CN111606636B - Preparation method of early-strength glutinous rice mortar material - Google Patents
Preparation method of early-strength glutinous rice mortar material Download PDFInfo
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- CN111606636B CN111606636B CN202010418142.5A CN202010418142A CN111606636B CN 111606636 B CN111606636 B CN 111606636B CN 202010418142 A CN202010418142 A CN 202010418142A CN 111606636 B CN111606636 B CN 111606636B
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- glutinous rice
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
- C04B40/0236—Carbon dioxide post-treatment of already hardened material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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- Ceramic Engineering (AREA)
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Abstract
The invention discloses a preparation method of an early-strength glutinous rice mortar material, which comprises the following steps of mixing, pouring, demoulding, predrying, moisture homogenizing and the like according to the relative proportions of 100 parts of calcium hydroxide powder, 40-70 parts of gelatinized glutinous rice pulp and 30-60 parts of water, and then carrying out CO pretreatment on the mixture2Curing and hardening are carried out in the atmosphere to obtain the early strength type glutinous rice mortar hardened body. The invention has simple process and low operation difficulty, can obtain the high-early-strength glutinous rice mortar in a short time, solves the problem of slow development of the strength of the glutinous rice mortar, and provides a novel and efficient method for the practical application of the glutinous rice mortar.
Description
Technical Field
The invention belongs to the field of building materials, relates to a technology for modifying a glutinous rice mortar material, and particularly relates to a preparation method of an early-strength glutinous rice mortar material.
Background
The scholars find that the existing ancient buildings in China mostly use the glutinous rice mortar as a binder, such as ancient city walls of Nanjing, Xian, Kaifeng and the like, and are still very firm nowadays, which can prove that the glutinous rice has excellent performance as the admixture for the building materials. Glutinous rice mortar has become a mature technology in about the south-north direction, and the glutinous rice mortar is mixed with aged lime according to a certain proportion, so that the bonding strength, the surface hardness and the seepage resistance of the lime can be increased, and the durability of a building is obviously improved. However, the sticky rice mortar is gradually eliminated due to the fact that the sticky rice mortar cannot meet the requirements of modern building engineering more and more due to the complex process, the slow curing speed, the slow strength increasing speed and the like.
In the field of ancient building restoration, cement materials are used initially, but because the cement materials are poor in compatibility with the ancient buildings, the ancient buildings and the cement can be peeled off after a plurality of weeks of restoration by using the cement. In addition, the Chinese historical relic and historical relic protection criterion is emphasized in the section of trimming and repairing: "dressing should preferably use conventional techniques. Therefore, for the ancient architecture restoration in China, the glutinous rice mortar with better compatibility with the ancient architecture in China is obviously most suitable.
At present, a large number of scholars research the sticky rice mortar, and repair examples exist, such as the improved sticky rice mortar used in ancient building maintenance and protection projects like Deqing shouchang bridge, Hangzhou Xiangjie Temple stone tower and the like, in the Wenzhou City Guzhen Tata maintenance project, the novel sticky rice mortar which is provided by Zhejiang cultural relic protection material laboratory and can be used immediately is used, and lime aging and sticky rice gelatinization are completed in factories, so that the sticky rice mortar is simpler and more convenient in use process. However, it is not difficult to find in the repair works that have been completed so far and in the published articles on the glutinous rice mortar that the strength of the glutinous rice mortar is slowly increased as the most important reason why the glutinous rice mortar cannot be adapted to the present architectural characteristics. The compression strength of the natural carbonized glutinous rice mortar for 6 months was 0.94 MPa. However, in view of the prior art preference for repairing cultural relics, it is necessary to improve and perfect the problem of slow development of strength and prepare an early strength type glutinous rice mortar.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an early strength type glutinous rice mortar material based on modified glutinous rice mortar and accelerated carbonation and a preparation method thereof, so that the problems of the strength and the strength increase speed of the glutinous rice mortar are greatly improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of an early strength glutinous rice mortar material is characterized by comprising the following steps:
step 1, sticky rice mortar preparation: the raw materials in parts by mass are as follows:
100 portions of calcium hydroxide powder
40-70 parts of gelatinized glutinous rice pulp
30-60 parts of water
Uniformly mixing and stirring gelatinized glutinous rice pulp, water and calcium hydroxide powder in a fixed proportion to obtain a glutinous rice mortar mixture;
step 2, pouring and forming: pouring the sticky rice mortar mixture into a mould, standing at normal temperature for 36-42h, and demoulding to obtain a sticky rice mortar hardened body;
step 4, homogenization: sealing and homogenizing the dried and pretreated glutinous rice mortar hardened body;
step 5, accelerating carbonation: subjecting homogenized glutinous rice mortar to CO treatment2Curing in an atmosphere to obtain an early strength carbonized and hardened glutinous rice mortar.
