WO2001085641A1 - Beton resistant a la rupture - Google Patents

Beton resistant a la rupture Download PDF

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Publication number
WO2001085641A1
WO2001085641A1 PCT/JP2000/002972 JP0002972W WO0185641A1 WO 2001085641 A1 WO2001085641 A1 WO 2001085641A1 JP 0002972 W JP0002972 W JP 0002972W WO 0185641 A1 WO0185641 A1 WO 0185641A1
Authority
WO
WIPO (PCT)
Prior art keywords
explosion
fiber
fibers
concrete
resistant concrete
Prior art date
Application number
PCT/JP2000/002972
Other languages
English (en)
Japanese (ja)
Inventor
Toshio Yonezawa
Akio Kodaira
Hideo Fujinaka
Kenrou Mitsui
Nobuyuki Yamazaki
Akira Nishida
Takeshi Morita
Original Assignee
Takenaka Corporation
Shimizu Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Takenaka Corporation, Shimizu Corporation filed Critical Takenaka Corporation
Priority to DE10085471T priority Critical patent/DE10085471T1/de
Priority to FR0005956A priority patent/FR2808795A1/fr
Priority to GB0226053A priority patent/GB2379928A/en
Priority to PCT/JP2000/002972 priority patent/WO2001085641A1/fr
Publication of WO2001085641A1 publication Critical patent/WO2001085641A1/fr
Priority to NO20025314A priority patent/NO20025314D0/no
Priority to SE0203314A priority patent/SE0203314L/xx
Priority to DK200201717A priority patent/DK200201717A/da

Links

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
    • 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
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • 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
    • C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]

