CN106495592B - Fiber-reinforced porous explosion-proof concrete with negative Poisson ratio effect and preparation method thereof - Google Patents
Fiber-reinforced porous explosion-proof concrete with negative Poisson ratio effect and preparation method thereof Download PDFInfo
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Classifications
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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
-
- 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
- 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
- C04B28/06—Aluminous 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
- 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
- C04B28/14—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 calcium sulfate 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
- 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
- C04B28/34—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 cold phosphate binders
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The fiber reinforced porous explosion-proof concrete with the negative Poisson ratio effect consists of a porous concrete matrix containing a communicating pore structure or an inward concave pore structure and a reinforcement body array constructed by a plurality of fiber structure units in special forms. The fiber structure unit in a special form consists of 2-4 layers of fiber hinges which are arranged in parallel, the layer spacing is 10mm-50mm, and the fiber hinges are in an axisymmetric polygonal structure with inward concave angles; the diameter of the circumcircle of the axisymmetric polygon is 9mm-54 mm. According to the invention, a porous concrete matrix with a negative Poisson ratio effect and a special-form fiber structure unit with the negative Poisson ratio effect are combined, so that the Poisson ratio of the original porous concrete matrix can reach-0.53 and-0.98 respectively at the minimum, and the storage modulus is improved by 320% and 418% respectively; the absorbing capacity of the explosion load is greatly improved, and the original structure is kept from being damaged to a great extent.
Description
Technical field
The invention belongs to building field, it is related to a kind of fiber reinforcement celluar concrete and preparation method thereof, specifically, relating to
And a kind of porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio and preparation method thereof.
Background technique
In recent years, domestic, international community explosive incident emerges one after another.It is broken for person property caused by blast load
Bad, measure the most direct is the effective infrastructure explosion-proof lamp of design.However, the design concept master of conventional concrete
If improving self-strength, can not play a positive role for the elimination of blast process dredged with energy transmission.And from power
Angle analysis is learned, the basic problem of explosion is energy and non-force.Therefore, when the density of load is more than critical strength, tradition is mixed
Solidifying soil has the explosion products such as broken concrete or the metal fragmentation of huge kinetic energy by directly release, realizes energy release, because
This, easily causes the secondary injury to personal property.Currently, building trade more requires to be lightweight to celluar concrete；Though
The research and development of its right explosion-proof performance are also reported, but still are confined to realize antiknock by improving self-strength.In addition, being used for
The pore design of the celluar concretes of building structure such as filling wall is concentrated mainly on pore-size size and distributed controll, to hole
Form have no concern.
The negative of transverse strain and longitudinal strain ratio when Poisson's ratio refers to material stress and deformation is outside reflection material is resisted
One important parameter of portion's load-carrying ability.Poisson's ratio is smaller, and material transverse strain during stress and deformation is bigger；On the contrary, then
It is smaller.The Poisson's ratio of general material is between 0 to 0.7.Common material occurs necking penomena when being acted on by longitudinal tension stress,
Its Poisson's ratio is positive value.And negative poisson's ratio material, i.e. auxetic materials (Auxetic is originated from Greek), deformation is then opposite.Negative pool
It is laterally expanded in elastic range when pine stretches than concrete in tension, the transverse direction of material is shunk instead when compressed, is had
Effect resists shearing force, absorbs the external energy discharged significantly.Negative poisson's ratio material relies on its Negative poisson's ratio, has excellent
Elasticity modulus, break resistance and rebound toughness.The development of negative poisson's ratio material had more than 30 years, and application is concentrated mainly on
The fields such as foamed material, lumbar disc prosthesis material, artificial blood vessel's alternative materials.In field of explosion, once someone was by curtain design
Negative poisson's ratio is out to realize explosion-proof purpose.However, there is presently no the correlation reports of negative poisson's ratio concrete in building field
Road, being applied to anti-explosion engineering is even more to have never heard of.
To solve conventional concrete in the defect of explosion-proof aspect, the mesh for safely and effectively reducing loss caused by explosion is realized
, the concept that the present invention plans " Negative poisson's ratio " introduces concrete structure material field.It will be provided with the negative pool of explosion prevention function
Pine is applied to the industrial pipelines such as civilian, military building masonry wall or natural gas, petroleum than concrete, so that being subjected to blast load
When effect, wall or pipeline are shunk and unexpansive in the normal orientation of firing pulse.
Summary of the invention
For existing concrete at the problems of explosion-proof aspect, the present invention provides the porous explosion-proof coagulations of fiber reinforcement
Soil and preparation method thereof.The porous antiexplosive concrete of fiber reinforcement is designed by Negative poisson's ratio, can be effective against simultaneously
Blast load energy is absorbed, building structure and its internal personal safety as well as the property safety are protected to greatest extent to realize.
Technical solution of the present invention: the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, by containing connection
The enhancing of the fibre structure building unit of the celluar concrete matrix and several specific forms of pore structure or indent pore structure
Volume array composition；The fibre structure unit of the specific form is made of the layer 2-4 fiber hinge of parallel arrangement, and interlamellar spacing is
10mm-50mm, the fiber hinge are the axial symmetry polygonized structure with interior re-entrant angle.The fiber is that diameter is 0.05mm-
The polypropylene fibre of 5mm, steel fibre, stainless steel fibre, chrysotile asbestos fibre, green stone cotton fiber, iron-stone cotton fiber, alkali resistant glass fibers
Dimension, alkali resistant mineral wool fiber, polyethylene fibre, polypropylene fibre, vinal, nylon fiber, aromatic polyimide fibre,
One or more of sisal fiber or maguey.