Further, in step 4, air-blast drying treatment is performed at 65 to 80 ℃ during drying treatment.
Further, in step 5, the pre-dried hardened body of the glutinous rice Hujiang is subjected to a moisture homogenization treatment in the slurry, specifically, the hardened body of the glutinous rice slurry after the pre-drying treatment is stored in a sealed state for a certain period of time, so that the moisture in the hardened body of the glutinous rice slurry is homogenized.
Preferably, in the step 1, the solid content of the gelatinized glutinous rice paste is 3 to 12 percent.
Preferably, in step 1, the mass-to-solid mass ratio of water in the glutinous rice mortar, i.e., the water-solid ratio, is not less than 0.8.
Preferably, in the step 3, the water content of the dried glutinous rice mortar is 20 to 50% by mass.
Preferably, in step 4, the time for the moisture-homogenizing treatment of the dried glutinous rice mortar in the mortar is 2 to 4 hours.
Preferably, in step 5, the CO is2The concentration is more than 20%.
Preferably, in step 5, the glutinous rice mortar is subjected to CO2The curing process is carried out in a normal-pressure non-closed environment.
It is preferable thatAnd in step 5, CO of the glutinous rice mortar2The curing time is 4-7 hours.
An early strength glutinous rice mortar material, which is characterized in that: the early strength glutinous rice mortar material is prepared by any one of the preparation methods of the early strength glutinous rice mortar material.
The invention has the beneficial effects that:
the modified glutinous rice mortar and the accelerated carbonation technology of the invention prepare the early strength glutinous rice mortar material, reduce the water content of the glutinous rice mortar through drying pretreatment, and carry out homogenization treatment on the mortar sample subjected to the pre-drying treatment, thereby greatly improving the curing speed and the strength increasing speed of the glutinous rice mortar, leading the glutinous rice mortar to reach or approach the curing speed of common cement, filling up the material defects of the glutinous rice mortar, further exerting the advantages of the glutinous rice mortar material, and being possible to be practically applied in engineering. The invention has simple process and low operation difficulty, can obtain the high-early-strength glutinous rice mortar in a short time, and solves the problem of slow development of the strength of the glutinous rice mortar.
Drawings
FIG. 1 is an SEM photograph of a lime mortar after accelerated carbonation, wherein the calcium carbonate produced is mostly vaterite and the internal pores are large.
Fig. 2 is an SEM photograph of the early strength glutinous rice mortar containing 3% of glutinous rice after carbonation, and it can be seen that in the presence of gelatinized glutinous rice with a proper amount, calcium carbonate generated from the early strength glutinous rice mortar is in a calcite crystal form, which is significantly smaller in particle size and regularly arranged than calcium carbonate generated from lime mortar, and the porosity of the sample is greatly reduced.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides 7 examples and 8 comparative examples, wherein the steps of the 7 examples and the 8 comparative examples are completely the same, the parameters are different, the specific process parameters are detailed in tables 1 and 2, and the specific method is as follows:
1. preparation of glutinous rice mortar
Weighing certain mass of hydrated lime (calcium hydroxide), gelatinized glutinous rice pulp and water, firstly mixing and stirring the gelatinized glutinous rice pulp and the water uniformly, then mixing the calcium hydroxide with the gelatinized glutinous rice pulp, and stirring for 5 minutes at a speed of 500r/min until the glutinous rice pulp is stirred uniformly to obtain the glutinous rice mortar mixture. The proportions of hydrated lime, gelatinized glutinous rice pulp and water are shown in tables 1 and 2.
