CN111323567A - Cement paste chemical shrinkage testing device and application thereof - Google Patents

Cement paste chemical shrinkage testing device and application thereof Download PDF

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Publication number
CN111323567A
CN111323567A CN202010181303.3A CN202010181303A CN111323567A CN 111323567 A CN111323567 A CN 111323567A CN 202010181303 A CN202010181303 A CN 202010181303A CN 111323567 A CN111323567 A CN 111323567A
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China
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cement
chemical shrinkage
wide
testing device
cement slurry
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CN202010181303.3A
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Chinese (zh)
Inventor
朱洪波
许亚飞
杨正宏
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Tongji University
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Tongji University
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Priority to CN202010181303.3A priority Critical patent/CN111323567A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38—Concrete; ceramics; glass; bricks
    • G01N33/383—Concrete, cement

Abstract

The invention relates to the field of testing devices, and discloses a cement slurry chemical shrinkage testing device, which is used for testing the chemical shrinkage of cement slurry and comprises: the wide-mouth bottle is used for containing cement paste; the frosted cover is arranged at the bottle mouth of the wide-mouth bottle and is provided with a hole; and the graduated tube is arranged in the hole in a penetrating way. The cement slurry chemical shrinkage testing device provided by the invention can be used for testing the chemical shrinkage of low-fluidity cement slurry, and has the advantages of easily available device materials, quickness in installation, good sealing property, simplicity in operation, reliable testing result and the like.

