CN113526921A - Self-compacting high-ductility concrete and preparation method thereof - Google Patents

Self-compacting high-ductility concrete and preparation method thereof Download PDF

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Publication number
CN113526921A
CN113526921A CN202010285854.4A CN202010285854A CN113526921A CN 113526921 A CN113526921 A CN 113526921A CN 202010285854 A CN202010285854 A CN 202010285854A CN 113526921 A CN113526921 A CN 113526921A
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China
Prior art keywords
self
ductility concrete
mass
compacting
compacting high
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Inventor
武猛
韩甲兴
杨阳
徐�明
陆潘军
裴清泉
冯诗棋
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Shanghai Xingxin Technology Development Co ltd
China MCC20 Group Corp Ltd
Shanghai Ershiye Construction Co Ltd
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Shanghai Xingxin Technology Development Co ltd
China MCC20 Group Corp Ltd
Shanghai Ershiye Construction Co Ltd
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Priority to CN202010285854.4A priority Critical patent/CN113526921A/en
Publication of CN113526921A publication Critical patent/CN113526921A/en
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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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203—Arrangements for filling cracks or cavities in building constructions
    • E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
    • 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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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to self-compacting high-ductility concrete and a preparation method thereof; the self-compacting high-ductility concrete comprises cement, fly ash, mineral powder, 0.5-2mm steel slag aggregate, 3-5mm steel slag aggregate, polypropylene fiber, a water reducing agent, biogum, a defoaming agent, an expanding agent and water. The self-compacting high-ductility concrete provided by the invention has the advantages that the fluidity and the strength are greatly higher than those of common concrete, the self-compacting high-ductility concrete has high fluidity, high strength, high toughness and high crack resistance, and can be widely applied to supporting and erecting formworks, grouting reinforcement and the like at parts needing reinforcement, such as house beam plate columns, bridges, tunnels and the like. In addition, the self-compacting concrete can also utilize industrial solid wastes such as steel slag, fly ash and slag in a large quantity, meets the requirement of resource regeneration and recycling, reduces the production cost, has environmental protection advantages and has higher social benefit and economic benefit.

Description

Self-compacting high-ductility concrete and preparation method thereof
Technical Field
The invention relates to the field of grouting reinforcement of self-compacting concrete of buildings, in particular to a casting concrete material which is reinforced by modified polypropylene fibers and steel slag particles and has high fluidity, ultrahigh ductility and high strength and a preparation method thereof.
Background
The self-compacting high-ductility concrete is the concrete which can flow and compact under the action of self gravity, can completely fill a template in a compact reinforcing steel bar to obtain good homogeneity, does not need additional vibration, and has high strength, high toughness and high crack resistance. The self-compacting high-ductility concrete can ensure that the poured concrete has good compactness and does not have surface bubbles or honeycomb pitted surface. And the structure with complex shape, thin wall and dense reinforcing bars can be cast without vibrating, and simultaneously, the labor intensity and the labor cost are reduced. The method is widely applied to the parts needing to be reinforced such as beam and plate columns of houses, bridges and tunnels for processing, supporting and erecting templates and grouting reinforcement.
The self-compacting high-ductility concrete is based on the principle that high-toughness polypropylene fibers are added, so that the concrete has higher toughness, and the anti-damage capability of the concrete is improved. The treated steel slag is added as aggregate, so that the strength of the material can be improved. In the mixing proportion of the high-ductility concrete, the hydration heat of the cement is reduced by adding the mineral powder, the fly ash powder and other industrial waste residues, and the influence of cracking, damage and the like of the concrete caused by overlarge internal and external temperature difference generated by the hydration heat of the cement in the preparation and maintenance process of the concrete is prevented. Since fly ash has a microbead effect, the fluidity of the material can be improved by adding fly ash. In addition, the self-compacting high-ductility concrete can also greatly utilize industrial solid wastes to meet the requirement of resource regeneration recycling, so that the production cost is reduced, the environment-friendly advantage is achieved, and the social benefit and the economic benefit are higher.
Disclosure of Invention
The invention aims to provide self-compacting high-ductility concrete and a preparation method thereof, and the concrete is realized by concrete mixing ratio design, fiber reinforcement, cement grade improvement, steel slag aggregate increase, cement hydration heat reduction, concrete pore reduction, concrete fluidity improvement and other methods.