2. Curing of glutinous rice mortar
Pouring the prepared glutinous rice mortar into a 40 x 40mm mould, pouring and forming, placing into an environment with the temperature of 25 +/-10 ℃ and the RH of 95 +/-5 percent for curing, wherein the initial setting time is 36h, and demoulding to obtain the glutinous rice mortar hardened body.
3. Drying pretreatment
After the sticky rice mortar hardened body is demoulded, the sticky rice mortar hardened body is placed into a forced air drying oven to be dried for a period of time, the sticky rice mortar hardened body is dried at high temperature by adopting a forced air blower, and the drying time and the drying temperature are detailed in tables 1 and 2.
4. Homogenization of water content in mortar
Sealing and storing the cured glutinous rice mortar after drying pretreatment for more than 2h until the temperature of the cured glutinous rice mortar is reduced to room temperature, so that the water in the cured glutinous rice mortar is completely homogenized.
5. Carbonation
Placing the homogenized glutinous rice mortar hardened body in a container, communicating with atmosphere, and using CO with concentration of 99%2Curing the glutinous rice mortar for a total time of 4 hours to obtain an early strength type carbonized-hardened glutinous rice mortar.
6. Examination of the Properties of the early Strength type Oryza Glutinosa mortar
And (3) putting the early-strength glutinous rice mortar carbonized hardened body into a drying oven for drying for 15-18h until the weight is not reduced any more, calculating the weight gain rate, and testing the compressive strength. As the service life is prolonged, the non-carbonized part of the hardened body of the mortar of glutinous rice is continuously carbonized, and the strength thereof continues to increase.
Comparative example the examples 1 to 7 were followed, except that the parameters shown in Table 2 were varied.
The parameters and effects of examples 1 to 7 using the above method are detailed in Table 1, and those of comparative examples 8 to 15 are detailed in Table 2.
Table 1 shows the parameters of the 7 examples and the compressive strength of the materials prepared
Table 2 shows the parameters of 8 comparative examples and the compressive strength of the materials prepared
As can be seen from a comparison of the data in tables 1 and 2, the prepared gelatinized glutinous rice slurry should have a solid content of more than 3%, and if less than 3%, it will result in poor cohesiveness of the glutinous rice slurry; the liquid-solid ratio is required to be more than 0.8 when the sticky rice mortar is prepared, and if the liquid-solid ratio is less than 0.8, the prepared sticky rice mortar has extremely poor working performance; since a large amount of water is not favorable for increasing the carbonation degree of the glutinous rice mortar, the hardened body of the glutinous rice mortar needs to be dried before carbonation, the water content is controlled to be 20-50%, and if the residual water content is not in the range, the strength of the hardened body of the glutinous rice mortar obtained is extremely low; the sticky rice mortar hardened body is pre-dried and then sealed and homogenized for 2-4h, so that the fully homogenized sticky rice mortar hardened body is easier to carbonate, the carbonized early-strength sticky rice mortar carbonized hardened body is more uniform, if the carbonized early-strength sticky rice mortar carbonized hardened body is not homogenized or the homogenization time is less than 2h, the carbonation is difficult to carry out, the carbonized hardened body is extremely non-uniform, and a completely non-carbonized area can be generated seriously; in the case of a cured body CO of a mortar of glutinous rice2During maintenance, CO with the concentration of more than 20 percent is used2High concentration of CO2Can effectively shorten the curing time, and make the hardened body of the glutinous rice mortar have the service strength in a short time, if CO is used2The concentration is lower than 20%, the carbonization degree of the sticky rice mortar hardened body is extremely low within a certain carbonization time, and the carbonization time is prolonged to optimize the performance of the sticky rice mortar hardened body; subjecting a hardened body of a glutinous rice mortar to CO treatment2During the curing process, the hardened glutinous rice mortar is required to be in a normal-pressure airtight environment, a large amount of water vapor is generated in the reaction, and excessive water blocks gaps and blocks gapsCO stopping2The pressure resistance of the carbonized and hardened body of the glutinous rice mortar is reduced by diffusion to the inside, a large amount of generated water vapor is exchanged with the atmosphere in a non-closed environment and is rapidly diffused, the water vapor content of the environment around the carbonized and hardened body of the glutinous rice mortar is reduced, the condition is obviously improved, and CO is used2The good diffusion into the glutinous rice mortar hardened body, the carbonization depth and the compressive strength are improved, which is one of the advantages of the method in engineering application.
