CN113716907A - Preparation method of RPC cement concrete - Google Patents
Preparation method of RPC cement concrete Download PDFInfo
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- CN113716907A CN113716907A CN202111109009.2A CN202111109009A CN113716907A CN 113716907 A CN113716907 A CN 113716907A CN 202111109009 A CN202111109009 A CN 202111109009A CN 113716907 A CN113716907 A CN 113716907A
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- 239000004568 cement Substances 0.000 title claims abstract description 60
- 239000004567 concrete Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000004576 sand Substances 0.000 claims abstract description 37
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 34
- 239000002245 particle Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000012856 packing Methods 0.000 claims description 8
- 229910021487 silica fume Inorganic materials 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 3
- 239000003469 silicate cement Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 9
- 239000002002 slurry Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 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
- 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
-
- 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
- C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of constructional engineering, relates to a preparation method of RPC cement concrete, and more particularly relates to a gangue silicate cement clinker and a preparation method thereof. The technical points are as follows: s1, mixing the sea sand and the steel fiber, and stirring uniformly; s2, adding a cementing material in the step S1, and uniformly mixing the materials in a dry mode; s3, adding water and a water reducing agent into the step S2, stirring and discharging; wherein in step S3, the water amount is accurately controlled, and the cementing material comprises cement and a cement admixture. According to the preparation method of the RPC cement concrete, provided by the invention, the water consumption and the use amount of the cementing material in the cement concrete are accurately controlled aiming at a small amount of shell powder and high salinity in the sea sand, so that the adverse effects of the high salinity of the sea sand and the shell powder on the frost resistance, the impermeability and the durability of the concrete are avoided.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and relates to a preparation method of RPC cement concrete.
Background
The construction sea sand is generally mined from shallow sea and near the coast, mainly comprises coarse medium sand and contains partial gravel. On one hand, the sea sand has lower mud content, excellent grain shape and moderate fineness compared with river sand, and is very suitable for being used as a building material; on the other hand, ions, shells and other substances in the sea sand reduce the engineering quality and limit the application range of the sea sand. UK, Denmark, Japan, etc. have become relatively mature with respect to the use of sea sand in coastal construction projects and have established well established standards and regulations. The construction is carried out according to the standard, and the sea sand concrete can completely replace river sand. However, when the sea sand concrete is applied to bridge construction, the cement concrete has insufficient tensile strength, poor cooperative deformation capability and insufficient shear resistance between the cement concrete and the asphalt surface layer, and is easy to generate shear failure.
Disclosure of Invention
The invention aims to provide a preparation method of RPC cement concrete, which aims at small amount of shell powder and high salinity in sea sand, and accurately controls the water consumption and the cementing material consumption in the cement concrete, thereby avoiding the adverse effects of the high salinity of the sea sand and the shell powder on the frost resistance, the impermeability and the durability of the concrete.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a preparation method of RPC cement concrete, which comprises the following operation steps:
s1, mixing the sea sand and the steel fiber, and stirring uniformly;
s2, adding a cementing material in the step S1, and uniformly mixing the materials in a dry mode;
s3, adding water and a water reducing agent into the step S2, stirring and discharging;
wherein in the step S3, the water quantity is accurately controlled, and the cementing material comprises cement and a cement admixture. Accurately controlling the water consumption, and not allowing the RPC mixture to be discharged from the stirrer and added with water; the stirring time of the first stirring for 2min cannot be too short, otherwise, the steel fibers cannot be uniformly dispersed, and the steel fibers are agglomerated after cement and other powder materials are added; the RPC mixture has the advantages of rapid solidification rate at normal temperature, high brighness, easy wall adhesion, and uniform stirring, and is preferably molded within 15 min.
Further, the cement admixture comprises silica fume, fly ash, ground mineral powder, steel slag powder and limestone powder. The RPC cement concrete disclosed by the invention is added with the steel slag powder, so that the toughness and ductility of the concrete are improved.
Furthermore, the water-to-gel ratio of the cementing material is 0.18-0.22. In the case of a given raw material, the water-to-gel ratio is a factor determining the strength of the RPC and is also an important factor affecting its durability and workability. Therefore, the water-gel ratio is selected to meet the requirements of strength, durability and workability at the same time, and when the water-gel ratio is lower than 0.18, the forming is difficult, the compactness is reduced, and certain damage is brought to the strength and the durability; when the water-to-gel ratio is more than 0.22, workability is good, but the strength is also lowered to some extent.