Wherein, the axial symmetry polygonized structure is six rib concave inward structures, eight rib concave inward structures, ten rib concave inward structures or ten
Two rib concave inward structures；The six ribs concave inward structure is as shown in Figure 1a, and the eight ribs concave inward structure is as shown in Figure 1 b, in ten rib
As illustrated in figure 1 c, the 12 rib concave inward structure is as shown in Figure 1 d for recessed structure；The interior re-entrant angle is respectively β1=90 ° -150 °, β2
=100 ° -160 °, β3=110 ° -160 °, β4=110 ° -170 °, the circumscribed circle of the axial symmetry polygon of the fibre structure unit
Diameter is 9mm-54mm.
It is ordered arrangement between the fibre structure unit of several specific forms；The ordered arrangement is oriented and ordered
Closely spaced array (the special complete ordering arrangement fiber type concrete of concave inward structure), oriented and ordered interlayer array (special indent/common
Layer of structure replaces ordered arrangement fiber type concrete) or oriented and ordered interlayer intersection mosaic array (special indent/ordinary construction
ABA item inlays arrangement fiber type concrete), as shown in Figure 6.
Each fibre structure unit further includes the anchoring fiber beam of vertical direction, the plane of every layer of fiber hinge
With anchoring fiber Shu Chuizhi；The direction of the interior re-entrant angle is consistent with the direction of propagation of blast load.
Wherein, the celluar concrete matrix is prepared by following several components: cementitious material, water-reducing agent, exciting agent,
Foam stabilizer and foaming agent；According to parts by weight, the dosage of the foaming agent is the 3-14% of the cementitious material, the foam stabilizer
Weight ratio with foaming agent is 0.6-4.2.The cementitious material is gypsum, portland cement, the silicate cement for blending condensation material
One in mud, quick-hardening cement, expanding cement, self-stressing cement, magnesium phosphate cement, special silicate cement and sulfate-resistant cement
Kind is several；The foaming agent is hydrogen peroxide；The foam stabilizer is one in carboxymethyl cellulose, sodium cellulosate and calcium stearate
Kind is several；The exciting agent is the KMnO that mass fraction is 0.3-0.6%4Solution；The water-reducing agent is polycarboxylic-acid diminishing
Agent；According to parts by weight, the cementitious material is 280-320 parts；The KMnO4Solution is 0.5-1 parts, and the polycarboxylic-acid subtracts
Aqua is 0.5-0.7 parts.
The preparation method of explosion-proof fiber concrete with Negative poisson's ratio, the preparation method is that precast framework method,
The following steps are included: (1) prepares: according to the needs of fiber hinge, using routine techniques, the fiber for being 0.05mm-5mm by diameter
It is spun into diameter and is the fibre bundle of 1mm-20mm, and fibre bundle is bent, cutting process；(2) fixed: by the fiber of well cutting
Beam is fixed as the axial symmetry polygonized structure with interior re-entrant angle, then there is the axial symmetry polygonized structure of interior re-entrant angle to consolidate n-layer
Surely fibre structure unit is obtained, finally by fibre structure unit ordered arrangement, obtains prefibers stay in place form；(3) it pours: root
According to the proportion design mixed concrete of celluar concrete matrix, and it is poured into the prefibers structure mould of step (2) preparation
In plate, maintenance is stood, obtains that there is the porous antiexplosive concrete of the fiber reinforcement of Negative poisson's ratio.Arrow direction shown in fig. 5
For the loading direction of concrete structure load-bearing.
Wherein, when foam stabilizer is carboxymethyl cellulose or sodium cellulosate, mixed concrete described in step (3) include with
Lower step: (a) pouring into cementitious material in agitating device, stirs at low speed to uniformly mixed；It is then slowly added into suitable quantity of water, is continued
It stirs at low speed evenly dispersed in water to cementitious material；(b) water-reducing agent is added into agitating device, stirs at low speed 25-40s；(c)
Continue high-speed stirred 20-40s, and exciting agent and foam stabilizer is added in stirring；(d) switch to stir at low speed, and add in stirring
Enter foaming agent；Continue stirring 5-20s to start to foam.When foam stabilizer is calcium stearate, mixed concrete described in step (3)
In, foam stabilizer is added in agitating device in step (b).
Wherein, the revolving speed stirred at low speed is 30-100r/min, and the revolving speed of the high-speed stirred is 200-350r/
min；The weight ratio of the water and cementitious material is 0.5-0.6:1.When the explosion-proof celluar concrete has intercommunicating pore structure: pressing
Weight fraction meter, the foaming agent are the 8-14% of cementitious material；The revolving speed stirred at low speed described in step (d) is 30-70r/
min；It is cast in after foaming is completed and carries out described in step (3).The explosion-proof fiber celluar concrete has indent pore structure
When: score meter by weight, the foaming agent are the 3-8% of cementitious material；The revolving speed stirred at low speed described in step (d) is 50-
100r/min；It is cast in foaming described in step (3) and starts when progress；After the completion of pouring, in the 2/5-2/3 time of foaming stages
Apply external pressure, the external pressure is the 10-20% of the sample compression strength.It (is needed before preparation first to corresponding formula system
Foamed time and compression strength are measured)
It is optimized and to pore morphology and respective interface structure, so that concrete be made to imitate with negative poisson's ratio
It answers, improves concrete to the absorbability of blast load, and largely keep concrete after absorbing blast load
Original macrostructure is not destroyed.With with hole-closing structure general fibre enhance celluar concrete compared with, have intercommunicating pore and
The storage modulus of the porous antiexplosive concrete of the fiber reinforcement of indent pore structure greatly improves, and resistance is substantially improved and absorbs explosion load
The ability of lotus energy, avoid directly discharging in blast process explosion product building structure and its internal personal property are caused it is secondary
Injury protects building structure and its internal personal safety as well as the property safety to realize to greatest extent.
