CN114295447B - Method for making cement stability test cake - Google Patents
Method for making cement stability test cake Download PDFInfo
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- CN114295447B CN114295447B CN202210005317.9A CN202210005317A CN114295447B CN 114295447 B CN114295447 B CN 114295447B CN 202210005317 A CN202210005317 A CN 202210005317A CN 114295447 B CN114295447 B CN 114295447B
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Abstract
The invention relates to a method for manufacturing a cement stability test cake, which adopts three floating modes to treat the surface of a test cake after vibration molding: the initial trowelling is carried out immediately after the vibration forming, so that the cement paste has high fluidity and good plasticity, the contact area of the cement paste and a knife is large, the cement paste is easy to adhere to the surface of the knife, and the surface smoothness of the trowelled test cake is poor; when the cement paste reaches an initial setting state, the fluidity is lost, the adhesion force with the surface of a knife is reduced, and the surface smoothness of a test cake after trowelling is increased; when the cement paste reaches the final setting state, the plasticity is completely lost, the strength is generated, and the surface smoothness of the test cake is further improved by wiping the surface of the test cake with wax paper. The test cake prepared by the invention has smooth surface, can avoid cracks caused by stress generated by uneven surface when the test cake is boiled, and can avoid the influence on the accuracy of an experimental result.
Description
Technical Field
The invention belongs to the technical field of cement performance testing, and particularly relates to a manufacturing method of a cement stability test cake.
Background
In the current national standard GB/T1346-2011 'method for testing water consumption, setting time and stability of standard consistency of cement', when the stability of the cement is tested by a substitute method (a test cake method), a forming method of a test cake comprises the following steps: mixing the pure cement paste with the standard consistency in a pure cement paste mixer; taking out a part of the mixed cement paste with the standard consistency to form a sphere, and placing the sphere on a glass plate prepared in advance; slightly vibrating the glass plate, and wiping the glass plate from the edge to the center by using a knife wiped by wet cloth to prepare a test cake with the diameter of 70-80 mm, the center thickness of about 10mm, gradually thinned edge and smooth surface; and putting the test cakes into a moisture curing box, curing for 24 +/-2 hours, and removing the test cakes.
The method for testing whether the stability of the cement is qualified by the cake test method comprises the following steps: placing the test cake into a boiling box to boil for 180 + -5 min under the condition that the test cake is not defective; after boiling, no crack is found on the test cake by visual inspection, and the test cake which is not bent is checked by a steel ruler and is qualified in stability, otherwise, the test cake is unqualified.
In the method for making the existing national standard cement stability test cake, a part of mixed cement paste with standard consistency is taken out to be spherical and put on a prepared oiled glass plate; gently vibrating the glass plate, and wiping a knife wiped by a wet cloth from the edge to the center to prepare a test cake with the diameter of 70-80 mm, the center thickness of about 10mm, gradually thinned edge and smooth surface; and (4) putting the test cakes into a moisture curing box, curing for 24 +/-2 hours, and removing the test cakes.
However, in the above method, when the spherical shape is formed, the size and shape of the formed spherical shape are greatly different because the method is not specific and individual understanding is different; when the glass plate is vibrated, the individual understanding is different due to the fact that the vibration method is not specific, and the cement paste cannot be guaranteed to be uniform by light vibration in many cases; in addition, when the knife is touched, the cement paste has large liquidity, is easy to deform, has large contact area with the knife, is easy to adhere to the surface of the knife, is not easy to smear smoothly, and can form obvious ribs on the contrary.
