CN114988729B - Method for improving flexural strength of belite sulphoaluminate cement and application thereof - Google Patents

Method for improving flexural strength of belite sulphoaluminate cement and application thereof Download PDF

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CN114988729B
CN114988729B CN202210741016.2A CN202210741016A CN114988729B CN 114988729 B CN114988729 B CN 114988729B CN 202210741016 A CN202210741016 A CN 202210741016A CN 114988729 B CN114988729 B CN 114988729B
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sulphoaluminate cement
belite sulphoaluminate
flexural strength
belite
cement
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CN114988729A (en
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宋飞
赵宏伟
刘欢
刘清泉
彭美勋
梁家荣
马沁川
张海梅
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Hunan University of Science and Technology
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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
    • C04B7/00—Hydraulic cements
    • C04B7/32—Aluminous cements
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a method for improving the flexural strength of belite sulphoaluminate cement and application thereof, belongs to the technical field of building materials, and aims to solve the technical problem that the flexural strength of the existing belite sulphoaluminate cement is not high. The method uniformly mixes the dried activated alumina and the belite sulphoaluminate cement according to a certain mass ratio to prepare the belite sulphoaluminate cement with high flexural strength. According to the invention, the hydration process of the belite sulphoaluminate cement is influenced by regulating and controlling the technical parameters of the active alumina, the content and the characteristics of the alumina gel in a hydration product are changed, the structure of the slurry is further optimized, the flexural strength of the cementing material is improved, and the flexural resistance requirements of different use environments on the belite sulphoaluminate cement hardened slurry are met.

