the average value as l1。
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 18-22 ℃ and the relative humidity of 45-55%, measuring the shrinkage value twice a day until the shrinkage value fluctuation of any two times measured by the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in n holes again at the moment to obtain new n-1 measured values, calculating the average value of the obtained new n-1 measured values, and recording the average value as l2。
The drying shrinkage was calculated as follows:
S＝(l1-l2)/l1×100％。
by forming a plurality of measurement holes on the same measurement surface and measuring the average value among the plurality of measurement holes, the measurement error can be reduced and the accuracy can be improved.
In some preferred embodiments, before soaking, the method further comprises drawing a center line on any one of two surfaces corresponding to the width of the cuboid test piece along the width direction of the cuboid test piece, and sequentially forming m holes at equal intervals along the center line, wherein m is greater than or equal to 3.
After the soaking and taking out, measuring the distance between two adjacent holes in the m holes to obtain m-1 measured values, and calculating the average value of the m-1 measured values, which is recorded as l3(ii) a Measurement of l1And l3Is recorded as L1。
Drying until the shrinkage value fluctuation of any two times measured by the same distance to be measured within 2 consecutive days is less than 0.005mm, and measuring two adjacent holes in the m holes againThe new m-1 measured values are obtained, the average value of the new m-1 measured values is calculated and is recorded as l4(ii) a Measurement of l2And l4Is recorded as L2。
Under the above conditions, the drying shrinkage is calculated as follows:
S＝(L1-L2)/L1×100％。
in some embodiments, the width of the rectangular parallelepiped test piece can be controlled to be 4 to 8 cm. The distance between two adjacent holes in the m holes can be 1-2 cm.
In some more preferable embodiments, before soaking, the method further comprises drawing a central line on any one of the two surfaces corresponding to the height along the height direction of the cuboid test piece, and sequentially forming z holes at equal intervals along the central line, wherein z is more than or equal to 3.
After the soaking and taking out, measuring the distance between two adjacent holes in the z holes to obtain z-1 measured values, and calculating the average value of the obtained z-1 measured values, which is recorded as l5(ii) a Measurement of l1、l3And l5Is recorded as L3。
Drying until the shrinkage value fluctuation of any two times measured by the same distance to be measured within 2 consecutive days is less than 0.005mm, and measuring the distance between two adjacent holes in the z holes again to obtain new z-1 measured values, and calculating the average value of the obtained new z-1 measured values, which is recorded as l6(ii) a Measurement of l2、l4And l6Is recorded as L4。
The drying shrinkage was calculated as follows:
S＝(L3-L4)/L3×100％。
in some embodiments, the height of the cuboid specimen can be controlled to be 4-6 cm. The spacing between two adjacent holes in the z holes can be 0.5-1 cm.
All points are taken on the surfaces corresponding to the length direction, the width direction and the height direction of the cuboid test piece to test the drying shrinkage rate, so that all area positions of the cuboid test piece can be covered, the determination result is closer to a true value, and the detection accuracy is further improved.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
A wall plate to be tested is taken and cut into a cuboid test piece, a central line is drawn on any one of two opposite surfaces along the length direction of the cuboid test piece, and 3 holes are formed along the central line in sequence. Wherein, the length of the cuboid test piece is 8 cm. The distance between two adjacent holes is 1 cm.
The cuboid test piece is immersed in water at 18 ℃ for 60 hours. The water level is 15mm higher than the test piece. Taking out after soaking, measuring the distance between two adjacent holes in the 3 holes to obtain 2 measured values, and calculating the average value of the 2 measured values, and recording the average value as l1。
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 18 ℃ and the relative humidity of 45%, measuring the shrinkage value twice a day until the fluctuation of the shrinkage value of any two times measured within the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in 3 holes again at the moment to obtain 2 new measured values, calculating the average value of the 2 new measured values, and recording the average value as l2。
The drying shrinkage was calculated as follows:
S＝(l1-l2)/l1×100％。
example 2
A wall plate to be measured is taken and cut into a cuboid test piece, a central line is drawn on any one of two opposite surfaces in the length direction of the cuboid test piece, and 5 holes are formed in sequence along the central line. A central line is drawn on any one of two surfaces corresponding to the width along the width direction of the cuboid test piece, and 3 holes are formed along the central line at equal intervals in sequence.
The length of the cuboid test piece is 10.5cm, and the distance between two adjacent holes in the 5 holes is 2 cm. The width of the cuboid test piece is 4cm, and the distance between two adjacent holes in the 3 holes is 1 cm.
