CN110981337B - Reactive powder concrete doped with waste glass powder and preparation method thereof - Google Patents
Reactive powder concrete doped with waste glass powder and preparation method thereof Download PDFInfo
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- CN110981337B CN110981337B CN201911217715.1A CN201911217715A CN110981337B CN 110981337 B CN110981337 B CN 110981337B CN 201911217715 A CN201911217715 A CN 201911217715A CN 110981337 B CN110981337 B CN 110981337B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/22—Glass ; Devitrified glass
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a waste glass powder doped reactive powder concrete and a preparation method thereof, wherein the reactive powder concrete comprises the following raw materials in parts by weight: 450-810 parts of cement, 160-240 parts of silica fume, 35-240 parts of waste glass powder, 1200-1250 parts of silica sand, 50-60 parts of water reducing agent, 18-30 parts of high-efficiency dispersing agent, 100-150 parts of steel fiber, 158-200 parts of water and 10-20 parts of active exciting agent, wherein the diameter of the waste glass powder ranges from 50-80 micrometers, and the specific surface area ranges from 400 m to 540m2The main chemical components of the material are as follows by weight percent: SiO 22 65％～70％、Na2O 10％～15％、CaO 9％～10％、Al2O33 to 4 percent of MgO and 1 to 2 percent of MgO. The invention utilizes the higher content of alkali in the waste glass powder to accelerate the hydration reaction after mixing with cement, silica powder, silica sand, steel fiber and the like, further improves the volcanic ash activity of the waste glass powder, generates higher hydration heat in the concrete, ensures that the concrete can utilize the heat in the concrete to promote the hydration reaction under the normal temperature condition, and accelerates the hardening and the strength increase.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to waste glass powder doped reactive powder concrete and a preparation method thereof.
Background
The active powder concrete is ultrahigh-strength toughened concrete produced by using active powder materials such as cement, mineral admixture and the like, fine aggregate, an additive, high-strength fine steel fibers and/or organic synthetic fibers, water and the like as raw materials, improves the internal microstructure of the concrete by reducing internal defects of the materials, and obtains superior performances such as ultrahigh strength, high toughness, high durability, volume stability and the like under the steam curing or hot water curing condition.
The waste glass is mainly generated by the waste of plate glass of doors and windows, glass containers and the like of buildings and automobiles and is visible everywhere in municipal solid waste. The existing main way for treating the waste glass is landfill, which not only occupies land resources but also is not beneficial to the environment, and if the waste glass can be ground into powder with certain particle size for preparing the active powder concrete, the method has great economic and environmental significance. For example, CN103172323A discloses adding superfine common waste glass powder to raw materials such as cement, silica fume, quartz powder, sand, water reducing agent, etc. to prepare active powder concrete. However, as the reactive powder in the raw materials of the reactive powder concrete, especially the quartz powder, has low reactivity under normal temperature curing, the compressive strength of the concrete cured at normal temperature is very low, so that the CN103172323A needs to be manually cured in a high temperature environment of 90-95 ℃ by adopting special equipment to obtain the required high strength, the operation is complex and harsh, and simultaneously, the extremely high curing cost is caused.
Disclosure of Invention
The invention aims to solve the problem that the existing reactive powder concrete needs high-temperature curing, and provides the reactive powder concrete doped with the waste glass powder and the preparation method thereof, and the concrete with high strength can be obtained by curing at normal temperature for a short time.
The invention provides a waste glass powder doped reactive powder concrete which comprises the following raw materials in parts by weight:
450-810 parts of cement;
160-240 parts of silica fume;
35-240 parts of waste glass powder;
1200-1250 parts of silica sand;
50-60 parts of a water reducing agent;
18-30 parts of a high-efficiency dispersant;
100-150 parts of steel fiber;
158-200 parts of water;
10-20 parts of an activity excitant;
wherein the average particle size of the waste glass powder is 50-80 μm, and the specific surface area is 400-540 m2The main chemical components of the material are as follows by weight percent: SiO 22 65％～70％、Na2O 10％～15％、CaO 9％～10％、Al2O3 3％～4％、MgO 1％～2％。
In a preferred embodiment, the waste glass powder-doped reactive powder concrete comprises the following raw materials in parts by weight:
630 parts of cement;
230 parts of silica fume;
70 parts of waste glass powder;
1220 parts of silica sand;
55 parts of a water reducing agent;
25 parts of a high-efficiency dispersant;
150 parts of steel fiber;
180 parts of water;
and 15 parts of an activity excitant.