Description

Method for improving flexural strength of belite sulphoaluminate cement and application thereof
Technical Field
The invention relates to the technical field of building materials, in particular to a method for improving the flexural strength of belite sulphoaluminate cement and application thereof.
Background
The sulphoaluminate series cement has the excellent characteristics of rapid setting, low-temperature hardening, micro-expansion, freezing resistance, impermeability and the like, and is widely applied to glass fiber reinforced concrete, self-stress cement pressure pipes, ocean embankment engineering and other aspects. The belite sulphoaluminate cement developed on the basis not only inherits the advantages, but also can fully utilize various industrial waste residues in the production and hydration processes, and has the characteristics of novel green and low-carbon cementing materials. However, the belite sulphoaluminate cement has the defects of low flexural strength and even later strength shrinkage, and structural members such as beams and plates can be damaged under special conditions, so that the overall structure is damaged, and the life and property safety is threatened.
The common method for optimizing the performance of the belite sulphoaluminate cement is to add mixed materials such as limestone, slag and fly ash, but the low alkalinity environment of the belite sulphoaluminate cement slurry and the dilution effect of the mixed materials are not beneficial to the generation of secondary hydration products, so the method is easy to cause the reduction of the flexural strength of the hardened slurry. In addition, part of the research also adopts a method of adding an additive to optimize the performance of the belite sulphoaluminate cement. The publication number is: the CN105646874a patent discloses a belite sulphoaluminate cement reinforcing agent which, although it significantly improves the compressive strength of belite sulphoaluminate cement, does not increase the flexural strength much. The publication number is: the patent of CN104891839a discloses a method for improving early flexural strength (3 d) of belite cement by using nano indium oxide, but later strength may be reduced. Therefore, the method has important significance for exploring a new method for effectively improving the fracture resistance of the belite sulphoaluminate cement.
The belite sulphoaluminate cement hydration products are crystal hydrated calcium sulphoaluminate and alumina gel with low crystallinity, the performance optimization of the belite sulphoaluminate cement at present focuses on the growth of the hydrated calcium sulphoaluminate, and the prospect of the alumina gel in the aspect of performance development is not paid attention to. The specific surface area of the alumina gel with low crystallinity can reach 285m 2 The viscosity is larger, the increase of the content of the alumina gel in the slurry can improve the mechanical property of the sulphoaluminate cement stone (Chang Jun, AH, etc.) 3 And the effect of hydration on the strength of the sulphoaluminate cement, proceedings for building materials, 2016). However, the belite sulphoaluminate cement has a very limited amount of aluminium cement formed by hydration of the belite sulphoaluminate cement itself, which results in no significant improvement of the slurry properties. If the formation amount of the alumina gel in the belite sulphoaluminate cement slurry can be obviously increased, the performance of the hardened slurry can be improved. It is worth noting that the activated alumina used as the refractory material can be hydrated to form alumina gel, so that the alumina gel content in the belite sulphoaluminate cement slurry can be obviously increased by doping a proper amount of the activated alumina, and the fracture resistance of the hardened slurry is further improved.
The invention designs a method for improving the flexural strength of belite sulphoaluminate cement, which is characterized in that more activated alumina capable of being hydrated to form alumina gel is added into the belite sulphoaluminate cement, so that the slurry structure is optimized, and the improvement of the flexural resistance of the belite sulphoaluminate cement is realized.
Disclosure of Invention
The invention provides a method for improving the flexural strength of belite sulphoaluminate cement aiming at the problems in the prior art, and can solve the problem that the flexural strength of the belite sulphoaluminate cement is poor at present.
The invention provides belite sulphoaluminate cement with high breaking strength, which comprises the following raw material components in percentage by mass: 0.5 to 5.0 weight percent of active alumina and 95 to 99.5 weight percent of common belite sulphoaluminate cement.
Preferably, the specific surface area of the activated alumina is 150 to 300m2/kg.
Preferably, the common belite sulphoaluminate cement is a belite sulphoaluminate cement obtainable by conventional techniques or means, in particular a commercially available arctic bear belite sulphoaluminate cement.
Based on the above, the invention also provides a method for improving the flexural strength of the belite sulphoaluminate cement, which is characterized in that a proper amount of activated alumina is doped into the belite sulphoaluminate cement, so that the formation amount of alumina gel in hardened slurry is greatly increased, the slurry structure is further optimized, and the flexural strength of the hardened slurry is improved, and the method comprises the following steps:
s1, preparing active alumina fine powder: drying and grinding the activated alumina until the specific surface area is 150-300m < 2 >/kg, so as to obtain activated alumina fine powder;
s2, preparing the belite sulphoaluminate cement with high breaking strength: adding the fine active alumina powder into the belite sulphoaluminate cement, carrying out dry mixing in a mixer, and uniformly mixing to obtain the belite sulphoaluminate cement with high flexural strength, wherein the mass fraction of the active alumina in the belite sulphoaluminate cement with high flexural strength is 0.5-5.0%.
The invention also provides application of the method for improving the flexural strength of the belite sulphoaluminate cement in the field of preparation of sulphoaluminate series gelled materials. The mineral species of the belite sulphoaluminate cement and the sulphoaluminate cement are basically consistent, only the mineral content is different, so that the types of hydration products in the hardened slurry of the belite sulphoaluminate cement and the sulphoaluminate cement are similar, and only the product content is different, therefore, the method can also be popularized and applied to the sulphoaluminate cement.
According to the invention, a proper amount of activated alumina capable of being hydrated to form alumina gel is added into the belite sulphoaluminate cement, and the alumina gel added into the hardened slurry is beneficial to the improvement of the fracture resistance of the cement. Furthermore, the hydration process of the belite sulphoaluminate cement is influenced by controlling the technical parameters of the particle size distribution, the particle shape, the doping amount and the like of the activated alumina, the content and the characteristics of alumina gel in a hydration product are changed, the slurry structure is improved by matching with other products, the fracture resistance is improved, and the belite sulphoaluminate cement can better meet the actual application requirement.
The technical scheme of the invention has the following advantages:
1. the invention discloses a method for improving the flexural strength of belite sulphoaluminate cement, which changes the hydration process of belite sulphoaluminate cement by adding activated alumina capable of being hydrated to form alumina gel and improves the content of the alumina gel in a belite sulphoaluminate cement hydration product. The increased aluminum paste can not only perfect the paste structure, but also be beneficial to the improvement of the breaking strength.
2. Furthermore, the hydration process of the belite sulphoaluminate cement can be influenced by adjusting the technical parameters (particle size distribution, particle form, mixing amount and the like) of the activated alumina, the content and the characteristics of the alumina gel in the hardened slurry are greatly changed, the belite sulphoaluminate cement with different flexural strength can be obtained, and various requirements in practical application are further met.