In order to obtain according to the Poisson's ratio of the explosion-proof fiber celluar concrete of above method preparation, the application uses following sides
Method detects test block.Attached drawing 7 is the experimental provision schematic diagram that detection uses.
(1) test method
Common test block is resisted referring to " standard for test methods of mechanical properties of ordinary concrete " (GB/T50081-2002)
The test of Compressive Strength.This kind of test block is tested using full-automatic pressure testing machine.
Inside the Pass referring to the phase in " normal concrete small hollow block mechanical property tests standard " (GB/T8239-1997)
Appearance is measured the compression strength of porous test block.
In order to accurately measure the consecutive variations situation of test block shape after the load that is under pressure, test uses the smallest load
Speed is loaded, and common test block loading speed is 0.1MPa/s, and porous test block loading speed is 0.2mm/min, and is being loaded
While, using the overall process of industrial camera shooting test block load, until there is macroscopic failure in test block.
(2) testing procedure
1. the test block of maintenance to stipulated time is taken out from fog room, put it into dry straight in electric drying oven with forced convection
It to constant weight, then takes out, is cooled to room temperature.
2. the test zone of test block surface (side) is uniformly sprayed first it is pitch-dark, then with the random sprinkling of white spray painting
On pitch-dark surface, as shown in Figure 8.The purpose handled in this way is for the ease of observation, to meet the needs of digital speckle method test.
3. it is to be painted parch after, test block is placed on the bearing plate of pressure testing machine, and guarantee bearing plate and test block
The center of compression face is overlapped.Compression set is as shown in Figure 9.
4. starting testing machine, lower platen is slowly risen, when test block is soon contacted with top board, adjustment knob is at a slow speed
Rise, to contact board uniformly with test block compression face.
5. test parameter is arranged, by workspace switching at upper space, maximum range 50KN, velocity of displacement 0.2mm/min.
Start to test after clearing, until test specimen generates macroscopic failure.And while loading procedure, continuously taken pictures with industrial camera, it is right
Each period that the test block of different moments is destroyed is recorded in real time.
6. data processing: carrying out correlation analysis using DSCM software (exploitation of engineering mechanics system of Tsinghua University).This method
Deficiency of the DSCM method fitted using related coefficient interpolation in terms of measuring big strain displacement field is largely compensated for,
Deformation of concrete sample in the case where uniaxial compression can be studied, and the variation of displacement field and strain field can be provided simultaneously.
As shown in Figure 10, common test block is non-porous test block, and the hole in closed pore test block is approximate regulation sphere, intercommunicating pore examination
Hole in block is connected to by internal void, and the hole of concave hole test block is to be squeezed in closed pore test block foaming by uniaxial pressure
Pressure forms or pre-buried prefabricated paraffin indent ghost body unit structure.
Beneficial effects of the present invention:
(1) the innovative fiber by way of designing fibre structure unit and in angle and concrete of the present invention
Structural unit and its stacked array distribution, obtain the prefibers stay in place form with specific form；Then precast framework is used
Method, preparation have the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio.
(2) concrete substrate of the invention is the celluar concrete with intercommunicating pore structure or indent pore structure, the two
Poisson ratio minimum respectively reaches -0.21 and -0.90, compared with the common porous fiber concrete with hole-closing structure,
261% and 372% is respectively increased in storage modulus；Resistance is substantially improved and absorbs the ability of blast load energy, avoids exploding
Explosion product is directly discharged in journey, secondary injury is caused to building structure and its internal personal property, to realize to building structure
And its internal personal safety as well as the property safety is protected to greatest extent.
(3) present invention is by the celluar concrete matrix with Negative poisson's ratio and with the special form of Negative poisson's ratio
State fibre structure unit combines so that the Poisson ratio minimum of original celluar concrete matrix respectively reach -0.53 with -
0.98,320% and 418% is respectively increased in storage modulus；The absorbability to blast load is improved by a larger margin, and very big
Original structure is kept not to be destroyed in degree.
Detailed description of the invention
Fig. 1 is the fiber hinge arrangement figure for having Negative poisson's ratio in the present invention, and Fig. 1 a is six rib concave inward structures, Fig. 1 b
It is ten rib concave inward structures for eight rib concave inward structures, Fig. 1 c, Fig. 1 d is 12 rib concave inward structures.
Fig. 2 be six rib concave inward structures, eight rib concave inward structures fiber hinge Impact direction schematic diagram.
Fig. 3 is the schematic diagram of the shrinkage direction after fiber hinge stress shown in Fig. 2.
Fig. 4 is the fibre structure cell schematics using different fiber hinge arrangements；Fig. 4 a is general fibre structure, Fig. 4 b
For six rib concave inward structures, Fig. 4 c is eight rib concave inward structures.
Fig. 5 is the perspective view using the fiber concrete test block of different fiber hinge arrangements；Fig. 5 a is ordinary mortar
Concrete, Fig. 5 b are general fibre concrete, and Fig. 5 c is six rib indent fiber concretes；Fig. 5 d is eight rib indent fiber coagulations
Soil.