Disclosure of Invention
In order to solve the defects of the existing cement stability test cake manufacturing method, such as unreliability, large operation randomness and unsmooth surface of a formed test cake, the invention provides the cement stability test cake manufacturing method which is standard and can ensure that the surface of the test cake is smooth, a mould with a specified shape is used for containing cement paste, and the cement paste is fully vibrated, so that the volume, the shape and the uniformity of the test cake can be controlled, meanwhile, secondary floating is carried out when the cement is in an initial setting state, and wax paper is used for wiping when the cement is in a final setting state, so that the smoothness of the surface of the test cake is ensured, and the test accuracy is improved.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. According to the cement stability test cake making method provided by the invention, firstly, the cement paste with the standard consistency is mixed on a cement paste mixer, and the cement paste amount m contained in a truncated cone test mold is determined, and the cement stability test cake making method is characterized by further comprising the following steps of: 1) Placing a truncated cone test mold smeared by wet cloth with the big head facing downwards on a non-oiled glass plate smeared by the wet cloth, placing the non-oiled glass plate in the center of a table top of a cement mortar fluidity tester, covering the truncated cone test mold and the non-oiled glass plate by the wet cloth, then weighing m +5g of standard-consistency cement paste, placing the side edge of a material plate on a test table, holding the upper part of the material plate by one hand, stirring the cement paste for 15 times along the inner side wall of the material plate close to the test table by the other hand by a stirring knife with the width of 10mm, wrapping the cement paste by the stirring knife once, placing the cement paste into the truncated cone test mold, vibrating the truncated cone test mold on the cement mortar fluidity tester for 50 times, finally scraping the redundant cement paste on the surfaces of the truncated cone test mold from the center on the truncated cone test mold to two sides respectively, and wiping off the outer surface of the truncated cone test mold and the redundant cement paste on the glass plate; 2) The truncated cone test mould is translated to the oiled glass plate from the oiled glass plate, then the oiled glass plate and the truncated cone test mould thereon are placed in the center of the table top of the cement mortar fluidity tester, after the truncated cone test mould is removed, the test mould is vibrated for 10 times to make the cement paste on the oiled glass plate be in a round cake shape, which is called a test cake, and finally, the surface of the test cake is smoothed by a smoothing knife; 3) Placing the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box for curing to an initial setting state, taking out the oiled glass plate and the test cake from the curing box, and using a trowelling knife to trowel the surface of the test cake for the second time; then placing the oiled glass plate and the test cake after secondary floating into a constant temperature and humidity standard curing box for curing to a final setting state; 4) Taking out the oiled glass plate and the test cake in the final setting state from the curing box, wiping the surface of the test cake to be smooth by using wax paper, then continuously putting the oiled glass plate and the wiped test cake into a constant-temperature constant-humidity standard curing box for curing for 24 hours (timing from the contact of cement and water), and finally removing the oiled glass plate to obtain the test cake with a smooth surface.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
In the method for making the cement stability test cake, the temperature of the constant-temperature constant-humidity standard curing box is 19-21 ℃, and the humidity is 90-92%.
In the above method for making cement stability test cakes, the method for determining the net slurry amount m of cement contained in the truncated cone test mould comprises the following steps: 1) Smearing the oilless glass plate and the inner wall of the truncated cone test mold by using wet cloth, then placing the oilless glass plate in the center of a table top of a cement mortar fluidity tester, placing the large end of the truncated cone test mold downwards in the center of the glass plate, and covering the truncated cone test mold and the glass plate by using the wet cloth to keep the humidity of the truncated cone test mold and the glass plate; 2) Placing cement paste with standard consistency in a stainless steel tray, placing the side edge of the tray on an experiment table, holding the upper part of the tray with one hand, stirring the cement paste for 15 times along the inner side wall of the tray close to the experiment table with a stirring knife with the width of 10mm with the other hand, wrapping the cement paste with the stirring knife for one time, placing the wrapped cement paste into a truncated cone test mold, starting a cement mortar fluidity tester to vibrate for 50 times to enable the cement paste to fully fill the cavity of the truncated cone test mold, and scraping off excessive cement paste on the surface of the truncated cone test mold from the center of the upper part of the truncated cone test mold to two sides respectively; 3) Wiping off the outer surface of the truncated cone test mold and the excess cement paste on the glass plate, weighing the total mass m1 of the truncated cone test mold, the cement paste and the glass plate, and subtracting the total mass m2 of the truncated cone test mold and the glass plate wiped by wet cloth to obtain m.
Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the invention can achieve considerable technical progress and practicability, has wide industrial utilization value and at least has the following advantages:
(1) The invention uses the mould with the regulated shape to contain cement paste, and uses a certain method to vibrate and form a stability test cake on a regulated instrument, thereby controlling the volume, the shape and the uniformity of the test cake, and the measurement result of the cement stability is more comparable due to the regulation of the operation process.