Further, the cement slurry amount is determined according to the porosity of the cement after dense packing. The properties of the hardened cement-based material are closely related to the stacking state of the cementing material powder. The cementing materials with different particle diameters are mutually filled, so that the cementing material powder before being mixed with water can be compactly stacked.
Further, the compact packing porosity of the cementitious material is: P-1-VTighten up/VWatch (A)In which V isTighten upVolume at which the cementitious material is densely packed, VWatch (A)Is the normal volume of the cement.
Further, the volume of the amount of cement paste is Vp＝n(VWatch (A)-VTighten up) and/P, wherein n is a residue coefficient.
Further, the water-to-gel ratio of the cement calculates the volume of cement and the volume of water.
Further according to the formula
And calculating the water consumption, wherein W is the water volume, beta is a coefficient about 1, and B is the salinity in the sea sand.
Furthermore, the mixing amount of the silica fume is 10-15% of the mass of the cement admixture.
Furthermore, in the cementing material, the equivalent diameter ratio of particles with the particle size of less than 10 μm to particles with the particle size of less than 10 μm is (6-8): 1. along with the increase of the volume content ratio of the large particles, the void ratio of the two-phase particles is gradually reduced, and after the void ratio reaches a minimum value, the void ratio of the particles gradually rises. The cement particle size in the cementing material is the largest, the fly ash and the mineral powder are the second order, and the silica fume is the smallest. The fine particles of the mineral admixture are uniformly distributed in the cement paste and become the core of a large amount of hydration product precipitation, and along with the increase of the hydration age, the fine particles and the hydration products fill gaps and capillary pores, improve the pore structure of concrete and increase the compactness. If the cementing material powder is mixed in a proper proportion, the powder can have good continuous gradation, so that the total porosity of the composite cementing material system after setting and hardening is further reduced, and the defect of poor impermeability of sea sand concrete is overcome.
Furthermore, steam curing is adopted after the RPC cement concrete is formed.
In conclusion, the invention has the following beneficial effects:
the invention accurately controls the water consumption and the cementing material consumption in the cement concrete aiming at a small amount of shell powder and high salinity in the sea sand, thereby avoiding the adverse effects of the high salinity of the sea sand and the shell powder on the frost resistance, the impermeability and the durability of the concrete.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the specific embodiments, features and effects of the RPC cement concrete according to the present invention are described in detail below.
Example 1
A preparation method of RPC cement concrete comprises the following operation steps according to parts by weight:
s1, mixing 40 parts of sea sand and 0.5 part of steel fiber, and stirring uniformly;
s2, adding 30 parts of cementing material in the step S1, and uniformly mixing in a dry mode;
s3, adding the water and 0.01 part of water reducing agent which are accurately calculated in the step S2, stirring and discharging.
Wherein the total amount of cementitious material and the total amount of water are calculated by the following formulas:
the close packed porosity of the cement is: P-1-VTighten up/VWatch (A)In which V isTighten upVolume at which the cementitious material is densely packed, VWatch (A)Normal volume of cementitious material; volume of cementitious slurry amount is Vp＝n(VWatch (A)-VTighten up) The residue coefficient is/P, wherein n is the residue coefficient; calculating the volume of the cementing material and the volume of water according to the water-gel ratio of the cementing material and the formula
And calculating the water consumption, wherein W is the water volume, beta is a coefficient about 1, and B is the salinity in the sea sand. Salinity of the sea sand, compact packing volume of the cementitious material, and normal volume of cementitious material can all be tested by means conventional in the art, with a water-to-gel ratio of 0.22 being chosen.
Example 2: a preparation method of RPC cement concrete comprises the following operation steps according to parts by weight:
s1, mixing 45 parts of sea sand and 0.8 part of steel fiber, and stirring uniformly;
s2, adding 32 parts of cementing material in the step S1, and uniformly mixing the materials in a dry mode;
s3, adding the water and 0.03 part of water reducing agent which are accurately calculated in the step S2, stirring and discharging.