Fig. 6 is the schematic diagram of three kinds of ordered arrangements of fibre structure unit；Fig. 6 a is oriented and ordered closely spaced array, Fig. 6 b
For oriented and ordered interlayer array, Fig. 6 c is that oriented and ordered interlayer intersects mosaic array.
Fig. 7 is the experimental provision schematic diagram that Poisson's ratio detection uses.
Fig. 8 is the sample schematic diagram in Poisson's ratio detection.
Fig. 9 is the compression set schematic diagram in Poisson's ratio detection.
Figure 10 is fiber multihole concrete test block profile morphology schematic diagram.
Specific embodiment
The present invention will be further explained with reference to the examples below.
Embodiment 1: have intercommunicating pore structure and the six oriented and ordered closely spaced array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
The porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, the porous antiexplosive concrete of fiber reinforcement by
The celluar concrete matrix and several specific form fibre structure units composition for having intercommunicating pore structure；The fiber knot
For structure unit by being made of 2 layers of fiber hinge of parallel arrangement, the fiber hinge is six rib concave inward structures；The interior re-entrant angle is β1
=90 °, interlamellar spacing 15mm, the circumscribed circle diameter of six-edged axis symmetric polygonal is 24mm, and the fiber is that diameter is 0.2mm's
The diameter that steel fibre is spun into is the fibre bundle of 5mm.Each fibre structure unit further includes the anchoring fiber beam of vertical direction,
The plane and anchoring fiber Shu Chuizhi of every layer of fiber hinge；The direction of the interior re-entrant angle and the direction of propagation one of blast load
It causes.Forming between the multiple fibre structure unit of explosion-proof fiber concrete is oriented and ordered closely spaced array (special indent knot
Structure is complete ordering arrangement fiber type concrete), as shown in Figure 6 a.
Wherein, the celluar concrete matrix is prepared by following several components: cementitious material, water-reducing agent, exciting agent,
Foam stabilizer and foaming agent.Wherein, the cementitious material is portland cement, and the foaming agent is hydrogen peroxide, and the foam stabilizer is
Carboxymethyl cellulose, the exciting agent are the KMnO that mass fraction is 0.3%4Solution, the water-reducing agent are polycarboxylic-acid diminishing
Agent.According to parts by weight, the cementitious material is 300g, hydrogen peroxide 30g, carboxymethyl cellulose 35g, and mass fraction is
0.3% KMnO4Solution is 0.8g, and the poly carboxylic acid series water reducer is 0.6g.
The preparation method of the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, the preparation method is that prefabricated
Skeleton method, comprising the following steps: (1) prepare: being 0.2mm by diameter using conventional spinning techniques according to the needs of fiber hinge
The diameter that is spun into of steel fibre be the fibre bundle of 5mm, and be bent and cut；(2) fixed: the fiber of well cutting is fixed as
Then six-edged axis symmetric polygonal structure with interior re-entrant angle is consolidated 2 layers of six-edged axis symmetric polygonal structure with interior re-entrant angle
Surely fibre structure unit is obtained, finally by fibre structure unit ordered arrangement, obtains prefibers stay in place form；(3) it pours: root
According to the proportion design mixed concrete of celluar concrete matrix, and it is poured into the prefibers structure mould of step (2) preparation
In plate, maintenance is stood, the explosion-proof fiber concrete with Negative poisson's ratio is obtained.Arrow direction shown in fig. 5 is concrete
The loading direction of structure load-bearing.
Wherein, mixed concrete described in step (3) is the following steps are included: (a) pours into cementitious material in agitating device,
About 1min is stirred at low speed, makes to be uniformly mixed；It is then slowly added into suitable quantity of water, continues to stir at low speed 30s, divides cementitious material uniformly
It dissipates in water；(b) water-reducing agent is added into agitating device, stirs at low speed 25s；(c) continue high-speed stirred 20s, and in stirring
Exciting agent and foam stabilizer is added；(d) switch to stir at low speed, and foaming agent is added in stirring；Continue stirring 10s to start to foam,
After-pouring is completed in foaming.Wherein, the revolving speed stirred at low speed is 50r/min, and the revolving speed of high-speed stirred is 300r/min；Step (a)
The weight ratio of middle water and cementitious material is 0.5:1.
In order to obtain according to the Poisson's ratio of the explosion-proof celluar concrete of above method preparation, the application uses following methods pair
Test block is detected.Attached drawing 7 is the experimental provision schematic diagram that detection uses.
(1) test method
Common test block is resisted referring to " standard for test methods of mechanical properties of ordinary concrete " (GB/T50081-2002)
The test of Compressive Strength.This kind of test block is tested using full-automatic pressure testing machine.
Inside the Pass referring to the phase in " normal concrete small hollow block mechanical property tests standard " (GB/T8239-1997)
Appearance is measured the compression strength of porous test block.
In order to accurately measure the consecutive variations situation of test block shape after the load that is under pressure, test uses the smallest load
Speed is loaded, and common test block loading speed is 0.1MPa/s, and porous test block loading speed is 0.2mm/min, and is being loaded
While, using the overall process of industrial camera shooting test block load, until there is macroscopic failure in test block.
(2) testing procedure
1. the test block of maintenance to stipulated time is taken out from fog room, put it into dry straight in electric drying oven with forced convection
It to constant weight, then takes out, is cooled to room temperature.