Description

Cement paste chemical shrinkage testing device and application thereof
Technical Field
The invention relates to the field of testing devices, in particular to a cement paste chemical shrinkage testing device and application thereof.
Background
The cement hardens after reaction with water, the volume of the hardened cement being reduced compared to its original solid phase and the total volume of water added, known as the chemical shrinkage of the cement. The cement chemical shrinkage process is closely related to the hydration reaction process, so that the hydration reaction process of the cement can be researched and analyzed by testing the change rule of the chemical shrinkage, for example, the faster the chemical shrinkage rate of the cement is, the larger the shrinkage amount is, the faster the reaction rate is, the higher the reaction degree is, the shorter the setting time is, the higher the early strength is, and the like. Meanwhile, the early chemical shrinkage is high in generation speed and large in shrinkage amount and is one of main factors causing shrinkage and cracking of the set cement, so that the risk of shrinkage and cracking of the cement can be evaluated through chemical shrinkage; for example, when the fly ash or the slag powder is added into the cement, the early chemical shrinkage amount is obviously reduced, the shrinkage rate is slowed down, and accordingly, the cement paste or the concrete added with the fly ash or the slag powder is not easy to shrink and crack, and the like. Therefore, the chemical shrinkage test of cement is very important for the related research of cement.
According to the traditional cement chemical shrinkage testing method in China, the liquid discharge method is adopted by taking the provisions of ASTM as reference, cement paste is put into a glass bottle, then a bottle opening is plugged by a cork or a rubber plug, a glass graduated tube is inserted into a small hole in the middle of the cork or the rubber plug, then water is injected into the wide-mouth bottle, a small amount of water is firstly added to be fully mixed with the cement, then the water is continuously added to the full scale of the glass graduated tube, and the chemical shrinkage of the added cement paste is expressed according to the change of the water level in the graduated tube recorded at different time. It was later discovered that most cork or rubber stoppers expand their own volume after being soaked in water and cause a change in the water level in the graduated tube, thereby affecting the accuracy of the above-described test method. Therefore, some designs adopt a small-opening specific gravity bottle to contain cement paste, and then the glass graduated tube is connected with the bottle opening in a hard mode so as to eliminate the influence of water swelling of a cork plug or a rubber plug and the like on a test result; other improved methods are as follows: in order to avoid the influence of the inner wall of the bottle on the cement shrinkage, cement paste is filled into the capsule and then put into the wide-mouth bottle; or the injector is used as a cement paste container, air bubbles can be quickly discharged after cement paste is filled in the injector, and the graduated tube is quickly connected through the needle of the injector, and the like. These methods have advantages of small test error and quick operation, but also have disadvantages of complicated operation and high consumption of test operation (requiring a large-capacity glass syringe and being usable only once).
The traditional method usually does not consider the influence of the water-cement ratio of cement paste on a test result, and the meaning of chemical shrinkage generally refers to the chemical shrinkage of cement under the condition of full hydration, so that water is usually adopted as a test medium during testing, and the hydration condition of the cement can be very full. However, with the requirement for controlling the accuracy of the cement hydration process becoming higher and higher, and the common application of the high-efficiency and ultra-high-efficiency water reducing agent, the water-cement ratio (the proportion of water in cement and other cementing materials such as fly ash and slag powder) of cement slurry in actual engineering is extremely low, for example, the actual water-cement ratio of ultra-high performance concrete (UHPC) which is currently popularized and applied is only 0.16-0.18, which is already lower than the theoretical water-cement ratio of 0.23 required for complete hydration of cement, and under the condition, the hydration reaction process of cement is greatly changed compared with that under the condition of high water-cement ratio. Therefore, the test requirement on the chemical shrinkage of the cement with the ultralow water-cement ratio is more and more strong, and the cement paste with the ultralow water-cement ratio and generally lower fluidity is difficult to be filled into a test bottle by adopting the prior art; in addition, if the volume change is observed through water, the mixed slurry with the ultralow water-to-cement ratio also has an influence on the water-to-cement ratio of the cement slurry to be tested, namely the chemical shrinkage of the cement obtained through the test is not the chemical shrinkage of the cement under the actual hydration condition. Therefore, a chemical shrinkage testing device specially aiming at the ultra-low fluidity cement paste and a using method thereof are designed.
Disclosure of Invention
The cement slurry chemical shrinkage testing device provided by the invention can be used for testing the chemical shrinkage of low-fluidity cement slurry, and has the advantages of simplicity in operation, reliability in operation, high testing speed and the like.
The embodiment of the invention provides a cement slurry chemical shrinkage testing device, which is used for testing the chemical shrinkage of cement slurry and comprises: the wide-mouth bottle is used for containing cement paste; the frosted cover is arranged at the bottle mouth of the wide-mouth bottle and is provided with a hole; the graduated tube is arranged in the hole in a penetrating way.
The cement slurry chemical shrinkage testing device provided by the invention can also have the following characteristics: wherein, the contact position of the frosted cover and the wide-mouth bottle is coated with sealant.
The cement slurry chemical shrinkage testing device provided by the invention can also have the following characteristics: wherein the sealant is vaseline or butter.
The cement slurry chemical shrinkage testing device provided by the invention can also have the following characteristics: wherein, the graduated tube is a glass tube or a plastic tube.
The cement slurry chemical shrinkage testing device provided by the invention can also have the following characteristics: wherein, the graduated flask passes through glue with dull polish lid and carries out sealed cooperation.
The application of the cement paste chemical shrinkage testing device comprises the following steps:
step 1, selecting a cement slurry chemical shrinkage testing device, filling a powder to be tested into a wide-mouth bottle, and then adding water and stirring to form cement slurry;
step 2, eliminating air bubbles in the cement paste;
step 3, adding liquid for auxiliary test;
step 4, coating a sealant at the mouth of the wide-mouth bottle, and mounting a frosted cover at the mouth of the wide-mouth bottle;
step 5, adding liquid for auxiliary testing into the wide-mouth bottle through the graduated tube until the liquid level reaches the top graduation of the graduated tube;
and 6, sequentially recording the liquid level change values in the graduated tube according to the set time nodes.
In the application of the cement paste chemical shrinkage testing device provided by the invention, the cement paste chemical shrinkage testing device also has the following characteristics: wherein, the liquid for auxiliary test is any one of engine oil, edible oil or silicone oil.
In the application of the cement paste chemical shrinkage testing device provided by the invention, the cement paste chemical shrinkage testing device also has the following characteristics: wherein the powder to be detected is any one of cement, a mixture of cement and fly ash and slag powder.
Action and Effect of the invention
