CN112645660A - High early strength concrete for assembled PC member - Google Patents
High early strength concrete for assembled PC member Download PDFInfo
- Publication number
- CN112645660A CN112645660A CN202011636991.4A CN202011636991A CN112645660A CN 112645660 A CN112645660 A CN 112645660A CN 202011636991 A CN202011636991 A CN 202011636991A CN 112645660 A CN112645660 A CN 112645660A
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- Prior art keywords
- early strength
- cement
- fly ash
- concrete
- 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
-
- 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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- 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 high early strength concrete for an assembled PC member, which consists of the following raw materials in parts by weight: 400 parts of cement 350-80 parts of fly ash, 630 parts of sand 550-80 parts of sand, 1200 parts of gravel 1100-1200 parts of water reducing agent accounting for 1.0-2.0% of the mass sum of the cement and the fly ash, early strength agent accounting for 1.0-10.0% of the mass sum of the cement and the fly ash and mixing water accounting for 30-35% of the mass sum of the cement and the fly ash. Weighing cement, fly ash, sand and stones with certain mass, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly; weighing a certain mass of water reducing agent, an early strength agent and mixing water, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 1.5-3min, and discharging to obtain the high early strength concrete for the assembled PC component. The concrete has a compressive strength of 18MPa in 12 hours and meets the requirements of demoulding.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to high early strength concrete for an assembled PC member.
Background
PC components are an important component of prefabricated buildings. Compared with the traditional cast-in-place concrete construction mode, the prefabricated PC member has remarkable advantages in the aspects of energy conservation, environmental protection, cost control, quality control and the like, and gradually becomes the main trend of building industrialization.
PC components are generally prepared by premixing concrete in a factory and casting it into a mold, followed by appropriate curing. A key problem in the production process of the PC component is production efficiency and maintenance energy consumption, and the core is the development speed of concrete strength. The early strength of the hardened concrete develops quickly, so that the demolding time can be shortened, the turnover efficiency of the mold is accelerated, and the energy consumption of maintenance is reduced. Therefore, designing and developing concrete with high early strength properties is critical to improving the manufacturing technology of fabricated PC components.
Disclosure of Invention
The invention aims to solve the problem that the hardening early strength of the existing PC member is slowly developed, and provides high early strength concrete.
In order to achieve the purpose, the specific technical scheme of the invention is as follows:
a high early strength concrete for fabricated PC components is characterized in that: the composite material consists of the following raw materials in parts by weight:
the cement is P.O 42.5 ordinary Portland cement;
the fly ash is II-grade ash;
the sand is river sand or machine-made sand, and the fineness modulus is 2.5-2.9;
the particle size of the stones is 5-25 mm;
the dispersing agent is an early-strength polycarboxylate superplasticizer;
the early strength agent is nano-micro scale calcium silicate hydrate sol suspension, the particle size of the sol is 180-245nm, and the solid content is 15-23%.
The high early strength concrete for the assembled PC component is prepared by the following steps:
(1) weighing cement, fly ash, sand and stones with certain mass, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly;
(2) weighing a certain mass of water reducing agent, an early strength agent and mixing water, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 1.5-3min, and discharging to obtain the high early strength concrete for the assembled PC component.
According to the high early strength concrete for the assembled PC member, provided by the invention, the nano-micro scale calcium silicate hydrate is introduced as an early strength agent, so that the C-S-H gel nucleation barrier formed by cement hydration can be greatly reduced, the cement hydration reaction rate is promoted, and the early strength of the hardened concrete is further improved.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention. Various equivalent modifications of the invention, which fall within the scope of the appended claims of this application, will occur to persons skilled in the art.
Comparative example
A high early strength concrete for fabricated PC components consisting of the following raw materials in parts by weight (1 part ═ 1 kg):
weighing cement, fly ash, sand and stones according to the formula, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly; weighing the water reducing agent and the mixing water according to the formula, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 1.5min, discharging, testing fluidity, molding, and placing into a standard curing chamber with the temperature of 22 +/-3 ℃ and the humidity of more than 95 RH% for curing. And removing the mold after reaching the preset age, and testing the strength.