(2) The invention adopts three floating modes to treat the surface of the test cake after vibration forming: the initial trowelling is carried out immediately after the vibration forming, so that the cement paste has high fluidity and good plasticity, the contact area of the cement paste and a knife is large, the cement paste is easy to adhere to the surface of the knife, and the surface smoothness of the trowelled test cake is poor; when the cement paste reaches an initial setting state (begins to lose plasticity), the fluidity is lost, the adhesion force with the surface of a knife is reduced, and the surface smoothness of a test cake after trowelling is increased; when the cement paste reaches the final setting state (completely loses plasticity and begins to generate strength), the surface of the test cake is smeared by using wax paper, and the surface smoothness of the test cake is further improved.
(3) The test cake prepared by the invention has smooth surface, can avoid cracks caused by stress generated by uneven surface when the test cake is boiled, and can avoid the influence on the accuracy of an experimental result.
Drawings
FIG. 1 is a test cake obtained by removing a truncated cone from a cement paste on a coated glass plate, vibrating the test cake 10 times on a cement mortar fluidity tester, and troweling the test cake;
FIG. 2 is a test cake after secondary floating when the test cake is cured to an initial setting state in a constant temperature and humidity standard curing box;
FIG. 3 shows the test cake wiped with waxed paper after curing in a constant temperature and humidity standard curing box to a final set state.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the following detailed description will be given to the concrete implementation, features and effects of the cement stability test cake manufacturing method according to the present invention with reference to the accompanying drawings and preferred embodiments.
The invention firstly completes the mixing of cement paste and the measurement of the cement paste amount m contained in the truncated cone test model before the test cake is made. Wherein the mixing of the pure cement paste is completed by a pure cement paste mixer, and the pure cement paste with standard consistency is mixed on the pure cement paste mixer. The method for determining the net cement mortar amount m contained in the truncated cone test mold comprises the following steps: 1) Wiping the inner walls of the ungated glass plate and the truncated cone test mold by using wet cloth, then placing the ungated glass plate in the center of the table top of the cement mortar fluidity tester, placing the large end of the truncated cone test mold downwards in the center of the glass plate, and covering the truncated cone test mold and the glass plate by using the wet cloth so as to prevent the wiped water from drying in the shade. 2) The cement paste which can obviously fill the inner cavity of the truncated cone test mold is placed in a stainless steel tray, the side edge of the tray is placed on an experiment table, the upper part of the tray is supported by one hand, the cement paste is stirred for 15 times by a stirring knife with the width of 10mm along the inner side wall of the tray close to the experiment table by the other hand, the amount of the cement paste in the step can be properly adjusted according to different cement densities so as to ensure that the truncated cone test mold can be filled with the cement paste after the cement paste is vibrated and leveled in the truncated cone test mold, and 80g of the cement paste is taken in the invention. 3) Wrapping the cement paste stirred in the step 2) by using a stirring cutter, putting the cement paste into the truncated cone test mold, starting a cement mortar fluidity tester to vibrate for 50 times to enable the cement paste to fully fill the space in the truncated cone test mold, and scraping the excess cement paste on the surface of the truncated cone test mold from the center of the truncated cone test mold to two sides respectively. 4) Wiping off the outer surface of the truncated cone test mould and the excess cement paste on the glass plate, weighing the total mass m1 of the truncated cone test mould, the cement paste and the glass plate, and subtracting the total mass m2 of the truncated cone test mould and the glass plate wiped by wet cloth to obtain m.