Preferably, the 90d compressive strength of the waste glass powder doped active powder concrete is more than or equal to 180MPa, and the 90d tensile strength is more than or equal to 30 MPa.
Preferably, the cement is selected from P.O42.5R cement or above grade cement, and the specific surface area of the cement is more than or equal to 350m2/kg。
Preferably, the average particle size of the silica fume is 0.1-0.2 mu m, and the specific surface area of the silica fume is 15-25 m2/g。
Preferably, the silica sand comprises three components with the particle sizes of 270-550 μm, 150-270 μm and 75-150 μm, and the weight ratio of the three components is (2-2.5): (1.5-2.0): (1-2).
Preferably, the water reducing rate of the water reducing agent is 25-30%. In some preferred embodiments, the water reducing agent can be selected from polycarboxylic acid water reducing agents, and can effectively improve the fluidity of concrete and improve the strength of the concrete.
Preferably, the high-efficiency dispersing agent is selected from the combination of at least two substances of sodium hexametaphosphate, sodium citrate, sodium dodecyl benzene sulfonate, sodium polyacrylate and polyethylene glycol. In some preferred embodiments, the high-efficiency dispersing agent is selected from two or more of sodium hexametaphosphate, sodium citrate, sodium dodecyl benzene sulfonate, sodium polyacrylate and polyethylene glycol which are mixed in equal proportion, the pH value of the high-efficiency dispersing agent is 8.5-9.5, the solid content of the high-efficiency dispersing agent is 70%, and the high-efficiency dispersing agent can effectively prevent dry cracking, reduce particle accumulation and improve the compactness of concrete by virtue of excellent wettability and dispersibility of the high-efficiency dispersing agent.
Preferably, the length of the steel fiber is 12-15 mm, and the steel fiber is flat or/and wavy micro steel fiber.
Preferably, the activity stimulator is selected from at least three combinations of polyethylene, ether cyclic polydimethylsiloxane, calcium sulfoaluminate and calcium sulfate.
The water is industrial water.
The preparation method of the reactive powder concrete doped with the waste glass powder comprises the following steps:
(1) adding silica sand into a mixture of cement, silica fume, waste glass powder, an active excitant and a water reducing agent, and uniformly stirring to obtain a dry mixture;
(2) adding water into the dry mixture, adding steel fibers when the dry mixture is mixed until the fluidity reaches 150-200, adding a high-efficiency dispersing agent after the dry mixture is uniformly mixed, and continuously stirring until the fluidity is 230-300 to obtain a mixture;
(3) pouring the mixture into a mold, performing vibration molding, curing for 20-24 hours at normal temperature, removing the mold, and performing water covering curing for 80-90 days.
Compared with the prior art, the concrete of the invention comprises the following main chemical components by weight percent: 65% -70% of SiO2、10％～15％Na2O、9％～10％CaO、3％～4％Al2O3And 1% -2% of waste glass powder of MgO, the waste glass powder of this kind contains higher alkali, can accelerate the hydration reaction after mixing with cement, silica flour, silica sand, steel fiber, etc., further improve "volcanic ash activity" of the waste glass powder, produce higher heat of hydration in the concrete, make the concrete can utilize the heat in its own room temperature condition to promote the hydration reaction, accelerate hardening and strength to increase.
Meanwhile, in order to avoid the problems of temperature shrinkage and self-shrinkage caused by hydration heat generated in the concrete, the invention also adopts soaking curing to carry out heat dissipation shrinkage compensation on the concrete in the preparation process, thereby avoiding the cracking of the concrete caused by shrinkage.
