CN111333383A - Extra-coarse machine-made sand super-high layer pumping high-strength concrete - Google Patents
Extra-coarse machine-made sand super-high layer pumping high-strength concrete Download PDFInfo
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- CN111333383A CN111333383A CN202010099089.7A CN202010099089A CN111333383A CN 111333383 A CN111333383 A CN 111333383A CN 202010099089 A CN202010099089 A CN 202010099089A CN 111333383 A CN111333383 A CN 111333383A
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- made sand
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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
Abstract
The invention discloses extra-coarse machine-made sand super-high layer pumping high-strength concrete, which is prepared by mixing the following raw material components in percentage by mass: 400-420 kg of cement, 80-100 kg of mineral powder, 60-80 kg of fly ash, 20-40 kg of silica fume, 1000-1040 kg of extra-coarse machine-made sand, 660-680 kg of broken stone, 155-165 kg of water and 5.6-7.7 kg of an additive. The concrete is characterized in that fine aggregate is made of sand by adopting an extra-coarse machine, the fineness modulus reaches 3.6-4.1, the strength grade reaches C60 and above, the expansion degree is more than or equal to 680mm, the emptying time of a barrel pouring is less than or equal to 5.0s, the working performance is excellent, and the pumping construction requirement of super high-rise buildings can be met. The application of the invention realizes the super high-rise pumping of the extra coarse machine-made sand high-strength concrete and relieves the pressure of shortage of medium sand resources to a certain extent.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to extra-coarse machine-made sand super-high layer pumping high-strength concrete.
Background
The fine aggregate is an important composition material in concrete, and the traditional fine aggregate mainly adopts natural river sand, has the fineness of 2.3-3.0 and excellent performance. Since 2017, national environmental protection supervision and inspection are continuously upgraded, river sand is forbidden to be collected, and machine-made sand is used as a substitute, but the quality of the current machine-made sand is uneven, the machine-made sand in some regions is basically extra-coarse machine-made sand, the fineness modulus reaches 3.6-4.1, and no fine sand is used in a compounding way, and concrete produced by the extra-coarse machine-made sand has poor cohesiveness, is easy to segregate and bleed, has poor stability, and has great influence on the quality control and construction of the concrete.
With the increasing speed of urbanization, super high-rise buildings are increasing, which puts higher demands on the performance of concrete, especially high strength and pumpability. For fine aggregate, medium sand with excellent performance is usually needed to realize high strength and super high-rise pumping of concrete, but under the condition that only extra coarse machine-made sand is used as fine aggregate, realizing super high-rise pumping of high-strength concrete obviously becomes a great technical problem. Therefore, it is necessary to develop a super-high layer pumping high-strength concrete made of extra coarse machine-made sand.
Disclosure of Invention
The invention aims to provide extra-coarse machine-made sand super-high-rise pumping high-strength concrete, the strength grade of the concrete reaches C60 and above, the expansion degree is more than or equal to 680mm, the emptying time of a pouring barrel is less than or equal to 5.0s, the pumping performance is excellent, and the problems that concrete produced by extra-coarse machine-made sand is isolated and bleeds, and the super-high-rise pumping of the high-strength concrete cannot be realized are solved.
The technical scheme of the invention is as follows: the ultra-high layer pumping high-strength concrete with extra-coarse machine-made sand is prepared by mixing cement, mineral powder, fly ash, silica fume, extra-coarse machine-made sand, broken stone, water and an additive, wherein each cubic meter of concrete comprises the following components in mass:
400-420 kg of cement, 80-100 kg of mineral powder, 60-80 kg of fly ash, 20-40 kg of silica fume, 1000-1040 kg of extra-coarse machine-made sand, 660-680 kg of broken stone, 155-165 kg of water and 5.6-7.7 kg of an additive;
wherein: the fineness modulus of the extra-coarse machine-made sand is 3.6-4.1, the crushing value is less than or equal to 25.0%, the stone powder content is 5.0% -10.0%, and the MB value is less than 1.4.
In the invention, the cement is P.O42.5 grade cement.
In the invention, the mineral powder is S95 grade mineral powder.
In the invention, the fly ash is II-grade fly ash.
In the invention, the silica fume is one of encrypted silica fume, semi-encrypted silica fume or non-encrypted silica fume, the ignition loss is less than or equal to 5.0 percent, and the mass fraction of silica dioxide is more than or equal to 85 percent.
