CN112408820B - Fly ash activity excitant, fly ash cement and preparation method thereof - Google Patents
Fly ash activity excitant, fly ash cement and preparation method thereof Download PDFInfo
- Publication number
- CN112408820B CN112408820B CN202011359023.3A CN202011359023A CN112408820B CN 112408820 B CN112408820 B CN 112408820B CN 202011359023 A CN202011359023 A CN 202011359023A CN 112408820 B CN112408820 B CN 112408820B
- Authority
- CN
- China
- Prior art keywords
- fly ash
- cement
- excitant
- activity
- dihydrate gypsum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000010881 fly ash Substances 0.000 title claims abstract description 165
- 239000004568 cement Substances 0.000 title claims abstract description 119
- 230000000694 effects Effects 0.000 title abstract description 56
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000011398 Portland cement Substances 0.000 claims abstract description 28
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 25
- 239000010440 gypsum Substances 0.000 claims abstract description 25
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 25
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 21
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 21
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims abstract description 21
- 235000019345 sodium thiosulphate Nutrition 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 239000003469 silicate cement Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 3
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims 2
- 239000004567 concrete Substances 0.000 abstract description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract description 18
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 abstract description 18
- 230000008901 benefit Effects 0.000 abstract description 11
- 230000003334 potential effect Effects 0.000 abstract description 6
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 18
- 239000012190 activator Substances 0.000 description 13
- 239000003513 alkali Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 239000002956 ash Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- -1 alcohol amine Chemical class 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- LDDQLRUQCUTJBB-UHFFFAOYSA-N ammonium fluoride Chemical compound [NH4+].[F-] LDDQLRUQCUTJBB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
Landscapes
- 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)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a fly ash activity excitant, fly ash cement and a preparation method thereof, wherein the fly ash cement comprises the following components in percentage by mass: 20-55% of portland cement clinker, 3-6% of dihydrate gypsum, 40-65% of fly ash and 0.5-1.5% of fly ash activity excitant, wherein the sum of the mass percentages of the components is 100%; the fly ash activity excitant comprises the following components in parts by weight: 0.5-1 part of sodium thiosulfate, 0.02-0.05 part of ammonium hydrogen phosphide, 0.01-0.03 part of triethanolamine and 0.008-0.01 part of sodium dodecyl sulfate. The fly ash activity excitant can effectively excite the potential activity of fly ash in cement or cement concrete, and can obviously increase the doping amount of fly ash in cement or cement concrete and the performance of cement concrete, thereby achieving the aim that the doping amount of fly ash is more than 40 percent, further saving cement and reducing the cost of concrete and products thereof, and having obvious economic benefit and social benefit.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a fly ash activity excitant, fly ash cement and a preparation method thereof.
Background
Cement, powdered hydraulic inorganic cementing material. After being stirred by adding water, the mortar can be hardened in the air or better in water and can firmly bond sand, stone and other materials together. The cement is an important building material, and mortar or concrete made of the cement is firm and durable and is widely applied to engineering such as civil construction, water conservancy, national defense and the like.
Cement production requires the consumption of large amounts of non-renewable natural mineral resources such as limestone, clay, etc. With the rapid development of the cement industry, the traditional calcareous raw materials, siliceous raw materials and correction raw materials are limited, and the supply and demand contradiction is caused by the sharp increase of the cement requirement and the shortage of traditional mineral resources. At present, the solution is to add active mixing materials into cement, reduce the clinker content by adding the mixing materials, and each index of the cement can reach the requirements specified in GB175-2007 general Portland Cement. Nowadays, fly ash is used as a cement admixture, the amount of the fly ash is rapidly increased, and the fly ash is the second largest cement production admixture next to slag. The fly ash can be used as a common active mixing material and can be mixed with Ca (OH) generated after cement hydration2The pozzolan reaction occurs to generate cementitious substances such as C-S-H, and the like, so the cement mortar is widely used in the cement industry. The fly ash is applied to cement, so that the problems of stockpiling and pollution are solved, the added value of the fly ash can be realized, and the fly ash has double effects of protecting environment and recycling resourcesMeaning.