2. the test zone of test block surface (side) is uniformly sprayed first it is pitch-dark, then with the random sprinkling of white spray painting
On pitch-dark surface, as shown in Fig. 8.The purpose handled in this way is for the ease of observation, to meet the need of digital speckle method test
It wants.
3. it is to be painted parch after, test block is placed on the bearing plate of pressure testing machine, and guarantee bearing plate and test block
The center of compression face is overlapped.Compression set is as shown in Fig. 9.
4. starting testing machine, lower platen is slowly risen, when test block is soon contacted with top board, adjustment knob is at a slow speed
Rise, to contact board uniformly with test block compression face.
5. test parameter is arranged, by workspace switching at upper space, maximum range 50KN, velocity of displacement 0.2mm/min.
Start to test after clearing, until test specimen generates macroscopic failure.And while loading procedure, continuously taken pictures with industrial camera, it is right
Each period that the test block of different moments is destroyed is recorded in real time.
6. data processing: carrying out correlation analysis using DSCM software (exploitation of engineering mechanics system of Tsinghua University).This method
Deficiency of the DSCM method fitted using related coefficient interpolation in terms of measuring big strain displacement field is largely compensated for,
Deformation of concrete sample in the case where uniaxial compression can be studied, and the variation of displacement field and strain field can be provided simultaneously.
It is calculated according to above-mentioned testing result, the fiber reinforcement manufactured in the present embodiment for having intercommunicating pore structure is porous anti-
The Poisson's ratio of quick-fried concrete is -0.44.
Embodiment 2: have intercommunicating pore structure and the six oriented and ordered interlayer array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
Unlike the first embodiment, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 3 layers of fiber hinge of parallel arrangement, and the interior re-entrant angle is β1=120 °, interlamellar spacing 20mm, six-edged axis pair
The circumscribed circle diameter of polygon is referred to as 20mm, and the fiber is the fiber that the diameter that the steel fibre that diameter is 0.1mm is spun into is 4mm
Beam.Forming between the multiple fibre structure unit of explosion-proof fiber concrete is oriented and ordered interlayer array (special indent/general
Logical layer of structure replaces ordered arrangement fiber type concrete), as shown in Figure 6 b.The cementitious material is portland cement, described
Foam stabilizer is in calcium stearate.According to parts by weight, the cementitious material is 280g, hydrogen peroxide 22.4g, and calcium stearate is
25g；The KMnO that the mass fraction is 0.6%4Solution is 0.5g, and the poly carboxylic acid series water reducer is 0.5g.
Wherein, the preparation method of the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, described in step (3)
Mixed concrete are as follows: the revolving speed stirred at low speed is 70r/min, and the revolving speed of high-speed stirred is 250r/min；Step (1) Zhong Shui and glue
The weight ratio of gel material is 0.6:1.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having intercommunicating pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.49.
Embodiment 3: have intercommunicating pore structure with the six oriented and ordered interlayers of rib indent fibre structure unit and intersect mosaic array
The porous antiexplosive concrete of the fiber reinforcement of reinforcement
Unlike the first embodiment, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 4 layers of fiber hinge of parallel arrangement, and the interior re-entrant angle is β1=150 °, interlamellar spacing 30mm, six-edged axis pair
The circumscribed circle diameter of polygon is referred to as 50mm, and the fiber is the fiber that the diameter that the steel fibre that diameter is 0.6mm is spun into is 6mm
Beam.Form between the multiple fibre structure unit of explosion-proof fiber concrete is that oriented and ordered interlayer intersects mosaic array (spy
Different indent/ordinary construction ABA item inlays arrangement fiber type concrete), as fig. 6 c.The cementitious material is expanding cement,
The foam stabilizer sodium cellulosate.According to parts by weight, the cementitious material is 320g；Hydrogen peroxide is 41.6g, and sodium cellulosate is
40g, the KMnO that the mass fraction is 0.5%4Solution is 1g, and the poly carboxylic acid series water reducer is 0.7g.
Wherein, the preparation method of the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, described in step (3)
Mixed concrete are as follows: the revolving speed stirred at low speed is 30r/min, and the revolving speed of high-speed stirred is 350r/min；Step (1) Zhong Shui and glue
The weight ratio of gel material is 0.55:1.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having intercommunicating pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.51.
Embodiment 4: have indent pore structure with the eight oriented and ordered interlayers of rib indent fibre structure unit and intersect mosaic array
The porous antiexplosive concrete of the fiber reinforcement of reinforcement
Unlike the first embodiment, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 3 layers of fiber hinge of parallel arrangement, and the fiber hinge is eight rib concave inward structures；The indent angle beta2=
100 °, interlamellar spacing 20mm, the circumscribed circle diameter of eight rib axial symmetry polygons is 40mm, and the fiber is that diameter is 0.1mm's
The diameter that steel fibre is spun into is the fibre bundle of 5mm.The ordered arrangement is that oriented and ordered interlayer intersects mosaic array (in special
Recessed/ordinary construction ABA item inlays arrangement fiber type concrete), as fig. 6 c.The cementitious material is quick-hardening cement, described
Foam stabilizer is carboxymethyl cellulose.According to parts by weight, the cementitious material is 300g；Hydrogen peroxide is 18g, the carboxylic in foam stabilizer
Methylcellulose is 18g, the KMnO that the mass fraction is 0.5%4Solution is 0.6g, and the poly carboxylic acid series water reducer is
0.6g。
Wherein, the preparation method of the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio,
Mixed concrete described in step (3) are as follows: the revolving speed stirred at low speed is 80r/min, and the revolving speed of high-speed stirred is
250r/min；The weight ratio of water and cementitious material is 0.5:1 in step (a).It pours, foams when foaming and starting in step (d)
Apply the external pressure of 2.6MPa when 15s.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.74.
