CN111484290A - Super-retarding concrete - Google Patents
Super-retarding concrete Download PDFInfo
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- CN111484290A CN111484290A CN202010323972.XA CN202010323972A CN111484290A CN 111484290 A CN111484290 A CN 111484290A CN 202010323972 A CN202010323972 A CN 202010323972A CN 111484290 A CN111484290 A CN 111484290A
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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
-
- 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 relates to the technical field of building materials, in particular to super-retarding concrete; the composite material comprises the following raw materials in parts by weight: 250 parts of cement 210-doped material, 30-50 parts of admixture, 3-5 parts of basalt fiber, 8-10 parts of additive, 810 parts of river sand 805-doped material, 1010 parts of stone 985-doped material and 170 parts of water 165-doped material, wherein the additive comprises a water reducing agent, a retarder, a water retaining agent and a defoaming agent, and the weight ratio of the water reducing agent to the retarder to the water retaining agent to the defoaming agent is (6-8): (7-9): (3-5): (1-2), wherein the admixture consists of phosphorus slag, fly ash and microbeads, and the weight ratio of the phosphorus slag to the fly ash to the hollow glass microbeads is (10-20): (40-50): (10-15). According to the invention, the cement, the admixture, the basalt fiber, the admixture, the river sand, the stones and the water are reasonably proportioned, and the raw materials are matched with each other to obtain the super-retarding concrete with higher strength and longer setting time, and the super-retarding concrete can be subjected to pumping construction, is not easy to generate segregation and delamination, and has important significance for the development of the concrete industry.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to super-retarding concrete.
Background
Along with the development of society and the needs of various large-scale projects, the application range of concrete is continuously expanded, the performance requirements on the concrete are higher and higher, the setting time of the concrete is required to be prolonged in many large-scale projects in order to meet the requirements of construction procedures and construction duration, the setting mechanical strength is required to be ensured, and meanwhile, the phenomena of segregation and bleeding before and after concrete pouring do not occur, so that the construction quality is influenced.
The ultra-retarded concrete requires a long setting time in the early stage of the concrete and must have sufficient mechanical strength. From the viewpoint of material science, the contradiction brings certain difficulties to the research of the super concrete. The super-retarding concrete is widely applied to drilling secant piles of maintenance structures such as subways and the like due to the unique performance of the super-retarding concrete. The arrangement form of the secant pile is generally that an A pile (plain concrete pile) and a B pile (reinforced concrete pile) are arranged at intervals, the A pile is constructed firstly and the B pile is constructed secondly during construction, the concrete of the A pile adopts super-retarding concrete, and the B pile must be completed before the concrete of the A pile is initially set. Because the super-retarding and the concrete strength development are contradictory from the material science perspective, the super-retarding concrete used in the occlusive pile is generally used for meeting the setting time requirement of 60-80 h, the strength requirement is lower, and the general strength requirement is C15 or C20. Therefore, the research of the super-retarding concrete with higher strength and longer setting time is a technical problem to be solved urgently at present.
In view of the above, an ultra-retarded concrete is provided.
Disclosure of Invention
The invention aims to provide super-retarding concrete to solve the problems in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
the super-retarding concrete comprises the following raw materials in parts by weight: 250 parts of cement 210-doped material, 30-50 parts of admixture, 3-5 parts of basalt fiber, 8-10 parts of additive, 810 parts of river sand 805-doped material, 1010 parts of stone 985-doped material and 170 parts of water 165-doped material, wherein the additive comprises a water reducing agent, a retarder, a water retaining agent and a defoaming agent, and the weight ratio of the water reducing agent to the retarder to the water retaining agent to the defoaming agent is (6-8): (7-9): (3-5): (1-2), wherein the admixture consists of phosphorus slag, fly ash and microbeads, and the weight ratio of the phosphorus slag to the fly ash to the hollow glass microbeads is (10-20): (40-50): (10-15).
Preferably, the cement is ordinary portland cement, and the cement strength grade is 42.5.
Preferably, the basalt fiber has the density of 2.8-3.3g/cm3, the fiber length of 3-6mm, the fiber diameter of 15-16 mu m, the tensile strength of 3500-4500MPa and the tensile elastic modulus of 85-95 GPa.
Preferably, the river sand is natural river sand, the apparent density is 2600-2800kg/m3, the fineness modulus is 2.2, and the gradation is continuous.
Preferably, the stones are crushed stones, and the particle size is 5-20 mm.
Preferably, the fineness of the phosphorous slag is 30 mu m, the screen residue is less than or equal to 40 percent, and the P2O5 is less than or equal to 3.5 percent; the fly ash is F-class II-grade fly ash with the density of 2.3kg/m3(ii) a The particle size of the hollow glass beads is 5-15 mu m, and the bulk density is more than or equal to 700kg/m3The content of silicon dioxide is more than or equal to 50 percent.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 28%.
