CN115636647B - Concrete based on micro-nano components and preparation method thereof - Google Patents
Concrete based on micro-nano components and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 33
- 239000002086 nanomaterial Substances 0.000 claims abstract description 28
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 17
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 15
- 239000002253 acid Substances 0.000 claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 12
- 239000002114 nanocomposite Substances 0.000 claims description 12
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000002041 carbon nanotube Substances 0.000 claims description 11
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 11
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002109 single walled nanotube Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002048 multi walled nanotube Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 18
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 4
- 238000011049 filling Methods 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 239000005543 nano-size silicon particle Substances 0.000 description 9
- 238000006703 hydration reaction Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000036571 hydration Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
Classifications
-
- 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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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses concrete based on micro-nano components and a preparation method thereof, belonging to the technical field of concrete, and comprising the following raw materials in parts by weight: 45-58 parts of cement; 95-110 parts of machine-made sand; 200-220 parts of stones; 25-45 parts of water; 4-7 parts of silica fume; 0.8-1.5 parts of polycarboxylic acid water reducer; 0.4-0.6 parts of micrometer material; 1.2-1.5 parts of nano material; 0.04-0.08 of dispersant. The three nano materials in the application can better exert the synergistic optimization of the nano material activity effect, the filling effect and the crystal nucleus effect, improve the interface performance, and greatly improve the performance of the cementing material so as to meet the requirements of great engineering and severe environment on high durability.
Description
Technical Field
The application relates to the technical field of concrete, in particular to concrete based on micro-nano components and a preparation method thereof.
Background
The reasons for the degradation or destruction of the cement concrete in service include various factors including physical action (freeze thawing cycle, dry-wet alternation and temperature change, etc.) and chemical action (environmental medium corrosion, carbonization, alkali aggregate reaction, steel bar corrosion, etc.) and their coupling action, but the root causes are poor structural uniformity and low compactness of the traditional cement concrete. Poor structural uniformity is easy to cause uneven stress distribution of the concrete material under the action of load or environmental factors; low solidity tends to result in materials with poor resistance to permeation, corrosion and freezing, i.e., reduced durability. Meanwhile, the composition and stability of hydration products of cement-based materials are also an important factor affecting the durability of concrete, and certain components can erode under special environments, and further cause destabilization and decomposition of other hydration products, particularly gel, so that the structure gradually becomes loose until collapsing.
Cement concrete materials are multi-scale, multi-component composite materials. The development process of the concrete performance is also a composition and structure optimization process, and along with the application of the mineral powder with the size of micron in the cement-based material, the material structure is obviously optimized, and the durability is obviously improved. However, with the construction of important projects or projects under severe conditions concerning national life and national defense safety, higher demands are put on the durability and the safe service period of concrete. However, the current cement-based materials do not meet the requirements and expectations of such engineering well, and further improvement of the performances is needed, and the composition and structure of the cement-based materials are needed to be optimized and regulated at a more microscopic scale. The nanomaterial is an ultrafine material having a particle size of nano-scale (1 to 100 nm), and the particle size is larger than that of the atomic cluster particles, smaller than that of the ordinary micro-powder particles, and is located in a transition region between the atomic cluster and the micro-particles. With the continuous superfine size of the substance, the surface electronic structure and the crystal structure of the substance change, and many special performances which macroscopic substances do not have, such as small-size effect, surface effect, quantum granulating effect and macroscopic quantum tunneling effect, are generated. Based on the special properties of the nano materials and the continuous development of cement concrete science, how to introduce the nano materials into the concrete materials greatly improves the properties of the nano materials, and gradually becomes a research hot spot in the field of cement concrete.
The prior auxiliary cementing material has poor early pozzolanic activity effect, so that the early compactness of the cement concrete is low, the strength of the cement concrete is reduced, the early chloride ion permeation resistance and carbonization resistance are also greatly reduced, and the early shrinkage resistance is also reduced.
On the other hand, since the particles of the supplementary cementitious material remain coarse, the micro aggregate filling effect and the nucleation effect remain poor. The regulation and optimization of the gel structure and the performance in the nanometer scale to obtain the gel with high performance is a necessary path for greatly improving the mechanics and the durability of the cementing material.