In addition, in the preparation method, the high-efficiency dispersing agent is added after the steel fiber is added, so that the high-efficiency dispersing agent with wettability and dispersibility can be effectively utilized to wet the steel fiber, effectively disperse and creep, dredge the interface contact of the steel fiber and the mixture, and enable the steel fiber not to be easily agglomerated with other materials, thereby being uniformly dispersed in the whole mixture.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
Detailed Description
The waste glass powder with proper alkali content and other active substances is used for replacing cement, the active powder concrete is cured at normal temperature to obtain high strength, and meanwhile, the high temperature resistance of the active concrete is improved.
Example 1
The waste glass powder doped reactive powder concrete comprises the following components in parts by weight: 450-810 parts of cement, 160-240 parts of silica fume, 35-240 parts of waste glass powder, 1200-1250 parts of silica sand, 50-60 parts of a water reducing agent, 18-30 parts of a high-efficiency dispersing agent, 100-150 parts of steel fiber, 158-200 parts of water and 10-20 parts of an active exciting agent.
The preparation method is shown in a flow chart of figure 1 and comprises the following steps:
(1) firstly, metering and batching according to the mixture ratio shown in the table 1, and uniformly stirring silica sand with three types of particle sizes in a stirrer; mixing and stirring cement, silica fume, waste glass powder, an activity excitant and a powdery water reducing agent in another container, pouring the mixture into a stirrer to be dry-mixed with uniform silica sand, and stirring the mixture uniformly to obtain a dry mixture;
wherein the cement of table 1 is p.o42.5r cement; the silica fume had an average particle diameter of 0.2 μm and a specific surface area of 25m2/g。
Meanwhile, the silica sand consists of silica sand with three particle size ranges, the particle size ranges are 270-550 mu m (30-50 meshes), 150-270 mu m (50-100 meshes) and 75-150 mu m (100-200 meshes), and the weight ratio of the three ranges is 2.5: 1.5: 1.
the specific surface area of the waste glass powder is 421m2Per kg, the average particle size is 60 mu m, and the main chemical components comprise the following components in percentage by weight: SiO 2270％、Na2O 10％、CaO 10％、Al2O3 3％、MgO 1％。
The water reducing agent is selected from a polycarboxylic acid water reducing agent, and the water reducing rate is 30%; the main components of the high-efficiency dispersant comprise sodium hexametaphosphate, sodium citrate, sodium dodecyl benzene sulfonate, sodium polyacrylate and polyethylene glycol; the active excitant consists of three substances of polyethylene, ether cyclic polydimethylsiloxane and calcium sulphoaluminate.
(2) Slowly adding water into the dry mixture during stirring, performing wet mixing, adding steel fibers when the mixture is stirred to be pasty (the fluidity is 150-200), continuing wet mixing, adding a high-efficiency dispersing agent when the mixture is stirred for about 6min to be pasty (the fluidity is 150-200), and continuing wet mixing and stirring until obvious fluidity finally appears to obtain a mixture (the fluidity is 230-300);
(3) pouring the mixture into a mold, performing vibration molding, curing for 20-24 hours at normal temperature, removing the mold, and performing water covering curing for 80-90 days.
TABLE 1 reactive powder concrete mix ratio (by weight)
Wherein the variables of the examples 1-1 to 1-7 are the amount of the waste glass powder and the cement, the variables of the examples 1-8 to 1-13 are the amount of the steel fiber, and the main variables of the examples 1-14 to 1-20 are the amount of the water reducing agent. The main properties of the reactive powder concrete of each example are shown in table 2.