In order to achieve the above object, the present invention is realized by:
the self-compacting high-ductility concrete comprises 30-35 parts by mass of cement, 15-20 parts by mass of fly ash, 15-20 parts by mass of mineral powder, 5-10 parts by mass of 0.5-2mm steel slag aggregate, 20-25 parts by mass of 3-5mm steel slag aggregate, polypropylene fibers with the material dosage of 0.8-1.2%, a water reducing agent with the material dosage of 0.10-0.25%, biological glue with the material dosage of 0.001-0.005%, a defoaming agent with the material dosage of 0.03%, an expanding agent with the material dosage of 0.03% and water with the material dosage of 0.25-0.35 times.
The cement of the self-compacting high-ductility concrete is P.O52.5 ordinary portland cement.
The self-compacting high-ductility concrete is characterized in that the fly ash is I-grade ash.
The mineral powder of the self-compacting high-ductility concrete is S95 type slag powder.
The self-compacting high-ductility concrete has the steel slag aggregate with the grain size of 0.5-2mm and 3-5 mm.
The polypropylene fiber of the self-compacting high-ductility concrete is modified polypropylene fiber, the model MA20, the tensile strength is more than 600MPa, and the elastic modulus is 5-7 GPa.
The water reducing agent of the self-compacting high-ductility concrete is a polycarboxylic acid high-efficiency water reducing agent.
The self-compacting high-ductility concrete is characterized in that the type of the biological glue is VX 80.
The self-compacting high-ductility concrete is prepared from the following components.
The self-compacting high-ductility concrete has the advantages that the expanding agent is a plastic expanding agent.
The preparation method of the self-compacting high-ductility concrete comprises the following steps
Step 1, respectively metering cement, slag powder, fly ash, steel slag aggregate, a water reducing agent, biological glue, a defoaming agent and an expanding agent;
step 2, placing the ingredients in the step 1 into a stirrer, and stirring to obtain dry powder materials, wherein the stirring time is not less than 2 minutes;
step 3, adding the polypropylene fibers into the dry powder material obtained in the step 2 in batches according to a set mixing proportion, and uniformly stirring for not less than 2 minutes;
and 4, adding water into the material obtained in the step 3 twice and uniformly stirring, wherein two thirds of the water is added for the first time, and the rest water is added for the second time. The stirring time is not less than 6 minutes, and the high-ductility concrete mixture is obtained.
The application method of the self-compacting high-ductility concrete comprises the steps of firstly processing the parts, needing to be reinforced, of the house beam plate column, the bridge or the bridge to support and build the template, reserving the grouting holes, and then completing pouring of the obtained high-ductility concrete mixture within 60 minutes.
Advantageous effects
By adding the high-toughness polypropylene fibers, the concrete has higher toughness, and the anti-damage capability of the concrete is improved. The treated steel slag is added as aggregate, so that the strength of the material can be improved. In the mixing proportion of the high-ductility concrete, the hydration heat of the cement is reduced by adding the mineral powder, the fly ash powder and other industrial waste residues, and the influence of cracking, damage and the like of the concrete caused by overlarge internal and external temperature difference generated by the hydration heat of the cement in the preparation and maintenance process of the concrete is prevented. Since fly ash has a microbead effect, the fluidity of the material can be improved by adding fly ash. In addition, the self-compacting high-ductility concrete can also greatly utilize industrial solid wastes to meet the requirement of resource regeneration recycling, so that the production cost is reduced, the environment-friendly advantage is achieved, and the social benefit and the economic benefit are higher.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1:
the self-compacting high-ductility concrete comprises 30 parts by mass of cement, 15 parts by mass of fly ash, 20 parts by mass of mineral powder, 10 parts by mass of 0.5-2mm steel slag aggregate, 25 parts by mass of 3-5mm steel slag aggregate, 1.0% of polypropylene fiber by mass, 0.20% of water reducing agent by mass, 0.003% of biogel by mass, 0.03% of defoaming agent by mass, 0.03% of expanding agent by mass and 0.3 times of water by mass.