3. The active alumina is mainly used for the production and manufacture of unshaped refractory materials at present, and the application of the active alumina in sulphoaluminate series gelled materials is not seen, so that the invention not only provides a new way for the performance optimization of the gelled materials, but also opens up a new field for the application of the active alumina.
4. Compared with the prior art, the invention provides a new idea for improving the flexural strength of the belite sulphoaluminate cement, and the technical means not only has the advantages of simple and feasible technical route, stable and good effect of improving the flexural strength, but also has important significance for popularizing the application of the activated alumina in the cementing material industry.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples and comparative examples. It should be noted that the reagents and apparatuses of the present invention are all commercially available products unless otherwise specified.
Example 1
According to the weight percentage of 0.5 percent of active alumina doped in the belite sulphoaluminate cement, 99.5g of belite sulphoaluminate cement and 0.5 g of active alumina are taken (the specific surface area is 300 m) 2 And/kg) are mixed evenly in a mixer, thus obtaining the belite sulphoaluminate cement with high breaking strength. The flexural strength of the cement mortar is determined according to the GB/T17671-1999 standard, and the results are shown in Table 1, and the effect of the activated alumina on improving the flexural strength is obvious.
Example 2
According to the weight percentage of 1.0 percent of active alumina doped in the belite sulphoaluminate cement, 99.0 grams of belite sulphoaluminate cement and 1.0 gram of active alumina (the specific surface area is 203 m) 2 Kg) and mixing evenly in a mixer to obtain the belite sulphoaluminate cement with high breaking strength. The flexural strength of the cement mortar is determined according to the GB/T17671-1999 standard, and the results are shown in Table 1, and the effect of the activated alumina on improving the flexural strength is obvious.
Example 3
According to the active alumina content of 3.0% in belite sulphoaluminate cement, 97.0g of belite sulphoaluminate cement and 3.0 g of active alumina (the specific surface area is 189 m) 2 And/kg) are mixed evenly in a mixer, thus obtaining the belite sulphoaluminate cement with high breaking strength. The flexural strength of the cement mortar is determined according to the GB/T17671-1999 standard, and the results are shown in Table 1, and the effect of the activated alumina on improving the flexural strength is obvious.
Example 4
According to the weight percentage of 5.0 percent of active alumina doped in the belite sulphoaluminate cement, 95.0 grams of belite sulphoaluminate cement and 5.0 grams of active alumina (specific surface area)Product of 150m 2 Kg) and mixing evenly in a mixer to obtain the belite sulphoaluminate cement with high breaking strength. The flexural strength of the cement mortar is determined according to the GB/T17671-1999 standard, and the results are shown in Table 1, and the effect of the activated alumina on improving the flexural strength is good.
Comparative example 1
The flexural strength of the belite sulphoaluminate cement mortar was determined according to the GB/T17671-1999 standard and the flexural strength of the hardened paste was not high, see Table 1.
Comparative example 2
According to the weight fraction of 0.1 percent of active alumina doped in the belite sulphoaluminate cement, 99.9 grams of belite sulphoaluminate cement and 0.1 gram of active alumina (the specific surface area is 189 m) 2 And/kg) are mixed evenly in a mixer, and the modified belite sulphoaluminate cement can be obtained. The flexural strength of the cement mortar is determined according to the GB/T17671-1999 standard, and the results are shown in Table 1, and the effect of improving the flexural strength performance by a small amount of activated alumina is not obvious.
Comparative example 3
According to the weight percentage of 10.0 percent of active alumina doped in the belite sulphoaluminate cement, 90.0 grams of belite sulphoaluminate cement and 10.0 grams of active alumina (the specific surface area is 203 m) 2 And/kg) are mixed evenly in a mixer, and the modified belite sulphoaluminate cement can be obtained. The flexural strength of the cement mortar was determined according to GB/T17671-1999 and the results are shown in Table 1, where a large amount of activated alumina would deteriorate the flexural strength properties.
Comparative example 4
According to the weight percentage of 0.5 percent of active alumina doped in the belite sulphoaluminate cement, 99.5g of belite sulphoaluminate cement and 0.5 g of active alumina (the specific surface area is 400 m) 2 Kg) and mixing evenly in a mixer to obtain the modified belite sulphoaluminate cement. The flexural strength of the cement mortar was measured according to GB/T17671-1999 and the results are shown in Table 1, wherein the activated alumina with a large specific surface area causes a slight decrease in the flexural strength performance.
Comparative example 5
According to the incorporation of belite sulphoaluminate cement0.5 percent of alumina, 99.5g of belite sulphoaluminate cement and 0.5 g of active alumina (the specific surface area is 100 m) 2 And/kg) are mixed evenly in a mixer, and the modified belite sulphoaluminate cement can be obtained. The flexural strength of the cement mortar is measured according to the GB/T17671-1999 standard, and the results are shown in Table 1, wherein the activated alumina with smaller specific surface area leads to the reduction of the early flexural strength performance and the slight increase of the later flexural strength performance.
Comparative example 6
According to the weight percentage of 0.5 percent of active alumina doped in the ordinary portland cement, 99.5g of the ordinary portland cement and 0.5 g of the active alumina (the specific surface area is 203m < 2 >/kg) are taken and evenly mixed in a mixer, and the modified portland cement can be obtained. The flexural strength of the portland cement mortar before and after modification was determined according to the GB/T17671-1999 standard, and the flexural strength of the hardened slurry was not significantly changed, as shown in Table 2.
Table 1: flexural Strength of the products of the comparative examples and examples
Figure BDA0003718000740000071
Figure BDA0003718000740000081
Table 2: flexural strength of portland cement
Categories Mass fraction of activated alumina 3d(MPa) 7d(MPa) 28d(MPa)
Ordinary portland cement 0％ 5.02 6.17 7.40
Comparative example 6 0.5％ 5.11 6.12 7.47
As can be seen from Table 1, the needle-like or plate-like hydrated calcium sulfoaluminate product in the belite sulphoaluminate cement slurry mainly plays a role of a skeleton, and the alumina gel with low crystallinity further fills the periphery of the hydrated calcium sulfoaluminate to densify the slurry structure, thereby being beneficial to improving the fracture resistance. However, the amount of the alumina gel formed by the hydration of the belite sulphoaluminate cement is limited, and the formation amount of the alumina gel in the hardened slurry can be obviously increased by doping the activated alumina which can be hydrated to form the alumina gel, so that the slurry structure is better perfected, and the breaking strength is improved. As can be seen from comparative examples 2-3, too little active alumina was added, the amount of alumina gel formed was small, the flexural strength was not significantly improved, and too much active alumina was added, which resulted in a sharp decrease in the amount of calcium sulfoaluminate hydrate that acted as a framework, and further deteriorated flexural strength. As can be seen from comparative examples 4 to 5, too coarse activated alumina particles hydrate more slowly, while too fine activated alumina particles hydrate more rapidly, which is not favorable for improving the fracture resistance. Furthermore, the hydration process of the belite sulphoaluminate cement is influenced by adjusting the technical parameters (particle size distribution, particle shape, mixing amount and the like) of the activated alumina, and the content and the characteristics of the alumina gel in the hardened slurry are obviously changed, so that the belite sulphoaluminate cement with different breaking strengths is obtained, and the specific requirements in practical application are met. As can be seen from comparative example 6, the addition of activated alumina to ordinary portland cement does not significantly improve the flexural strength, because the alumina gel does not exist stably in the portland cement and reacts to form the flaky crystalline hydrated gehlenite.
It should be understood that the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (2)