Preferably, the retarder consists of citric acid and sodium gluconate, and the weight ratio of the citric acid to the sodium gluconate is (1-3): (3-5).
Preferably, the water retaining agent is carboxymethyl cellulose ether.
Preferably, the defoamer is a polyether modified silicone defoamer.
Further, the super-retarding concrete provided by the invention is prepared by the following steps: metering the raw materials, feeding and stirring the cement, the admixture, the river sand, the stones and the water for 20 seconds, then feeding and continuously stirring the basalt fibers for 40 seconds, discharging the basalt fibers, conveying the basalt fibers into a stirring and transporting vehicle, continuously stirring (the rotating speed of a tank body is 5-10 revolutions per minute), homogenizing, and pumping and pouring the basalt fibers on a construction site.
Furthermore, by using the admixture with special proportion and components, compared with the traditional admixture of fly ash, mineral powder and silica fume, the admixture using the proportion of the scheme can improve the rheological property, reduce the hydration heat, reduce the slump loss, improve the pore structure and the mechanical property of a concrete structure, and improve the mechanical strength and the durability; mainly because the average particle size of the common cement is 20-30 mu m and the particles smaller than 10 mu m are not enough, the admixture with the proportion of the scheme is required to be filled among cement particles, so that mutual cohesion of the cement particles is prevented, the hydration reaction of concrete is facilitated, the filling property of the concrete can be greatly improved, the porosity is greatly reduced, and the mechanical strength and the durability of the concrete are further improved.
Furthermore, the retarder with special proportion and components can adsorb the surface of the manufactured cement particles to form a compact adsorption film layer, so that the double electric layer structure on the surface of the cement particles is changed, the process of water adsorption and hydration reaction of the cement particles are inhibited, and the effect of delaying hydration is achieved; in addition, acid radical ions in retarder molecules can perform complexation with calcium ions in a concrete system, inhibit crystallization of calcium hydroxide, and further prolong the induction period of cement hydration.
Furthermore, the short basalt fibers can be uniformly dispersed in the concrete, the internal structure of the concrete is more compact through mutual overlapping and crossing of the basalt fibers, and when the concrete is subjected to the splitting tensile strength test, the concrete can be stressed to generate cracks, the expansion can be further restrained, and the effect of improving the tensile strength of the concrete is achieved.
The invention has the beneficial effects that the cement, the admixture, the basalt fiber, the admixture, the river sand, the stones and the water are reasonably proportioned, and the raw materials are matched with each other to obtain the ultra-retarded concrete with higher strength and longer setting time, and the ultra-retarded concrete can be subjected to pumping construction, is not easy to generate segregation and delamination, and has important significance for the development of the concrete industry.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following embodiments, unless otherwise specified, the technical means used are conventional means well known to those skilled in the art.
Example 1
In this embodiment, the super-retarding concrete comprises the following raw materials in parts by weight: 210 parts of cement, 30 parts of admixture, 3 parts of basalt fiber, 8 parts of additive, 805 parts of river sand, 985 parts of stone and 165 parts of water, wherein the additive comprises a water reducing agent, a retarder, a water-retaining agent and a defoaming agent, and the weight ratio of the water reducing agent to the retarder to the water-retaining agent to the defoaming agent is 6: 7: 3: 1, the admixture consists of phosphorus slag, fly ash and microbeads, wherein the weight ratio of the phosphorus slag to the fly ash to the hollow glass microbeads is 10: 40: 10.
preferably, the cement is ordinary portland cement, and the cement strength grade is 42.5.
Preferably, the basalt fiber has the density of 2.8-3.3g/cm3, the fiber length of 3-6mm, the fiber diameter of 15-16 mu m, the tensile strength of 3500-4500MPa and the tensile elastic modulus of 85-95 GPa.
Preferably, the river sand is natural river sand, the apparent density is 2600-2800kg/m3, the fineness modulus is 2.2, and the gradation is continuous.
Preferably, the stones are crushed stones, and the particle size is 5-20 mm.
Preferably, the fineness of the phosphorous slag is 30 mu m, the screen residue is less than or equal to 40 percent, and the P2O5 is less than or equal to 3.5 percent; the fly ash is F-class II-grade fly ash with the density of 2.3kg/m3(ii) a The particle size of the hollow glass beads is 5-15 mu m, and the bulk density is more than or equal to 700kg/m3The content of silicon dioxide is more than or equal to 50 percent.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 28%.
Preferably, the retarder consists of citric acid and sodium gluconate, and the weight ratio of the citric acid to the sodium gluconate is 1: 3.
preferably, the water retaining agent is carboxymethyl cellulose ether.
Preferably, the defoamer is a polyether modified silicone defoamer.
