CN111875313B - Preparation method of super early strength self-compacting concrete applied to PC (polycarbonate) member - Google Patents
Preparation method of super early strength self-compacting concrete applied to PC (polycarbonate) member Download PDFInfo
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- CN111875313B CN111875313B CN202010676257.4A CN202010676257A CN111875313B CN 111875313 B CN111875313 B CN 111875313B CN 202010676257 A CN202010676257 A CN 202010676257A CN 111875313 B CN111875313 B CN 111875313B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a preparation method of super early strength self-compacting concrete applied to PC members, which selects proper raw materials according to the requirements of different PC members: selecting proper powder, sand, aggregate and the like; b, optimizing the particle composition: through early-stage concrete tests, proper concrete aggregate matching is determined, the formula adopts multi-stage aggregate matching and selects proper glue-bone ratio, so that the system is tightly stacked, and the porosity and the shrinkage rate are reduced; c, adopting a nanocrystal core early strength technology: a certain amount of nano early-strength crystal nucleating agent is added into the concrete, so that the strength of the concrete is rapidly developed, and the compressive strength of the concrete is up to more than 15MPa within 8 hours at normal temperature; d, accurately controlling the concrete operation time: the slump-retaining type high-efficiency water reducing agent is adopted to slow down the problem of rapid condensation caused by the super early strength of the concrete, so that the concrete is ensured to have enough operation time; the concrete can be free from vibration or less in the pouring process, the early strength of the concrete is high, and the appearance quality of the concrete is good.
Description
Technical Field
The invention relates to the field of assembly type buildings, in particular to a preparation method of super early strength self-compacting concrete applied to a PC member.
Background
PC components are concrete products produced by standardized, mechanized processes in factories. With the strong advocated and promoted assembly type buildings in China, the concrete prefabricated member is widely applied to the fields of buildings, traffic, water conservancy and the like at present and plays an important role in national economy. The production of PC components is generally divided into the following steps: assembling a mould; installing a steel bar framework; pouring concrete; removing the form of the component and hoisting; repairing the surface of the component; and warehousing and maintaining the components for shipment. The disadvantages of the prior art are as follows: the first is that the fluidity and the workability of the common concrete are poor, and particularly under the condition of a steel bar structure, the compactness of the concrete can be ensured by a large amount of mechanical or even manual vibration; secondly, the common concrete cannot realize super early strength because of slow development of early strength, so that the mould stripping time is long, the required time is usually more than 24 hours under the condition that the component is required to reach the allowable stripping strength (15 MPa) of about 15 hours, and the air temperature is low in winter. If the steam curing mode is adopted, the investment is needed to increase steam curing equipment, but when the temperature is higher, the steam curing equipment is idle, so that the waste is greatly caused, and meanwhile, certain potential safety hazards also exist in the steam curing equipment; thirdly, even though the common concrete is vibrated mechanically and manually, the vibration is not uniform, and a large amount of bubbles are not removed, so that depressions and holes are easily caused on the surface of the concrete in the later period, and the subsequent manual repair places are large, so that the storage time of the component is further prolonged.
Disclosure of Invention
The invention aims to overcome the defects that the prior ordinary concrete has poor fluidity and workability, slow development of early strength, incapability of realizing super early strength and time and labor waste caused by the fact that a large amount of bubbles are not removed, and provides a preparation method of super early strength self-compacting concrete applied to PC members.
The purpose of the invention is realized by the following technical scheme: a preparation method of super early strength self-compacting concrete applied to PC components is disclosed, wherein according to the requirements of different PC components, a, proper raw materials are selected: selecting proper powder, sand, aggregate and the like; b, optimizing the particle composition: through early-stage concrete tests, proper concrete aggregate matching is determined, the formula adopts multi-stage aggregate matching and selects proper glue-bone ratio, so that the system is tightly stacked, and the porosity and the shrinkage rate are reduced; c, adopting a nano crystal nucleus early strength technology: a certain amount of nano early-strength crystal nucleating agent is added into the concrete, so that the strength of the concrete is rapidly developed, and the compressive strength of the concrete is up to more than 15MPa within 8 hours at normal temperature; d, accurately controlling the concrete operation time: the slump-retaining type high-efficiency water reducing agent is adopted to slow down the problem of rapid condensation caused by super early strength of concrete, so that the concrete is ensured to have enough operation time.