Example 1
A high early strength concrete for fabricated PC components consisting of the following raw materials in parts by weight (1 part ═ 1 kg):
weighing cement, fly ash, sand and stones according to the formula, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly; weighing the water reducing agent and the mixing water according to the formula, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 2.0min, discharging, molding, and placing into a standard curing chamber with the temperature of 22 +/-3 ℃ and the humidity of more than 95 RH% for curing. And removing the mold after reaching the preset age, and testing the strength.
Example 2
A high early strength concrete for fabricated PC components consisting of the following raw materials in parts by weight (1 part ═ 1 kg):
weighing cement, fly ash, sand and stones according to the formula, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly; weighing the water reducing agent and the mixing water according to the formula, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 2.0min, discharging, molding, and placing into a standard curing chamber with the temperature of 22 +/-3 ℃ and the humidity of more than 95 RH% for curing. And removing the mold after reaching the preset age, and testing the strength.
Example 3
A high early strength concrete for fabricated PC components consisting of the following raw materials in parts by weight (1 part ═ 1 kg):
weighing cement, fly ash, sand and stones according to the formula, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly; weighing the water reducing agent and the mixing water according to the formula, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 2.0min, discharging, molding, and placing into a standard curing chamber with the temperature of 22 +/-3 ℃ and the humidity of more than 95 RH% for curing. And removing the mold after reaching the preset age, and testing the strength.
Example 4
A high early strength concrete for fabricated PC components consisting of the following raw materials in parts by weight (1 part ═ 1 kg):
weighing cement, fly ash, sand and stones according to the formula, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly; weighing the water reducing agent and the mixing water according to the formula, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 2.0min, discharging, molding, and placing into a standard curing chamber with the temperature of 22 +/-3 ℃ and the humidity of more than 95 RH% for curing. And removing the mold after reaching the preset age, and testing the strength.
Example 5
A high early strength concrete for fabricated PC components consisting of the following raw materials in parts by weight (1 part ═ 1 kg):
weighing cement, fly ash, sand and stones according to the formula, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly; weighing the water reducing agent and the mixing water according to the formula, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 2.0min, discharging, molding, and placing into a standard curing chamber with the temperature of 22 +/-3 ℃ and the humidity of more than 95 RH% for curing. And removing the mold after reaching the preset age, and testing the strength.
Effects of the implementation
The concrete strength test results in the above examples are as follows:
| compressive strength/MPa for 12 hours | |
| Comparative example | 5.1 |
| Example 1 | 8.9 |
| Example 2 | 12.0 |
| Example 3 | 14.4 |
| Example 4 | 15.2 |
| Example 5 | 18.3 |
From the concrete strength test results, compared with the comparative example without the early strength agent, the concrete compressive strength after 12 hours is obviously improved after the early strength agent is added, the concrete compressive strength after 12 hours of the example 5 with the 5.0 percent early strength agent is up to 18MPa, the demolding requirement is met, and the excellent high early strength performance is embodied.
Claims (4)
1. The high early strength concrete for the assembled PC member is characterized by comprising the following raw materials in parts by weight:
cement 350-
50-80 parts of fly ash
Sand 550 and 630 portions
1100 portions of stone
1.0 to 2.0 percent of the total mass of the water reducing agent, the cement and the fly ash
1.0-10.0 percent of the sum of the mass of the early strength agent cement and the mass of the fly ash
30-35% of the total mass of the mixing water cement and the fly ash; wherein:
the cement is P.O 42.5 ordinary Portland cement;
the sand is river sand or machine-made sand, and the fineness modulus is 2.5-2.9;
the early strength agent is a nano-micro scale calcium silicate hydrate sol suspension, the particle size of the sol is 180-245nm, and the solid content is 15-23%;
the dispersing agent is an early-strength polycarboxylate superplasticizer.