The cuboid test piece was immersed in water at 22 ℃ for 48 hours. The water level is 20mm higher than the test piece. Taking out after soaking, measuring the distance between two adjacent holes in 5 holes to obtain 4 measured values, and calculating the average value of the obtained 4 measured values to be recorded as l1. The distance between two adjacent wells in the 3 wells was measured to obtain 2 measurements, and the average of the 2 measurements was calculated and recorded as l3. Measurement of l1And l3Is recorded as L1。
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 22 ℃ and the relative humidity of 55%, measuring the shrinkage value twice a day until the fluctuation of the shrinkage value of any two times measured within the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in 5 holes again at the moment to obtain new 4 measured values, calculating the average value of the obtained new 4 measured values, and recording the average value as l2. The distance between two adjacent holes in the 3 holes is measured again to obtain new 2 measured values, and the average value of the obtained new 2 measured values is calculated and recorded as l4. Measurement of l2And l4Is recorded as L2。
The drying shrinkage was calculated as follows:
S＝(L1-L2)/L1×100％。
example 3
A wall plate to be measured is taken and cut into a cuboid test piece, a central line is drawn on any one of two opposite surfaces along the length direction of the cuboid test piece, and 7 holes are formed in sequence along the central line. A central line is drawn on any one of two surfaces corresponding to the width along the width direction of the cuboid test piece, and 5 holes are formed along the central line at equal intervals in sequence. A central line is drawn on any one of the two surfaces corresponding to the height along the height direction of the cuboid test piece, and 3 holes are formed along the central line at equal intervals in sequence.
Wherein, the length of the cuboid test piece is 12cm, and the distance between 7 holes is 1.5 cm. The width of the cuboid test piece is 8cm, and the distance between two adjacent holes in the 5 holes is 1.5 cm. The height of the cuboid test piece is 4cm, and the distance between two adjacent holes in the 3 holes is 0.5 cm.
The cuboid test piece was immersed in water at 20 ℃ for 54 h. The water level is 25mm higher than the test piece. Taking out after soaking, measuring the distance between two adjacent holes in 7 holes to obtain 6 measured values, calculating the average value of the 6 measured values, and recording the average value as l1. The distance between two adjacent holes in 5 holes was measured to obtain 4 measurement values, and the average of the obtained 4 measurement values was calculated and recorded as l3. Measurement of l1And l3Is recorded as L1. The distance between two adjacent wells in the 3 wells was measured to obtain 2 measurements, and the average of the 2 measurements was calculated and recorded as l5. Measurement of l1、l3And l5Is recorded as L3。
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 20 ℃ and the relative humidity of 50%, measuring the shrinkage value twice a day until the fluctuation of the shrinkage value of any two times measured within the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in 7 holes again at the moment to obtain new 6 measured values, calculating the average value of the obtained new 6 measured values, and recording the average value as l2. Measuring the distance between two adjacent holes in the 5 holes again to obtain new 4 measured values, and calculating the average value of the obtained new 4 measured values, and recording the average value as l4. Measurement of l2And l4Is recorded as L2. The distance between two adjacent holes in the 3 holes is measured again to obtain new 2 measured values, and the average value of the obtained new 2 measured values is calculated and recorded as l6. Measurement of l2、l4And l6Is recorded as L4。
The drying shrinkage was calculated as follows:
S＝(L3-L4)/L3×100％。
example 4
A wall plate to be measured is taken and cut into a cuboid test piece, a central line is drawn on any one of two opposite surfaces along the length direction of the cuboid test piece, and 7 holes are formed in sequence along the central line. A central line is drawn on any one of two surfaces corresponding to the width along the width direction of the cuboid test piece, and 3 holes are formed along the central line at equal intervals in sequence. A central line is drawn on any one of the two surfaces corresponding to the height along the height direction of the cuboid test piece, and 5 holes are formed along the central line at equal intervals in sequence.
Wherein, the length of the cuboid test piece is 12cm, and the distance between 7 holes is 1.5 cm. The width of the cuboid test piece is 6cm, and the distance between two adjacent holes in the 3 holes is 1.5 cm. The height of the cuboid test piece is 6cm, and the distance between two adjacent holes in the 5 holes is 1 cm.