The preparation method comprises the following steps:
s1: weighing 500 parts by weight of PII42.5 or PII52.5 cement 250-containing material, 0-200 parts by weight of first-level fly ash, 0-50 parts by weight of silica fume, 900 parts by weight of 5-10mm impact broken stone, 0-300 parts by weight of 10-16mm impact broken stone, 870 parts by weight of river sand, 190 parts by weight of water 160-containing material, 1.2-2.0 percent of slump loss prevention type water reducing agent and 0.5-1.5 percent of nano early strength nucleating agent;
s2: pouring the glue material and the sandstone aggregate into a stirrer in sequence, slowly stirring for 1min, then adding the weighed nano early-strength nucleating agent into the weighed water for fully mixing, then slowly pouring into the stirring stirrer, stirring for 30s, adding the weighed slump-retaining water reducing agent, continuously stirring for 2min, and then controlling the stirrer to discharge the concrete out of the machine;
s3: detecting the strength of the concrete, and respectively testing the filling property, the clearance passing property and the segregation resistance of the concrete after the concrete is taken out of the machine; immediately placing the concrete test block after the retention forming into a standard curing room for curing, taking out the test block from the standard curing room when the concrete test block reaches the specified age, removing a mold, and testing the compression strength of the test block;
the standard curing condition in the step S3 is to perform curing under the conditions of constant temperature and constant humidity, the curing temperature is 18-22 ℃, the relative humidity is more than 95% RH, and the curing time is 28 days.
The invention has the following advantages:
1. the concrete has good fluidity and workability, and can realize self-compaction under the condition of vibration-free or manual slight auxiliary vibration, thereby effectively improving the production efficiency.
2. The concrete can realize super early strength, and the PC member can be demolded within 8h at normal temperature, thereby greatly improving the turnover rate of the die and being beneficial to reducing the production cost.
3. The poured concrete has good appearance quality, few surface bubbles, no chromatic aberration and high flatness, can basically realize the surface of the member without secondary repair, and slows down the inventory time of the PC member.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 shows the test results of example 1 of the present invention;
FIG. 3 shows the test results of example 2 of the present invention;
FIG. 4 shows the test results of example 3 of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
The purpose of the invention is realized by the following technical scheme: the super early strength self-compacting concrete for the PC member comprises the following raw materials, by weight, 250-750 parts of a cementing material, 4.25-26.25 parts of a composite additive, 190 parts of water and 1300-2070 parts of an aggregate, based on 1 square concrete.
The composite additive is composed of a slump retaining water reducer and a nano early strength nucleating agent; based on the total amount of the cementing material, the mixing amount of the slump-retaining water reducer is 1.2-2.0%, and the mixing amount of the nano early-strength crystal nucleus agent is 0.5-1.5%.
The cementing material consists of 500 parts by weight of common cement, 0-200 parts by weight of fly ash and 0-50 parts by weight of silica fume, wherein the mixing amount of the common cement is 250-200 parts by weight.
The aggregate comprises sand and stones, the mixing amount of the sand is 800-870 parts by weight, and the mixing amount of the stones is 500-1200 parts by weight; the sand is river sand with fineness modulus of 2.6-2.8, the stones are impact broken stones with particle size of 5-10mm and 10-16mm, the mixing amount of the impact broken stones with particle size of 5-10mm is 500-900 parts by weight, and the mixing amount of the impact broken stones with particle size of 10-16mm is 0-300 parts by weight.