Ca (OH) is generated in the process of carbonizing the hardened glutinous rice mortar2+CO2+H2O→CaCO3+2H2The calcium hydroxide expands in volume through O reaction, and the volume of the calcium hydroxide can be increased by about 10% under the process, namely the sticky rice mortar structure becomes more compact; furthermore, it was found from SEM that the cured body of the mortar was CO2After curing, a large amount of calcite-type nano calcium carbonate is generated, as shown in fig. 2. This is an important reason why the method provides the early strength type glutinous rice mortar with higher strength.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (3)
1. A preparation method of an early strength glutinous rice mortar material is characterized by comprising the following steps:
step 1, sticky rice mortar preparation: the raw materials in parts by mass are as follows:
100 portions of calcium hydroxide powder
40-70 parts of gelatinized glutinous rice pulp
30-60 parts of water
Uniformly mixing and stirring gelatinized glutinous rice pulp, water and calcium hydroxide powder in a fixed proportion to obtain a glutinous rice mortar mixture;
step 2, pouring and forming: pouring the sticky rice mortar mixture into a mould, standing at normal temperature for 36-42h, and demoulding to obtain a sticky rice mortar hardened body;
step 3, drying pretreatment: drying the sticky rice mortar hardened body;
step 4, homogenization: sealing and homogenizing the dried and pretreated glutinous rice mortar hardened body;
step 5, accelerating carbonation: homogenizing the homogenized glutinous rice mortar in CO2Curing in the atmosphere to obtain an early strength type carbonized hardened body of the glutinous rice mortar;
in the step 3, the moisture mass content of the pre-dried sticky rice mortar hardened body is 20-50%;
in the step 1, the solid content of the gelatinized glutinous rice slurry is 3-12%, and the mass ratio of water to solid in the glutinous rice slurry, namely the water-solid ratio is not less than 0.8;
in the step 4, the time for homogenizing the water content of the pre-dried sticky rice mortar hardened body is 2-4 hours;
in step 5, CO is carried out2CO during curing2The concentration is more than 20%.
2. The method for preparing an early strength type glutinous rice mortar material according to claim 1, wherein: in step 5, the hardened body of the mortar of glutinous rice is subjected to CO2The curing process is carried out in a normal-pressure non-closed environment.
3. The method for preparing an early strength type glutinous rice mortar material according to claim 1, wherein: step 5, CO of the hardened body of the glutinous rice mortar2The curing time is 4-7 hours.
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| CN112390600A (en) * | 2020-11-03 | 2021-02-23 | 湖南写生绿色建筑科技有限公司 | Composite sound-insulation heat-insulation aerogel soil and preparation method thereof |
| CN113402243A (en) * | 2021-06-23 | 2021-09-17 | 武汉理工大学 | Method for improving durability of concrete product by using carbonized coating |
| CN114231065B (en) * | 2021-12-21 | 2022-12-02 | 湖北工业大学 | In-situ accelerated carbonation lime-based coating and preparation and use methods thereof |
| CN114276099B (en) * | 2021-12-21 | 2023-03-28 | 湖北工业大学 | High-strength composite starch mortar material capable of accelerating carbonation and preparation method thereof |
| CN114960538A (en) * | 2022-05-25 | 2022-08-30 | 浙江省钱塘江管理局勘测设计院 | Glutinous rice mortar paving construction method |
| CN115259812A (en) * | 2022-07-15 | 2022-11-01 | 浙江大学 | Formula of four-in-one soil and in-situ remediation method for soil ruins |
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