CN112047677A - Ultrahigh-performance concrete joint mixture - Google Patents

Ultrahigh-performance concrete joint mixture Download PDF

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Publication number
CN112047677A
CN112047677A CN202010782446.XA CN202010782446A CN112047677A CN 112047677 A CN112047677 A CN 112047677A CN 202010782446 A CN202010782446 A CN 202010782446A CN 112047677 A CN112047677 A CN 112047677A
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China
Prior art keywords
parts
performance concrete
high performance
ultra
weight
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Pending
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CN202010782446.XA
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Chinese (zh)
Inventor
杨医博
罗家豪
陈勇
林志威
韦晓鹏
韩翌
郭文瑛
王恒昌
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN202010782446.XA priority Critical patent/CN112047677A/en
Publication of CN112047677A publication Critical patent/CN112047677A/en
Pending legal-status Critical Current

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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
    • 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
    • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04—Macromolecular compounds
    • C04B16/06—Macromolecular compounds fibrous
    • C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B16/0641—Polyvinylalcohols; Polyvinylacetates
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
    • C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • C04B2111/00672—Pointing or jointing materials
    • 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)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention belongs to the technical field of building materials, and discloses an ultrahigh-performance concrete gap filler. The ultra-high performance concrete gap filler comprises the following components in parts by weight: 100 parts of a cementing material, 90-120 parts of sand, 5-8 parts of an expanding agent, 0.08-0.2 part of cellulose ether, 0.15-0.25 part of a defoaming agent, 1-3 parts of a water reducing agent, 16-19 parts of water and 0-2.5 parts of redispersible latex powder. The underfill also includes PVA fibers. The joint mixture has ultrahigh strength and durability, higher bonding force and crack resistance, and is suitable for filling the abutted seams of ultrahigh-performance concrete products.