The preparation method of the super early-strength self-compacting concrete applied to the PC member comprises the following steps:
s1: weighing 500 parts by weight of PII42.5 or PII52.5 cement 250-containing material, 0-200 parts by weight of first-level fly ash, 0-50 parts by weight of silica fume, 900 parts by weight of 5-10mm impact broken stone, 0-300 parts by weight of 10-16mm impact broken stone, 870 parts by weight of river sand, 190 parts by weight of water 160-containing material, 1.2-2.0 percent of slump loss prevention type water reducing agent and 0.5-1.5 percent of nano early strength nucleating agent;
s2: pouring the glue material and the sandstone aggregate into a stirrer in sequence, slowly stirring for 1min, then adding the weighed nano early-strength nucleating agent into the weighed water for fully mixing, then slowly pouring into the stirring stirrer, stirring for 30s, adding the weighed slump-retaining water reducing agent, continuously stirring for 2min, and then controlling the stirrer to discharge the concrete out of the machine;
s3: detecting the strength of the concrete, and respectively testing the filling property, the clearance passing property and the segregation resistance of the concrete after the concrete is taken out of the machine; and (4) immediately putting the concrete test block after the retention forming into a standard curing room for curing, taking out the test block from the standard curing room when the concrete test block reaches the specified age, removing the mold, and testing the compressive strength of the test block.
The nanometer early-strength crystal nucleus agent is mixed with water firstly, and the water amount introduced by the nanometer early-strength crystal nucleus agent needs to be deducted.
The slump-retaining water reducing agent is a red wall P4 slump-retaining high-efficiency water reducing agent, the nano early-strength nucleating agent is BASF Xseed nano nucleating agent, the common cement is any one of PII42.5R grade or PII 52.5R, the fly ash is first-grade fly ash, the fly ash is first-grade silica fume, and the sand is river sand with fineness modulus of 2.6-2.8.
The preparation method needs to set a blank control group, the blank control group is prepared according to the same material proportion, a nanocrystal core early strength agent is not added, a common non-slump-retaining type high efficiency water reducing agent is used, the test steps are repeated, and the test result is used as the blank control.
The standard curing condition in the step S3 is to perform curing under the conditions of constant temperature and constant humidity, the curing temperature is 18-22 ℃, the relative humidity is more than 95% RH, and the curing time is 28 days; the test standards of filling property, clearance passing property and segregation resistance are in accordance with the requirements of JGJ T283 and 2012 'technical specification for self-compacting concrete application'.
The technical solution of the present invention is further described below with reference to the embodiments.
Example 1:
s11: weighing PII42.5R cement 280kg, first-level fly ash 200kg, river sand 820kg, 5-10mm impact broken stones 830kg and water consumption 195kg, wherein the added water needs to deduct the water brought by the nano early strength crystal nucleus agent, the nano early strength crystal nucleus agent is doped with 1% of the total amount of the cementing material, and the slump-retaining water reducing agent is doped with 1.5% of the total amount of the cementing material;
s21: pouring the glue material and the sandstone aggregate into a stirrer in sequence, slowly stirring for 1min, then adding the weighed nano early-strength nucleating agent into the weighed tap water for fully mixing, then pouring into the stirring stirrer, stirring for 30s, then adding the weighed slump-retaining water reducing agent, continuing stirring for 2min, and then controlling the stirrer to discharge the concrete out of the machine;
s31: the concrete after leaving the machine is respectively tested for filling property, clearance passing property and segregation resistance according to the requirements of JGJ T283 and 2012 'technical specification for self-compacting concrete application'; in addition, the concrete molding test block is left and cured immediately under standard curing conditions to measure the compressive strength of the concrete in different time periods.
According to the same material proportion, a nano crystal nucleus early strength agent is not added, a common non-slump-retaining type high-efficiency water reducing agent is used, the test steps are repeated, and the test result is used as a blank control.
As shown in FIG. 2, the compressive strength is 8.7MPa at 8h, and compared with the blank control group, the mechanical properties at different time periods are better, and the compressive capacity is improved.
