CN111689724A - Machine-made sand concrete and preparation method thereof - Google Patents
Machine-made sand concrete and preparation method thereof Download PDFInfo
- Publication number
- CN111689724A CN111689724A CN202010587298.6A CN202010587298A CN111689724A CN 111689724 A CN111689724 A CN 111689724A CN 202010587298 A CN202010587298 A CN 202010587298A CN 111689724 A CN111689724 A CN 111689724A
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- parts
- machine
- made sand
- sand
- concrete
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- 239000004576 sand Substances 0.000 title claims abstract description 117
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000004575 stone Substances 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 29
- 239000010883 coal ash Substances 0.000 claims abstract description 25
- 239000000654 additive Substances 0.000 claims abstract description 23
- 230000000996 additive effect Effects 0.000 claims abstract description 23
- 239000008399 tap water Substances 0.000 claims abstract description 16
- 235000020679 tap water Nutrition 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 5
- 230000000740 bleeding effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007581 slurry coating 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
- C04B2111/00146—Sprayable or pumpable mixtures
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)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a machine-made sand concrete and a preparation method thereof, wherein the concrete comprises the following components: 120-200 parts of cement, 70-110 parts of coal ash, 750-1200 parts of broken stone, 400-750 parts of machine-made sand, 150-220 parts of tap water and 5-8 parts of an additive; the machine-made sand comprises 150-200 parts of coarse sand and 200-550 parts of fine sand. The invention has the fluidity (expansibility) of 550 +/-100 mm, is soft, has good construction pumping, low water-cement ratio and high strength, adopts artificial machine-made sand stones, and is environment-friendly and energy-saving.
Description
Technical Field
The invention relates to machine-made sand concrete and a preparation method thereof.
Background
At present, the concrete is prepared by machine-made broken stones and machine-made sand in multiple applications. Machine-made broken stones, poor gradation of machine-made sand, rough surface, multi-edge angles and poor grain shape, so that the mixed machine-made sand concrete has high water demand rate, easy segregation and poor pumpability. Particularly, when low-grade machine-made sand concrete is prepared, the using amount of a cementing material is small, the concrete is discrete, poor in cohesiveness, poor in water retention and poor in fluidity, and the pumping property and the construction performance cannot be guaranteed. Meanwhile, in the downward pumping process, sand and stone without slurry coating in the vertical pump pipe fall to the bottom of the pump pipe firstly, so that concrete is directly blocked; once the pumping is stopped in midway, the concrete in the pump pipe flows away under the action of pressure, sand and stone are left, and pipe blockage is easily caused; this problem has been addressed by increasing the amount of cement used to improve the workability of the concrete, which, while effective in avoiding pipe blockage by the concrete, increases the cost of the concrete. Therefore, there is a need to develop a low-grade machine-made sand concrete for a downward pumping track, which has the advantages of simple preparation process, low cost, excellent workability and pumpability, and can effectively solve the problems of downward pumpability and workability of the low-grade machine-made sand concrete, and avoid unnecessary loss caused by pipe blockage of the concrete.
Disclosure of Invention
Based on the defects of the prior art, the technical problem solved by the invention is to provide the machine-made sand concrete which is low in cost and easy to construct.
In order to solve the above technical problems, the present invention provides a machine-made sand concrete, comprising: 120-200 parts of cement, 70-110 parts of coal ash, 750-1200 parts of broken stone, 400-750 parts of machine-made sand, 150-220 parts of tap water and 5-8 parts of an additive; the machine-made sand comprises 150-200 parts of coarse sand and 200-550 parts of fine sand.
As an improvement of the technical scheme, the additive is a polycarboxylic acid water reducing agent.
As an improvement of the above technical solution, the machine-made sand concrete includes: 120 parts of cement, 85 parts of coal ash, 890 parts of broken stone, 560 parts of machine-made sand, 175 parts of tap water and 5 parts of an additive; the machine-made sand comprises 150 parts of coarse sand and 410 parts of fine sand.
As an improvement of the above technical solution, the machine-made sand concrete includes: 200 parts of cement, 110 parts of coal ash, 1140 parts of crushed stone, 650 parts of machine-made sand, 200 parts of tap water and 8 parts of an additive; wherein the machine-made sand comprises 200 parts of coarse sand and 450 parts of fine sand.
As an improvement of the above technical solution, the machine-made sand concrete includes: 185 parts of cement, 95 parts of coal ash, 1200 parts of broken stone, 750 parts of machine-made sand, 220 parts of tap water and 8 parts of an additive; the machine-made sand comprises 200 parts of coarse sand and 550 parts of fine sand.
As an improvement of the above technical solution, the machine-made sand concrete includes: 190 parts of cement, 80 parts of coal ash, 750 parts of broken stone, 450 parts of machine-made sand, 165 parts of tap water and 7 parts of an additive; the machine-made sand comprises 160 parts of coarse sand and 290 parts of fine sand.