Although the fly ash can generate the volcanic ash reaction, the reaction speed is slow, so that the early strength of a fly ash doped system is obviously reduced. The blending amount of the fly ash in the fly ash portland cement is regulated to be 20-40% in GB175-2007 general portland cement, but the blending amount can rarely reach 40% in actual industrial production, and the strength of a system is obviously reduced when the blending amount is too high. This is because, compared with cement clinker, fly ash has much lower reactivity and very slow reaction speed without external excitation. The exciting agents mainly used in China at present comprise alkali exciting agents and sulfate exciting agents: the alkali activator can excite the early activity of the fly ash in a fly ash-cement system, but the effect is not ideal enough, the mixing amount of the fly ash can be only improved to a small extent, and the alkali content in the national standard of general cement is Na2O+0.658K2The calculated value of O has requirements, and the addition of the alkali activator can cause the alkali exceeding and influence the performance of the concrete; the effect of the sulfate excitant is not ideal enough, the mixing amount of the fly ash can be improved only by a small degree, and if the excitant is added in a large amount, another index SO in the cement can be caused3Exceeding the national standard, and causing the corrosion of the steel bars in the reinforced concrete.
In addition, although some researchers research the chemical excitation of the fly ash, the selection and the matching of the exciting agent are not reasonable enough, and the exciting effect of the exciting agent is not obvious.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a fly ash activity excitant, fly ash cement and a preparation method thereof so as to solve the problems in the technical background.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the fly ash activity excitant comprises the following components in parts by weight: 0.5-1 part of sodium thiosulfate, 0.02-0.05 part of ammonium hydrogen phosphide, 0.01-0.03 part of triethanolamine and 0.008-0.01 part of sodium dodecyl sulfate.
Further, the fly ash activity excitant comprises the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.03 part of ammonium hydrogen phosphide, 0.02 part of triethanolamine and 0.009 part of sodium dodecyl sulfate.
The fly ash cement based on the fly ash activity excitant comprises the following components in percentage by mass: 20-55% of portland cement clinker, 3-6% of dihydrate gypsum, 40-65% of fly ash and 0.5-1.5% of excitant, wherein the sum of the mass percentages of the components is 100%; the excitant is the fly ash activity excitant.
Further, the fly ash cement comprises the following components in percentage by mass: 39% of portland cement clinker, 5% of dihydrate gypsum, 55% of fly ash and 1% of excitant, wherein the sum of the mass percentages of the components is 100%.
In the technical scheme, the particle sizes of the portland cement clinker and the dihydrate gypsum are both less than 3 percent after passing through a 80-micron square-hole sieve, and the specific surface areas are more than or equal to 300m2/kg。
In the technical scheme, the portland cement clinker and dihydrate gypsum are mixed and ground or independently ground until the specific surface area is more than or equal to 300m2/kg。
In the technical scheme, the particle size of the fly ash is less than 2 percent after passing through a 80-micron square-hole sieve, and the specific surface area of the fly ash is smaller than that of the fly ash
≥350m2/kg。
A preparation method of fly ash cement comprises the following steps:
step one, weighing each component according to the designed cement component proportion;
step two, adding the fly ash into a stirrer, starting stirring, then adding triethanolamine, ammonium hydrogen phosphide, sodium thiosulfate and sodium dodecyl sulfate, and uniformly stirring to obtain active fly ash;
and step three, mixing the active fly ash, the silicate cement clinker and the dihydrate gypsum uniformly to obtain the fly ash cement.