Example 2:
s11: weighing PII42.5R kg of cement, 100kg of first-stage fly ash, 30kg of silica fume, 830kg of river sand, 588kg of impact broken stones with the size of 5-10mm, 252kg of impact broken stones with the size of 10-16mm, 180kg of tap water, 1.6 percent of slump-retaining water reducer, 1 percent of nano early strength crystal nucleus agent and 0.375 percent of water-cement ratio, wherein the water amount added needs to be deducted from the water amount brought by the nano early strength crystal nucleus agent;
s21: pouring the glue material and the sandstone aggregate into a stirrer in sequence, slowly stirring for 1min, then adding the weighed nano early-strength nucleating agent into the weighed tap water for fully mixing, then pouring into the stirring stirrer, stirring for 30s, then adding the weighed slump-retaining water reducing agent, continuing stirring for 2min, and then controlling the stirrer to discharge the concrete out of the machine;
s31: the concrete after leaving the machine is respectively tested for filling property, clearance passing property and segregation resistance according to the requirements of JGJ T283 and 2012 'technical specification for self-compacting concrete application'; in addition, the concrete molding test block was left to cure immediately under standard curing conditions to determine the compressive strength of the concrete over different time periods.
According to the same material proportion, a nano crystal nucleus early strength agent is not added, a common non-slump-retaining type high-efficiency water reducing agent is used, the test steps are repeated, and the test result is used as a blank control.
As shown in figure 3, the compressive strength reaches 23.2MPa and is more than 15MPa after 8h, the compressive capacity is obviously improved compared with that of a blank control group in the early mechanical property, and the super early strength can be realized.
Example 3:
s11: PII42.5R kg of cement, 100kg of first-level fly ash, 50kg of silica fume, 800kg of river sand, 570kg of impact crushing stones with the size of 5-10mm, 270kg of impact crushing stones with the size of 10-16mm, 165kg of tap water and 1.9 percent of slump-retaining water reducing agent are mixed according to the total amount of a glue material, 1 percent of nano early strength crystal nucleating agent is mixed according to the total amount of the glue material, and 165kg of water consumption is obtained, wherein the water consumption needs to be deducted from the water amount brought by the nano early strength crystal nucleating agent.
S21: pouring the glue material and the sandstone aggregate into a stirrer successively, slowly stirring for 1min, then adding the weighed nano early-strength crystal nucleating agent into the weighed tap water for fully mixing, then pouring into the stirring stirrer in stirring, stirring for 30s, then adding the weighed slump-retaining water reducing agent, continuing stirring for 2min, and then controlling the stirrer to discharge the concrete;
s31: the concrete after leaving the machine is respectively tested for filling property, clearance passing property and segregation resistance according to the requirements of JGJ T283 and 2012 'technical specification for self-compacting concrete application'; in addition, the concrete molding test block was left to cure immediately under standard curing conditions to determine the compressive strength of the concrete over different time periods.
According to the same material proportion, a nano crystal nucleus early strength agent is not added, a common non-slump-retaining type high-efficiency water reducing agent is used, the test steps are repeated, and the test result is used as a blank control. According to the same material proportion, a nano crystal nucleus early strength agent is not added, and a common non-collapse type high-efficiency water reducing agent is used, the steps are repeated, and the result is used as a blank control.
As shown in figure 4, the compressive strength reaches 29.1MPa and is more than 15MPa after 8h, the compressive capacity is obviously improved compared with that of a blank control group in the early mechanical property, and the super early strength can be realized.
