CN110563403A - combination of superfine sand pump concrete raw materials prepared by super-mixing technology - Google Patents
combination of superfine sand pump concrete raw materials prepared by super-mixing technology Download PDFInfo
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- CN110563403A CN110563403A CN201910880662.5A CN201910880662A CN110563403A CN 110563403 A CN110563403 A CN 110563403A CN 201910880662 A CN201910880662 A CN 201910880662A CN 110563403 A CN110563403 A CN 110563403A
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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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
- 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
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
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Abstract
the invention discloses a method for preparing a superfine sand pump concrete raw material combination by utilizing a super blending technology, which comprises the following steps: the raw materials prepared per cubic meter comprise the following components in kilograms by weight: 150-195 parts of cement, 50-100 parts of fly ash, 50-100 parts of granulated blast furnace slag powder, 400-650 parts of ultrafine sand, 450-600 parts of crushed stone with the thickness of 5-10 mm, 650-800 parts of crushed stone with the thickness of 10-31.5 mm, 160-185 parts of water and 4-12 parts of water reducing agent. The superfine sand super-graded pumping concrete has the advantages of low viscosity, good fluidity, small slump loss, guaranteed strength and the like, overcomes the problems of high viscosity, difficult pumping, large self-contraction, poor wear resistance, easy deformation and cracking and the like of the traditional superfine sand concrete mixture, can ensure that superfine sand can be more widely applied in engineering practice, and relieves the embarrassment of lack of natural medium sand resources.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a raw material combination for preparing ultrafine sand pumping concrete by utilizing a super-mixing technology.
Background
In the field of building materials, the thickness of sand is determined by the modulus of fineness (M) of the sandx) Is divided into four grades of coarse sand, medium sand, fine sand and ultra-fine sand, wherein the ultra-fine sand Mx1.5 to 0.7, and Mx<0.7 grit, referred to as ultra-fine sand or silt. Along with the continuous high-speed development of national economy and the construction of large-scale infrastructure, high-quality natural medium-coarse sand resources are gradually reduced, the situation that the medium-coarse sand resources are exhausted even in partial regions is generated, meanwhile, the ultrafine sand resources in the Yangtze river basin, the Jialing river system, the middle and lower yellow river, the Zhujiang river basin, the northwest and other regions in China are rich, the mining and the transportation are convenient, and a plurality of experts and scholars adopt ultrafine sand, machine-made sand and natural river sand to prepare mixed sand as concrete fine aggregates for preparing concrete, but the substitution amount of the ultrafine sand is small, so that the concrete cost is reduced and the resource utilization rate is limited.
Chinese application CN107265980A discloses a raw material composition of low-gel self-compacting concrete doped with ultrafine sand. In the method, the concrete comprises the following components in percentage by mass: 252-27 parts of cement; 54-70 parts of fly ash; 54-70 parts of mineral powder; 570-580 parts of superfine sand; 1002-1033 parts of stones; 165-173 parts of water; 6-7 parts of an additive. The problem of poor workability of pure machine-made sand concrete is mainly solved in the patent.
chinese application CN107814524A discloses a preparation method of extra-fine sand pump concrete. The application adopts the technical scheme that a certain amount of superfine sand is mixed into natural sand, and the mass percentage of the superfine sand is as follows: 42-80 parts of cement; 90-110 parts of fly ash; 130-150 parts of natural sand; 3-8 parts of limestone machine-made sand; 130-200 parts of extra-fine sand; 36-70 parts of water; 6-18 parts of a water reducing agent. The method disclosed by the patent increases the pumpability and the fluidity of the concrete, and reasonably utilizes the superfine sand.