Definitions

  • the present invention relates to concrete excellent in explosion resistance in a fire that can be used for structures that may be subject to fire, such as buildings and tunnels. Background art
  • Higher-strength concrete can be obtained by reducing the ratio of water to the binder in concrete, that is, cement, slag, fly ash, silica film, and other materials that undergo hydration in concrete.
  • Increasing the strength of concrete can benefit in various ways, such as reducing the cross-sectional dimensions of building columns and increasing the height of buildings.
  • the surface concrete can easily explode due to water vapor pressure, thermal stress, etc. in a high-temperature environment such as a fire, which may cause various problems. It is known that there is.
  • the following technologies are known to suppress the explosion of buildings using such high-strength concrete.
  • Japanese Patent Publication No. 57-201 126 It describes acetate of 2 O mm, thickness of 1 to 25 denier, or an extruded plate containing 0.5 to 2.0% of rayon fiber by weight of cement asbestos. There is disclosure that a hole is formed and explosion is prevented by allowing water vapor to escape from this portion.
  • Japanese Patent Laid-Open No. No. 1284 describes a method to prevent explosion by mixing hollow polypropylene fibers and letting steam escape from the pores of the fibers.
  • Japanese Patent Publication No. Sho 62-121197 Describes a method for preventing explosion by securing 1 to 5 ⁇ pores in an asbestos cement having a porosity of 30 to 60% by mixing pearlite or pulp to 10% or more of the voids. ing.
  • the method of mixing filler such as fiber into concrete is suitable for high-strength concrete. Although it can be used, mixing an effective amount that has the effect of suppressing explosion will reduce the fluidity of concrete, making it difficult to cast into the formwork at the construction site.
  • high-strength concrete achieves high strength by reducing the ratio of the amount of water to binders such as cement. As the ratio of water binder decreases, the plastic viscosity increases and the workability deteriorates.Therefore, the development of a surfactant as a dispersant for high-strength cement and the use of ultrafine particles with vitreous silica force The required fluidity is secured by using silica fume. Therefore, it is not possible to mix a large amount of fibers with the aim of ensuring resistance to explosion, and to reduce the flowability.
  • the inventors of the present invention have focused on the fact that the technique of mixing fibers made of an organic material is effective in preventing explosion and has high economical efficiency. After examining various effective means applied to high-strength concrete, the present invention was completed.
  • the present inventors examined conventionally known organic fiber materials and found that there was a great difference in the explosion prevention effect due to the difference in the amount of evaporation when the fiber was heated to 500 ° C. Based on the results, the present inventors have found that the above object can be achieved by using a specific material that can form voids efficiently under high temperature conditions.
  • the explosion-resistant concrete of the present invention is made of an organic material having a weight retention of 30% or less when heated to 500 ° C., having a diameter of 5 to 200 ⁇ 111 and a length of 5 to 40 mm.
  • the organic fiber of the present invention is characterized by containing from 0.02 to 0.3% by volume of the organic fiber and having a water binder ratio of 35% or less.
  • Figures 1A to 1C are model diagrams showing effective concrete columns and fiber holes for explosion resistance studies.
  • Figure 2 is a graph showing the relationship between the diameter of the effective concrete column and the amount of fiber mixed into the concrete for each fiber diameter.
  • Figure 3 is a graph showing the relationship between the fiber mixing ratio and fluidity of explosion-resistant concrete mixed with organic fibers.
  • Figure 4 is a graph showing the relationship between the weight loss rate of explosion-resistant concrete containing organic fibers and the fiber mixing rate.
  • FIG. 5 is a graph of a standard heating curve used for heating a test piece in the fire resistance test of 7 of the following Examples. BEST MODE FOR CARRYING OUT THE INVENTION
  • an organic fiber to be added to concrete a fiber formed of an organic material having a weight retention of 30% or less when heated to 500 ° C. is used.
  • an organic material having a low melting point is considered to be preferable.
  • the present inventors have studied and found that an organic material does not necessarily exhibit excellent explosion resistance simply by having a low melting point, and explosion resistance is related to the residual weight ratio when heated to 500 ° C. I found something to do.
  • the weight retention rate of various organic fibers when heated at 500 ° C is from 10% to 20%.
  • the residual weight ratio at the time of heating at 500 ° C. exceeds 30%, the formation of water vapor escape holes due to the evaporation of the fibers is insufficient, and the explosion resistance decreases.
  • the residual weight ratio at the time of heating to 500 ° C is 30% or less, large holes having a volume equivalent to the fiber volume before evaporation are formed due to the evaporation of the fibers, and the holes escape the water vapor. Since it functions well as a hole, it exhibits favorable explosion resistance.
  • each fiber present in the concrete matrix quickly forms effective pores after heating, the amount of fiber used can be reduced. Since the amount of fiber used is small, the effect on the fluidity of concrete is small, and high-strength concrete with good workability can be economically realized.
  • organic materials constituting these organic fibers natural organic materials, semi-synthetic organic materials, or synthetic organic materials that are decomposed or melted by heating in a fire to cause a sharp decrease in volume are used. Used.
  • the residual weight ratio of polypropylene and polyvinyl alcohol is 1 4% and 18%, which meet the requirements of the present invention.
  • polyvinyl chloride and acrylic fibers are not suitable as the fibers of the present invention because the residual weight ratio exceeds 30%.
  • the natural organic material, the semi-synthetic organic material, or the synthetic organic material constituting the organic fiber of the present invention may be melted or evaporated by heating to cause a rapid decrease in volume, In particular, the residual weight ratio when heated to 500 ° C must be 30% or less. Therefore, it is necessary to select from known synthetic resins, natural fibers, synthetic fibers, semi-synthetic fibers and the like in consideration of the above conditions.
  • Preferred examples of the material include a polypropylene-based material, a polyvinyl alcohol-based material, and a vinylidene-based material.
  • the shape of the organic fiber is directly related to the shape of the pore formed by evaporation of the organic fiber.
  • the effect of the pores that is, the effect of the water vapor vent hole, which provides resistance to explosion during heating, differs depending on the fiber diameter, the amount of fiber mixed in, and the concrete strength, etc. studied here.
  • the state of the fibers (diameter d f ) dispersed in the concrete is modeled as a state in which the fibers are uniformly covered with the cover concrete and distributed in parallel as shown in Fig. 1A.
  • water vapor from a cylindrical concrete part (hereinafter referred to as an “effective concrete column”) approximated by a hexagon as shown in Fig. 1B escapes. become.