Claims (5)
1. The utility model provides a be applied to super early strong self-compaction concrete of PC component which characterized in that: calculated by 1 square concrete, the concrete comprises the following raw materials, by weight, 530 parts of cementing material, 15.37 parts of composite additive, 165 parts of water and 1640 parts of aggregate;
the composite additive is composed of a slump retaining water reducer and a nano early strength nucleating agent; based on the total amount of the cementing material, the mixing amount of the slump-retaining water reducer is 1.9 percent, and the mixing amount of the nano early-strength crystal nucleus agent is 1 percent;
the cementing material consists of 380 parts by weight of common cement, 100 parts by weight of fly ash and 50 parts by weight of silica fume;
the aggregate consists of 800 parts by weight of sand and 840 parts by weight of stone; the sand is river sand with fineness modulus of 2.6-2.8, the stones are impact crushing stones with particle size of 5-10mm and 10-16mm, the dosage of the impact crushing stones with particle size of 5-10mm is 570 parts by weight, and the dosage of the impact crushing stones with particle size of 10-16mm is 270 parts by weight;
the slump-retaining water reducing agent is a red wall P4 slump-retaining high-efficiency water reducing agent, the nano early-strength crystal nucleating agent is a BASF Xseed nano crystal nucleating agent, the common cement is PII42.5R grade, the fly ash is first-grade fly ash, the silica fume is first-grade silica fume, and the sand is river sand with fineness modulus of 2.6-2.8.
2. The method for preparing the ultra-early-strength self-compacting concrete for the PC component according to claim 1, which comprises the following steps:
s1: weighing 380 parts of PII42.5 cement, 100 parts of first-stage fly ash, 50 parts of silica fume, 570 parts of 5-10mm impact breaking stones, 270 parts of 10-16mm impact breaking stones, 800 parts of river sand, 165 parts of water, 1.9% of slump loss resistant water reducing agent and 1% of nano early strength nucleating agent;
s2: pouring the glue material and the sandstone aggregate into a stirrer in sequence, slowly stirring for 1min, then adding the weighed nano early-strength nucleating agent into the weighed water for fully mixing, then slowly pouring into the stirring stirrer, stirring for 30s, adding the weighed slump-retaining water reducing agent, continuously stirring for 2min, and then controlling the stirrer to discharge the concrete out of the machine;
s3: detecting the strength of the concrete, and respectively testing the filling property, the clearance passing property and the segregation resistance of the concrete after the concrete is taken out of the machine; and (4) immediately putting the concrete test block after the retention forming into a standard curing room for curing, taking out the test block from the standard curing room when the concrete test block reaches the specified age, removing the mold, and testing the compressive strength of the test block.
3. The method for preparing the ultra-early-strength self-compacting concrete applied to the PC component as claimed in claim 2, wherein the method comprises the following steps: the standard curing condition in the step S3 is to perform curing under the conditions of constant temperature and constant humidity, the curing temperature is 18-22 ℃, the relative humidity is more than 95% RH, and the curing time is 28 days.
4. The method for preparing the ultra-early-strength self-compacting concrete applied to the PC component as claimed in claim 2, wherein the method comprises the following steps: the nanometer early-strength crystal nucleus agent is mixed with water firstly, and the water amount introduced by the nanometer early-strength crystal nucleus agent needs to be deducted.
5. The method for preparing the ultra-early-strength self-compacting concrete applied to the PC component as claimed in claim 2, wherein the method comprises the following steps: the preparation method needs to set a blank control group, the blank control group is prepared according to the same material proportion, a nanocrystal core early strength agent is not added, a common non-slump-retaining type high efficiency water reducing agent is used, the test steps are repeated, and the test result is used as the blank control.
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| CN112645660A (en) * | 2020-12-31 | 2021-04-13 | 上海三瑞高分子材料股份有限公司 | High early strength concrete for assembled PC member |
| CN113511862A (en) * | 2021-06-23 | 2021-10-19 | 嘉兴学院 | Non-autoclaved concrete and preparation method thereof |
| CN114890809A (en) * | 2022-06-17 | 2022-08-12 | 华润水泥技术研发有限公司 | Steel slag-based high-carbon-fixation-quantity non-autoclaved aerated concrete and preparation method thereof |
| CN115650666B (en) * | 2022-10-26 | 2023-12-05 | 嘉华特种水泥股份有限公司 | Assembled PC component concrete and preparation and maintenance method thereof |
| CN117645453A (en) * | 2023-12-06 | 2024-03-05 | 青岛理工大学 | Steaming-free super-early-strength C120 self-compacting concrete and preparation method thereof |
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