Embodiment 5: have indent pore structure and the eight oriented and ordered interlayer array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
As different from Example 4, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 2 layers of fiber hinge of parallel arrangement, the indent angle beta2=120 °, interlamellar spacing 10mm, eight rib axial symmetry
The circumscribed circle diameter of polygon is 30mm, and the fiber is the fiber that the diameter that the steel fibre that diameter is 0.2mm is spun into is 4mm
Beam.The ordered arrangement is that (special indent/ordinary construction level replaces ordered arrangement fiber type coagulation to oriented and ordered interlayer array
Soil), as shown in Figure 6 b.The cementitious material is sulfate-resistant cement, and the foam stabilizer is calcium stearate.According to parts by weight,
The cementitious material is 290g, hydrogen peroxide 10.4g, calcium stearate 15g；The KMnO that the mass fraction is 0.3%4Solution
For 0.9g, the poly carboxylic acid series water reducer is 0.5g.
Wherein, the preparation method of the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, described in step (3)
Mixed concrete are as follows: the revolving speed stirred at low speed is 50r/min, and the revolving speed of high-speed stirred is 200r/min；Step (1) Zhong Shui and glue
The weight ratio of gel material is 0.6:1.Apply the external pressure of 2.2MPa in step (4) when foaming 20s.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.85.
Embodiment 6: have indent pore structure and the eight oriented and ordered interlayer array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
As different from Example 4, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 2 layers of fiber hinge of parallel arrangement, the indent angle beta2=150 °, interlamellar spacing 15mm, eight rib axial symmetry
The circumscribed circle diameter of polygon is 45mm, and the fiber is the fiber that the diameter that the steel fibre that diameter is 0.3mm is spun into is 3mm
Beam.The ordered arrangement is that (special indent/ordinary construction level replaces ordered arrangement fiber type coagulation to oriented and ordered interlayer array
Soil), as fig. 6 c.The cementitious material portland cement, the foam stabilizer are sodium cellulosate.According to parts by weight, described
Cementitious material is 310g, hydrogen peroxide 24.8g, sodium cellulosate 24g, the KMnO that the mass fraction is 0.4%4Solution is
0.7g, the poly carboxylic acid series water reducer are 0.7g.
Wherein, the preparation method of the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, described in step (3)
Mixed concrete are as follows: the revolving speed stirred at low speed is 50r/min, and the revolving speed of high-speed stirred is 200r/min；Step (1) Zhong Shui and glue
The weight ratio of gel material is 0.6:1.Apply the external pressure of 2.7MPa in step (4) when foaming 14s.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.93.
Embodiment 7: have intercommunicating pore structure and the eight oriented and ordered closely spaced array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
Unlike the first embodiment, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 4 layers of fiber hinge of parallel arrangement, the indent angle beta2=160 °, interlamellar spacing 15mm, eight rib axial symmetry
The circumscribed circle diameter of polygon is 50mm, and the fiber is the fiber that the diameter that the steel fibre that diameter is 0.4mm is spun into is 4mm
Beam.The ordered arrangement is oriented and ordered closely spaced array (the special complete ordering arrangement fiber type concrete of concave inward structure), is such as schemed
Shown in 6a.The cementitious material is portland cement, and the foam stabilizer is carboxymethyl cellulose.According to parts by weight, the glue
Gel material is 300g, hydrogen peroxide 27g, carboxymethyl cellulose 29g, the KMnO that the mass fraction is 0.6%4Solution is
0.6g, the poly carboxylic acid series water reducer are 0.6g.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having interior connectivity structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.51.
Embodiment 8: have intercommunicating pore structure and the ten oriented and ordered closely spaced array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
As different from Example 7, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 2 layers of fiber hinge of parallel arrangement, and the fiber hinge is the ten rib concave inward structures with interior re-entrant angle；It is described
Indent angle beta3=130 °, interlamellar spacing 12mm, the circumscribed circle diameter of ten rib axial symmetry polygons is 38mm, and the fiber is diameter
The fibre bundle that the diameter being spun into for the steel fibre of 0.1mm is 2mm.The ordered arrangement is oriented and ordered closely spaced array (in special
The recessed complete ordering arrangement fiber type concrete of structure), as shown in Figure 6 a.The cementitious material portland cement, the foam stabilizer
For calcium stearate.According to parts by weight, the cementitious material is 280g, hydrogen peroxide 14g, calcium stearate 15g, mass fraction
For 0.3% KMnO4Solution is 0.7g, and the poly carboxylic acid series water reducer is 0.5g.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having intercommunicating pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.45.
Embodiment 9: have intercommunicating pore structure and the ten oriented and ordered interlayer array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
As different from Example 7, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 3 layers of fiber hinge of parallel arrangement, the indent angle beta3=135 °, interlamellar spacing 12mm, ten rib axial symmetry
The circumscribed circle diameter of polygon is 38mm, and the fiber is the fiber that the diameter that the steel fibre that diameter is 0.1mm is spun into is 2mm
Beam.The ordered arrangement is that (special indent/ordinary construction level replaces ordered arrangement fiber type coagulation to oriented and ordered interlayer array
Soil), as shown in Figure 6 b.The cementitious material is portland cement, and the foam stabilizer is sodium cellulosate.According to parts by weight, institute
Stating cementitious material is 320g, hydrogen peroxide 35.2g, sodium cellulosate 32g, the KMnO that mass fraction is 0.4%4Solution is
0.8g, the poly carboxylic acid series water reducer are 0.7g.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.42.