Compared with the prior art, the invention has the beneficial effects that:
1. the fly ash activity excitant can effectively excite the potential activity of fly ash in cement or cement concrete, and can obviously increase the mixing amount of fly ash in cement or cement concrete and the performance of cement concrete, thereby reaching the aim that the mixing amount of fly ash is more than 40%. The cement is saved, the cost of the concrete and the products thereof is reduced, and the economic benefit and the social benefit are remarkable.
2. The fly ash activity excitant provided by the invention comprises 0.5-1 part of sodium thiosulfate, 0.02-0.05 part of ammonium hydrogen phosphide, 0.01-0.03 part of triethanolamine and 0.008-0.01 part of sodium dodecyl sulfate, and the components have synergistic effect to effectively excite the potential activity of the fly ash in cement or cement concrete; wherein the hydrogen fluoride ammonia is mainly used for corroding and dissolving effective components (SiO) in cement and fly ash2，Al2O3) More calcium silicate hydrate, calcium aluminate hydrate, calcium sulphoaluminate hydrate and the like are generated; sodium thiosulfate and triethanolamine, which are mainly used for improving the early strength and the later strength; the sodium dodecyl sulfate surfactant is used to lower the surface energy of solution, increase the specific surface area of reaction and raise the activity of cement.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The fly ash activity excitant comprises the following components in parts by weight: 0.5-1 part of sodium thiosulfate, 0.02-0.05 part of ammonium hydrogen phosphide, 0.01-0.03 part of triethanolamine and 0.008-0.01 part of sodium dodecyl sulfate.
The fly ash cement based on the fly ash activity excitant comprises the following components in percentage by mass: 20-55% of portland cement clinker, 3-6% of dihydrate gypsum, 40-65% of fly ash and 0.5-1.5% of excitant, wherein the sum of the mass percentages of the components is 100%; the excitant is the fly ash activity excitant.
In the invention, the silicate cement clinker and the dihydrate gypsum are purchased in the market, and the silicate cement clinker and the dihydrate gypsum are mixed and ground or independently ground, so that the granularity of the silicate cement clinker and the dihydrate gypsum is less than 3 percent after passing through a 80-micron square-hole sieve, and the specific surface area is more than or equal to 300m2Kg, further, its specific surface area is not less than 400m2/kg。。
In the invention, the fly ash is fine ash collected from flue gas generated after coal combustion, and is main solid waste discharged from a coal-fired power plant. The granularity of the fly ash used in the invention is less than 2 percent after sieving through a 80-micron square-hole sieve, and the specific surface area is more than or equal to 350m2Kg, further, its specific surface area is greater than or equal to 450m2/kg。
A preparation method of fly ash cement comprises the following steps:
step one, weighing each component according to the designed cement component proportion;
step two, adding the fly ash into a stirrer, starting stirring, then adding triethanolamine, ammonium hydrogen phosphide, sodium thiosulfate and sodium dodecyl sulfate, and uniformly stirring to obtain active fly ash;
and step three, mixing the active fly ash, the silicate cement clinker and the dihydrate gypsum uniformly to obtain the fly ash cement.
Because the activity of the fly ash is low, the performance of cement is reduced by adding too much fly ash into the cement, so that the activity of the fly ash needs to be improved to realize high doping amount of the fly ash, and in order to enhance the activity of the fly ash in the cement, the invention provides a fly ash activity excitant; wherein the ammonium hydrogen phosphide is mainly used for corroding and dissolving effective components (SiO) in cement and fly ash2，Al2O3) More calcium silicate hydrate, calcium aluminate hydrate, calcium sulphoaluminate hydrate and the like are generated. Sodium thiosulfate and triethanolamine, which are mainly used for improving the early strength and the later strength; the sodium dodecyl sulfate surfactant is used to lower the surface energy of solution, increase the specific surface area of reaction and raise the activity of cement. The activator can effectively excite the fly ash in cement orThe potential activity of the cement concrete can obviously increase the doping amount of the fly ash in the cement or the cement concrete and the performance of the cement concrete, thereby reaching the doping amount of the fly ash of more than 40 percent. The cement is saved, the cost of the concrete and the products thereof is reduced, and the economic benefit and the social benefit are remarkable.