The invention also aims to provide a preparation method of the machine-made sand concrete, which comprises the following steps:
s001: weighing cement, coal ash, broken stone, machine-made sand, an additive and water according to the mass ratio of each component;
s002: and (3) putting the weighed cement, coal ash, broken stone and machine-made sand into a concrete mixer, and dry-mixing the weighed cement, coal ash, broken stone and machine-made sand for 15-20min to obtain a fully-mixed dry material, adding water, stirring for 15min, slowly dropwise adding an additive, and continuously stirring for 2min to obtain the machine-made sand concrete.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the machine-made sand concrete, the cementing material is maximized, the design of the cementing material is maximized under the condition of low cement consumption, the cost is not increased, and the workability can be improved; the water-gel ratio stability strength is reduced; the using amount of sand and stone is reduced, and the unstable influence caused by the instability of the sand and the stone can be greatly reduced.
2. The machine-made sand concrete can overcome the defects of manpower (including inertia of people), greatly increase the effective application of machinery, greatly increase the effective utilization of wastes (green construction), effectively quantize and stabilize the concrete and has good pumping capacity.
3. The concrete of the invention has good expansion degree and slump and strong pumping capacity.
Detailed Description
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the contents of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments.
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
The invention relates to machine-made sand concrete, which comprises: 120-200 parts of cement, 70-110 parts of coal ash, 750-1200 parts of broken stone, 400-750 parts of machine-made sand, 150-220 parts of tap water and 5-8 parts of an additive; the machine-made sand comprises 150-200 parts of coarse sand and 200-550 parts of fine sand.
Further preferably, the admixture is a polycarboxylic acid water reducing agent,
example 1
The machine-made sand concrete includes: 120 parts of cement, 85 parts of coal ash, 890 parts of broken stone, 560 parts of machine-made sand, 175 parts of tap water and 5 parts of an additive; the machine-made sand comprises 150 parts of coarse sand and 410 parts of fine sand.
The preparation method is carried out as follows:
s001: weighing cement, coal ash, broken stone, machine-made sand, an additive and water according to the mass ratio of each component;
s002: and (3) putting the weighed cement, coal ash, broken stone and machine-made sand into a concrete mixer, and dry-mixing the weighed cement, coal ash, broken stone and machine-made sand for 15-20min to obtain a fully-mixed dry material, adding water, stirring for 15min, slowly dropwise adding an additive, and continuously stirring for 2min to obtain the machine-made sand concrete.
Example 2
The machine-made sand concrete includes: 200 parts of cement, 110 parts of coal ash, 1140 parts of crushed stone, 650 parts of machine-made sand, 200 parts of tap water and 8 parts of an additive; wherein the machine-made sand comprises 200 parts of coarse sand and 450 parts of fine sand.
The concrete of example 2 was prepared according to the preparation method of example 1.
Example 3
The machine-made sand concrete includes: 185 parts of cement, 95 parts of coal ash, 1200 parts of broken stone, 750 parts of machine-made sand, 220 parts of tap water and 8 parts of an additive; the machine-made sand comprises 200 parts of coarse sand and 550 parts of fine sand.
The concrete of example 3 was prepared according to the preparation method of example 1.
Example 4
The machine-made sand concrete includes: 190 parts of cement, 80 parts of coal ash, 750 parts of broken stone, 450 parts of machine-made sand, 165 parts of tap water and 7 parts of an additive; the machine-made sand comprises 160 parts of coarse sand and 290 parts of fine sand.
The concrete of example 4 was prepared according to the preparation method of example 1.
Description of the test results
(1) Testing of expansion, slump and compressive strength
For the concrete produced by the above 4 examples, the initial slump, initial expansion and 16h slump were measured, and for each example, 20 concrete samples molded by 150 × 150mm test molds were taken, and cured for 7 days and 28 days under the conditions of 20 ± 2 ℃ and relative humidity of more than 95%, and the average value of the experimental data was obtained, and the properties such as compressive strength were as follows:
in the embodiment, the average initial expansion of the machine-made sand concrete is 550 × 550mm, the 60-minute expansion is 620 × 620, the initial slump is 220mm and is far greater than the slump (80mm) of common concrete, and the concrete with the compressive strength performance of C30-C40 grade meets the regulation of GB50107-2010 concrete strength test evaluation standard.
(2) Bleeding and pumping pressure test
Conventional C30 is a comparative example comparing the bleeding rate, minimum pump pressure:
as seen from the table above, the bleeding rate and the minimum pumping pressure of the concrete are both smaller than those of the comparative example, which shows that the concrete has good workability, the pumping performance is ensured, and the problems of pipeline blockage and the like caused by concrete bleeding in the pumping process can be effectively prevented.
According to the machine-made sand concrete, the cementing material is maximized, the design of the cementing material is maximized under the condition of low cement consumption, the cost is not increased, and the workability can be improved; the water-gel ratio stability strength is reduced; the using amount of sand and stone is reduced, and the unstable influence caused by the instability of the sand and the stone can be greatly reduced. The machine-made sand concrete can overcome the defects of manpower (including inertia of people), greatly increase the effective application of machinery, greatly increase the effective utilization of wastes (green construction), effectively quantize and stabilize the concrete and has good pumping capacity.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (7)
1. A machine-made sand concrete, comprising: 120-200 parts of cement, 70-110 parts of coal ash, 750-1200 parts of broken stone, 400-750 parts of machine-made sand, 150-220 parts of tap water and 5-8 parts of an additive; the machine-made sand comprises 150-200 parts of coarse sand and 200-550 parts of fine sand.