Step 1, respectively metering cement, slag powder, fly ash, steel slag aggregate, a water reducing agent, biological glue, a defoaming agent and an expanding agent;
step 2, placing the ingredients in the step 1 into a stirrer, and stirring to obtain dry powder materials, wherein the stirring time is not less than 2 minutes;
step 3, adding the polypropylene fibers into the dry powder material obtained in the step 2 in batches according to a set mixing proportion, and uniformly stirring for not less than 2 minutes;
and 4, adding water into the material obtained in the step 3 twice and uniformly stirring, wherein two thirds of the water is added for the first time, and the rest water is added for the second time. The stirring time is not less than 6 minutes, and the high-ductility concrete mixture is obtained.
The application method of the self-compacting high-ductility concrete comprises the steps of firstly processing the parts, needing to be reinforced, of the house beam plate column, the bridge or the bridge to support and build the template, reserving the grouting holes, and then completing pouring of the obtained high-ductility concrete mixture within 60 minutes.
The detection proves that the 3d equivalent bending toughness is 65.1 kJ/m3And 28d equivalent bending toughness of 55.4 kJ/m3And 28d equivalent bending toughness of 44.1 kJ/m3(ii) a 3d equivalent bending strength of 7.9N/mm2And 28d equivalent bending strength of 8.6N/mm2And 28d equivalent bending strength of 9.1N/mm2(ii) a 3d flexural strength of 11.9N/mm228d flexural strength 14.5N/mm260d flexural strength of 17.1N/mm2(ii) a 3d compressive strength of 28.1N/mm228d compressive strength of 47.2N/mm260d compressive strength of 52.1N/mm2。
Example 2:
the self-compacting high-ductility concrete comprises 35 parts by mass of cement, 20 parts by mass of fly ash, 15 parts by mass of mineral powder, 10 parts by mass of 0.5-2mm steel slag aggregate, 20 parts by mass of 3-5mm steel slag aggregate, 1.0% of polypropylene fiber by mass, 0.20% of water reducing agent by mass, 0.003% of biogel by mass, 0.03% of defoaming agent by mass, 0.03% of expanding agent by mass and 0.3 times of water by mass.
Step 1, respectively metering cement, slag powder, fly ash, steel slag aggregate, a water reducing agent, biological glue, a defoaming agent and an expanding agent;
step 2, placing the ingredients in the step 1 into a stirrer, and stirring to obtain dry powder materials, wherein the stirring time is not less than 2 minutes;
step 3, adding the polypropylene fibers into the dry powder material obtained in the step 2 in batches according to a set mixing proportion, and uniformly stirring for not less than 2 minutes;
and 4, adding water into the material obtained in the step 3 twice and uniformly stirring, wherein two thirds of the water is added for the first time, and the rest water is added for the second time. The stirring time is not less than 6 minutes, and the high-ductility concrete mixture is obtained.
The application method of the self-compacting high-ductility concrete comprises the steps of firstly processing the parts, needing to be reinforced, of the house beam plate column, the bridge or the bridge to support and build the template, reserving the grouting holes, and then completing pouring of the obtained high-ductility concrete mixture within 60 minutes.
The detection proves that the 3d equivalent bending toughness is 66.2 kJ/m3And 28d equivalent bending toughness of 56.1 kJ/m3And 28d equivalent bending toughness of 44.7 kJ/m3(ii) a 3d equivalent bending strength of 8.1N/mm2And 28d equivalent bending strength of 8.8N/mm2And 28d equivalent bending strength of 9.4N/mm2(ii) a 3d flexural strength of 12.6N/mm228d flexural strength 15.2N/mm260d flexural strength of 17.8N/mm2(ii) a 3d compressive strength of 29.0N/mm228d compressive strength 48.1N/mm260d compressive strength of 53.2N/mm2。
Example 3:
the self-compacting high-ductility concrete comprises 30 parts by mass of cement, 20 parts by mass of fly ash, 20 parts by mass of mineral powder, 10 parts by mass of 0.5-2mm steel slag aggregate, 20 parts by mass of 3-5mm steel slag aggregate, 1.0% of polypropylene fiber by mass, 0.20% of water reducing agent by mass, 0.003% of biogel by mass, 0.03% of defoaming agent by mass, 0.03% of expanding agent by mass and 0.3 times of water by mass.