From the applications, the application of the ultrafine sand mainly adopts the ultrafine sand, the machine-made sand and the natural river sand to prepare mixed sand as concrete fine aggregate for preparing the concrete, wherein the fineness modulus of the ultrafine sand is between 0.7 and 1.2, and the research and practice that only the ultrafine sand with the fineness modulus below 0.7 is adopted as the concrete fine aggregate are few. Because the superfine sand has the characteristics of small fineness modulus, small average particle size, poor particle grading, large mud content, high void ratio and large specific surface area, the superfine sand concrete mixture prepared by the conventional concrete preparation method has the problems of high viscosity, difficult pumping, large self-shrinkage, poor wear resistance, easy deformation and crack and the like, and cannot meet the requirements of the working performance and the mechanical performance of the pumped concrete.
Disclosure of Invention
The invention designs the mixing proportion of the superfine sand concrete with the fineness modulus of 0.6-0.7 by adopting a large-dosage stone super-grading technology with the particle size of 5-10 mm, and the prepared superfine sand concrete can meet the requirements of workability, constructability and strength required by conventional concrete, has the advantages of low viscosity, good fluidity, small slump loss, guaranteed strength and the like, can ensure that superfine sand can be more widely applied in engineering practice, relieves the embarrassment of lack of natural medium sand resources, and better protects the environment.
The invention is realized by the following technical scheme:
Preparing a superfine sand pumping concrete raw material combination by utilizing a super preparation technology: the raw materials for preparation per cubic meter comprise the following components:
150-195 kg of cement, 50-100 kg of fly ash, 50-100 kg of granulated blast furnace slag powder, 400-650 kg of superfine sand, 450-600 kg of crushed stone with the diameter of 5-10 mm, 650-800 kg of crushed stone with the diameter of 10-31.5 mm, 160-185 kg of water and 4-12 kg of water reducing agent.
the portland cement is ordinary portland cement with a cement strength grade of 42.5.
The concrete mineral admixture adopts the granulated blast furnace slag powder which has good activity, can improve the durability and the strength of the concrete, can effectively reduce the slump loss of the concrete, and simultaneously, the activity of the granulated blast furnace slag powder is closely related to the fineness of the mineral powder. The granulated blast furnace slag powder is granulated blast furnace slag powder with the grade of more than S95.
The invention replaces cement with a certain amount of fly ash, has certain improvement effect on the internal structure of the concrete, can increase the compactness of the concrete, and reduces the drying shrinkage of the concrete, thereby enhancing the crack resistance of the concrete;
secondly, the fly ash particles are spherical and can be used as a cementing material to effectively increase the cohesiveness of concrete, improve the workability of the concrete to a certain extent and improve the pumpability of the concrete; moreover, the fly ash can effectively reduce the temperature rise caused by the hydration heat of the concrete, and further improve the durability of the concrete. The fly ash is above grade II.
The fineness modulus Mx of the fine aggregate is 0.6-0.7, the preferable mud content of the fine aggregate is not more than 1.0 wt%, and the mud block content is not more than 0.5 wt%.
the coarse aggregate is prepared by mixing crushed stone with the particle size of 5-10 mm and crushed stone with the particle size of 10-31.5 mm, wherein the mass of the crushed stone with the particle size of 5-10 mm accounts for 32-48% of that of the coarse aggregate, the crushed stone is adopted to increase the bonding strength of an aggregate interface, the strength of a parent rock of the coarse aggregate is 1.7 times higher than the designed strength of concrete, the surface is required to be as clean as possible, the particle grading is continuous, the particle size of the maximum particle is not more than 20mm, the needle flake content is not more than 10 wt%, the mud content is not more than 1.0 wt%, and the mud block content is not more than 0.
The water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, the water reducing rate is 25%, and the solid content is 10%.
The preparation principle is as follows:
Low sand rate principle: the sand rate is an important factor influencing the performance of the superfine sand concrete, the fineness modulus of the sand is reduced, and the optimal sand rate for preparing the concrete is reduced. The superfine sand has small average grain size and extremely low fineness modulus, the use amount of coarse aggregates is reduced along with the increase of the sand rate, the specific surface area of the coarse and fine aggregates is increased, the cement use amount of concrete in unit volume needs to be greatly improved to ensure the workability of mixture and the strength of concrete, so that the viscosity of the mixture is increased, the flow rate is reduced, the plastic shrinkage and drying shrinkage are increased, and the possibility of deformation and cracking of the concrete is improved. The selection of lower sand rate is beneficial to improving and enhancing the performance of concrete, and the suitable sand rate range is between 24 percent and 32 percent.