According to the cement slurry chemical shrinkage testing device provided by the invention, a wide-mouth bottle is adopted to contain cement slurry; the frosted cover is arranged at the bottle mouth of the wide-mouth bottle and is provided with a hole; the graduated tube is arranged in the hole in a penetrating way, and when the chemical shrinkage of cement paste is tested, the powder to be tested is put into the wide-mouth bottle, and water is added and stirred into the cement paste; then discharging air bubbles in the cement paste, and eliminating measurement errors caused by the air bubbles; the wide-necked bottle is added with the liquid for the auxiliary test, the frosted cover is installed afterwards, the liquid for the auxiliary test is continuously filled into the wide-necked bottle through the scale tube until the liquid level height of the liquid is higher than the bottle cover, and finally, the liquid level change value in the scale tube is recorded in sequence according to the set time node, so that the result of the chemical shrinkage test of cement paste can be obtained, the cement paste during the test is in a relatively closed environment, the influence of external factors on the test process is reduced, and the device has the advantages of being easy to obtain the device material, quick to install, good in sealing performance, simple to operate, reliable in test result and the like.
Drawings
Fig. 1 is a schematic overall structure of a cement slurry chemical shrinkage testing device according to an embodiment of the invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is specifically described below by combining the embodiment and the attached drawings.
< example 1>
Fig. 1 is a schematic overall structure of a cement slurry chemical shrinkage testing device according to an embodiment of the invention.
As shown in fig. 1, the present embodiment provides a cement slurry chemical shrinkage testing device for testing the flowability of cement slurry, comprising: wide-necked bottle 1, dull polish lid 2 and graduated flask 3.
The wide-mouth bottle 1 is made of glass. The inside of the wide-mouth bottle 1 is a circular arc surface, so that the powdery substance to be detected and water can be conveniently mixed into cement paste. The mouth of the wide-mouth bottle 1 is trumpet-shaped.
The sanding cover 2 has a hole in the middle. The appearance of the grinding cover 2 is conical, and the grinding cover 2 is plugged at the opening of the wide-mouth bottle 1. To improve the seal between the jar 1 and the frosted cap 2, the frosted cap 2 requires petrolatum or butter, in this example petrolatum, at the mouth of the jar 1 prior to installation. The frosted cover 2 is made of quartz material.
The graduated tube 3 is a transparent glass tube or a transparent plastic tube with scales, wherein the scales of 0 are positioned at the top end of the graduated tube 3, so that a tester can conveniently record the height of the liquid level in the graduated tube 3. The graduated tube 3 wears to establish downtheholely, and its bottom parallels with the bottom surface of dull polish lid 2, consequently can discharge the air in the wide-necked bottle 1 when filling the liquid of helping the test, eliminates the influence of air to experimental data. The height of the graduated tube 3 depends on the volume of the jar 1. The larger the volume of the jar 1 is, the larger the volume in the graduated tube 3 above the frosted cover 2 is, and in this embodiment, one 250mL jar 1 and one graduated tube 3 with a measuring range of 5mL are taken.
In this embodiment, the graduated tube 3 and the dull polish lid 2 can be installed through following steps, at first burn through a hole with 3 diameter looks adaptations of graduated tube on dull polish lid 2, then wear to establish graduated tube 3 in the mounting hole with dull polish lid 2 rigid connection, seal graduated tube 3 and dull polish lid 2 through glue at last.
< example 2>
The application of the cement slurry chemical shrinkage testing device provided by the embodiment comprises the following steps:
step 1, selecting a cement paste chemical shrinkage testing device, putting 200g of cement into a wide-mouth bottle 1, mixing 2g of powdery polycarboxylic acid water reducing agent and 36g of water, adding the mixture into the wide-mouth bottle 1, and mixing the mixture with the cement, wherein the water-cement ratio of the cement paste is 0.18. Stretching a stirring paddle of an electric stirrer into the cement in the wide-mouth bottle 1, and starting the stirrer to uniformly stir the cement paste 4; the stirring paddle is pulled out, and the cement paste adhered to the stirring paddle is carefully peeled off and falls into the wide-mouth bottle 1. The cement slurry chemical shrinkage test apparatus used in this step was the cement slurry chemical shrinkage test apparatus provided in example 1.
Step 2, repeatedly vibrating the wide-mouth bottle 1 on a table top padded with a towel or a rubber pad to empty bubbles in cement paste;
step 3, pouring soybean oil from the mouth of the wide-mouth bottle 1 to a position 1mm-3mm below the frosted mouth of the wide-mouth bottle 1;
step 4, uniformly coating vaseline on the side wall of the jar 1, and then covering the frosted cover 2 on the opening of the jar 1 and tightly plugging the frosted cover;
step 5, adding soybean oil 5 into the wide-mouth bottle 1 through the graduated tube 3 until the liquid level reaches the 0 scale at the top end of the graduated tube 3;
and 6, starting timing from the first time of adding water into the wide-mouth bottle 1 and contacting with cement paste, and recording scale values of the oil level in the glass scale tube at 0.5h, 1h, 2h, 3h, 4h, 5h, 6h, 12h, 24h, 36h, 48h, 72h and the like in sequence to obtain the chemical shrinkage values of 200g of cement paste in different hydration reaction times.
< example 3>
The application of the cement slurry chemical shrinkage testing device provided by the embodiment comprises the following steps:
step 1, selecting a cement slurry chemical shrinkage testing device, putting 90g of cement, 10g of silica fume and 18g of aqueous solution containing 1g of polycarboxylic acid powder water reducing agent into a wide-mouth bottle 1, and mixing and uniformly stirring the cement, the silica fume and the 18g of aqueous solution containing 1g of polycarboxylic acid powder water reducing agent by a stirring paddle of a stirrer; the stirring paddle is pulled out, and the cement paste adhered to the stirring paddle is carefully peeled off and falls into the wide-mouth bottle 1. The grout chemical shrinkage test apparatus used in this step is substantially the same as the grout chemical shrinkage test apparatus provided in example 1, except that the volume of the jar in this example is 100 mL;
step 2, repeatedly vibrating the wide-mouth bottle 1 on a table top padded with a towel or a rubber pad to empty bubbles in cement paste;
step 3, pouring the rapeseed oil from the mouth of the wide-mouth bottle 1 to a position 1mm-3mm below the frosted mouth of the wide-mouth bottle 1;
step 4, uniformly coating butter on the side wall of the jar 1 cover, and then covering the frosted cover 2 on the jar 1 opening and tightly plugging;
step 5, adding rapeseed oil 5 into the wide-mouth bottle 1 through the upper port of the graduated tube 3 until the liquid level reaches the 0 scale at the top end of the graduated tube 3;
and 6, starting timing from the first time of adding water into the wide-mouth bottle 1 and contacting with the cement paste, and recording scale values of the oil level in the glass scale tube at 0.5h, 1h, 2h, 3h, 4h, 5h, 6h, 12h, 24h, 36h, 48h, 72h and the like in sequence to obtain the chemical shrinkage values of the cement paste in different hydration reaction times.
Effects and effects of the embodiments
According to the grout chemical shrinkage testing arrangement that this embodiment provided, adopt the wide-necked bottle as the container of grout during the test, have that the device material is easy, the installation is swift, the leakproofness is good, advantages such as easy operation, test result are reliable.
Further, according to the cement paste chemical shrinkage testing device provided by the invention, the frosted cover is made of quartz materials, so that the volume of the frosted cover cannot expand after the frosted cover is contacted with the edible oil when the cement paste is subjected to a chemical shrinkage test, the frosted cover cannot cause water level change in the graduated tube, the testing system error can be reduced, and the data accuracy is improved.
Further, according to the cement paste chemical shrinkage testing device provided by the invention, as the contact position of the sanding cover and the wide-mouth bottle is coated with the sealant, the inaccuracy of data caused by edible oil leakage can be prevented.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims (8)

