CN1385394A - Fibre anti-permeation cracking-resistant concrete - Google Patents
Fibre anti-permeation cracking-resistant concrete Download PDFInfo
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- CN1385394A CN1385394A CN01140233A CN01140233A CN1385394A CN 1385394 A CN1385394 A CN 1385394A CN 01140233 A CN01140233 A CN 01140233A CN 01140233 A CN01140233 A CN 01140233A CN 1385394 A CN1385394 A CN 1385394A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a fibre impervious crack-resisting concrete, and its ingredients and admixing quantities are: 1. general Portland cement; (2). medium sand; (3) stone; (4) water-reducing agent; (5) slag powder, internal admixing quantity is 5%-50%, optimum admixing quantity is 20%-30%; (6) flyash, internal admixing quantity is 5%-50%, optimum admixing quantity is 40%-50%; (7) water-proofing agent, internal admixing quantity is 0.5%-5.0%, optimum admixing quantity is 2.5%; (8) expansion agent UEA, internal admixing quantity is 6%-12%, optimum admixing quantity is 8%-10%, one selected from water-proofing agent and expansion agent can be admixed; and (9) polypropylene fibre, external admixing quantity is 0.1-2.0 kg/cu.m, optimum admixing quantity is 1Kg/cu.m.
Description
The present invention relates to a kind of special concrete, particularly a kind of anti-permeation cracking-resistant concrete that is suitable for premixing, pumping.
Public utilities such as domestic and international at present many large bridges of building, river dyke, large-scale stadium, appearance textural defect cracks more or less all, the position that has has extended to the reinforcing bar position, and the globality of concrete structure is damaged, and seepage appears in dykes and dams, the vault infiltration becomes tide, the security of bridge is under suspicion, and final dismounting reconstruction, and many public places are forced to close, cause the lot of manpower and material resources waste, people's the security of the lives and property is subjected to serious threat.Tracing it to its cause, mainly is because concrete internal stress in the process of using is concentrated, and make inside exist the position of textural defect to produce tiny crack, and the final bigger crack that forms is extended in expansion gradually.Along with these fissured generation and expansion, the carbonization gradually of its top layer when progress of fracture during to reinforcing bar, is concretely protected the muscle effect and is completely lost, airborne corrosive gases is directly encroached on reinforcing bar and is caused steel bar corrosion, causes the final complete failure of destruction of skeleton construction.The prevention distress in concrete is mainly taked following two kinds of modes both at home and abroad at present:
1, adopts the method for admixture swelling agent.For being in wet environment and subterranean concrete works, swimming pool and water works, realized basically after using admixture swelling agent concrete, not ftractureing, non-leakage, guaranteed the normal use of these concrete structures.But for most of open-air work, bridge particularly, the top board of large-scale stadium and roof truss, the ground of big area utilities building, concrete structures such as airstrip, the admixture swelling agent not only can not play the effect of anticracking, and in use rimose is more serious, trace it to its cause, be because the aquation of swelling agent and the formation of hydrated product, must under the condition of full water, carry out, in case surrounding environment moisture deficiency, swelling agent not only can not play the effect of expansion cracking resistance, and because the swelling agent aquation also will be fought for originally few moisture, inside concrete produces capillary force, cause concrete shrinkage, form crackle.