After the exciting agent is added into cement, chemical reaction is produced between chemical matter and aluminium, silicon, calcium, etc. in cement to produce hydrated calcium sulfoaluminate as intermediate with reinforcing function and oxide (SiO) in cement2、Al2O3) The crystal lattice defect increases the activity of the fly ash, thereby improving the strength of the cement and the performance of the cement; on the other hand, the alcohol amine material acts on the surfaces of the ground material particles to reduce the friction force and the adhesion force among the particles, so that the sliding among the particles is easy, and the fluidity of the material is increased, thereby improving the grinding working condition in the mill, finally improving the grinding effect and increasing the mixing amount of the mixed material. The excitant has obvious advantages in improving the mixing amount of cement admixture.
The invention will now be further described with reference to the following examples, but the invention is not limited thereto.
Firstly, researching the performance of the excitant with different components and proportions for producing the cement with high content of fly ash
Example 1
The fly ash cement comprises the following components in percentage by mass: 39% of portland cement clinker, 5% of dihydrate gypsum, 55% of fly ash and 1% of excitant, wherein the sum of the mass percentages of the components is 100%;
the excitant is a fly ash activity excitant; the fly ash activity excitant comprises the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.03 part of ammonium hydrogen phosphide, 0.02 part of triethanolamine and 0.009 part of sodium dodecyl sulfate.
Example 2
The fly ash cement comprises the following components in percentage by mass: 39% of portland cement clinker, 5% of dihydrate gypsum, 55% of fly ash and 1% of excitant, wherein the sum of the mass percentages of the components is 100%;
the excitant is a fly ash activity excitant; the fly ash activity excitant comprises the following components in parts by weight: 0.5 part of sodium thiosulfate, 0.05 part of ammonium hydrogen phosphide, 0.01 part of triethanolamine and 0.008 part of sodium dodecyl sulfate.
Example 3
The fly ash cement comprises the following components in percentage by mass: 39% of portland cement clinker, 5% of dihydrate gypsum, 55% of fly ash and 1% of excitant, wherein the sum of the mass percentages of the components is 100%;
the excitant is a fly ash activity excitant; the fly ash activity excitant comprises the following components in parts by weight: 1 part of sodium thiosulfate, 0.02 part of ammonium hydrogen phosphide, 0.03 part of triethanolamine and 0.01 part of sodium dodecyl sulfate.
Example 4
This example provides a fly ash cement similar to that of example 1, except that the fly ash activity promoter does not contain ammonium hydrogen phosphide, i.e. the fly ash activity promoter comprises the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.02 part of triethanolamine and 0.009 part of sodium dodecyl sulfate.
Example 5
This example provides a fly ash cement similar to that of example 1, except that the fly ash activity promoter does not include sodium lauryl sulfate, i.e., the fly ash activity promoter includes the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.03 part of ammonium hydrogen phosphide and 0.02 part of triethanolamine.
Example 6
This example provides a fly ash cement similar to that of example 1, except that the fly ash activity promoter does not include triethanolamine, i.e., the fly ash activity promoter includes the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.03 part of ammonium hydrogen phosphide and 0.009 part of sodium dodecyl sulfate.
According to the detection of the high-doped fly ash cement obtained in the embodiments 1 to 6, the properties of the high-doped fly ash cement produced by using different components and proportions of the excitant are researched, the components and proportions are shown in the table 1, and the properties of the cement are shown in the table 2:
TABLE 1
TABLE 2
It can be known from tables 1 and 2 that, compared with examples 4 to 6, the fly ash activity excitant formula adopts 0.5 to 1 part of sodium thiosulfate, 0.02 to 0.05 part of ammonium hydrogen phosphide, 0.01 to 0.03 part of triethanolamine and 0.008 to 0.01 part of sodium dodecyl sulfate, so that the performance of the cement is greatly improved, the fly ash activity excitant disclosed by the invention can effectively excite the potential activity of fly ash in cement or cement concrete, and when the mixing amount of the fly ash in the cement or cement concrete is remarkably increased, each strength index of the cement greatly exceeds the 42.5 grade strength requirement of fly ash portland cement specified in GB175-2007 general portland cement, so that the 52.5 grade strength requirement of the fly ash portland cement is met.