Disclosure of Invention
In view of the above, the application provides the concrete based on the micro-nano component, which can obviously improve the strength of the concrete, prevent cracking and greatly improve the performance of the cement cementing material.
In order to achieve the above object, the present application provides the following technical solutions:
the concrete based on the micro-nano components comprises the following raw materials in parts by weight:
45-58 parts of cement; 95-110 parts of machine-made sand; 200-220 parts of stones; 25-45 parts of water; 4-7 parts of silica fume; 0.8-1.5 parts of polycarboxylic acid water reducer; 0.4-0.6 parts of micrometer material; 1.2-1.5 parts of nano material; 0.04-0.08 part of dispersing agent.
The application also has the following additional technical characteristics:
preferably, the stones are continuously graded with the fineness of 5-40 mm, and the fineness modulus of the machine-made sand is 2.5-2.8.
Preferably, the micrometer material is fly ash.
Preferably, the nano material is nano silicon nitride, carbon nano tube and nano Al 2 O 3 The mass ratio is 1:1:1.
Preferably, the carbon nanotubes are single-walled carbon nanotubes and/or multi-walled carbon nanotubes.
Preferably, the dispersant is Di spersant-5043, available from Weifang Lu-chemical Co., ltd.
Preferably, the cement is p.o42.5r.
Preferably, the preparation method of the concrete comprises the following steps:
(1) Uniformly mixing 1% -10% of the total water content of the micrometer material, the nanometer material and the dispersing agent to obtain a micro-nano composite material;
(2) And (3) adding the residual water after the cement, the machine-made sand, the stones, the silica fume and the polycarboxylic acid water reducer are stirred uniformly, continuously stirring uniformly, adding the micro-nano composite material, and stirring uniformly again to obtain the flowing concrete.
Compared with the prior art, the application has the advantages that:
advantage 1: the capability of the silica fume to promote the pozzolan reaction of the fly ash is adopted in the application, so that the hydration reaction of cement can be promoted.
Advantage 2: the carbon nano tube adopted in the application has excellent tensile strength, and nano silicon nitride belongs to nano ceramic, so that the concrete can be endowed with good toughness and strength.
Advantage 3: three kinds of nanomaterial in the present application (nano silicon nitride, carbon nanotube and nano Al 2 O 3 ) The cement slurry has the advantages that the cement slurry plays a role of a seed crystal in hydration hardening of cement concrete, the hydration of clinker and mineral powder is induced, the secondary hydration reaction is promoted, the secondary hydration product can fill the pores among particles with different particle diameters, a compact network structure is finally formed, and the performance of the cement slurry is effectively improved; the three nano materials in the application can better exert the synergistic optimization of the nano material activity effect, the filling effect and the crystal nucleus effect, improve the interface performance, and greatly improve the performance of the cementing material so as to meet the requirements of great engineering and severe environment on high durability.
Advantage 4: because the micrometer material and the nanometer material are easy to agglomerate, the application adopts the commercially available dispersing agent to dissolve the micrometer material and the nanometer material well.
Detailed Description
Some embodiments of the application are disclosed below and one skilled in the art can, based on the disclosure herein, suitably modify the process parameters to achieve this. It is expressly noted that all such similar substitutions and modifications will be apparent to those skilled in the art, and are deemed to be included in the present application. While the methods and applications of this application have been described in terms of preferred embodiments, it will be apparent to those skilled in the relevant art that variations and modifications can be made in the methods and applications described herein, and in the practice and application of the techniques of this application, without departing from the spirit or scope of the application.
The concrete based on the micro-nano components comprises the following raw materials in parts by weight: 45-58 parts of cement; 95-110 parts of machine-made sand; 200-220 parts of stones; 25-45 parts of water; 4-7 parts of silica fume; 0.8-1.5 parts of polycarboxylic acid water reducer; 0.4-0.6 parts of micrometer material; 1.2-1.5 parts of nano material; 0.04-0.08 part of dispersing agent.
Materials: the stone is continuously graded with the thickness of 5-40 mm, and the fineness modulus of the machine-made sand is 2.5-2.8.
The nanometer material is nanometer silicon nitride, carbon nanotube and nanometer Al 2 O 3 The mass ratio is 1:1:1.