Super-matching technology: in the preparation process of ultrafine sand concrete, referring to the grading requirement (table 1) of coarse aggregate in GB/T14685-2011 construction macadam and pebble, the concrete prepared when the residual coefficient of ultrafine sand is ensured to be 1.2 still has no fluidity, obviously, the specification is not applied to ultrafine sand concrete, and the main reasons are that the average particle size of ultrafine sand is small, the fineness modulus is extremely low, good slurry is difficult to form under a low sand rate, and the friction resistance formed by the accumulation of macadam cannot be broken through. Under the condition of increasing the consumption of the crushed stones of 5 mm-10 mm, although the coarse aggregate gradation of the superfine sand concrete exceeds the gradation requirement of the regulation of the crushed stones and pebbles for construction, the crushed stones of 5 mm-10 mm can not only effectively fill the gaps between the crushed stones, but also break through the frictional resistance between the crushed stones by means of the gravity of the crushed stones and the power provided by mechanical vibration, so as to provide good workability and mechanical property for the concrete, therefore, the reasonable mixing of the crushed stones of 5 mm-10 mm is the key for successful configuration of the concrete pumped by the superfine sand pump.
The invention has the following beneficial effects: the superfine sand super-graded pumping concrete has the advantages of low viscosity, good fluidity, small slump loss, guaranteed strength and the like, overcomes the problems of high viscosity, difficult pumping, large self-contraction, poor wear resistance, easy deformation and cracking and the like of the traditional superfine sand concrete mixture, can ensure that superfine sand can be more widely applied in engineering practice, and relieves the embarrassment of lack of natural medium sand resources.
Detailed Description
The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.
The invention adopts the following raw materials to prepare the concrete:
Cement: huaxin 42.5 grade ordinary portland cement.
Mineral powder: wuhansheng Dada grade S95 granulated blast furnace slag powder.
Fly ash: class II fly ash of Hanchuan power plants.
Fine aggregate: the fineness modulus Mx of the river sand in the Yangtze river midstream Hubei Honghu region is 0.62, and the accumulated screen residue A of a 4.75mm standard screen10.2%, 2.36mm standard sieve cumulative screen residue A20.4 percent, 1.18mm standard sieve cumulative screen residue A30.8%, 0.6mm standard sieve cumulative screen residue A41.0 percent, and 0.3mm standard sieve cumulative screen residue A513.5%, the cumulative screen residue of a standard screen of 0.15mm648.5 percent and 100 percent of sieve bottom.
According to GB/T14685-2001 'construction macadam and pebble' medium macadam and pebble particle grading regulation, the particle grading regulation of the macadam and the pebble is shown in a table 1:
Coarse aggregate: the melon and rice stones with the grain size of 5-10 mm and the broken stones with the grain size of 5-31.5 mm are selected and mixed for use.
Water: tap water.
Water reducing agent: the high-efficiency polycarboxylic acid high-efficiency water reducing agent has the water reducing rate of 25.0 percent and the solid content of 12.5 percent.
In order that the invention may be better understood, the invention will now be further described with reference to the following examples.
Example 1:
C20 superfine sand pumpPreparing the concrete: the design volume weight is 2355kg/m3The dosage of the cementing material is 305kg/m3The mixing amount of the water reducing agent is 1.8 percent, the water-glue ratio is 0.59 percent, and the sand rate is 33.6 percent.
TABLE 2C 20 design of mix ratio of ultra fine sand concrete (kg)
TABLE 3 test results of ultrafine Sand concrete of C20
Example 2:
Preparing C25 superfine sand pump concrete: the design volume weight is 2355kg/m3The dosage of the cementing material is 335kg/m3the mixing amount of the water reducing agent is 1.8 percent, the water-glue ratio is 0.52, and the sand rate is 32.5 percent.