Secondly, researching the influence of different fly ash mixing amounts and different excitants on the performance of fly ash cement
Example 7
The embodiment provides a fly ash cement, wherein the components and the mixture ratio of the activator are the same as those of the fly ash activity activator in embodiment 1, namely the fly ash activity activator, and the fly ash cement comprises the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.03 part of ammonium hydrogen phosphide, 0.02 part of triethanolamine and 0.009 part of sodium dodecyl sulfate. The differences are as follows: the mixing amount of the portland cement clinker and the fly ash is different; the method specifically comprises the following steps:
the fly ash cement comprises the following components in percentage by mass: 54 percent of Portland cement clinker, 5 percent of dihydrate gypsum, 40 percent of fly ash and 1 percent of excitant, wherein the sum of the mass percentages of the components is 100 percent;
example 8
The embodiment provides a fly ash cement, wherein the components and the mixture ratio of the activator are the same as those of the fly ash activity activator in embodiment 1, namely the fly ash activity activator, and the fly ash cement comprises the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.03 part of ammonium hydrogen phosphide, 0.02 part of triethanolamine and 0.009 part of sodium dodecyl sulfate. The differences are as follows: the mixing amount of the portland cement clinker and the fly ash is different; the method specifically comprises the following steps:
the fly ash cement comprises the following components in percentage by mass: 29% of portland cement clinker, 5% of dihydrate gypsum, 65% of fly ash and 1% of excitant, wherein the sum of the mass percentages of the components is 100%;
example 9
This example provides a fly ash cement similar to that of example 1. The differences are as follows: no excitant, specifically:
the fly ash cement comprises the following components in percentage by mass: 40% of Portland cement clinker, 5% of dihydrate gypsum and 55% of fly ash, wherein the sum of the mass percentages of the components is 100%;
example 10
This example provides a fly ash cement similar to that of example 1. The difference lies in that: the excitant is an alkali excitant and can be purchased in the market; the method specifically comprises the following steps:
the fly ash cement comprises the following components in percentage by mass: 39% of portland cement clinker, 5% of dihydrate gypsum, 55% of fly ash and 1% of alkali activator, wherein the sum of the mass percentages of the components is 100%;
example 11
This example provides a fly ash cement similar to that of example 1. The differences are as follows: the excitant is a sulfate excitant and can be purchased in the market; the method specifically comprises the following steps:
the fly ash cement comprises the following components in percentage by mass: 39% of portland cement clinker, 5% of dihydrate gypsum, 55% of fly ash and 1% of sulfate excitant, wherein the sum of the mass percentages of the components is 100%;
according to the detection of the fly ash-doped cement obtained in the embodiment 1, the embodiment 7 and the embodiment 8, the concrete component ratio of the cement performance obtained by adding different fly ash contents when the fly ash activity excitant provided by the invention is used is shown in table 3, and the cement performance is shown in table 4:
according to the detection of the high-doped fly ash cement obtained in the embodiment 1 and the embodiments 9 to 11, the cement performance of adding different excitants is researched, the concrete component ratio is shown in the table 3, and the cement performance is shown in the table 4:
TABLE 3
| Group of | Cement clinker (kg) | Dihydrate Gypsum (kg) | Fly ash (kg) | Exciting agent |
| Example 1 | 39 | 5 | 55 | Fly ash activity excitant 1kg |
| Example 7 | 54 | 5 | 40 | Fly ash activity excitant 1kg |
| Example 8 | 29 | 5 | 65 | Fly ash activity excitant 1kg |
| Example 9 | 40 | 5 | 55 | / |
| Example 10 | 39 | 5 | 55 | Alkali activator 1kg |
| Example 11 | 39 | 5 | 55 | Sulfate excitant 1kg |
Remarking: in table 3, the fly ash activity excitant comprises the following components in parts by weight: 0.85 part of sodium thiosulfate, 0.03 part of ammonium hydrogen phosphide, 0.02 part of triethanolamine and 0.009 part of sodium dodecyl sulfate.