1. The belite sulphoaluminate cement with high flexural strength is characterized by comprising the following raw materials in percentage by mass: 0.5 to 5.0 weight percent of active alumina and 95 to 99.5 weight percent of common belite sulphoaluminate cement; the specific surface area of the activated alumina is 150-300m 2 /kg。
2. The belite sulphoaluminate cement of high flexural strength according to claim 1, characterised in that the preparation method comprises the following steps:
s1, preparing active alumina fine powder: drying and grinding active alumina to specific surface area of 150-300m 2 Per kg, obtaining active alumina fine powder;
s2, preparing the belite sulphoaluminate cement with high breaking strength: adding the active alumina fine powder into the common belite sulphoaluminate cement according to the mass percentage, and uniformly mixing in a mixer to obtain the belite sulphoaluminate cement with high flexural strength.
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CN110386805A (en) * 2019-08-22 2019-10-29 大连海事大学 A kind of new sulfur aluminate-base mud/soft soil curing agent and its application method
CN113416047A (en) * 2021-06-29 2021-09-21 中建材中岩科技有限公司 Sealing slurry for prefabricated building and preparation and use methods thereof

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102910852A (en) * 2012-10-24 2013-02-06 中建商品混凝土成都有限公司 Coagulant for super sulfate cement
CN110386805A (en) * 2019-08-22 2019-10-29 大连海事大学 A kind of new sulfur aluminate-base mud/soft soil curing agent and its application method
CN113416047A (en) * 2021-06-29 2021-09-21 中建材中岩科技有限公司 Sealing slurry for prefabricated building and preparation and use methods thereof

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AH3及水化程度对硫铝酸盐水泥强度的影响;常钧 等;《建筑材料学报》;20161231;第19卷(第6期);第1028-1032页 *

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