Description

Ultrahigh-performance concrete joint mixture
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an ultra-high performance concrete gap filler.
Background
The ultra-high performance concrete is a high performance cement-based material developed at the end of the 20 th century, and has ultra-high strength and ultra-high durability, the compressive strength is usually over 100MPa, and the electric quantity value is lower than 40C.
The method for preparing the prefabricated member from the ultra-high performance concrete is the main using method at present, and the splicing seam of the prefabricated member usually adopts a wet seam mode. For smaller size patchworks, however, the wet seam approach is difficult to implement. For the seam with smaller size, organic materials or common gap fillers are mostly adopted for filling at present. However, the joint mixture has insufficient durability life (for example, the joint mixture has poor durability in the environment of sunshine, ocean and other chlorine salts), cannot reach the same service life as the structure, and is difficult to maintain; the properties such as compressive strength and the like need to be improved. Therefore, there is an urgent need to develop a caulking material that matches ultra-high performance concrete.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide the ultra-high performance concrete gap filler for filling the abutted seams among ultra-high performance concrete products.
The purpose of the invention is realized by the following technical scheme:
the ultra-high performance concrete joint mixture comprises the following components in parts by weight: 100 parts of a cementing material, 90-120 parts of sand, 5-8 parts of an expanding agent, 0.08-0.2 part of cellulose ether, 0.15-0.25 part of a defoaming agent, 1-3 parts of a water reducing agent, 16-19 parts of water and 0-2.5 parts of a redispersible latex powder.
The cementing material comprises, by weight, 10-20 parts of silica fume, 0-10 parts of fly ash, 0-15 parts of granulated blast furnace slag powder, 0-10 parts of limestone powder and the balance of cement; the total amount of the raw materials in the cementing material is 100 parts by weight.
The grain diameter of the sand is less than or equal to 0.6mm, preferably less than or equal to 0.3 mm.
The expanding agent comprises calcium oxide type, ettringite type and the like, and composite expanding agents can also be adopted.
The weight portion of the redispersible latex powder is preferably 1.5 to 2.5 portions.
The ultra-high performance concrete gap filler also comprises PVA fibers (polyvinyl alcohol), and the weight fraction of the PVA fibers is preferably 0.4-0.8 part.
The cellulose ethers of the present invention may be any cellulose ethers commonly used in cement-based materials.
The redispersible latex powder in the invention can be any commonly used dispersible latex powder in cement-based materials. In particular, the redispersible latex powder with good compatibility with gelled materials and the like can be selected.
The water reducing agent is a polycarboxylic acid water reducing agent, and can be powder or an aqueous agent, and when the aqueous agent is adopted, the water content is recorded in the water consumption of the joint mixture.
The fluidity of the ultra-high performance concrete gap filler is controlled to be 160-180mm when in use, and is controlled by adjusting the using amount of the water reducing agent and the water consumption. The fluidity adopts a fluidity determination method in a cement mortar fluidity determination method (GB/T2419-2005), and tools are a truncated cone circular mold (the inner diameter of an upper opening is 70mm, and the inner diameter of a lower opening is 100mm) and a square glass plate of 500 multiplied by 500 mm; fluidity determination test procedure: and (3) loading the mixed ultra-high performance concrete slurry into a test mold at one time, tamping by using a tamping bar, scraping the surface of the test mold by using a plaster knife, and slightly lifting the test mold by using hands. And after the concrete is basically stable and unchanged, measuring the maximum diameter and the diameter in the direction vertical to the maximum diameter by using a straight ruler, and taking the average value of the maximum diameter and the diameter as the fluidity of the batch of the joint mixture.
The ultra-high performance concrete gap filler is used for filling the abutted seams among ultra-high performance concrete products.
Compared with the prior art, the invention has the beneficial effects that:
(1) the joint mixture further improves the binding force between the joint mixture and the ultra-high performance concrete product on the premise of keeping the ultra-high strength (the compressive strength is more than 100MPa) and the durability of the ultra-high performance concrete.
(2) The anti-cracking performance of the anti-cracking agent is further improved by adding the expanding agent and the PVA fiber, and the anti-cracking agent can effectively prevent the invasion of external corrosive substances.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Comparative example
The ultra-high performance concrete comprises the following components in parts by weight: 70 parts of 42.5R portland cement, 20 parts of silica fume, 5 parts of fly ash, 5 parts of granulated blast furnace slag powder, 100 parts of sand with the maximum particle size of 0.3mm, 1 part of water reducing agent powder (CASTAMENT FS20 produced by Germany Pasteur company) and 17 parts of water.
Example 1
The ultra-high performance concrete gap filler comprises the following components in parts by weight: 65 parts of 42.5R portland cement, 20 parts of silica fume, 5 parts of fly ash, 5 parts of granulated blast furnace slag powder, 5 parts of limestone powder, 100 parts of sand with the maximum particle size of 0.3mm, 5 parts of a calcium oxide type expanding agent, 0.08 part of cellulose ether (MKX 15000PP20 type cellulose ether of Dow company), 0.15 part of defoaming agent (AGITAN P8850 produced by MUNZING-CHEMIE company in Germany), 1 part of powder of water reducing agent (CASTAMENT FS20 produced by Pasteur company in Germany) and 17 parts of water.
Example 2
The ultra-high performance concrete gap filler comprises the following components in parts by weight: 70 parts of 42.5R portland cement, 20 parts of silica fume, 5 parts of fly ash, 5 parts of granulated blast furnace slag powder, 100 parts of sand with the maximum particle size of 0.6mm, 6 parts of composite expanding agent (3 parts of calcium oxide type and 3 parts of ettringite type), 0.2 part of cellulose ether, 0.25 part of defoaming agent, 3 parts of water agent (broken solid) of water reducing agent (QL-PC 5B produced by Jiangmen strong building materials science and technology Limited company), 18 parts of water (water containing the water reducing agent), 2 parts of redispersible latex powder (5010N produced by Germany Wake chemical company) and 0.6 part of PVA fiber (polyvinyl alcohol).
And (3) performance testing: the test results are shown in table 1.
TABLE 1 Performance test results of concrete joint mixture of examples 1-2 and comparative examples
Figure BDA0002620721080000031
The compression and bending strength test block is formed by a triple die with the size of 40mm multiplied by 160mm according to JC/T1004-2006 ceramic wall and floor tile joint mixture, demoulded after 1d, and maintained to the specified age of 28d under the standard conditions (the temperature is 23 +/-2 ℃, and the humidity is 50 +/-5%). The compressive strength loading speed is set to 0.8kN/S, and the flexural strength loading speed is set to 0.4 kN/S.
The tensile strength and the original tensile bonding test are carried out after being cured for 28 days under standard conditions; the water immersion tensile bond test was carried out after standard curing for 7 days and then curing in water at (20. + -. 2). degree.C. for 21 days, and the test piece was wiped dry before the test. The heat aging tensile bond test was carried out after standard curing for 14 days, the test piece was placed in an air oven at (70. + -. 2) ° C for 14 days. The tensile strength and various bonding strengths were tested by the 8-letter method according to DB44/T1116-2003 Cement Special for ordinary ready-mixed mortar.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (8)