Embodiment 10: have intercommunicating pore structure and the ten oriented and ordered interlayer array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
As different from Example 8, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 4 layers of fiber hinge of parallel arrangement, the indent angle beta3=160 °.The ordered arrangement be it is oriented and ordered every
Layer array (special indent/ordinary construction level replaces ordered arrangement fiber type concrete), as shown in Figure 6 b.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.46.
Embodiment 11: have intercommunicating pore structure and the 12 oriented and ordered interlayer array reinforcements of rib indent fibre structure unit
The porous antiexplosive concrete of fiber reinforcement
Unlike the first embodiment, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber knot
Structure unit is made of 3 layers of fiber hinge of parallel arrangement, and the fiber hinge is 12 rib concave inward structures；The indent angle beta4=
110°.The ordered arrangement is oriented and ordered interlayer array, as shown in Figure 6 b.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.48.
Embodiment 12: have intercommunicating pore structure and intersect with the 12 oriented and ordered interlayers of rib indent fibre structure unit and inlay battle array
The porous antiexplosive concrete of the fiber reinforcement of column reinforcement
As different from Example 11, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber
Structural unit is made of 4 layers of fiber hinge of parallel arrangement, and the interior re-entrant angle is β4=140 °.The ordered arrangement is that orientation has
Sequence interlayer intersects mosaic array, as fig. 6 c.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.52.
Embodiment 13: have intercommunicating pore structure and intersect with the 12 oriented and ordered interlayers of rib indent fibre structure unit and inlay battle array
The porous antiexplosive concrete of the fiber reinforcement of column reinforcement
As different from Example 11, with the porous antiexplosive concrete of fiber reinforcement of Negative poisson's ratio, the fiber
Structural unit is made of 2 layers of fiber hinge of parallel arrangement, and the interior re-entrant angle is β4=170 °.The ordered arrangement is that orientation has
Sequence interlayer intersects mosaic array, as fig. 6 c.
It is calculated according to testing result, the fiber reinforcement manufactured in the present embodiment for having indent pore structure is porous explosion-proof mixed
The Poisson's ratio for coagulating soil is -0.51.
The raw material specification used in the above embodiment of the present invention is as follows:
Raw material specification product code numbering manufacturer
Hydrogen peroxide analyzes the Yantai pure GB/T 6684-2002 three and chemical reagent Co., Ltd
Potassium permanganate analyzes the pure Yantai GB/643-2008 three and chemical reagent Co., Ltd
Carboxymethyl cellulose analyzes the Tianjin pure Q/HG 34351-99 Yong great chemical reagent Co., Ltd
Sodium carboxymethylcellulose analyzes the pure Shanghai GB/1904-2005 Shen optical eclipse Chemical Company
The calcium stearate chemistry pure Tianjin Q/12HB3780-2004 Ke Miou chemical reagent Co., Ltd
Cementitious material Shandong scenery with hills and waters Cement Co., Ltd
Polycarboxylate water-reducer analyzes the pure Shandong BKS-199 Bock chemistry limited liability company
Pacify metal product Co., Ltd in steel fibre Tangshan hundred million.
Claims (9)
1. the porous antiexplosive concrete of fiber reinforcement with Negative poisson's ratio, it is characterised in that: the fiber reinforcement is porous anti-
Quick-fried concrete includes the fibre with the celluar concrete substrate and several specific forms of intercommunicating pore structure or indent pore structure
Tie up the enhancing volume array of structural unit building；The fibre structure unit is made of the layer 2-4 fiber hinge of parallel arrangement, interlayer
Away from for 10mm-50mm, the fiber hinge is the axial symmetry polygonized structure with interior re-entrant angle；
The axial symmetry polygonized structure is six rib concave inward structures, eight rib concave inward structures, ten rib concave inward structures or 12 rib indents
Structure；The interior re-entrant angle of the six ribs concave inward structure is β1, the interior re-entrant angle of the eight ribs concave inward structure is β2, the ten ribs indent knot
The interior re-entrant angle of structure is β3, the interior re-entrant angle of the 12 rib concave inward structure is β4；The interior re-entrant angle is respectively β1=90 ° -150 °, β2
=100 ° -160 °, β3=110 ° -160 °, β4=110 ° -170 °, the circumscribed circle diameter of the axial symmetry polygon is 9mm-
54mm。
2. the porous antiexplosive concrete of the fiber reinforcement according to claim 1 with Negative poisson's ratio, it is characterised in that:
It is ordered arrangement between the multiple fibre structure unit；The ordered arrangement be oriented and ordered closely spaced array, it is oriented and ordered every
Layer array or oriented and ordered interlayer intersect mosaic array.
3. the porous antiexplosive concrete of the fiber reinforcement according to claim 1 with Negative poisson's ratio, it is characterised in that:
Each fibre structure unit further includes the anchoring fiber beam of vertical direction, the plane of every layer of fiber hinge and fixed fibre
Tie up Shu Chuizhi；The direction of the interior re-entrant angle is consistent with the direction of propagation of blast load.