The carbon nanotubes are single-walled carbon nanotubes and/or multi-walled carbon nanotubes.
The dispersant was Di spersant-5043, available from Weifang Lu-chemical Co., ltd.
The cement is P.O42.5R; the fly ash is class II fly ash.
Example 1:
the concrete based on the micro-nano components comprises the following raw materials in parts by weight:
51 parts of cement; 103 parts of machine-made sand; 210 parts of stones; 33 parts of water; 5 parts of silica fume; 1.2 parts of polycarboxylic acid water reducer; 0.5 parts of fly ash; 1.3 parts of nano material; 0.05 part of dispersing agent.
(1) Uniformly mixing 5% of the total water content of the micrometer material, the nanometer material and the dispersing agent to obtain the micro-nano composite material, wherein the nanometer material is nanometer silicon nitride and multiple wallsCarbon nanotubes and nano Al 2 O 3 ；
(2) And (3) adding the residual water after the cement, the machine-made sand, the stones, the silica fume and the polycarboxylic acid water reducer are stirred uniformly, continuously stirring uniformly, adding the micro-nano composite material, and stirring uniformly again to obtain the flowing concrete.
Example 2:
the concrete based on the micro-nano components comprises the following raw materials in parts by weight:
47 parts of cement; 100 parts of machine-made sand; 220 parts of stones; 45 parts of water; 4 parts of silica fume; 0.9 parts of polycarboxylic acid water reducer; 0.6 parts of fly ash; 1.4 parts of nano material; 0.04 part of dispersing agent, wherein the nano material is nano silicon nitride, single-wall carbon nano tube and nano Al 2 O 3 。
(1) Uniformly mixing the micrometer material, the nanometer material and the dispersing agent with 1% of the total water to obtain a micro-nano composite material;
(2) And (3) adding the residual water after the cement, the machine-made sand, the stones, the silica fume and the polycarboxylic acid water reducer are stirred uniformly, continuously stirring uniformly, adding the micro-nano composite material, and stirring uniformly again to obtain the flowing concrete.
Example 3:
the concrete based on the micro-nano components comprises the following raw materials in parts by weight:
55 parts of cement; 97 parts of machine-made sand; 202 parts of stones; 27 parts of water; 6 parts of silica fume; 1.5 parts of polycarboxylic acid water reducer; 0.4 parts of fly ash; 1.2 parts of nano material; 0.05 part of dispersing agent, wherein the nano material is nano silicon nitride, single-wall carbon nano tube and nano Al 2 O 3 。
(1) Uniformly mixing the micrometer material, the nanometer material and the dispersing agent with 3% of the total water to obtain a micro-nano composite material;
(2) And (3) adding the residual water after the cement, the machine-made sand, the stones, the silica fume and the polycarboxylic acid water reducer are stirred uniformly, continuously stirring uniformly, adding the micro-nano composite material, and stirring uniformly again to obtain the flowing concrete.
Example 4:
the concrete based on the micro-nano components comprises the following raw materials in parts by weight:
56 parts of cement; 103 parts of machine-made sand; 212 parts of stones; 35 parts of water; 6 parts of silica fume; 1.4 parts of polycarboxylic acid water reducer; 0.6 parts of fly ash; 1.3 parts of nano material; 0.08 part of dispersing agent, wherein the nano material is nano silicon nitride, multi-wall carbon nano tube and nano Al 2 O 3 。
(1) Uniformly mixing 10% of the total water content of the micrometer material, the nanometer material and the dispersing agent to obtain a micro-nano composite material;
(2) And (3) adding the residual water after the cement, the machine-made sand, the stones, the silica fume and the polycarboxylic acid water reducer are stirred uniformly, continuously stirring uniformly, adding the micro-nano composite material, and stirring uniformly again to obtain the flowing concrete.
Comparative example 1 As in example 1, nano silicon nitride was not used as the nano material, the total amount of nano material was not changed, carbon nanotubes and nano Al 2 O 3 The mass ratio is 1:1.
Comparative example 2 the same as example 1, the nanomaterial used no carbon nanotube, nano silicon nitride and nano a12O3 in a mass ratio of 1:1.