  • This movement of water vapor is indicated by an arrow in FIG. 1C.
  • the pores formed by the fibers allow water vapor from the area of the cover concrete to escape from the holes.
  • Figure 2 is a graph showing the relationship between the effective concrete column diameter d c (mm) and the amount of fiber mixed into the concrete V f (volume%) for each fiber diameter.
  • Figure From Fig. 2 it can be seen that the diameter of the effective concrete column decreases as the fiber mixing ratio increases, and that the diameter of the effective concrete column decreases as the fiber diameter decreases.
  • the smaller the diameter of the effective concrete pillar the narrower the area where water vapor is collected in one fiber hole, and thus the more effective the explosion prevention effect. It will be big. In other words, it is clear that the higher the fiber mixing ratio and the smaller the fiber diameter, the more effective it is in preventing explosion.
  • the rate at which water vapor is collected in one fiber hole depends on the strength of the concrete, that is, the density of the tissue. Therefore, the diameter of the effective concrete column required to prevent explosion decreases as the strength increases.
  • the present inventors conducted a loading heating experiment on a reinforced concrete column. For 3 hours, the amount of fiber required to maintain 1/3 of the strength (normal maximum value of long-term load) is determined by using polypropylene fibers with a fiber diameter of 20 m and concrete with different compressive strength. And evaluated.
  • the compressive strength of concrete is 800 kgf / cm 2
  • the necessary fiber content is 0.01 to 0.02% by volume
  • the compressive strength of concrete is 1 000 kgf Zcm 2
  • the diameter of the effective concrete column required explosion prevention, 2. 0 2. about 5 mm in case the compressive strength of the concrete is SOO kg fZcm 2, compression of the concrete
  • the strength is l OOO kgf Zcm 2 , it is estimated to be around 1. Omm.
  • the model diagram in FIG. 1 A to FIG 1 C It is necessary to set the diameter (d c ) of the effective concrete column shown to be within the range of 2. Omm or less.
  • the fiber diameter is between 5 and 200 m. Less than 5 ⁇ ⁇ When it exceeds 200 tm, it is difficult to exhibit sufficient explosion resistance to high-density concrete.
  • the length of the fiber is preferably 5 to 4 O mm. If it is less than 5 mm, the effect of preventing explosion will be insufficient, and if the fiber length exceeds 4 Omm, the dispersion of fibers will be poor and it will be difficult to obtain uniform concrete.
  • These organic fibers are mixed into concrete so that they are substantially uniformly dispersed without agglomeration. These organic fibers are not added all at once, but rather in small portions continuously or in small portions during the kneading phase of the concrete material using a mixing device. It is preferably added to the material.
  • 0 mixed amount of fiber needed for explosion prevention of high-strength concrete Ichiboku is the volume of the concrete. 0 2 to 0.3 volume 0/0, i.e., 1 111 3 per Li 0. 2 with 3 liters is there.
  • the organic fiber of the present invention occur quickly evaporates at high temperatures, even in the case of using the fiber easily forms an effective air gap, 0. 0 2 volume% Sunawachi 0. Explosion prevention is less than 2? Zm 3 If the effect is insufficient and 0.3% by volume, that is, 3 liters Zm 3 or more is mixed, the fluidity of the concrete is reduced, and neither is preferable.
  • the organic fiber according to the present invention is flexible, and has little effect on its fluidity even when dispersed in concrete. By dispersing this fiber into concrete as a filler, water vapor generated in the event of a fire in the event of a fire escapes to the outside, effectively preventing explosion of the concrete.
  • Concrete water binder ratio In the case of ordinary concrete exceeding 35%, the effect of explosion occurring in concrete at the time of fire is a level that does not cause a problem.
  • the present invention can be said to be particularly useful when applied to high-strength concrete having a water binder ratio of 35% or less.
  • Fine aggregate mountain sand (specific gravity 2.55, water absorption 1.54%) and hard sandstone
  • Admixture powdered silica film (specific gravity 2.2, specific surface area 14m 2 Zg,
  • Admixture Polycarboxylate-based high-performance A E water reducer (trade name: Tupole HP-11, Takemoto Yushi Co., Ltd.)
  • Organic fiber A polypropylene fiber having a diameter of 20 ⁇ , a length of 19mm, and a weight retention rate of 14% when heated to 500 ° C was used.
  • the organic fibers were mixed in the concrete prepared above under the conditions of 0.05% by volume, 0.10% by volume, 0.20% by volume, and 0.30% by volume.
  • a 100 litter pan type forced remixer was used. The amount of each kneading was 60 liters. After sand, cement, and silica foam were kneaded for 15 seconds, water and an admixture were added, kneaded and mixed for 1 minute, and then coarse aggregate was added. The mixing time after the addition of the coarse aggregate was 2 minutes, and the fibers were mixed during the first 30 seconds.
  • the concrete containing 0.05% by volume of organic fiber was used in Example 1, the concrete containing 0.1% by volume was used in Example 2, and the concrete containing 0.2% by volume was used in Examples 3 and 0. . 3% by volume was used as Example 4.
  • Example 1 the fiber to be mixed was replaced with the organic fiber, and an acrylic fiber having a diameter of 17 m, a length of 20 mm, and a residual weight of 76% when heated to 500 ° C was used. Concrete was produced in the same manner as in Example 1 except that the amounts were 0%, 0.05% by volume, 0.1% by volume, 0.2% by volume, and 0.3% by volume. 2 to 6. Similarly to Example 1, the concretes of Comparative Examples 2 to 6 were subjected to the (6) concrete fluidity test and (7) fire resistance test. The results are shown in Table 2. Table 2
  • the present invention has an effect that explosion can be effectively suppressed without lowering fluidity, and an economical high-strength explosion-resistant concrete can be provided.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un béton résistant à la rupture, caractérisé en ce qu'il contient entre 0,02 et 0,3 % en volume de fibre organique comprenant une matière organique dont le pourcentage résiduel en poids est de 30 % ou moins après traitement thermique à 500 °C, dont le diamètre est compris entre 5 et 200 νm et la longueur, entre 5 et 40 mm, la proportion d'eau par rapport aux matières de liaison étant de 35 % ou moins.
PCT/JP2000/002972 2000-05-10 2000-05-10 Beton resistant a la rupture WO2001085641A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE10085471T DE10085471T1 (de) 2000-05-10 2000-05-10 Beton mit verbesserter Wiederstandsfähigkeit gegen Absplittern
FR0005956A FR2808795A1 (fr) 2000-05-10 2000-05-10 Beton ayant une resistance amelioree a l'eclatement
GB0226053A GB2379928A (en) 2000-05-10 2000-05-10 Concrete being resistant to rupture
PCT/JP2000/002972 WO2001085641A1 (fr) 2000-05-10 2000-05-10 Beton resistant a la rupture
NO20025314A NO20025314D0 (no) 2000-05-10 2002-11-06 Betong som ikke avskaller under brann
SE0203314A SE0203314L (sv) 2000-05-10 2002-11-08 Sprickfast betong och metod för dess framställning
DK200201717A DK200201717A (da) 2000-05-10 2002-11-08 Beton med forbedret modstand mod afskalning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0005956A FR2808795A1 (fr) 2000-05-10 2000-05-10 Beton ayant une resistance amelioree a l'eclatement
PCT/JP2000/002972 WO2001085641A1 (fr) 2000-05-10 2000-05-10 Beton resistant a la rupture