4. the porous antiexplosive concrete of the fiber reinforcement according to claim 1 or 2 with Negative poisson's ratio, feature exist
In: the celluar concrete substrate is prepared by following several components: cementitious material, water-reducing agent, exciting agent, foam stabilizer and hair
Infusion；According to parts by weight, the dosage of the foaming agent is the 3-14% of the cementitious material, the foam stabilizer and foaming agent
Weight ratio is 0.6-4.2.
5. the porous antiexplosive concrete of the fiber reinforcement according to claim 4 with Negative poisson's ratio, it is characterised in that:
The cementitious material is gypsum, portland cement, portland cement, quick-hardening cement, expanding cement, the seif-citing rate for blending condensation material
One or more of cement, magnesium phosphate cement and sulfate-resistant cement；The foaming agent is hydrogen peroxide；The foam stabilizer is carboxylic
One or more of methylcellulose, sodium cellulosate and calcium stearate；The exciting agent is that mass fraction is 0.3-0.6%'s
KMnO4Solution；The water-reducing agent is poly carboxylic acid series water reducer；
According to parts by weight, the cementitious material is 280-320 parts；The KMnO4Solution is 0.5-1 parts, and the polycarboxylic-acid subtracts
Aqua is 0.5-0.7 parts.
6. the porous antiexplosive concrete of the fiber reinforcement according to claim 5 with Negative poisson's ratio, it is characterised in that:
The fiber is one of steel fibre, alkali resistant glass fiber and aromatic polyimide fibre that diameter is 0.05mm-5mm or several
Kind.
7. the preparation method of the porous antiexplosive concrete of the fiber reinforcement with Negative poisson's ratio as described in 1-6 any one,
It is characterized by: the preparation method is that precast framework method, comprising the following steps: (1) prepare: according to the needs of fiber hinge,
Fiber is spun into diameter and is the fibre bundle of 1mm-20mm, and fibre bundle is bent, cutting process；(2) fixed: by well cutting
Fibre bundle be fixed as the axial symmetry polygonized structure with interior re-entrant angle, then by layer 2-4 have interior re-entrant angle axial symmetry it is polygon
The fixation of shape structure obtains fibre structure unit, finally by fibre structure unit ordered arrangement, obtains prefibers stay in place form；
(3) it pours: according to the proportion design mixed concrete of celluar concrete substrate, and being poured into the prefabricated of step (2) preparation
In fibre structure template, maintenance is stood, obtains that there is the porous antiexplosive concrete of the fiber reinforcement of Negative poisson's ratio.
8. the preparation method of the porous antiexplosive concrete of the fiber reinforcement according to claim 7 with Negative poisson's ratio,
It is characterized by: mixed concrete described in step (3) includes following when foam stabilizer is carboxymethyl cellulose or sodium cellulosate
Step: (a) pouring into cementitious material in agitating device, stirs at low speed to uniformly mixed；It is then slowly added into suitable quantity of water, is continued low
Speed stirring is evenly dispersed in water to cementitious material；(b) water-reducing agent is added into agitating device, stirs at low speed 25-40s；(c) after
Continuous high-speed stirred 20-40s, and exciting agent and foam stabilizer is added in stirring；(d) switch to stir at low speed, and be added in stirring
Foaming agent；Continue stirring 5-20s to start to foam；
When foam stabilizer is calcium stearate, in mixed concrete described in step (3), stirring is added in foam stabilizer in step (b)
In device；
The revolving speed stirred at low speed is 30-100r/min, and the revolving speed of the high-speed stirred is 200-350r/min；The water with
The weight ratio of cementitious material is 0.5-0.6:1.
9. the preparation method of the porous antiexplosive concrete of the fiber reinforcement according to claim 8 with Negative poisson's ratio,
It is characterized by: when the explosion-proof celluar concrete has intercommunicating pore structure: score meter by weight, the foaming agent are gelling material
The 8-14% of material；The revolving speed stirred at low speed described in step (d) is 30-70r/min；It is cast in and has foamed described in step (3)
It is carried out at later；
When the explosion-proof celluar concrete has indent pore structure: score meter by weight, the foaming agent are the 3- of cementitious material
8%；The revolving speed stirred at low speed described in step (d) is 50-100r/min；Be cast in described in step (3) foaming start when into
Row；It after the completion of pouring, is pressed outside the 2/5-2/3 time of foaming stages applies, the external pressure is the sample compression strength
10-20%.
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| CN109408964A (en) * | 2018-10-26 | 2019-03-01 | 中国建筑股份有限公司 | A kind of fiber hinge analogy method of post-tensioned prestressing prefabricated concrete structure node |
| CN111003959B (en) * | 2019-10-25 | 2020-11-24 | 青岛理工大学 | Anti-knock and anti-impact multi-stage heterogeneous fiber prefabricated body composite concrete and preparation method thereof |
| CN112010670A (en) * | 2020-07-31 | 2020-12-01 | 许言言 | Prefabricated material and preparation method thereof, prefabricated product and construction process |
| CN112813881B (en) * | 2020-12-30 | 2022-06-14 | 山东大学 | Cement-based composite material with negative Poisson's ratio characteristic, method and application |
| CN113816676B (en) * | 2021-09-06 | 2022-05-31 | 青岛理工大学 | Negative Poisson's ratio cement-based composite material and preparation method thereof |
| US11873637B2 (en) | 2022-02-15 | 2024-01-16 | Joon Bu Park | Bricks exhibiting negative Poisson's ratio |
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