Step 1, respectively metering cement, slag powder, fly ash, steel slag aggregate, a water reducing agent, biological glue, a defoaming agent and an expanding agent;
step 2, placing the ingredients in the step 1 into a stirrer, and stirring to obtain dry powder materials, wherein the stirring time is not less than 2 minutes;
step 3, adding the polypropylene fibers into the dry powder material obtained in the step 2 in batches according to a set mixing proportion, and uniformly stirring for not less than 2 minutes;
and 4, adding water into the material obtained in the step 3 twice and uniformly stirring, wherein two thirds of the water is added for the first time, and the rest water is added for the second time. The stirring time is not less than 6 minutes, and the high-ductility concrete mixture is obtained.
The application method of the self-compacting high-ductility concrete comprises the steps of firstly processing the parts, needing to be reinforced, of the house beam plate column, the bridge or the bridge to support and build the template, reserving the grouting holes, and then completing pouring of the obtained high-ductility concrete mixture within 60 minutes.
The detection proves that the 3d equivalent bending toughness is 63.4 kJ/m3And 28d equivalent bending toughness of 54.0 kJ/m3And 28d equivalent bending toughness of 42.9 kJ/m3(ii) a 3d equivalent bending strength of 7.6N/mm228d equivalent bending Strength of 8.2N/mm2And 28d equivalent bending strength of 8.9N/mm2(ii) a 3d flexural strength of 11.1N/mm228d flexural strength of 12.8N/mm260d bending resistanceStrength 15.8N/mm2(ii) a 3d compressive strength of 26.9N/mm228d compressive strength of 45.8N/mm260d compressive strength of 51.4N/mm2。
Example 4:
the self-compacting high-ductility concrete comprises, by mass, 35 parts of cement, 15 parts of fly ash, 20 parts of mineral powder, 10 parts of 0.5-2mm steel slag aggregate, 20 parts of 3-5mm steel slag aggregate, 1.0% of polypropylene fiber, 0.20% of water reducing agent, 0.003% of biogel, 0.03% of defoaming agent, 0.03% of expanding agent and 0.3 times of water.
Step 1, respectively metering cement, slag powder, fly ash, steel slag aggregate, a water reducing agent, biological glue, a defoaming agent and an expanding agent;
step 2, placing the ingredients in the step 1 into a stirrer, and stirring to obtain dry powder materials, wherein the stirring time is not less than 2 minutes;
step 3, adding the polypropylene fibers into the dry powder material obtained in the step 2 in batches according to a set mixing proportion, and uniformly stirring for not less than 2 minutes;
and 4, adding water into the material obtained in the step 3 twice and uniformly stirring, wherein two thirds of the water is added for the first time, and the rest water is added for the second time. The stirring time is not less than 6 minutes, and the high-ductility concrete mixture is obtained.
The application method of the self-compacting high-ductility concrete comprises the steps of firstly processing the parts, needing to be reinforced, of the house beam plate column, the bridge or the bridge to support and build the template, reserving the grouting holes, and then completing pouring of the obtained high-ductility concrete mixture within 60 minutes.
The detection proves that the 3d equivalent bending toughness is 64.4 kJ/m3And 28d equivalent bending toughness of 55.1 kJ/m3And 28d equivalent bending toughness of 44.0kJ/m3(ii) a 3d equivalent bending strength of 7.7N/mm228d equivalent bending Strength of 8.5N/mm2And 28d equivalent bending strength of 9.2N/mm2(ii) a 3d flexural strength of 12.6N/mm228d flexural strength 13.5N/mm2And 60d flexural strength of 16.9 N/mm2(ii) a 3d compressive strength of 27.9N/mm228d compressive strength of 47.2N/mm260d compressive strength of 53.1N/mm2。
The test results show that the self-compacting high-ductility concrete provided by the invention has the advantages that the fluidity and the strength are greatly higher than those of common concrete, and the self-compacting high-ductility concrete has high fluidity, high strength, high toughness and high crack resistance. In addition, the self-compacting concrete can also utilize industrial solid wastes such as steel slag, fly ash and slag in a large quantity, meets the requirement of resource regeneration and recycling, reduces the production cost, has environmental protection advantages and has higher social benefit and economic benefit.

Claims (12)

1. The self-compacting high-ductility concrete is characterized by comprising 30-35 parts by mass of cement, 15-20 parts by mass of fly ash, 15-20 parts by mass of mineral powder, 5-10 parts by mass of 0.5-2mm steel slag aggregate, 20-25 parts by mass of 3-5mm steel slag aggregate, 0.8-1.2% of polypropylene fiber by mass, 0.10-0.25% of water reducing agent by mass, 0.001-0.005% of biogel by mass, 0.03% of defoaming agent by mass, 0.03% of expanding agent by mass and 0.25-0.35 times of water by mass.