TABLE 2 reactive powder concrete Properties
| Numbering | 90d compressive strength/MPa | 90d tensile strength/MPa | Fluidity of mixture | 90d burst temperature/. degree.C |
| Examples 1 to 1 | 183 | 30.2 | 234 | 680 |
| Examples 1 to 2 | 183.7 | 32 | 236 | 696 |
| Examples 1 to 3 | 197 | 34.6 | 247 | 745 |
| Examples 1 to 4 | 194.3 | 33.9 | 241 | 721 |
| Examples 1 to 5 | 197.7 | 34 | 245 | 738 |
| Examples 1 to 6 | 195.6 | 35 | 250 | 747 |
| Examples 1 to 7 | 194.5 | 34.5 | 256 | 760 |
| Examples 1 to 8 | 190 | 30.8 | 265 | 509 |
| Examples 1 to 9 | 192 | 31.5 | 260 | 551 |
| Examples 1 to 10 | 193 | 32.1 | 257 | 613 |
| Examples 1 to 11 | 194.5 | 32.8 | 253 | 648 |
| Examples 1 to 12 | 196 | 33.2 | 251 | 689 |
| Examples 1 to 13 | 197 | 34.6 | 247 | 745 |
| Examples 1 to 14 | 191 | 32.5 | 236 | 721 |
| Examples 1 to 15 | 193 | 32.8 | 240 | 730 |
| Examples 1 to 16 | 194 | 33.2 | 243 | 737 |
| Examples 1 to 17 | 197 | 34.6 | 247 | 745 |
| Examples 1 to 18 | 197 | 34.4 | 249 | 749 |
| Examples 1 to 19 | 197 | 34.4 | 251 | 757 |
| Examples 1 to 20 | 198 | 34.5 | 251 | 763 |
As can be seen from Table 2, the waste glass powder-doped reactive powder concrete of examples 1-2 to 1-7, especially the reactive powder concrete of examples 1-3, has improved compressive strength, tensile strength, fluidity and bursting temperature compared with the common reactive powder concrete of example 1-1 without waste glass powder, which shows that the waste glass powder is used to replace cement to enhance the compactness of the reactive powder concrete and improve the high temperature resistance under the normal temperature curing condition.
As the steel fiber increases, the compressive strength, tensile strength and bursting temperature of the waste glass powder-doped reactive powder concrete monotonously increase, and the fluidity monotonously decreases, as shown in examples 1-8 to 1-13.
As shown in examples 1-14 to 1-20, the water reducing agent has a small influence on the compressive strength, tensile strength, fluidity and bursting temperature of the reactive powder concrete doped with the waste glass powder.
Example 2
The waste glass powder-doped reactive powder concrete was prepared according to the same preparation method as in example 1 by metering and compounding the components in the weight ratios shown in tables 3 and 4, and the properties thereof are shown in table 5.
TABLE 3 reactive powder concrete formulation (by weight) of example 2
TABLE 4 Properties of reactive powder concrete raw materials of example 2
TABLE 5 reactive powder concrete Properties of example 2
| Numbering | 90d compressive strength/MPa | 90d tensile strength/MPa | Fluidity of mixture | 90d burst temperature/. degree.C |
| Example 2-1 | 190.3 | 31.2 | 228 | 636 |
| Examples 2 to 2 | 179 | 29.1 | 242 | 628 |
| Examples 2 to 3 | 193 | 32.7 | 231 | 704 |
| Examples 2 to 4 | 191.4 | 32.9 | 231.5 | 712 |
| Examples 2 to 5 | 189.6 | 32.1 | 237 | 693 |
As can be seen from Table 5, there is no particular regularity between the concrete performance and the physical properties of the raw materials, and the compression strength, tensile strength and bursting temperature of the formed concrete fluctuate irregularly with the increase of the particle size of the waste glass powder, the change of the main chemical components, and the change of the properties and compositions of the silica fume and silica sand, and the average particle size of the waste glass powder is 50-80 μm and the specific surface area is 400-540 m in examples 2-3 and 2-42The main chemical components of the material are as follows by weight percent: SiO 2265％～70％、Na2O 10％～15％、CaO 9％～10％、Al2O33 to 4 percent of MgO, 1 to 2 percent of silicon ash, the average grain diameter of the silicon ash is 0.1 to 0.2 mu m, and the specific surface area is 15 to 25m2The silica sand comprises 270-550 mu m, 150-270 mu m and 75-150 mu m according to the weight ratio of (2-2.5): (1.5-2.0): and (1) within the range of 2), the compressive strength, the tensile strength and the bursting temperature of the formed concrete are optimally balanced.