Comparative example 3 As in example 1, nano Al was not used for nano materials 2 O 3 The mass ratio of the nano silicon nitride to the carbon nano tube is 1:1.
Comparative example 4 as in example 1, no nanomaterial was used.
Performance experiment: test blocks in different ages are molded, and the test blocks are subjected to standard maintenance and then are tested by referring to GB/T50081 common concrete mechanical property test method standard. The compressive strength, flexural strength and chloride ion diffusion coefficient of the concrete prepared in each example were measured, and three parallel experiments were performed for each group of experiments, and the grouping and test results are shown in table 1.
Table 1 mechanical property test of concrete
As can be seen from table 1, compared with comparative example 4, the nano material of example 1 can indeed greatly increase the performance of the cementing material, and the ultra-fine particles of the nano material can exert the effects of nucleus induction, packing compaction and hydration activity enhancement during the formation of the performance of the cementing material, thereby greatly improving the durability and service life of the engineering structure, and being helpful for promoting the development of high durability and sustainability of the concrete material.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (5)
1. The concrete based on the micro-nano component is characterized by comprising the following raw materials in parts by weight:
45-58 parts of cement; 95-110 parts of machine-made sand; 200-220 parts of stones; 25-45 parts of water; 4-7 parts of silica fume; 0.8-1.5 parts of polycarboxylic acid water reducer; 0.4-0.6 parts of micrometer material; 1.2-1.5 parts of nano material; 0.04-0.08 part of dispersing agent, wherein the type of the dispersing agent is Di spersant-5043, and the dispersing agent is purchased from Weifang Lu-chemical Co., ltd; the nanometer material is nanometer silicon nitride, carbon nanotube and nanometer Al 2 O 3 The mass ratio is 1:1:1.
2. The concrete based on micro-nano components according to claim 1, wherein the stones are of 5-40 mm continuous grading, and the machine-made sand is of fineness modulus of 2.5-2.8.
3. The micro-nano component based concrete of claim 1, wherein the micro-material is fly ash.
4. The micro-nano composition-based concrete according to claim 1, wherein the carbon nanotubes are single-walled carbon nanotubes and/or multi-walled carbon nanotubes.
5. The concrete based on micro-nano components according to claim 1, wherein the preparation method of the concrete comprises the following steps:
(1) Uniformly mixing 1% -10% of the total water content of the micrometer material, the nanometer material and the dispersing agent to obtain a micro-nano composite material;
(2) And (3) adding the residual water after the cement, the machine-made sand, the stones, the silica fume and the polycarboxylic acid water reducer are stirred uniformly, continuously stirring uniformly, adding the micro-nano composite material, and stirring uniformly again to obtain the flowing concrete.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103319129A (en) * | 2013-06-27 | 2013-09-25 | 东南大学 | Ecological nanoparticle reinforced cement based composite material and preparation method thereof |
| CN104387005A (en) * | 2014-10-30 | 2015-03-04 | 苏州莱特复合材料有限公司 | Carbon nanotube/cement composite material and preparation method thereof |
| CN105693167A (en) * | 2016-03-11 | 2016-06-22 | 中国建筑材料科学研究总院 | Concrete based on micro-nano powder and preparation method of concrete |
| CN109704662A (en) * | 2019-03-08 | 2019-05-03 | 河南理工大学 | A kind of nano silicon nitride reinforced cement-based material and preparation method thereof |
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- 2022-11-20 CN CN202211451277.7A patent/CN115636647B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103319129A (en) * | 2013-06-27 | 2013-09-25 | 东南大学 | Ecological nanoparticle reinforced cement based composite material and preparation method thereof |
| CN104387005A (en) * | 2014-10-30 | 2015-03-04 | 苏州莱特复合材料有限公司 | Carbon nanotube/cement composite material and preparation method thereof |
| CN105693167A (en) * | 2016-03-11 | 2016-06-22 | 中国建筑材料科学研究总院 | Concrete based on micro-nano powder and preparation method of concrete |
| CN109704662A (en) * | 2019-03-08 | 2019-05-03 | 河南理工大学 | A kind of nano silicon nitride reinforced cement-based material and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 沈威，武汉理工大学出版社.《水泥工艺学 （重排本）》.2011,(第1版),第238页. * |
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