After the net cement slurry amount m contained in the truncated cone test model is determined, the test cake is prepared through the following steps:
1) Firstly, wiping the inner wall of a truncated cone test mould and the surface of a non-coated glass plate by using wet cloth, putting the large end of the truncated cone test mould on the non-coated glass plate downwards, putting the non-coated glass plate on the table top of a cement mortar fluidity tester, covering the truncated cone test mould and the non-coated glass plate by using the wet cloth to prevent the truncated cone test mould and the non-coated glass plate from being dried in the shade, then weighing m +5g of cement paste with standard consistency and placing the cement paste into a material tray, placing the side edge of the material tray on an experimental table, holding the upper part of the material tray by one hand, stirring the cement paste along the inner side wall of the material tray close to the experimental table by using a stirring knife with the width of 10mm by the other hand, wrapping the cement paste by the stirring knife and placing the cement paste into the truncated cone test mould at one time, vibrating the truncated cone test mould on the cement mortar fluidity tester for 50 times, finally scraping the redundant cement paste on the surfaces of the truncated cone from the center on the top of the truncated cone test mould to two sides respectively, and wiping the redundant cement paste on the truncated cone test mould and the glass plate;
2) The truncated cone test mold filled with the cement paste obtained in the step 1) is translated to an oiled glass plate from the oiled glass plate, then the oiled glass plate and the truncated cone test mold are placed in the center of the table top of a cement mortar fluidity tester, the truncated cone test mold is removed, then the cement paste is vibrated for 10 times to be in a round cake shape (called as a test cake), and finally a trowel is used for trowelling the surface of the cement paste;
3) Placing the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box (the temperature is 19-21 ℃, and the humidity is 90-92 percent) for curing to an initial setting state, then taking out the glass plate and the test cake from the curing box, and using a trowelling knife to trowel the surface of the test cake for the second time, wherein at the moment, the cement paste begins to lose plasticity, and the adhesion force with a grinding knife becomes small; finally, placing the oiled glass plate and the test cake after secondary leveling into a constant-temperature constant-humidity standard curing box again for curing to a final setting state, wherein the cement paste completely loses plasticity and begins to generate strength;
4) And taking out the glass plate and the test cake in the final setting state from the curing box, wiping the surface of the test cake with wax paper to be smooth, continuously putting the glass plate coated with oil and the wiped test cake into a constant-temperature constant-humidity standard curing box, curing for 24 hours (timing from the contact of cement and water), and finally removing the glass plate to obtain the test cake with a smooth surface.
In the step 1) of making the test cake, the glass plate and the truncated cone test mold which are contacted with the cement paste with the standard consistency are only wiped by wet cloth and are not coated with oil, and the main reason is that in the step, when the cement paste with the standard consistency is filled in the truncated cone test mold, most of the cement paste is contacted with the inner wall of the truncated cone test mold and the glass plate, when the glass plate and the truncated cone test mold are coated with oil, the cement paste not only can easily take away the oil to influence the subsequent demolding, but also various performances of the cement paste mixed with the oil can be influenced, so that the accuracy of an experimental result is influenced. The truncated cone test mold is translated to the oiled glass plate after the cement paste is filled, and only the cement paste at the bottom is contacted with oil, so that the demolding requirement of the glass plate is met, and the influence of the oil is minimized.
The truncated cone test model is only convenient for the standardization of the use amount of cement paste and the standardization of the initial form of the test cake, and the truncated cone test model is removed and then is vibrated for a specified number of times on a cement mortar fluidity tester, so that the shape, the thickness and the like of the test cakes obtained by different people after vibration are basically the same, and the surface of the test cake is only required to be modified by a trowelling knife.
When the cement paste reaches the initial setting state, the trowelling knife is used for trowelling the surface of the test cake for the second time, the cement paste has plasticity, but the adhesion force of the cement paste and the grinding knife becomes small, so that the smoothness of the surface of the test cake is greatly increased after the surface of the test cake is trowelled in the state, and the convex edges on the surface of the test cake can be effectively reduced.
The surface of the test cake is wiped under the final setting state of the cement paste, so that the surface of the test cake can be smooth, and the test cake can be prevented from cracking due to stress generated by uneven surface when being boiled to influence the accuracy of an experimental result. And the test cake with smooth surface is easy to observe deformation such as surface cracks in experiments.
The present invention is illustrated in detail below by means of 4 examples.