Publications (1)

Publication Number Publication Date
WO2001085641A1 true WO2001085641A1 (fr) 2001-11-15

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PCT/JP2000/002972 WO2001085641A1 (fr) 2000-05-10 2000-05-10 Beton resistant a la rupture

Country Status (2)

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FR (1) FR2808795A1 (fr)
WO (1) WO2001085641A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112430014A (zh) * 2020-10-29 2021-03-02 昆明华城兴建材有限公司 一种增强纤维水泥防爆墙及其生产工艺

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7141284B2 (en) 2002-03-20 2006-11-28 Saint-Gobain Technical Fabrics Canada, Ltd. Drywall tape and joint
US7311964B2 (en) 2002-07-30 2007-12-25 Saint-Gobain Technical Fabrics Canada, Ltd. Inorganic matrix-fabric system and method
DK2172434T3 (en) * 2008-10-02 2015-06-01 Redco Sa Fiber Cement Product composition and shaped products made thereby.
KR100921406B1 (ko) * 2009-02-27 2009-10-14 (주)대우건설 내화성 고강도 콘크리트

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02107546A (ja) * 1988-10-13 1990-04-19 Showa Shell Sekiyu Kk 緻密溝造でかつ耐熱性の高いセメント系成形物の製造方法
JPH0812391A (ja) * 1994-07-04 1996-01-16 Daiwabo Co Ltd セメント補強用集束繊維
JPH1179807A (ja) * 1997-08-28 1999-03-23 Takenaka Komuten Co Ltd 耐爆裂性コンクリート
JPH11303245A (ja) * 1998-04-21 1999-11-02 Shimizu Corp コンクリート構造物の爆裂制御方法、コンクリートの爆裂深さ予測方法、および耐爆裂性を有する合成繊維混入コンクリート

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4419454A (en) * 1981-12-14 1983-12-06 The Babcock & Wilcox Company Rapid-fire refractories
DE4220274C2 (de) * 1992-06-20 1997-08-21 Hans Jaklin Gegen Abplatzungen bei Brandbeanspruchung beständiges Bauteil
FR2778654B1 (fr) * 1998-05-14 2000-11-17 Bouygues Sa Beton comportant des fibres organiques dispersees dans une matrice cimentaire, matrice cimentaire du beton et premelanges
FR2804952B1 (fr) * 2000-02-11 2002-07-26 Rhodia Chimie Sa Composition de beton ultra haute performance resistant au feu

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02107546A (ja) * 1988-10-13 1990-04-19 Showa Shell Sekiyu Kk 緻密溝造でかつ耐熱性の高いセメント系成形物の製造方法
JPH0812391A (ja) * 1994-07-04 1996-01-16 Daiwabo Co Ltd セメント補強用集束繊維
JPH1179807A (ja) * 1997-08-28 1999-03-23 Takenaka Komuten Co Ltd 耐爆裂性コンクリート
JPH11303245A (ja) * 1998-04-21 1999-11-02 Shimizu Corp コンクリート構造物の爆裂制御方法、コンクリートの爆裂深さ予測方法、および耐爆裂性を有する合成繊維混入コンクリート

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112430014A (zh) * 2020-10-29 2021-03-02 昆明华城兴建材有限公司 一种增强纤维水泥防爆墙及其生产工艺

Also Published As

Publication number Publication date
FR2808795A1 (fr) 2001-11-16

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