Wherein the total amount of cementitious material and the total amount of water are calculated by the following formulas:
the close packed porosity of the cement is: P-1-VTighten up/VWatch (A)In which V isTighten upVolume at which the cementitious material is densely packed, VWatch (A)Normal volume of cementitious material; volume of cementitious slurry amount is Vp＝n(VWatch (A)-VTighten up) The residue coefficient is/P, wherein n is the residue coefficient; calculating the volume of the cementing material and the volume of water according to the water-gel ratio of the cementing material and the formula
And calculating the water consumption, wherein W is the water volume, beta is a coefficient about 1, and B is the salinity in the sea sand. Salinity of the sea sand, compact packing volume of the cementitious material, and normal volume of cementitious material can all be obtained by testing by conventional means in the art, with a water-to-gel ratio of 0.20 being chosen.
Example 3: a preparation method of RPC cement concrete comprises the following operation steps according to parts by weight:
s1, mixing 45 parts of sea sand and 0.4 part of steel fiber, and stirring uniformly;
s2, adding 32 parts of cementing material in the step S1, and uniformly mixing the materials in a dry mode;
s3, adding the water and 0.03 part of water reducing agent which are accurately calculated in the step S2, stirring and discharging.
Wherein the total amount of cementitious material and the total amount of water are calculated by the following formulas:
the close packed porosity of the cement is: P-1-VTighten up/VWatch (A)In which V isTighten upVolume at which the cementitious material is densely packed, VWatch (A)Normal volume of cementitious material; volume of cementitious slurry amount is Vp＝n(VWatch (A)-VTighten up) The residue coefficient is/P, wherein n is the residue coefficient; calculating the volume of the cementing material and the volume of water according to the water-gel ratio of the cementing material and the formula
And calculating the water consumption, wherein W is the water volume, beta is a coefficient about 1, and B is the salinity in the sea sand. Salinity of the sea sand, compact packing volume of the cementitious material, and normal volume of cementitious material can all be obtained by testing by means conventional in the art; the water-to-glue ratio was chosen to be 0.18.
Example 4: a preparation method of RPC cement concrete comprises the following operation steps according to parts by weight:
s1, mixing 38 parts of sea sand and 0.5 part of steel fiber, and stirring uniformly;
s2, adding 32 parts of cementing material in the step S1, and uniformly mixing the materials in a dry mode;
s3, adding the water and 0.01 part of water reducing agent which are accurately calculated in the step S2, stirring and discharging.
Wherein the total amount of cementitious material and the total amount of water are calculated by the following formulas:
the close packed porosity of the cement is: P-1-VTighten up/VWatch (A)In which V isTighten upVolume at which the cementitious material is densely packed, VWatch (A)Normal volume of cementitious material; volume of cementitious slurry amount is Vp＝n(VWatch (A)-VTighten up) The residue coefficient is/P, wherein n is the residue coefficient; calculating the volume of the cementing material and the volume of water according to the water-gel ratio of the cementing material and the formula
And calculating the water consumption, wherein W is the water volume, beta is a coefficient about 1, and B is the salinity in the sea sand. Salinity of the sea sand, compact packing volume of the cementitious material, and normal volume of cementitious material can all be obtained by testing by conventional means in the art, with a water-to-gel ratio of 0.21 being chosen.
Comparative examples
A preparation method of river sand cement concrete comprises the following operation steps of:
s1, mixing 38 parts of river sand and 0.5 part of steel fiber, and stirring uniformly;
s2, adding 32 parts of cementing material in the step S1, and uniformly mixing the materials in a dry mode;
s3, adding the water and 0.01 part of water reducing agent which are accurately calculated in the step S2, stirring and discharging.
Wherein the total amount of cementitious material and the total amount of water are calculated by the following formulas:
the close packed porosity of the cement is: P-1-VTighten up/VWatch (A)In which V isTighten upVolume at which the cementitious material is densely packed, VWatch (A)Normal volume of cementitious material; volume of cementitious slurry amount is Vp＝n(VWatch (A)-VTighten up) The residue coefficient is/P, wherein n is the residue coefficient; calculating the volume of the cementing material and the volume of water according to the water-gel ratio of the cementing material and the formula
And calculating the water consumption, wherein W is the water volume, beta is a coefficient about 1, and B is the salinity in the sea sand. Salinity of the sea sand, compact packing volume of the cementitious material, and normal volume of cementitious material can all be obtained by testing by conventional means in the art, with a water-to-gel ratio of 0.21 being chosen.