1. A cement slurry chemical shrinkage testing device for testing the chemical shrinkage of cement slurry, comprising:
the wide-mouth bottle is used for containing the cement paste;
the frosted cover is arranged at the bottle mouth of the wide-mouth bottle and is provided with a hole;
the graduated tube is provided with graduations and penetrates through the hole.
2. A cement slurry chemical shrinkage testing device as claimed in claim 1, wherein:
wherein the contact position of the frosted cover and the wide-mouth bottle is coated with sealant.
3. A cement slurry chemical shrinkage testing device as claimed in claim 2, wherein:
wherein the sealant is petrolatum or butter.
4. A cement slurry chemical shrinkage testing device as claimed in claim 1, wherein:
wherein, the graduated tube is a glass tube or a plastic tube.
5. A cement slurry chemical shrinkage testing device as claimed in claim 1, wherein:
wherein, the scale pipe seals the cooperation through glue with dull polish lid.
6. The application of the cement paste chemical shrinkage testing device is characterized by comprising the following steps:
step 1, selecting a cement paste chemical shrinkage testing device as claimed in any one of claims 1 to 5, filling a powder to be tested into the wide-mouth bottle, and then adding water and stirring to form the cement paste;
step 2, eliminating air bubbles in the cement paste;
step 3, adding liquid for auxiliary test;
step 4, smearing the sealant at the mouth of the wide-mouth bottle, and installing the frosted cover at the mouth of the wide-mouth bottle;
step 5, adding liquid for auxiliary testing into the wide-mouth bottle through the graduated tube until the liquid level reaches the top graduation of the graduated tube;
and 6, sequentially recording the liquid level change values in the graduated tube according to the set time nodes.
7. Use of a cement slurry chemical shrinkage test device according to claim 6, characterized in that:
wherein, the liquid for auxiliary test is any one of engine oil, edible oil or silicone oil.
8. Use of a cement slurry chemical shrinkage test device according to claim 6, characterized in that:
wherein, the powder to be detected is any one of cement, a mixture of cement and fly ash and slag powder.
CN202010181303.3A 2020-03-16 2020-03-16 Cement paste chemical shrinkage testing device and application thereof Pending CN111323567A (en)

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Application Number Priority Date Filing Date Title
CN202010181303.3A CN111323567A (en) 2020-03-16 2020-03-16 Cement paste chemical shrinkage testing device and application thereof

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Application Number Priority Date Filing Date Title
CN202010181303.3A CN111323567A (en) 2020-03-16 2020-03-16 Cement paste chemical shrinkage testing device and application thereof

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CN111323567A true CN111323567A (en) 2020-06-23

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Publication number Priority date Publication date Assignee Title
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CN101482487A (en) * 2009-02-12 2009-07-15 同济大学 Test method and test device for chemical contraction of cement
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Application publication date: 20200623