2, adopt the method for admixture traditional fibre to improve concrete performance.The fiber of tradition admixture has three kinds of glass fibre, organic vegetable fibre and steel fibers, from result of use, adopts glass reinforced concrete glass mainly to use the glass fiber reinforced cement goods, and the Ca (OH) in the cement stone liquid phase
2Can make the siloxane bond of glass fibre rupture SiO
2With Ca (OH)
2Reacting generates the hydrated calcium silicate of low calcium, and this kind reaction can proceed to the SiO in the glass
2Till the completely consumed, thereby the tensile strength of glass fibre reduces greatly, makes concrete performance degradation, therefore can not large-scale application construct in the thing in concrete construction.Adopt the concrete of organic vegetable fibre because Fibre diameter is bigger, and intensity is lower, and is relatively poor with cement based consolidating material effect, therefore do not have large-scale promotion to use.The concrete of employing steel fiber has effectively prevented the appearance of distress in concrete.But the price that it is expensive, complicated operations technology make its range of application only limit to the on-the-spot special concrete that stirs or particular requirement is arranged, and can not big area promote the use of.More than three kinds of fibers can not large-scale application in the ready mixed concrete field Another reason be exactly that the concrete slump loss of these several fibers of admixture is big, divergence is little, workability is poor, is unfavorable for long-distance transportation and pumping construction.Deficiency at expansion anticracking and traditional fibre Bracking-resistant method, studied again both at home and abroad and adopted the synthon concrete batching to prevent the appearance of distress in concrete, but it is big to be applied in the ready mixed concrete slump-loss, divergence is little, pump-conveying property is poor, does not widely apply in the ready mixed concrete industry.Engineering circle generally believes that polypropylene fibre is a kind of low elastic modulus fiber, and volume is few, to concrete ultimate compression strength, and folding strength, the tensile strength influence is less, can not be as a kind of structure properties strongthener.
The purpose of this invention is to provide a kind of fibre anti-permeation cracking-resistant concrete that is suitable for premixing, pumping, eliminate distress in concrete from the source, solve the crack problem that concrete occurs in hydration and hardening and use, improve globality, stability, the security of concrete structure, improve concrete weather resistance and anti-crack and anti-seepage function, improve the work-ing life of buildings.
Technical scheme of the present invention:
Fibre anti-permeation cracking-resistant concrete is characterized in that: its component and addition content are
(1) ordinary Portland cement;
(2) medium sand;
(3) stone;
(4) water reducer;
(5) slag powders: in mix specific surface area 400 ± 20m2/Kg slag powders, volume is pressed 5%～50% of cement weight, the optimum mix amount 20%-30%;
(6) in the flyash volume by 5%～50% of cement weight, the optimum mix amount 40%～50%;
(7) in the water-resisting agent volume by 0.5%～5.0% of cement weight, the optimum mix amount 2.5%;
(8) volume is by 6%～12% of cement weight in the swelling agent UEA, and its best volume is 8%-10%;
(9) volume of poly-third fiber is the outer 0.1kg/m that mixes by gelling material weight
3-2.0kg/m
3, the optimum mix amount is 1kg/m
3
Above-mentioned polypropylene fibre is modification bundle fiber, netted staple fibre, monofilament shape fiber or durafiber.
Above-mentioned water-resisting agent and swelling agent can be selected an admixture.
Anti-permeation cracking-resistant principle and advantage of the present invention:
Polypropylene fibre is met and to be the netted or monofilament of individual layer after water stirs disorderly to uniform distribution, just as in concrete, having mixed the fine ribs of enormous quantity, can bond bonding cement and gather materials, suppress crack on concrete, the crack is taken place and developed effect of contraction, improve toughness, reduce the stress concentration factor of internal fissure end, prevent and control fissured appearance, bigger with the contact surface of concrete each component, it is good to have dispersing property, price is low, thoroughly having eliminated traditional fibre costs an arm and a leg, the alkalinity height, with cement-bonded weak effect, macrofiber is thicker, and be unfavorable for defectives such as pumping, make the slump-loss of ready mixed concrete of adding of fiber little, divergence is big, serviceability is good, and these all help fibre anti-permeation cracking-resistant concrete pumping construction and production in enormous quantities.Folk prescription concrete cost only increases by 32 yuan/m than normal concrete
3Effect of anti-cracking, the scope of application are obviously improved and are increased, and can save 3～5 yuan/m of labour cost in the construction and maintenance
3
Add swelling agent UEA, improved the anti-permeation cracking-resistant ability of concrete under wet environment.Support under the condition at mark, because competent moisture is arranged, the expansion performance, concrete shrinkage is little, but concrete shrinkage meets or exceeds the concrete of not mixing swelling agent under dry environment.Therefore, adopt swelling agent can play expansion compensation contraction, the effect of seepage control and crack resistance to being in the fibrous concrete of working in underground or the wet environment.