2. The machine-made sand concrete of claim 1, wherein the admixture is a polycarboxylic acid water reducer.
3. The machine-made sand concrete of claim 1, comprising: 120 parts of cement, 85 parts of coal ash, 890 parts of broken stone, 560 parts of machine-made sand, 175 parts of tap water and 5 parts of an additive; the machine-made sand comprises 150 parts of coarse sand and 410 parts of fine sand.
4. The machine-made sand concrete of claim 1, comprising: 200 parts of cement, 110 parts of coal ash, 1140 parts of crushed stone, 650 parts of machine-made sand, 200 parts of tap water and 8 parts of an additive; wherein the machine-made sand comprises 200 parts of coarse sand and 450 parts of fine sand.
5. The machine-made sand concrete of claim 1, comprising: 185 parts of cement, 95 parts of coal ash, 1200 parts of broken stone, 750 parts of machine-made sand, 220 parts of tap water and 8 parts of an additive; the machine-made sand comprises 200 parts of coarse sand and 550 parts of fine sand.
6. The machine-made sand concrete of claim 1, comprising: 190 parts of cement, 80 parts of coal ash, 750 parts of broken stone, 450 parts of machine-made sand, 165 parts of tap water and 7 parts of an additive; the machine-made sand comprises 160 parts of coarse sand and 290 parts of fine sand.
7. The method for preparing machine-made sand concrete according to any one of claims 1 to 6, characterized by comprising the steps of:
s001: weighing cement, coal ash, broken stone, machine-made sand, an additive and water according to the mass ratio of each component;
s002: and (3) putting the weighed cement, coal ash, broken stone and machine-made sand into a concrete mixer, and dry-mixing the weighed cement, coal ash, broken stone and machine-made sand for 15-20min to obtain a fully-mixed dry material, adding water, stirring for 15min, slowly dropwise adding an additive, and continuously stirring for 2min to obtain the machine-made sand concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010587298.6A CN111689724A (en) | 2020-06-24 | 2020-06-24 | Machine-made sand concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010587298.6A CN111689724A (en) | 2020-06-24 | 2020-06-24 | Machine-made sand concrete and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111689724A true CN111689724A (en) | 2020-09-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202010587298.6A Pending CN111689724A (en) | 2020-06-24 | 2020-06-24 | Machine-made sand concrete and preparation method thereof |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624685A (en) * | 2020-12-08 | 2021-04-09 | 苏州良浦住宅工业有限公司 | Special machine-made sand composite material for external wall panel component and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013052952A2 (en) * | 2011-10-06 | 2013-04-11 | Cement Innovations, Llc | Cement additives and related methods of use |
| CN106278000A (en) * | 2015-05-21 | 2017-01-04 | 重庆建工住宅建设有限公司 | Large fluidity machine-made sand concrete and preparation method thereof |
| CN106904892A (en) * | 2017-03-28 | 2017-06-30 | 南宁市嘉大混凝土有限公司 | Half self-compacting concrete |
| CN106927739A (en) * | 2017-04-11 | 2017-07-07 | 广西南宁嘉泰水泥制品有限公司 | A kind of artificial sand concrete for improving pump-conveying property |
| CN109336482A (en) * | 2018-12-08 | 2019-02-15 | 徐州楚光能源科技有限公司 | A kind of machine-made sand concrete and preparation method thereof |
| CN110563413A (en) * | 2019-10-23 | 2019-12-13 | 中建西部建设贵州有限公司 | Low-grade machine-made sand concrete for downward pumping track and preparation method thereof |
-
2020
- 2020-06-24 CN CN202010587298.6A patent/CN111689724A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013052952A2 (en) * | 2011-10-06 | 2013-04-11 | Cement Innovations, Llc | Cement additives and related methods of use |
| CN106278000A (en) * | 2015-05-21 | 2017-01-04 | 重庆建工住宅建设有限公司 | Large fluidity machine-made sand concrete and preparation method thereof |
| CN106904892A (en) * | 2017-03-28 | 2017-06-30 | 南宁市嘉大混凝土有限公司 | Half self-compacting concrete |
| CN106927739A (en) * | 2017-04-11 | 2017-07-07 | 广西南宁嘉泰水泥制品有限公司 | A kind of artificial sand concrete for improving pump-conveying property |
| CN109336482A (en) * | 2018-12-08 | 2019-02-15 | 徐州楚光能源科技有限公司 | A kind of machine-made sand concrete and preparation method thereof |
| CN110563413A (en) * | 2019-10-23 | 2019-12-13 | 中建西部建设贵州有限公司 | Low-grade machine-made sand concrete for downward pumping track and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624685A (en) * | 2020-12-08 | 2021-04-09 | 苏州良浦住宅工业有限公司 | Special machine-made sand composite material for external wall panel component and preparation method thereof |
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Application publication date: 20200922 |