The cuboid test piece was immersed in water at 20 ℃ for 54 h. The water level is 25mm higher than the test piece. Taking out after soaking, measuring the distance between two adjacent holes in 7 holes to obtain 6 measured values, calculating the average value of the 6 measured values, and recording the average value as l1. The distance between two adjacent wells in the 3 wells was measured to obtain 2 measurements, and the average of the 2 measurements was calculated and recorded as l3. Measurement of l1And l3Is recorded as L1. The distance between two adjacent holes in 5 holes was measured to obtain 4 measurement values, and the average of the obtained 4 measurement values was calculated and recorded as l5. Measurement of l1、l3And l5Is recorded as L3。
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 20 ℃ and the relative humidity of 50%, measuring the shrinkage value twice a day until the fluctuation of the shrinkage value of any two times measured within the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in 7 holes again at the moment to obtain new 6 measured values, calculating the average value of the obtained new 6 measured values, and recording the average value as l2. The distance between two adjacent holes in the 3 holes is measured again to obtain new 2 measured values, and the average value of the obtained new 2 measured values is calculated and recorded as l4. Measurement of l2And l4Is recorded as L2. Re-assay in 5 wellsObtaining new 4 measured values according to the distance between two adjacent holes, and calculating the average value of the obtained new 4 measured values, and recording the average value as l6. Measurement of l2、l4And l6Is recorded as L4。
The drying shrinkage was calculated as follows:
S＝(L1-L2)/L1×100％。
example 5
A wall plate to be measured is taken and cut into a cuboid test piece, a central line is drawn on any one of two opposite surfaces along the length direction of the cuboid test piece, and 7 holes are formed in sequence along the central line. A central line is drawn on any one of two surfaces corresponding to the width along the width direction of the cuboid test piece, and 7 holes are formed along the central line at equal intervals in sequence. A central line is drawn on any one of the two surfaces corresponding to the height along the height direction of the cuboid test piece, and 7 holes are formed along the central line at equal intervals in sequence.
Wherein, the length of cuboid test piece is 10cm, and the interval between 7 holes is 1 cm. The width of the cuboid test piece is 8cm, and the distance between two adjacent holes in the 7 holes is 1 cm. The height of the cuboid test piece is 5.5cm, and the distance between two adjacent holes in the 7 holes is 0.7 cm.
The cuboid test piece was immersed in water at 20 ℃ for 54 h. The water level is 25mm higher than the test piece. Taking out after soaking, measuring the distance between two adjacent holes in 7 holes in the surface corresponding to the length direction to obtain 6 measured values, and calculating the average value of the 6 measured values, which is recorded as l1. Measuring the distance between two adjacent holes in 7 holes in the surface corresponding to the width direction to obtain 6 measured values, and calculating the average value of the 6 measured values, which is recorded as l3. Measurement of l1And l3Is recorded as L1. Measuring the distance between two adjacent holes in 7 holes in the surface corresponding to the height direction to obtain 6 measured values, and calculating the average value of the 6 measured values, wherein the average value is recorded as l5. Measurement of l1、l3And l5Is recorded as L3。
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 20 ℃ and the relative humidity of 50%, measuring the shrinkage value twice a day until the fluctuation of the shrinkage value of any two times measured within the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in 7 holes in the surface corresponding to the length direction again at the moment, obtaining new 6 measured values, calculating the average value of the obtained new 6 measured values, and recording the average value as l2. Measuring the distance between two adjacent holes in 7 holes in the surface corresponding to the width direction again to obtain new 6 measured values, and calculating the average value of the obtained new 6 measured values to be recorded as l4. Measurement of l2And l4Is recorded as L2. Measuring the distance between two adjacent holes in 7 holes in the surface corresponding to the height direction again to obtain new 6 measured values, and calculating the average value of the obtained new 6 measured values to be recorded as l6. Measurement of l2、l4And l6Is recorded as L4。
The drying shrinkage was calculated as follows:
S＝(L1-L2)/L1×100％。
test examples
Examples 1-5 were repeated, and control groups 1-5 corresponding to examples 1-5 were prepared, and tested by the method described in GB/T19631-2005. Examples 1-5 and controls 1-5 were measured 5 times and compared for 5 results of dispersion. The accuracy of examples 1-5 was compared to controls 1-5, the results were characterized as dispersion, and the results showed: the value dispersion of the 5-time drying shrinkage measured by the example is lower than that of the control group, which shows that the detection method of the drying shrinkage of the wallboard provided by the application has smaller error and higher accuracy. The reason may be that the measurement in national standard needs to be measured by a hand-held strain gauge, and the stability of the test is influenced by manual experiment operation. The results of comparative examples 1 to 3 show that the dispersion degree of example 3 is smaller than that of example 2, and the dispersion degree of example 2 is smaller than that of example 1, which shows that the drying shrinkage rate can be further improved by performing the point measurement on the surfaces corresponding to the length direction, the width direction and the height direction of the rectangular parallelepiped test piece.