In the embodiment of the invention, the truncated cone test mold is made of stainless steel, the diameter of the bottom is 40mm, the diameter of the upper opening is 30mm, the height is 35mm, and the wall thickness is 5mm; the sizes of the oiled glass plate and the ungated glass plate are 100 multiplied by 5mm, the diameter of the upper opening of the stainless steel material tray is 160mm, the diameter of the bottom of the stainless steel material tray is 100mm, and the height of the stainless steel material tray is 60mm. The stainless steel stirring knife has the following dimensions: 200 (length) × 10 (width) × 2 (thickness) mm. The stainless steel trowel has a size of 200 (length, wherein the handle is 100mm, the thickness at the handle is uniform, and is 2 mm) x 10 (width) x 2 (thickness on thick side) x 0.3 (thickness on thin side), and the amount of m in different embodiments is different due to the difference in cement density.
Example 1
(1) And (5) mixing the cement paste with the standard consistency on a cement paste mixer.
(2) And determining the net cement slurry amount contained in the truncated cone test mould to be 75g.
(3) Weighing 75+5g of cement paste with standard consistency, placing the side edge of a material tray on an experiment table, supporting the upper part of the material tray by one hand, stirring the cement paste for 15 times by a stirring knife with the width of 10mm along the inner side wall of the material tray close to the experiment table by the other hand, wrapping the cement paste by the stirring knife, placing the cement paste into a truncated cone test mold at one time, vibrating the truncated cone test mold on a cement mortar fluidity tester for 50 times, scraping the redundant cement paste on the surface of the truncated cone test mold towards two sides from the center on the truncated cone test mold, and wiping the redundant cement paste on the outer side of the truncated cone test mold and on a glass plate.
(4) The truncated cone test mold filled with the cement paste is translated from the unglazed glass plate to the glazed glass plate. Placing the oiled glass plate and the truncated cone test mould in the center of the table top of the cement mortar fluidity tester, removing the truncated cone test mould, opening the cement mortar fluidity tester, vibrating the cement paste for 10 times to make the cement paste be in a round cake shape (called a test cake), and using a trowelling knife to trowel the surface of the round cake-shaped cement paste.
(5) Placing the oiled glass plate and the test cake into a constant temperature and humidity standard curing box (the temperature is 19-21 ℃, and the humidity is 90-92%) to be cured to an initial setting state. And taking the glass plate and the test cake out of the curing box, and troweling the surface of the test cake for the second time. And putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box again for curing to a final set state.
(6) And taking out the glass plate and the test cake from the curing box, wiping the surface of the test cake with wax paper to be smooth, continuously putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box, curing for 24 hours (counting time from the contact of cement and water), and removing the glass plate to obtain the test cake with a smooth surface.
Example 2
(1) And (5) mixing the cement paste with the standard consistency on a cement paste mixer.
(2) The net amount of cement contained in the truncated cone test model was determined to be 77g.
(3) Weighing 77+5g of standard-consistency cement paste in a material tray, placing the side edge of the material tray on an experiment table, supporting the upper part of the material tray by one hand, stirring the cement paste for 15 times by a stirring knife with the width of 10mm along the inner side wall of the material tray close to the experiment table by the other hand, wrapping the cement paste by the stirring knife, placing the cement paste into a truncated cone test mold once, vibrating on a cement mortar fluidity tester for 50 times, and scraping the redundant cement paste on the surface of the truncated cone test mold from the center on the truncated cone test mold to two sides respectively. And wiping off the excess cement paste outside the truncated cone test mould and on the glass plate.
(4) The truncated cone test mold with the cement paste was translated from the ungated glass plate to the coated glass plate. The oiled glass plate and the truncated cone test model are placed in the center of the table top of the cement mortar fluidity tester, the truncated cone test model is removed, and the cement mortar fluidity tester is started to vibrate the cement paste for 10 times, so that the cement paste is in a round cake shape (called a test cake). And (5) smoothing the surface of the cement paste by using a smoothing knife.
(5) Placing the oiled glass plate and the test cake into a constant temperature and humidity standard curing box (the temperature is 19-21 ℃, and the humidity is 90-92%) to be cured to an initial setting state. And taking the glass plate and the test cakes out of the curing box, and troweling the surfaces of the test cakes for the second time. And putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box again for curing to a final set state.
(6) And taking out the glass plate and the test cake from the curing box, wiping the surface of the test cake with wax paper to be smooth, continuously putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box, curing for 24 hours (counting time from the contact of cement and water), and removing the glass plate to obtain the test cake with a smooth surface.