According to the invention, the crushed stone is 5-20 mm continuous gradation, the crushing value is less than or equal to 10.0%, the needle sheet content is less than or equal to 5.0%, and the mud content is less than or equal to 0.5%.
In the invention, the water is tap water.
In the invention, the additive is a polycarboxylic acid water reducing agent, and the water reducing rate is 28.0-32.0%.
Compared with the prior art, the invention has the beneficial effects that: the fine aggregate is all made of extra-coarse sand, the super high-rise pumping high-strength concrete with excellent performance is prepared, the problem that super high-rise pumping cannot be realized due to segregation and bleeding of pumping concrete produced by singly adopting the extra-coarse sand as the fine aggregate is solved, super high-rise buildings in some areas can be continuously constructed under the condition that no excellent medium sand resource exists, and the pressure that the excellent medium sand resource is continuously in short supply in China at present is effectively relieved.
Detailed Description
In order to make the contents, technical solutions and advantages of the present invention more apparent, the present invention is further illustrated below with reference to specific examples, which are only used for illustrating the present invention, and the present invention is not limited only to the following examples.
The following examples used the following raw materials:
the cement is P.O42.5 cement produced by Hunan conch cement Co., Ltd, and has a density of 3.05g/cm3Strength 49.2MPa in 28 days; the mineral powder is S95 grade mineral powder produced by Hunan Sanhong building materials Co Ltd, the 28-day activity index is 104 percent, and the specific surface area is 430kg/m3(ii) a The fly ash is grade II fly ash produced by Minglonghui environmental protection science and technology development limited company in Yueyang, the fineness is 22 percent, the water demand ratio is 98 percent, and the 28-day activity index is 73 percent; the silica fume is the densified silica fume produced by the excellence-forming tetragonal environmental science and technology Limited company, the ignition loss is 3.7 percent, the silicon dioxide content is 86.3 percent, the activity index is 105 percent, the additive is a polycarboxylic acid water reducing agent produced by the Xika (China) Limited company, and the water reducing rate is 31.2 percent; the water is tap water; the broken stone is 5-20 mm continuous graded limestone broken stone, the crushing value is 8.2%, and the mud content is 0.4%; the fineness modulus of extra-coarse machine-made sand is 3.8, the content of stone powder is 6.2%, the MB value is 1.0, and the crushing value is 22%.
Example 1:
the super-high layer pumping high-strength concrete with extra-coarse machine-made sand comprises the following materials in per cubic meter: 400kg of cement, 80kg of mineral powder, 70kg of fly ash, 30kg of encrypted silica fume, 1020kg of extra-coarse machine-made sand, 670kg of broken stone, 160kg of water and 6.7kg of additive.
The prepared concrete has the following detection performances: the 28d strength is 69.6MPa, the expansion degree is 700mm, the emptying time of the inverted barrel is 3.6s, and the requirement of ultra-high-rise pumping is met.
Example 2:
the super-high layer pumping high-strength concrete with extra-coarse machine-made sand comprises the following materials in per cubic meter: 410kg of cement, 80kg of mineral powder, 70kg of fly ash, 40kg of encrypted silica fume, 1040kg of extra-coarse machine-made sand, 660kg of broken stone, 165kg of water and 7.3kg of additive.
The prepared concrete has the following detection performances: the 28d strength is 75.8MPa, the expansion degree is 725mm, the emptying time of the inverted barrel is 2.4s, and the requirement of ultra-high-rise pumping is met.
Claims (8)
1. The extra-coarse machine-made sand super-high layer pumping high-strength concrete is characterized by being prepared by mixing cement, mineral powder, fly ash, silica fume, extra-coarse machine-made sand, broken stone, water and an additive, wherein each cubic meter of concrete comprises the following components in mass:
400-420 kg of cement, 80-100 kg of mineral powder, 60-80 kg of fly ash, 20-40 kg of silica fume, 1000-1040 kg of extra-coarse machine-made sand, 660-680 kg of broken stone, 155-165 kg of water and 5.6-7.7 kg of an additive;
wherein: the fineness modulus of the extra-coarse machine-made sand is 3.6-4.1, the crushing value is less than or equal to 25.0%, the stone powder content is 5.0% -10.0%, and the MB value is less than 1.4.