Add water-resisting agent and improve concrete water-proofing anticracking function, the concrete works that waterproof requirement is arranged for underground and ground, can increase concrete structure degree of compactness, prevent free water and combination water in the decomposition of inside concrete, mobile, evaporation, thereby effectively prevented the generation of concrete brittle crack.Effective enforcement of this cracking resistance measure has been crossed over swelling agent and only has been applicable to underground and the obstacle wet environment use range, makes the rigidity anticracking expand whole concrete works to by underground and wet environment.Adopting the measure of admixture water-resisting agent is the ability of guaranteeing all to have at the fibrous concrete of wet environment and dry environment water-proofing anticracking.
Add high efficiency water reducing agent, improved the concrete construction performance, improved weather resistance, played the effect of lubricating oil, be convenient to the concrete pumping construction, eliminated the traditional fibre concrete and only be applicable to on-the-spot the stirring, deficiency that can't pumping.
Adding Mineral Admixtures, for high flowability and the more concrete of cement consumption, can reduce concrete hydration heat, delay the appearance of aquation peak value, reduce the thermograde of inside concrete, reduce concrete thermal stress, can improve the degree of compactness of concrete structure simultaneously, thereby reach the purpose that the prevention distress in concrete produces.
Adopt less cement, sandstone, the swelling agent of reduction concrete shrinkage, water-resisting agent, the adulterant of dry shrinkage, after optimizing proportioning, configure the closely knit matrix concrete of structure with rigid waterproofing anti-cracking function, admixture modified polypropylene fiber on this concrete basis then, prevent that concrete from destroying in the textural defect of different directions, made full use of the functionality advantage of the various starting material of concrete in concrete, improved the anti-cracking concrete ability, prolong concrete work-ing life.Every after testing main mechanical performance index meets design requirement, production cost of the present invention is low, favorable working performance, in corresponding environmental work, have good anti-leakage, anticracking, protection against the tide, protect the muscle effect, improved concrete weather resistance, improved the work-ing life of buildings, possessed and temper toughness with gentleness, anti-crack and anti-seepage function supple and hard with solidness in softness.Realized the combination of inorganic rigid anticracking, organic rigid anticracking and compound material flexible anticracking, improved the function of cement-based gelling material, made concrete to high-performance, multifunctional direction development.Be applicable to various wet environments or dry environment anti-permeation cracking-resistant construction work premixing, pump concrete.
Below in conjunction with embodiment the present invention is described in detail:
The fibre anti-permeation cracking-resistant concrete starting material are selected embodiment:
(1) cement: ordinary Portland cement 32.5;
(2) sand: medium sand M
0=2.8;
(3) stone: crushed gravel d=25.0;
(4) admixture: TZ1-2 water reducer or similar water reducer, mix outward;
(5) slag powders: in mix specific surface area 400 ± 20m
2/ kg, volume press 5%～50% of cement weight, and the optimum mix amount is at 20%-30%;
(6) flyash: in mix II level flyash, volume is pressed 5%～50% of cement weight, the optimum mix amount 40%～50%.
(7) water-resisting agent: admixture FS water-resisting agent or other similar water-resisting agent, volume is pressed 0.5%～5.0% of cement weight, the optimum mix amount 2.5%.
(8) swelling agent: UEA swelling agent or other similar swelling agent, the volume scope is pressed 6%～12% of cement weight, and its optimum mix amount is 8%～10%.At the preferred proportioning embodiment one of moist Working environment, in dry environment, should match composition and division in a proportion embodiment two as the scope of application.
(9) fiber of Cai Yonging has polypropylene fibre, glass fibre or steel fiber.
Polypropylene fibre can be selected modification bundle fiber, netted staple fibre, monofilament shape fiber or durafiber, and fibers content is the selection 0.1kg/m by gelling material weight
3, 0.6kg/m
3, 1.0kg/m
3, 1.4kg/m
3, the optimum mix amount is 1kg/m
3, its Fibre diameter is generally about 20 μ m.