Example 3
(1) And (5) mixing the cement paste with the standard consistency on a cement paste mixer.
(2) The amount of cement paste contained in the truncated cone test model was determined to be 73g.
(3) Weighing 73+5g of standard-consistency cement paste in a material tray, placing the side edge of the material tray on an experiment table, supporting the upper part of the material tray by one hand, stirring the cement paste for 15 times by a stirring knife with the width of 10mm along the inner side wall of the material tray close to the experiment table by the other hand, wrapping the cement paste by the stirring knife, placing the cement paste into a truncated cone test mold at one time, vibrating the truncated cone test mold on a cement mortar fluidity tester for 50 times, and scraping the redundant cement paste on the surface of the truncated cone test mold towards two sides from the center on the truncated cone test mold. And wiping off the excess cement paste outside the truncated cone test mould and on the glass plate.
(4) The truncated cone test mold filled with the cement paste is translated from the unglazed glass plate to the glazed glass plate. The oiled glass plate and the truncated cone test model are placed in the center of the table top of the cement mortar fluidity tester, the truncated cone test model is removed, and the cement mortar fluidity tester is started to vibrate the cement paste for 10 times to make the cement paste be in a round cake shape (called a test cake). And (5) smoothing the surface of the cement paste by using a smoothing knife.
(5) Placing the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box (the temperature is 19-21 ℃, and the humidity is 90-92%) for curing to an initial setting state. And taking the glass plate and the test cakes out of the curing box, and troweling the surfaces of the test cakes for the second time. And putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box again for curing to a final setting state.
(6) And taking out the glass plate and the test cake from the curing box, wiping the surface of the test cake with wax paper to be smooth, continuously putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box for curing for 24 hours (timing from the contact of cement and water), and removing the glass plate to obtain the test cake with a smooth surface.
Example 4
(1) And (5) mixing the cement paste with the standard consistency on a cement paste mixer.
(2) The amount of cement net paste contained in the truncated cone test model was determined to be 79g.
(3) Weighing 79+5g of standard-consistency cement paste in a material tray, placing the side edge of the material tray on an experiment table, supporting the upper part of the material tray with one hand, stirring the cement paste for 15 times along the inner side wall of the material tray close to the experiment table with a stirring knife with the width of 10mm with the other hand, wrapping the cement paste with the stirring knife, placing the cement paste into a truncated cone test mold at one time, vibrating the truncated cone test mold for 50 times on a cement mortar fluidity tester, and scraping off the redundant cement paste on the surface of the truncated cone test mold from the center on the truncated cone test mold to two sides respectively. And wiping off the excess cement paste outside the truncated cone test mould and on the glass plate.
(4) The truncated cone test mold filled with the cement paste is translated from the unglazed glass plate to the glazed glass plate. The oiled glass plate and the truncated cone test model are placed in the center of the table top of the cement mortar fluidity tester, the truncated cone test model is removed, the cement mortar fluidity tester is started, and the cement paste is vibrated for 10 times to form a round cake shape (called a test cake). And (5) smoothing the surface of the cement paste by using a smoothing knife.
(5) Placing the oiled glass plate and the test cake into a constant temperature and humidity standard curing box (the temperature is 19-21 ℃, and the humidity is 90-92%) to be cured to an initial setting state. And taking the glass plate and the test cake out of the curing box, and troweling the surface of the test cake for the second time. And putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box again for curing to a final set state.