TABLE 4
In tables 3 and 4, as can be seen from examples 1, 7 and 8, the fly ash activity excitant provided by the invention can effectively excite the potential activity of fly ash in cement or cement concrete, and each strength index of the cement reaches or even exceeds the 42.5-grade strength requirement of fly ash portland cement specified in GB175-2007 general portland cement when the amount of the fly ash is 40-65%.
Compared with examples 1, 9, 10 and 11, it can be seen that the cement performance of the fly ash activity-activating agent of the present invention is greatly improved compared with the alkali activator or the sulfate activator, and the fly ash activity-activating agent of the present invention can significantly increase the amount of fly ash mixed in cement or cement concrete and the performance of cement concrete, so as to achieve a fly ash mixing amount of more than 40%. The cement is saved, the cost of the concrete and the products thereof is reduced, and the economic benefit and the social benefit are remarkable. The fly ash activity excitant has obvious advantages in improving the mixing amount of cement admixture.
The above embodiments only express specific embodiments of the present invention, and the description is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (6)
1. The fly ash cement is characterized by comprising the following components in percentage by mass: 20-55% of portland cement clinker, 3-6% of dihydrate gypsum, 40-65% of fly ash and 0.5-1.5% of excitant, wherein the sum of the mass percentages of the components is 100%; the exciting agent comprises 0.5-1 part of sodium thiosulfate, 0.02-0.05 part of ammonium bifluoride, 0.01-0.03 part of triethanolamine and 0.008-0.01 part of sodium dodecyl sulfate.
2. The fly ash cement as claimed in claim 1, which comprises the following components in percentage by mass: 39% of portland cement clinker, 5% of dihydrate gypsum, 55% of fly ash and 1% of excitant, wherein the sum of the mass percentages of the components is 100%.
3. The fly ash cement as claimed in claim 2, wherein the particle sizes of the portland cement clinker and the dihydrate gypsum are both less than 3% after passing through a 80 μm square-hole sieve, and the specific surface area is more than or equal to 300m2/kg。
4. The fly ash cement as claimed in claim 3, wherein the portland cement clinker is mixed with dihydrate gypsum and ground or ground separately until the specific surface area is not less than 300m2/kg。
5. The fly ash cement as claimed in claim 3, wherein the particle size of the fly ash is less than 2% after passing through a 80 μm square-hole sieve, and the specific surface area is more than or equal to 350m2/kg。
6. The method for preparing fly ash cement according to claim 5, comprising the steps of:
step one, weighing each component according to the designed cement component proportion;
step two, adding the fly ash into a stirrer, starting stirring, then adding triethanolamine, ammonium bifluoride, sodium thiosulfate and sodium dodecyl sulfate, and uniformly stirring to obtain active fly ash;
and step three, mixing the active fly ash, the silicate cement clinker and the dihydrate gypsum uniformly to obtain the fly ash cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359023.3A CN112408820B (en) | 2020-11-27 | 2020-11-27 | Fly ash activity excitant, fly ash cement and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359023.3A CN112408820B (en) | 2020-11-27 | 2020-11-27 | Fly ash activity excitant, fly ash cement and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112408820A CN112408820A (en) | 2021-02-26 |
| CN112408820B true CN112408820B (en) | 2022-07-12 |
Family