In conclusion, the detection method for the drying shrinkage rate of the wallboard provided by the embodiment of the invention is simple, easy to operate, small in error and high in accuracy.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (8)
1. A method for detecting the drying shrinkage of a wallboard is characterized by comprising the following steps:
cutting a wallboard to be tested into a cuboid test piece, drawing a central line on any one of two opposite surfaces in the length direction of the cuboid test piece, and sequentially forming n holes along the central line, wherein n is more than or equal to 3, and the distance between every two adjacent holes is equal;
immersing the cuboid test piece in water at the temperature of 18-22 ℃, soaking for 48-60h, taking out, measuring the distance between two adjacent holes in the n holes to obtain n-1 measured values, and calculating the average value of the n-1 measured values, which is recorded as l1；
Then placing the cuboid test piece in a standard dry air chamber with the temperature of 18-22 ℃ and the relative humidity of 45-55%, measuring the shrinkage value twice a day until the shrinkage value fluctuation of any two times measured by the same distance to be measured within 2 consecutive days is less than 0.005mm, measuring the distance between two adjacent holes in the n holes again at the moment, obtaining new n-1 measured values, calculating the average value of the new n-1 measured values, and recording the average value as l2；
The drying shrinkage was calculated as follows:
S＝(l1-l2)/l1×100％；
before soaking, drawing a central line on any one of two surfaces corresponding to the width along the width direction of the cuboid test piece, and sequentially forming m holes at equal intervals along the central line, wherein m is more than or equal to 3;
after the soaking and taking out, the method also comprises the steps of measuring the distance between two adjacent holes in the m holes to obtain m-1 measured values, calculating the average value of the m-1 measured values, and recording the average value as l3(ii) a Measurement of l1And l3Is recorded as L1；
Drying until the shrinkage value fluctuation of any two times measured within the same distance to be measured within 2 consecutive days is less than 0.005mm, and measuring the distance between two adjacent holes in the m holes again to obtain new m-1 measured values, and calculating the average value of the new m-1 measured values, which is recorded as l4(ii) a Measurement of l2And l4Is recorded as L2；
The drying shrinkage was calculated as follows:
S＝(L1-L2)/L1×100％；
before soaking, drawing a central line on any one of the two surfaces corresponding to the height along the height direction of the cuboid test piece, and sequentially forming z holes at equal intervals along the central line, wherein z is more than or equal to 3;
after soaking and taking out, the method also comprises the steps of measuring the distance between two adjacent holes in the z holes to obtain z-1 measured values, and calculating the average value of the obtained z-1 measured values to be recorded as l5(ii) a Measurement of l1、l3And l5Is recorded as L3；
Drying until the shrinkage value fluctuation measured at any two times within 2 consecutive days at the same distance to be measured is less than 0.005mm, and measuring the distance between two adjacent holes in the z holes again to obtain new z-1 measured values, and calculating the average value of the obtained new z-1 measured values, wherein the average value is recorded as l6(ii) a Measurement of l2、l4And l6Is recorded as L4；
The drying shrinkage was calculated as follows:
S＝(L3-L4)/L3×100％。
2. the inspection method according to claim 1, wherein the length of the rectangular parallelepiped test piece is 8 to 12 cm.
3. The detection method according to claim 1, wherein the number of n holes is an odd number.
4. The method of claim 1, wherein the spacing between two adjacent ones of the n holes is 1-2 cm.
5. The inspection method according to claim 1, wherein the rectangular parallelepiped test piece has a width of 4 to 8 cm.
6. The method of claim 1, wherein the spacing between two adjacent ones of the m holes is 1-2 cm.
7. The inspection method according to claim 1, wherein the height of the rectangular parallelepiped test piece is 4 to 6 cm.
8. The method of claim 1, wherein the z holes are spaced 0.5-1cm apart from each other.
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| JP2008281390A (en) * | 2007-05-09 | 2008-11-20 | Shimadzu Corp | Manufacturing method of bending test tool, bending test tool and bending test device |
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