Also can the admixture steel fiber, strengthen concrete tension, bending resistance equal strength, improve wear-resisting, shock-resistant, antifatigue, toughness and cracking resistance, performances such as antiknock, the fibrous concrete that is used for pumping construction, the volume of steel fiber can select outer mixing to account for 0.5%, 1.0%, 1.5%, 2.0% of binder total amount, the optimum mix amount 1.5% in the mixture.
When mixing glass fibre, volume can select to account for 0.5%, 1.0%, 1.5%, 2.0% of binder total amount outward.
Fibre anti-permeation cracking-resistant concrete strength grade of the present invention can be C30, C40, C50, C60.
Fibre anti-permeation cracking-resistant concrete C30 strength grade mixing ratio by weight embodiment one of the present invention:
Water cement sandstone fly-ash mine ground-slag TZ1-2 UEA FS polypropylene fibre
172 240 750 1036 100 100 9.2 35 0 1kg/m
3
Fibre anti-permeation cracking-resistant concrete C30 strength grade mixing ratio by weight embodiment two of the present invention:
Water cement sandstone fly-ash mine ground-slag TZ1-2 UEA FS polypropylene fibre
172 240 750 1036 100 100 9.2 0 12 1kg/m
3
The manufacture craft of fibre anti-permeation cracking-resistant concrete of the present invention:, after weighing by proportioning, go into stirrer, while stirring the admixture polypropylene fibre with cement, sandstone, swelling agent, water-resisting agent, adulterant.
Claims (8)
1, fibre anti-permeation cracking-resistant concrete is characterized in that: its component and addition content are
(1) ordinary Portland cement;
(2) medium sand;
(3) stone;
(4) water reducer;
(5) slag powders: in mix specific surface area 400 ± 20m2/Kg slag powders, volume is pressed 5%～50% of cement weight;
(6) flyash: in volume by 5%～50% of cement weight;
(7) water-resisting agent: in volume by 0.5%～5.0% of cement weight;
(8) swelling agent: volume is by 6%～12% of cement weight in the UEA;
(9) volume of poly-third fiber is the outer 0.1kg/m that mixes by gelling material weight
3-2.0kg/m
3
2, fibre anti-permeation cracking-resistant concrete according to claim 1 is characterized in that: described polypropylene fibre is modification bundle fiber, netted staple fibre, monofilament shape fiber or durafiber.
3, fibre anti-permeation cracking-resistant concrete according to claim 1 is characterized in that: described slag powders the optimum mix amount 20%-30%.
4, fibre anti-permeation cracking-resistant concrete according to claim 1 is characterized in that: described flyash the optimum mix amount 40%～50%.
5, fibre anti-permeation cracking-resistant coagulation according to claim 1 ±, it is characterized in that: described water-resisting agent the optimum mix amount 2.5%.
6, fibre anti-permeation cracking-resistant concrete according to claim 1 is characterized in that: the volume of described swelling agent UEA the best is 8%-10%.
7, fibre anti-permeation cracking-resistant concrete according to claim 1 is characterized in that: the optimum mix amount of described poly-third fiber is 1kg/m
3
8, fibre anti-permeation cracking-resistant concrete according to claim 1 is characterized in that: described water-resisting agent and swelling agent are selected an admixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011402334A CN1166580C (en) | 2001-12-07 | 2001-12-07 | Fibre anti-permeation cracking-resistant concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011402334A CN1166580C (en) | 2001-12-07 | 2001-12-07 | Fibre anti-permeation cracking-resistant concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1385394A true CN1385394A (en) | 2002-12-18 |
| CN1166580C CN1166580C (en) | 2004-09-15 |
Family
ID=4675737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011402334A Expired - Fee Related CN1166580C (en) | 2001-12-07 | 2001-12-07 | Fibre anti-permeation cracking-resistant concrete |
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| CN101186471B (en) * | 2007-12-14 | 2010-09-29 | 中天建设集团有限公司 | Concrete |
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| CN101486548B (en) * | 2009-02-20 | 2012-03-21 | 徐州建筑职业技术学院 | C50 mass concrete mixing proportion |
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