ID=74842737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011359023.3A Expired - Fee Related CN112408820B (en) | 2020-11-27 | 2020-11-27 | Fly ash activity excitant, fly ash cement and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112408820B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115991579B (en) * | 2023-02-22 | 2023-12-22 | 上海百奥恒新材料有限公司 | Multi-source coal-based solid waste active powder material and preparation method and application thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578122A (en) * | 1994-02-14 | 1996-11-26 | The University Of Texas System | Methods of producing concretes containing class C fly ash that are stable in sulphate environments |
| CN105541166B (en) * | 2015-12-30 | 2017-11-03 | 聊城大学 | A kind of high limestone addition composite Portland cement grinding aid and preparation method thereof |
| CN107793052A (en) * | 2017-11-29 | 2018-03-13 | 扬州大学 | A kind of Portland fly ash cement and preparation method thereof |
| CN107986648A (en) * | 2017-12-26 | 2018-05-04 | 天津山水水泥有限公司 | Portland slag cement and preparation method thereof |
| CN110627400B (en) * | 2019-11-04 | 2021-05-14 | 广州市克来斯特建材科技有限公司 | Alkali-free accelerator and preparation method and application thereof |
| CN111943560B (en) * | 2020-08-06 | 2022-09-09 | 武汉源锦建材科技有限公司 | Low-resilience alkali-free liquid accelerator and preparation method thereof |
-
2020
- 2020-11-27 CN CN202011359023.3A patent/CN112408820B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN112408820A (en) | 2021-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108623196A (en) | A kind of lime excitation large dosage industrial residue low-carbon cement and preparation method thereof | |
| CN101549985B (en) | Calcination-free chemical gypsum dry mixed mortar used for plastering on inner walls | |
| CN109912243B (en) | Cement produced by utilizing industrial solid wastes | |
| CN114873961B (en) | Molybdenum tailing dry-mixed mortar and application method thereof | |
| CN112159176A (en) | Wear-resistant self-leveling cement mortar doped with waste glass and preparation method thereof | |
| CN107382277A (en) | A kind of superfine composite modified agstone of concrete microdilatancy | |
| CN113105149A (en) | Concrete glue reducing agent and preparation method and application method thereof | |
| CN102653462A (en) | Binding material coal ash-cement and production method thereof | |
| CN114605121B (en) | Tungsten tailing autoclaved aerated concrete and preparation method thereof | |
| CN103979828B (en) | A kind of slag base concrete admixture function regulator and preparation method thereof | |
| CN102219405A (en) | Recycling of construction wastes | |
| CN112408820B (en) | Fly ash activity excitant, fly ash cement and preparation method thereof | |
| CN114180914A (en) | High-strength concrete prepared by applying cobbles | |
| CN110981233B (en) | Ferronickel slag masonry cement and preparation method thereof | |
| CN109020403A (en) | A kind of C80 high-strength concrete and preparation method thereof | |
| CN102690069A (en) | Regeneration method taking construction wastes as cement raw materials | |
| CN110937863A (en) | Recyclable cement concrete and preparation method thereof | |
| CN114014568B (en) | Low-alkali cement special for railway and bridge construction and preparation method thereof | |
| CN109437769A (en) | A kind of C30P10 subway concrete and preparation method thereof | |
| CN109180060B (en) | Enhanced concrete expanding agent and preparation method thereof | |
| CN103708754B (en) | A kind of ready mixed concrete adulterant and preparation method thereof | |
| CN112573853A (en) | Titanium gypsum-based full-solid waste cementing material excitant and preparation method thereof | |
| CN112110669A (en) | Recycled aggregate reinforcing agent, preparation method thereof and recycled aggregate concrete | |
| CN110316987A (en) | A kind of unburned natural curing slow-release manufactured aggregate and preparation method thereof | |
| CN116621552B (en) | Low-concentration slurry regulator and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220712 |