(6) And taking out the glass plate and the test cake from the curing box, wiping the surface of the test cake with wax paper to be smooth, continuously putting the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box, curing for 24 hours (counting time from the contact of cement and water), and removing the glass plate to obtain the test cake with a smooth surface.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A cement stability test cake preparation method, mix the cement paste of the standard consistency and confirm the cement paste amount m held in truncated cone test mould on the cement paste mixer at first, characterized by that, the preparation method of the cement stability test cake also includes the following steps:
1) Placing a truncated cone test mold smeared by wet cloth with the big head facing downwards on a non-oiled glass plate smeared by the wet cloth, placing the non-oiled glass plate in the center of a table top of a cement mortar fluidity tester, covering the truncated cone test mold and the non-oiled glass plate by the wet cloth, then weighing m +5g of standard-consistency cement paste, placing the side edge of a material plate on a test table, holding the upper part of the material plate by one hand, stirring the cement paste for 15 times along the inner side wall of the material plate close to the test table by the other hand by a stirring knife with the width of 10mm, wrapping the cement paste by the stirring knife once, placing the cement paste into the truncated cone test mold, vibrating the truncated cone test mold on the cement mortar fluidity tester for 50 times, finally scraping the redundant cement paste on the surfaces of the truncated cone test mold from the center on the truncated cone test mold to two sides respectively, and wiping off the outer surface of the truncated cone test mold and the redundant cement paste on the glass plate;
2) The truncated cone test mould is horizontally moved to the oiled glass plate from the oiled glass plate, then the oiled glass plate and the truncated cone test mould on the oiled glass plate are placed in the center of the table top of the cement mortar fluidity tester, after the truncated cone test mould is removed, the vibration is carried out for 10 times to make the cement paste on the oiled glass plate be in a round cake shape, the round cake is called as a test cake, and finally, a trowelling knife is used for trowelling the surface of the test cake;
3) Placing the oiled glass plate and the test cake into a constant-temperature constant-humidity standard curing box for curing to an initial setting state, taking out the oiled glass plate and the test cake from the curing box, and using a trowelling knife to trowel the surface of the test cake for the second time; then placing the oiled glass plate and the test cake after secondary floating into a constant temperature and humidity standard curing box for curing to a final setting state;
4) And taking the oiled glass plate and the test cake in the final set state out of the curing box, smearing the surface of the test cake with wax paper to be smooth, then continuously putting the oiled glass plate and the smeared test cake into a constant-temperature constant-humidity standard curing box for curing for 24 hours, and finally removing the oiled glass plate to obtain the test cake with a smooth surface.
2. The method for making cement stability test cakes according to claim 1, wherein: the temperature of the constant temperature and humidity standard curing box is 19-21 ℃, and the humidity is 90-92%.
3. The method for making a cement stability test cake as set forth in claim 1, wherein: the method for determining the net slurry amount m of the cement contained in the truncated cone test model comprises the following steps:
1) Smearing the oilless glass plate and the inner wall of the truncated cone test mold by using wet cloth, then placing the oilless glass plate in the center of a table top of a cement mortar fluidity tester, placing the large end of the truncated cone test mold downwards in the center of the glass plate, and covering the truncated cone test mold and the glass plate by using the wet cloth to keep the humidity of the truncated cone test mold and the glass plate;
2) Placing cement paste with standard consistency in a stainless steel tray, placing the side edge of the tray on an experiment table, holding the upper part of the tray with one hand, stirring the cement paste for 15 times along the inner side wall of the tray close to the experiment table with a stirring knife with the width of 10mm with the other hand, wrapping the cement paste with the stirring knife for one time, placing the wrapped cement paste into a truncated cone test mold, starting a cement mortar fluidity tester to vibrate for 50 times to enable the cement paste to fully fill the cavity of the truncated cone test mold, and scraping off excessive cement paste on the surface of the truncated cone test mold from the center of the upper part of the truncated cone test mold to two sides respectively;
3) Wiping off the outer surface of the truncated cone test mold and the excess cement paste on the glass plate, weighing the total mass m1 of the truncated cone test mold, the cement paste and the glass plate, and subtracting the total mass m2 of the truncated cone test mold and the glass plate wiped by wet cloth to obtain m.
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Effective date of registration: 20230412 Address after: 835100 Jieliangzi Pasture, Yingyeer Township, Yining City, Ili Kazakh Autonomous Prefecture, Xinjiang Uygur Autonomous Region Patentee after: Yili Yao Bai India Cements Ltd. Address before: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee before: Dragon totem Technology (Hefei) Co.,Ltd. Effective date of registration: 20230412 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Address before: 471003 No.8, Fenghua Road, high tech Zone, Luoyang City, Henan Province Patentee before: LUOYANG INSTITUTE OF SCIENCE AND TECHNOLOGY |