Example 2
In this embodiment, the super-retarding concrete comprises the following raw materials in parts by weight: 250 parts of cement, 50 parts of admixture, 5 parts of basalt fiber, 10 parts of admixture, 810 parts of river sand, 1010 parts of stone and 170 parts of water, wherein the admixture is composed of a water reducing agent, a retarder, a water-retaining agent and a defoaming agent, and the weight ratio of the water reducing agent to the retarder to the water-retaining agent to the defoaming agent is 8: 9: 5: 2, the admixture is composed of phosphorus slag, fly ash and microbeads, and the weight ratio of the phosphorus slag to the fly ash to the hollow glass microbeads is 20: 50: 15.
preferably, the retarder consists of citric acid and sodium gluconate, and the weight ratio of the citric acid to the sodium gluconate is 3: 5.
example 3
In this embodiment, the super-retarding concrete comprises the following raw materials in parts by weight: 220 parts of cement, 40 parts of admixture, 4 parts of basalt fiber, 9 parts of additive, 808 parts of river sand, 990 parts of stone and 168 parts of water, wherein the additive is composed of a water reducing agent, a retarder, a water-retaining agent and a defoaming agent, and the weight ratio of the water reducing agent to the retarder to the water-retaining agent to the defoaming agent is 7: 8: 4: 1.5, the admixture is composed of phosphorus slag, fly ash and microbeads, and the weight ratio of the phosphorus slag, the fly ash and the hollow glass microbeads is 15: 45: 12.
preferably, the retarder consists of citric acid and sodium gluconate, and the weight ratio of the citric acid to the sodium gluconate is 2: 4.
example 4
In this embodiment, the super-retarding concrete comprises the following raw materials in parts by weight: 240 parts of cement, 45 parts of admixture, 4.5 parts of basalt fiber, 9.5 parts of additive, 809 parts of river sand, 1000 parts of stone and 169 parts of water, wherein the additive comprises a water reducing agent, a retarder, a water-retaining agent and a defoaming agent, and the weight ratio of the water reducing agent to the retarder to the water-retaining agent to the defoaming agent is 7.5: 8.5: 4.5: 1.8, the admixture is composed of phosphorus slag, fly ash and microbeads, and the weight ratio of the phosphorus slag, the fly ash and the hollow glass microbeads is 16: 48: 14.
preferably, the retarder consists of citric acid and sodium gluconate, and the weight ratio of the citric acid to the sodium gluconate is 2.5: 3.5.
comparative example 1
The components of the super-retarding concrete in the comparative example are the same as those in example 1, and are not repeated here, except that the weight ratio of the phosphorus slag, the fly ash and the hollow glass beads in the comparative example is 9: 39: 9.
comparative example 2
The components of the super-retarding concrete in the comparative example are the same as those in example 1, and are not repeated here, except that the weight ratio of the phosphorus slag, the fly ash and the hollow glass beads in the comparative example is 21: 51: 16.
comparative example 3
The ingredients of the super-retarding concrete in the comparative example are the same as those in example 1, and are not described again, except that phosphorous slag is not added in the comparative example.
Comparative example 4
The components of the ultra-retarded concrete in the comparative example are the same as those in example 1, and are not described again, except that the hollow glass beads are not doped in the comparative example.
Comparative example 5
The components of the super-retarding concrete in the comparative example are the same as those in example 1, and are not repeated here, except that the weight ratio of citric acid to sodium gluconate in the comparative example is 0.9: 2.9.
comparative example 6
The components of the super-retarding concrete in the comparative example are the same as those in example 1, and are not repeated here, except that the weight ratio of citric acid to sodium gluconate in the comparative example is 3.1: 5.1.
comparative example 7
The ingredients of the super-retarding concrete in the comparative example are the same as those in example 1, and are not described again, except that citric acid is not added in the comparative example.
Comparative example 8
The components of the super-retarding concrete in the comparative example are the same as those in example 1, and are not repeated here, except that sodium gluconate is not added in the comparative example.
Comparative example 9
The components of the ultra-retarding concrete in the comparative example are the same as those in example 1, and are not repeated here, except that basalt fibers are not doped in the comparative example.
All the raw materials referred to in the examples of the present invention and comparative examples are commercially available, and the manufacturers of the specific raw materials are shown in Table 1.