2. The self-compacting high ductility concrete according to claim 1, wherein the cement is p.o52.5 portland cement.
3. The self-compacting high ductility concrete according to claim 1, wherein the fly ash is class i ash.
4. The self-compacting high ductility concrete as claimed in claim 1, wherein the ore powder is S95 ore powder.
5. The self-compacting high ductility concrete as claimed in claim 1, wherein the steel slag aggregate has a grain size of 0.5-2mm and 3-5 mm.
6. The self-compacting high ductility concrete as claimed in claim 1, wherein the modified polypropylene fiber has a tensile strength of more than 600MPa and an elastic modulus of 5-7 GPa.
7. The self-compacting high ductility concrete according to claim 1, wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
8. The self-compacting high ductility concrete according to claim 1, wherein the bio-gum is welan gum.
9. The self-compacting high ductility concrete according to claim 1, wherein the defoaming agent is a silicone defoaming agent.
10. The self-compacting high ductility concrete according to claim 1, wherein the expanding agent is a plastic expanding agent.
11. The method for preparing self-compacting high ductility concrete as claimed in claim 1, wherein: comprises that
Step 1, respectively metering cement, slag powder, fly ash, steel slag aggregate, a water reducing agent, biological glue, a defoaming agent and an expanding agent;
step 2, placing the ingredients in the step 1 into a stirrer, and stirring to obtain dry powder materials, wherein the stirring time is not less than 2 minutes;
step 3, adding the polypropylene fibers into the dry powder material obtained in the step 2 in batches according to a set mixing proportion, and uniformly stirring for not less than 2 minutes;
step 4, adding water into the material obtained in the step 3 twice and uniformly stirring, wherein two thirds of the water is added for the first time, and the rest water is added for the second time; the stirring time is not less than 6 minutes, and the high-ductility concrete mixture is obtained.
12. The application method of the self-compacting high-ductility concrete as claimed in claim 1 or claim 12, wherein the self-compacting high-ductility concrete obtained in step 4 is applied by firstly processing the place where the house beam plate column, the bridge or the bridge needs to be reinforced to support the formwork, leaving the grouting hole, and then completing the pouring of the obtained high-ductility concrete mixture within 60 minutes.
CN202010285854.4A 2020-04-13 2020-04-13 Self-compacting high-ductility concrete and preparation method thereof Pending CN113526921A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113863470A (en) * 2021-10-28 2021-12-31 上海二十冶建设有限公司 Concrete drain pipeline collar joint structure and construction method

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Publication number Priority date Publication date Assignee Title
CN1915890A (en) * 2006-09-04 2007-02-21 大连理工大学 Self-dense concrete of mixed fiber with fly ash in use for prefabricated acoustic barrier
CN102211918A (en) * 2011-05-09 2011-10-12 同济大学 Rapid structural strengthening material taking steel slag as aggregate
CN102617085A (en) * 2011-01-30 2012-08-01 中铁八局集团建筑工程有限公司 Self-compacting concrete for foundation of high speed railway turnout plate
KR20140105965A (en) * 2013-02-25 2014-09-03 경북대학교 산학협력단 Hybrid material of self consolidating concrete(scc)
CN105016671A (en) * 2014-04-29 2015-11-04 黄贺明 Superfluid self-compacting concrete and preparing method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1915890A (en) * 2006-09-04 2007-02-21 大连理工大学 Self-dense concrete of mixed fiber with fly ash in use for prefabricated acoustic barrier
CN102617085A (en) * 2011-01-30 2012-08-01 中铁八局集团建筑工程有限公司 Self-compacting concrete for foundation of high speed railway turnout plate
CN102211918A (en) * 2011-05-09 2011-10-12 同济大学 Rapid structural strengthening material taking steel slag as aggregate
KR20140105965A (en) * 2013-02-25 2014-09-03 경북대학교 산학협력단 Hybrid material of self consolidating concrete(scc)
CN105016671A (en) * 2014-04-29 2015-11-04 黄贺明 Superfluid self-compacting concrete and preparing method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113863470A (en) * 2021-10-28 2021-12-31 上海二十冶建设有限公司 Concrete drain pipeline collar joint structure and construction method

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Application publication date: 20211022