2. The high early strength concrete for fabricated PC components of claim 1 in which the fly ash is a class II ash.
3. The high early strength concrete for fabricated PC components of claim 1, wherein the pebble size is 5-25 mm.
4. The high early strength concrete for fabricated PC components of claim 1, prepared by the steps of:
(1) weighing cement, fly ash, sand and stones, adding into a horizontal concrete mixer, and stirring for 1min to mix uniformly;
(2) weighing the water reducing agent, the early strength agent and the mixing water, mixing, fully stirring, then adding the mixed solution into a concrete mixer, fully stirring for 1.5-3min, and discharging to obtain the high early strength concrete for the assembled PC component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011636991.4A CN112645660A (en) | 2020-12-31 | 2020-12-31 | High early strength concrete for assembled PC member |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011636991.4A CN112645660A (en) | 2020-12-31 | 2020-12-31 | High early strength concrete for assembled PC member |
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| Publication Number | Publication Date |
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| CN112645660A true CN112645660A (en) | 2021-04-13 |
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| CN202011636991.4A Pending CN112645660A (en) | 2020-12-31 | 2020-12-31 | High early strength concrete for assembled PC member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113511862A (en) * | 2021-06-23 | 2021-10-19 | 嘉兴学院 | Non-autoclaved concrete and preparation method thereof |
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| JP2012051741A (en) * | 2010-08-31 | 2012-03-15 | Taiheiyo Materials Corp | Pc grout composition |
| CN105776915A (en) * | 2016-03-23 | 2016-07-20 | 华南理工大学 | Non-cement-based quick-setting and early-strength concrete as well as preparation method and application thereof |
| CN107311591A (en) * | 2017-08-01 | 2017-11-03 | 合肥欧仕嘉机电设备有限公司 | A kind of new grouting material and preparation method thereof |
| CN110698120A (en) * | 2019-10-30 | 2020-01-17 | 广东红墙新材料股份有限公司 | Precast concrete and curing method thereof |
| CN111848053A (en) * | 2020-08-05 | 2020-10-30 | 湖北工业大学 | Fly ash-based nano-micron crystal nucleus additive suitable for concrete prefabricated part and preparation method and application thereof |
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2020
- 2020-12-31 CN CN202011636991.4A patent/CN112645660A/en active Pending
Patent Citations (7)
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| US20110291053A1 (en) * | 2008-07-31 | 2011-12-01 | Nippon Shokubai Co., Ltd. | Shrinkage-reducing agent for hydraulic material and shrinkage-reducing agent composition for hydraulic material |
| JP2012051741A (en) * | 2010-08-31 | 2012-03-15 | Taiheiyo Materials Corp | Pc grout composition |
| CN105776915A (en) * | 2016-03-23 | 2016-07-20 | 华南理工大学 | Non-cement-based quick-setting and early-strength concrete as well as preparation method and application thereof |
| CN107311591A (en) * | 2017-08-01 | 2017-11-03 | 合肥欧仕嘉机电设备有限公司 | A kind of new grouting material and preparation method thereof |
| CN110698120A (en) * | 2019-10-30 | 2020-01-17 | 广东红墙新材料股份有限公司 | Precast concrete and curing method thereof |
| CN111875313A (en) * | 2020-07-14 | 2020-11-03 | 华润水泥技术研发有限公司 | Preparation method of super early-strength self-compacting concrete applied to PC (polycarbonate) member |
| CN111848053A (en) * | 2020-08-05 | 2020-10-30 | 湖北工业大学 | Fly ash-based nano-micron crystal nucleus additive suitable for concrete prefabricated part and preparation method and application thereof |
Non-Patent Citations (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113511862A (en) * | 2021-06-23 | 2021-10-19 | 嘉兴学院 | Non-autoclaved concrete and preparation method thereof |
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Application publication date: 20210413 |