1. The ultra-high performance concrete gap filler is characterized in that: the paint comprises the following components in parts by weight: 100 parts of a cementing material, 90-120 parts of sand, 5-8 parts of an expanding agent, 0.08-0.2 part of cellulose ether, 0.15-0.25 part of a defoaming agent, 1-3 parts of a water reducing agent, 16-19 parts of water and 0-2.5 parts of redispersible latex powder.
2. The ultra high performance concrete caulking agent according to claim 1, wherein: the cementing material comprises, by weight, 10-20 parts of silica fume, 0-10 parts of fly ash, 0-15 parts of granulated blast furnace slag powder, 0-10 parts of limestone powder and the balance of cement; the total amount of each raw material in the cement is 100 parts by weight.
3. The ultra high performance concrete caulking agent according to claim 1, wherein: the grain diameter of the sand is less than or equal to 0.6 mm.
4. The ultra high performance concrete caulking agent according to claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
5. The ultra high performance concrete caulking agent according to claim 1, wherein:
the weight portion of the redispersible latex powder is 1.5-2.5.
6. The ultra high performance concrete caulking agent according to claim 1, wherein: the composite material also comprises PVA fibers, and the weight fraction of the PVA fibers is 0.4-0.8.
7. The ultra high performance concrete caulking agent according to claim 1, wherein: the fluidity of the ultra-high performance concrete gap filler is controlled to be 160-180mm when in use.
8. The use of the ultra high performance concrete joint mixture according to any one of claims 1 to 7, wherein: the ultra-high performance concrete gap filler is used for filling the abutted seams of ultra-high performance concrete products.
CN202010782446.XA 2020-08-06 2020-08-06 Ultrahigh-performance concrete joint mixture Pending CN112047677A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116535177A (en) * 2023-05-24 2023-08-04 中建海峡建设发展有限公司 Soil grouting material formula and process for repairing crack of rammed earth wall

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006213589A (en) * 2005-02-04 2006-08-17 Nippon Koei Co Ltd Void filling material and its producing method
CN103121818A (en) * 2013-02-27 2013-05-29 同济大学 Assembled splicing joint sealing material for building components and application thereof
CN105503072A (en) * 2015-12-10 2016-04-20 华砂砂浆有限责任公司 Tile grout composition and preparation method and application thereof
CN106348677A (en) * 2016-08-17 2017-01-25 中交第二航务工程局有限公司 Ultrahigh-performance concrete and preparation method and application thereof
CN109592947A (en) * 2019-01-28 2019-04-09 上海市政工程设计研究总院（集团）有限公司 A kind of ultra-high performance concrete and preparation method for reinforcing underwater concrete structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006213589A (en) * 2005-02-04 2006-08-17 Nippon Koei Co Ltd Void filling material and its producing method
CN103121818A (en) * 2013-02-27 2013-05-29 同济大学 Assembled splicing joint sealing material for building components and application thereof
CN105503072A (en) * 2015-12-10 2016-04-20 华砂砂浆有限责任公司 Tile grout composition and preparation method and application thereof
CN106348677A (en) * 2016-08-17 2017-01-25 中交第二航务工程局有限公司 Ultrahigh-performance concrete and preparation method and application thereof
CN109592947A (en) * 2019-01-28 2019-04-09 上海市政工程设计研究总院（集团）有限公司 A kind of ultra-high performance concrete and preparation method for reinforcing underwater concrete structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116535177A (en) * 2023-05-24 2023-08-04 中建海峡建设发展有限公司 Soil grouting material formula and process for repairing crack of rammed earth wall

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Application publication date: 20201208