And (3) performance testing: the concrete of examples 1 to 4 and comparative example was tested for properties
Testing the 28d seepage pressure resistance according to the standard of test methods for long-term performance and durability of common concrete (GB 50082-2009T);
testing the toughness according to a bending toughness method specified in the technical Specification for fiber concrete application (JGJ/T221-2010);
examples 1 to 4 and comparative examples were tested according to the standard for testing methods for long-term performance and durability of ordinary concrete (GBT50082-2009) for sulfate erosion resistance test;
the results are as follows:
TABLE 1 Performance test results for examples 1-4
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The preparation method of the RPC cement concrete is characterized by comprising the following operation steps:
s1, mixing the sea sand and the steel fiber, and stirring uniformly;
s2, adding a cementing material in the step S1, and uniformly mixing the materials in a dry mode;
s3, adding water and a water reducing agent into the step S2, stirring and discharging;
wherein in the step S3, the water quantity is accurately controlled, and the cementing material comprises cement and a cement admixture.
2. The method of claim 1, wherein the cement admixture comprises silica fume, fly ash, ground mineral powder, steel slag powder and limestone powder.
3. The method for preparing RPC cement concrete according to claim 1, wherein the cement has a water-to-gel ratio of 0.18-0.22.
4. The method of claim 3, wherein the cement paste amount is determined according to the porosity of the cement after dense packing.
5. The method of claim 4, wherein the compacted and piled porosity of the cement is: p =1-VTighten up/VWatch (A)In which V isTighten upVolume at which the cementitious material is densely packed, VWatch (A)Is the normal volume of the cement.
6. The method of claim 5, wherein the cement paste has a volume Vp=n(VWatch (A)-VTighten up) and/P, wherein n is a residue coefficient.
7. The method of claim 6, wherein the volume of the cement and the volume of water are calculated according to the water-to-gel ratio of the cement.
8. The method for preparing RPC cement concrete according to claim 2, wherein the amount of silica fume is 10-15% of the mass of the cement admixture.
9. The method for preparing RPC cement concrete according to claim 1, wherein the equivalent diameter ratio of the particles with the particle size of less than 10 μm to the particles with the particle size of less than 10 μm in the cement is (6-8): 1.
10. the method for preparing RPC cement concrete according to any one of claims 1-9, wherein steam curing is adopted after the RPC cement concrete is formed.
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| CN202111109009.2A CN113716907A (en) | 2021-09-22 | 2021-09-22 | Preparation method of RPC cement concrete |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105084837A (en) * | 2015-08-14 | 2015-11-25 | 黄贺明 | Sea sand powder concrete |
| CN105801017A (en) * | 2014-12-29 | 2016-07-27 | 中国建筑材料科学研究总院 | Normal-temperature maintenance-type active powder concrete and preparation method thereof |
| CN110502723A (en) * | 2019-07-26 | 2019-11-26 | 北京建筑大学 | A kind of ready-mixed concrete mixing proportion design method |
| CN111848046A (en) * | 2020-07-30 | 2020-10-30 | 浙江大学 | Mix proportion design method of recycled brick-concrete pervious concrete and application thereof |
| KR102213185B1 (en) * | 2019-10-31 | 2021-02-05 | 한국건설기술연구원 | High Performance Cementitious Composites for Shielding Electromagnetic Pulse |
-
2021
- 2021-09-22 CN CN202111109009.2A patent/CN113716907A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105801017A (en) * | 2014-12-29 | 2016-07-27 | 中国建筑材料科学研究总院 | Normal-temperature maintenance-type active powder concrete and preparation method thereof |
| CN105084837A (en) * | 2015-08-14 | 2015-11-25 | 黄贺明 | Sea sand powder concrete |
| CN110502723A (en) * | 2019-07-26 | 2019-11-26 | 北京建筑大学 | A kind of ready-mixed concrete mixing proportion design method |
| KR102213185B1 (en) * | 2019-10-31 | 2021-02-05 | 한국건설기술연구원 | High Performance Cementitious Composites for Shielding Electromagnetic Pulse |
| CN111848046A (en) * | 2020-07-30 | 2020-10-30 | 浙江大学 | Mix proportion design method of recycled brick-concrete pervious concrete and application thereof |
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Application publication date: 20211130 |