TABLE 1 manufacturers of the respective raw materials
| Raw material | Manufacturer/origin |
| Cement | HUAXIN CEMENT Co.,Ltd. |
| River sand | Lulong |
| Stone | Jade field |
| Basalt fiber | WUHAN ZHONGDING ECONOMIC DEVELOPMENT Co.,Ltd. |
| Phosphorous slag | Beijing xingda broad-source commercial and trade company Limited |
| Fly ash | Beijing xingda broad-source commercial and trade company Limited |
| Hollow glass bead | SINOSTEEL MAANSHAN NEW MATERIAL TECHNOLOGY Co.,Ltd. |
| Polycarboxylic acid water reducing agent | Yunan Ouch science and technology Co., Ltd |
| Citric acid | Suzhou megahua chemical Co., Ltd |
| Sodium gluconate | Suzhou megahua chemical Co., Ltd |
| Carboxymethyl cellulose ether | Suzhou megahua chemical Co., Ltd |
| Polyether modified organic silicon defoaming agent | Suzhou megahua chemical Co., Ltd |
The test basis is as follows: GB/T50080-2016 test method for common concrete mixture performance and GB/T50081-2002 test method for common concrete mechanical property, and the test results of the examples and the comparative examples in the invention are shown in Table 2.
TABLE 2 test results of examples and comparative examples
As can be seen from Table 2, the super-retarded concrete obtained by reasonably proportioning the cement, the admixture, the basalt fibers, the admixture, the river sand, the stones and the water and mutually matching the raw materials has 60d compressive strength of more than 40MPa, 60d flexural strength of more than 6MPa and final setting time of more than 6000min, provides guarantee for concrete construction of occlusive piles and the like which need concrete strength and longer setting time, and has important significance for the development of the concrete industry.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the intention of all modifications, equivalents, improvements, and equivalents falling within the spirit and scope of the invention.
Claims (10)
1. The super-retarding concrete is characterized by comprising the following raw materials in parts by weight: 250 parts of cement 210-doped material, 30-50 parts of admixture, 3-5 parts of basalt fiber, 8-10 parts of additive, 810 parts of river sand 805-doped material, 1010 parts of stone 985-doped material and 170 parts of water 165-doped material, wherein the additive comprises a water reducing agent, a retarder, a water retaining agent and a defoaming agent, and the weight ratio of the water reducing agent to the retarder to the water retaining agent to the defoaming agent is (6-8): (7-9): (3-5): (1-2), wherein the admixture consists of phosphorus slag, fly ash and microbeads, and the weight ratio of the phosphorus slag to the fly ash to the hollow glass microbeads is (10-20): (40-50): (10-15).
2. The super retarding concrete according to claim 1, wherein the cement is ordinary portland cement, and the cement strength grade is 42.5.
3. The super slow setting concrete as claimed in claim 1, wherein the density of the basalt fiber is 2.8-3.3g/cm3The fiber length is 3-6mm, the fiber diameter is 15-16 μm, the tensile strength is 3500-4500MPa, and the tensile elastic modulus is 85-95 GPa.
4. The super retarding concrete as claimed in claim 1, wherein the river sand is natural river sand with apparent density of 2600-3The fineness modulus is 2.2, and grading is continuous.
5. The super slow setting concrete as claimed in claim 1, wherein the stones are crushed stones with a particle size of 5-20 mm.
6. The super retarding concrete of claim 1, wherein the fineness of the phosphorous slag is 30 μm, the screen residue is less than or equal to 40%, and P is P2O5Less than or equal to 3.5 percent; the fly ash is F-class II-grade fly ash with the density of 2.3kg/m3(ii) a The particle size of the hollow glass beads is 5-15 mu m, and the bulk density is more than or equal to 700kg/m3The content of silicon dioxide is more than or equal to 50 percent.
7. The super slow setting concrete of claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 28%.
8. The super-retarding concrete according to claim 1, wherein the retarder consists of citric acid and sodium gluconate, and the weight ratio of the citric acid to the sodium gluconate is (1-3): (3-5).
9. The super set retarding concrete of claim 1, wherein the water retaining agent is carboxymethyl cellulose ether.
10. The super slow setting concrete as claimed in claim 1, wherein the defoaming agent is polyether modified organic silicon defoaming agent.
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| CN202010323972.XA CN111484290A (en) | 2020-04-22 | 2020-04-22 | Super-retarding concrete |
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Cited By (5)
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| CN111995310A (en) * | 2020-09-02 | 2020-11-27 | 陈永霞 | Super-retarding concrete and preparation method thereof |
| CN112358244A (en) * | 2020-11-15 | 2021-02-12 | 海口海岛混凝土有限责任公司 | Pumping anti-permeability super-retarding concrete and preparation method thereof |
| CN113185226A (en) * | 2021-05-06 | 2021-07-30 | 广东东方混凝土有限公司 | Super-retarding concrete and preparation method thereof |
| CN113185233A (en) * | 2021-05-17 | 2021-07-30 | 中国五冶集团有限公司 | Super-retarding concrete and preparation method thereof |
| CN113461383A (en) * | 2021-07-12 | 2021-10-01 | 深圳市东大洋水泥制品有限公司 | Super-retarding concrete and preparation method thereof |
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| CN113461383A (en) * | 2021-07-12 | 2021-10-01 | 深圳市东大洋水泥制品有限公司 | Super-retarding concrete and preparation method thereof |
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Application publication date: 20200804 |