2. The extra coarse machine-made sand super high-rise pumped high-strength concrete as claimed in claim 1, wherein the cement is P.O42.5 grade cement.
3. The extra-coarse machine-made sand super high-rise pumped high-strength concrete as claimed in claim 1, wherein the ore powder is S95 grade ore powder.
4. The extra-coarse machine-made sand super-high layer pumping high-strength concrete as claimed in claim 1, wherein the fly ash is class II fly ash.
5. The extra-coarse machine-made sand super-high layer pumping high-strength concrete according to claim 1, wherein the silica fume is one of dense silica fume, semi-dense silica fume or non-dense silica fume, the loss on ignition is less than or equal to 5.0%, and the silica (mass fraction) is more than or equal to 85%.
6. The extra-coarse machine-made sand super-high layer pumping high-strength concrete according to claim 1, wherein the crushed stone is 5-20 mm continuous gradation, the crushing value is less than or equal to 10.0%, the needle sheet content is less than or equal to 5.0%, and the mud content is less than or equal to 0.5%.
7. The extra coarse machine-made sand super high-rise pumped high-strength concrete according to claim 1, wherein the water is tap water.
8. The extra-coarse machine-made sand super-high layer pumping high-strength concrete as claimed in claim 1, wherein the additive is a polycarboxylic acid water reducing agent, and the water reducing rate is 28.0% -32.0%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010099089.7A CN111333383A (en) | 2020-02-18 | 2020-02-18 | Extra-coarse machine-made sand super-high layer pumping high-strength concrete |
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| CN202010099089.7A CN111333383A (en) | 2020-02-18 | 2020-02-18 | Extra-coarse machine-made sand super-high layer pumping high-strength concrete |
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| CN111333383A true CN111333383A (en) | 2020-06-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083138A (en) * | 2020-09-15 | 2020-12-15 | 中建西部建设西南有限公司 | Method for judging that mixing plant waste slurry water can be used for concrete production |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150840A (en) * | 2014-08-19 | 2014-11-19 | 华润水泥技术研发（广西）有限公司 | C60 full-manufactured sand super high-rise pump concrete |
| CN105801053A (en) * | 2016-03-16 | 2016-07-27 | 武汉源锦商品混凝土有限公司 | Large-admixing-amount-fly-ash C40 self-compacting concrete |
| CN106977155A (en) * | 2017-04-13 | 2017-07-25 | 天津金隅混凝土有限公司 | C60 ultra-high pump concretes |
| KR20180020021A (en) * | 2016-08-17 | 2018-02-27 | 서승석 | Mortar composition not containing sand and use thereof |
| CN108147746A (en) * | 2017-12-29 | 2018-06-12 | 中建西部建设贵州有限公司 | A kind of Machine-made Sand C120 super high strength concretes for being easy to super high-rise pumping |
| CN110342886A (en) * | 2019-08-06 | 2019-10-18 | 中国建筑材料科学研究总院有限公司 | A kind of high-strength machine-made sand concrete and preparation method thereof |
-
2020
- 2020-02-18 CN CN202010099089.7A patent/CN111333383A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150840A (en) * | 2014-08-19 | 2014-11-19 | 华润水泥技术研发（广西）有限公司 | C60 full-manufactured sand super high-rise pump concrete |
| CN105801053A (en) * | 2016-03-16 | 2016-07-27 | 武汉源锦商品混凝土有限公司 | Large-admixing-amount-fly-ash C40 self-compacting concrete |
| KR20180020021A (en) * | 2016-08-17 | 2018-02-27 | 서승석 | Mortar composition not containing sand and use thereof |
| CN106977155A (en) * | 2017-04-13 | 2017-07-25 | 天津金隅混凝土有限公司 | C60 ultra-high pump concretes |
| CN108147746A (en) * | 2017-12-29 | 2018-06-12 | 中建西部建设贵州有限公司 | A kind of Machine-made Sand C120 super high strength concretes for being easy to super high-rise pumping |
| CN110342886A (en) * | 2019-08-06 | 2019-10-18 | 中国建筑材料科学研究总院有限公司 | A kind of high-strength machine-made sand concrete and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083138A (en) * | 2020-09-15 | 2020-12-15 | 中建西部建设西南有限公司 | Method for judging that mixing plant waste slurry water can be used for concrete production |
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Application publication date: 20200626 |
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