Meanwhile, the concrete performance index is influenced by the doping amount of the steel fibers and changes regularly, wherein the fluidity is reduced along with the increase of the doping amount of the steel fibers, and the compressive strength, the tensile strength and the burst temperature are increased along with the increase of the doping amount of the steel fibers. The steel fiber content of the embodiment 2-3 is beyond the range of 100-150, the obtained 90d compressive strength is 179MPa <180MPa, and the obtained 90d tensile strength is 29.1MPa <30 MPa.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, embodiments, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (8)
1. The waste glass powder doped reactive powder concrete is characterized in that: the feed comprises the following raw materials in parts by weight:
450-810 parts of cement;
160-240 parts of silica fume;
35-240 parts of waste glass powder;
1200-1250 parts of silica sand;
50-60 parts of a water reducing agent;
18-30 parts of a high-efficiency dispersant;
100-150 parts of steel fiber;
158-200 parts of water;
10-20 parts of an activity excitant;
wherein the average particle size of the waste glass powder is 50-80 μm, and the specific surface area is 400-540 m2The main chemical components of the material are as follows by weight percent: SiO 22 65％～70％、Na2O 10％～15％、CaO 9％～10％、Al2O33% -4% of MgO, 1% -2% of MgO; the average particle size of the silica fume is 0.1-0.2 mu m, and the specific surface area of the silica fume is 15-25 m2(ii)/g; the silica sand comprises three components with particle sizes of 270-550 mu m, 150-270 mu m and 75-150 mu m, and the weight ratio of the three components is (2-2.5): (1.5-2.0): (1-2).
2. The waste glass powder-doped reactive powder concrete according to claim 1, which is characterized in that: the 90d compressive strength of the reactive powder concrete doped with the waste glass powder is more than or equal to 180MPa, and the 90d tensile strength is more than or equal to 30 MPa.
3. The waste glass powder-doped reactive powder concrete according to claim 2, which is characterized in that: the cement is selected from P.O42.5R cement or above grade cement, and the specific surface area is more than or equal to 350m2/kg。
4. The waste glass powder-doped reactive powder concrete according to claim 1, which is characterized in that: the water reducing rate of the water reducing agent is 25-30%.
5. The waste glass powder-doped reactive powder concrete according to claim 1, which is characterized in that: the high-efficiency dispersing agent is selected from the combination of at least two substances of sodium hexametaphosphate, sodium citrate, sodium dodecyl benzene sulfonate, sodium polyacrylate and polyethylene glycol.
6. The waste glass powder-doped reactive powder concrete according to claim 1, which is characterized in that: the length of the steel fiber is 12-15 mm.
7. The waste glass powder-doped reactive powder concrete according to claim 1, which is characterized in that: the activity excitant is at least three combinations selected from polyethylene, ether cyclic polydimethylsiloxane, calcium sulphoaluminate and calcium sulfate.
8. A preparation method of waste glass powder doped reactive powder concrete is characterized by comprising the following steps: the waste glass powder-doped reactive powder concrete comprises the raw materials as set forth in any one of claims 1 to 7, and comprises the following steps:
(1) adding silica sand into a mixture of cement, silica fume, waste glass powder, an active excitant and a water reducing agent, and uniformly stirring to obtain a dry mixture;
(2) adding water into the dry mixture, adding steel fibers when the dry mixture is mixed until the fluidity reaches 150-200, adding a high-efficiency dispersing agent after the dry mixture is uniformly mixed, and continuously stirring until the fluidity is 230-300 to obtain a mixture;
(3) pouring the mixture into a mold, performing vibration molding, curing for 20-24 hours at normal temperature, removing the mold, and performing water covering curing for 80-90 days.
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