TABLE 4C 25 design of mix ratio of ultra fine sand concrete (kg)
TABLE 5C 25 test results for ultrafine Sand concrete
Example 3:
preparing C30 superfine sand pump concrete: the design volume weight is 2356kg/m3The dosage of the cementing material is 375kg/m3The mixing amount of the water reducing agent is 1.73 percent, the water-glue ratio is 0.43, and the sand rate is 30 percent.
TABLE 6C 30 design of mix ratio of ultra fine sand concrete (kg)
TABLE 7 test results of ultrafine Sand concrete of C30
Example 4:
preparing C35 superfine sand pump concrete: the design volume weight is 2357kg/m3The dosage of the cementing material is 390kg/m3The mixing amount of the water reducing agent is 1.8 percent, the water-glue ratio is 0.41, and the sand rate is 30 percent.
TABLE 8C 35 design of mix ratio of ultra fine sand concrete (kg)
TABLE 9 test results of ultrafine Sand concrete of C35
The results of the examples illustrate that: the concrete performance characteristics of the raw materials are combined in the implementation example, the lower sand rate, the reasonable continuous grading design and the application of the high-efficiency water reducing agent are adopted, and the strength and the durability of the concrete are improved and the slump loss of the concrete is reduced through the S95-grade granulated blast furnace slag powder; the fly ash replaces cement to increase the cohesiveness and compactness of the concrete, improve the workability of the concrete and reduce the drying shrinkage of the concrete.
From the test results of each group, the freshly-mixed superfine sand concrete of each group has low viscosity and good workability, the slump of the concrete can meet the long-distance pumping requirement, and the strength of the hardened concrete can be stably developed to meet the design strength requirement of each group.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the essential characteristics or spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A raw material combination for preparing ultrafine sand pumping concrete by utilizing a super-mixing technology is characterized in that the raw materials for preparing the concrete per cubic meter comprise the following components:
150-195 kg of cement;
50-100 kg of fly ash;
50-100 kg of granulated blast furnace slag powder;
400-650 kg of superfine sand;
450-600 kg of 5-10 mm crushed stone;
650-800 kg of 10 mm-31.5 mm crushed stone;
160-185 kg of water;
4-12 kg of water reducing agent.
2. The ultra-fine sand pumping concrete raw material composition prepared by the super-batching technology as claimed in claim 1, is characterized in that: the cement is 42.5-grade ordinary portland cement, the grade of fly ash is greater than grade II, the grade of granulated blast furnace slag powder is greater than S95, and the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent with the water reducing rate of greater than 20%.
3. The ultra-fine sand pumping concrete raw material composition prepared by the super-batching technology as claimed in claim 2, is characterized in that: the water reducing rate of the water reducing agent is 25%, and the solid content is 10%.
4. The ultra-fine sand pumping concrete raw material composition prepared by the super-batching technology as claimed in claim 1, is characterized in that: the fineness modulus of the superfine sand is 0.6-0.7, and the sand rate is 24-35%.
5. the ultra-fine sand pumping concrete raw material composition prepared by the super-batching technology as claimed in claim 1, is characterized in that: the crushed stone with the diameter of 5mm to 10mm and the crushed stone with the diameter of 10mm to 31.5mm are mixed according to the proportion, wherein the crushed stone with the diameter of 5mm to 10mm accounts for 32 wt% -48 wt%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112358246A (en) * | 2020-11-20 | 2021-02-12 | 中铁二十局集团有限公司 | High-elevation pumping high-performance desert sand concrete and preparation method thereof |
-
2019
- 2019-09-18 CN CN201910880662.5A patent/CN110563403A/en active Pending
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| 常保全: "超特细砂泵送混凝土在利比亚10000套住宅项目中的应用", 《中国建材科技》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112358246A (en) * | 2020-11-20 | 2021-02-12 | 中铁二十局集团有限公司 | High-elevation pumping high-performance desert sand concrete and preparation method thereof |
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