CN1069294C - Method for manufacturing high-early flyash cement concrete - Google Patents

Method for manufacturing high-early flyash cement concrete Download PDF

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Publication number
CN1069294C
CN1069294C CN97109254A CN97109254A CN1069294C CN 1069294 C CN1069294 C CN 1069294C CN 97109254 A CN97109254 A CN 97109254A CN 97109254 A CN97109254 A CN 97109254A CN 1069294 C CN1069294 C CN 1069294C
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cement
flyash
concrete
cement concrete
early
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Expired - Fee Related
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CN97109254A
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CN1187475A (en
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潘智生
林宗寿
刘顺妮
寇世聪
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Wuhan Polytechnic University
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Wuhan Polytechnic University
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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
    • C04B28/18—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 mixtures of the silica-lime type
    • 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
    • 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 method for manufacturing high and early strength powdered coal ash cement concrete, which prepares the powdered coal ash cement concrete by mixing finely ground hard gypsum (or calcined gypsum), cement, powdered coal ash, stones, sand, water and a water reducing agent according to a certain proportion. The method for manufacturing high and early strength powdered coal ash cement concrete can prompt C3A and C4AF in the cement and activity Al2O3 in the powdered coal ash to react with the hard gypsum (or the calcined gypsum) Ca(OH)2 to form a large amount of fibrous entringite, the strength of the early phase and the later phase of the powdered coal ash cement concrete can be substantially enhanced, and the method for manufacturing high and early strength powdered coal ash cement concrete is the good method for manufacturing the high strength powdered coal ash cement concrete.

Description

A kind of method for manufacturing high-early flyash cement concrete
The invention belongs to material of construction coagulation great soil group.
Mix a small amount of flyash in existing cement concrete after, because the micro mist effect of flyash can have certain reinforced effects to concrete, this enhancement is mainly reflected on the later strength.But after replacing cement with a certain amount of flyash usually, concrete early strength (3 days, 7 days) all can have certain decline, particularly more than flyash is with large volume (45%), replace behind the cement early age strength of concrete and descend more obviously, give and make high blending flyash high-strength cement concrete and brought difficulty.Though can take certain methods solve this problem as: utilizing high efficiency water reducing agent to reduce water cement ratio etc. can increase concrete degree of compactness, does not fundamentally change flyash and replaces the low excessively situation of cement concrete early strength behind the cement with large volume.
The purpose of this invention is to provide a kind of can fundamentally change flyash and replace cement with large volume after, the low excessively method of water coagulation soil intensity.Adopt method of the present invention that the early strength of fly ash cement concrete is improved greatly.Its advantage is: early strength can doubly improve after flyash replaced concrete cement with large volume.
Of the present invention being described in detail as follows:
Anhydrite (or bassanite) is mixed in the mixture of cement and flyash, method of design according to normal concrete calculates raw-material proportionings such as cement, flyash, stone, sand, water, be equipped with high efficiency water reducing agent and stir the moulding fly ash cement concrete, carry out atmospheric steam curing after the quiet 5-24 of stopping hour and can produce the high-strength fly-ash cement concrete.
All contain a small amount of gypsum in the silicate cement, its effect mainly is to be used for regulating some performances that cement setting time can also be improved cement in addition.C in the cement 3A, C 4The hydrated product of AF is the sour calcium of aquation aluminium (iron).Aquation or the sour calcium of aquation aluminium (iron) under the condition of gypsum are being arranged, but owing to amount of gypsum deficiency in the cement.Under general aquation condition, the content of the sour calcium of aquation sulphur aluminium (iron) seldom in the hydrated product of cement, after ordinary fly ash is with the cement in the large volume replacement concrete, because the poor activity of flyash, the early hydration rate is very low, basically do not have hydration reaction, can only play a kind of filling effect at most, so just greatly reduce the early strength of cement concrete.If can impel C in the cement 3A, C 4AF hydrated cementitious in early days more aquation form the sour calcium of aquation sulphur aluminium (iron), make the active A l in the flyash simultaneously 2O 3Ca (OH) with hydrated cementitious formation 2With SO 3Form ettringite, so not only can improve the early strength of cement concrete, can also improve the activity of flyash, make it carry out hydration reaction forms supplementary function to concrete strength hydrated product ahead of time.Anhydrite (or bassanite) is because its water content is low, and dissolution rate is slow, and C can be provided rightly 3A, C 4Active A l in AF and the flyash 2O 3Required SO during reaction 3, it not only makes C in the cement as a kind of toughener 3A, C 4AF does sth. in advance aquation and generates ettringite, simultaneously active A l in the flyash 2O 3With Ca (OH) 2And SO 3Reacting ahead of time generates fibrous ettringite, and because the dissolution rate of anhydrite (or bassanite) is slow, can not make sour calcium of aquation sulphur aluminium (iron) and SO 3Further reaction generates different in nature ettringite and causes ettringite to expand and destroy concrete intensity.Because the generation of aquation sulphur aluminium (iron) hydrochlorate must be carried out at a certain temperature, therefore, produces concrete of the present invention and must carry out vapor cure under normal pressure.
Fig. 1: high-early flyash cement concrete manufacturing process flow diagram
The raw material types that is adopted in the method for the present invention is as follows:
Cement comprises: silicate cement, normal silicate, limestone portland cement.Flyash is the flyash that fly ash in electric power plant comprises dry-extraction method and wet discharging: anhydrite is natural anhydrite or bassanite: high efficiency water reducing agent comprises all kinds of water reducers such as UNF-II water reducer, NF water reducer, SN-2: stone, sand, water are identical with the manufacturing portland cement concrete.
The amount of flyash replacement cement is that 15～55% (weight) optimum quantity is 25～45% (weight) among the present invention, and the volume of gypsum (or bassanite) is the 6-14% (weight) of cement and flyash total amount, and the optimum mix amount is 8-12%.When ready-mixed concrete, should mix a spot of high efficiency water reducing agent, the consumption of high efficiency water reducing agent is 0.5～1.5% (weight) of cement and flyash and gypsum total amount.
The present invention must carry out atmospheric steam curing when producing fly ash cement concrete, curing temperature is 45-85 ℃, optimum curing temperature is 55-75 ℃/hour, curing time is 4-12 hour, best curing time is 6-8 hour, heat-up rate is 15-202/ hour, and optimum temperature rise speed is 18 ℃/hour.Other parameters of atmospheric steam curing are identical with normal concrete vapor cure condition.
Example one carries out concrete strength test by table one proportioning, adopts 100 * 100 * 100 test cubes, and the rubble maximum diameter is that 10mm (common grouan) cement consumption is 500kg/cm 3, the consumption of water is 150kg/m 3, sand coarse aggregate ratio is 0.4, stirs quietly after the moulding to stop carrying out in 24 hours vapor cure, rises to 65 ℃ of maintenances 6 hours with 15 ℃/hour heat-up rates, naturally cools to that maintenance is to each length of time in the water that immerses 27 ℃ after the room temperature, each age strength of gained the results are shown in Table 2.
Table one mix Design (unit: kg)
Numbering Technology Cement Flyash Anhydrite Stone Sand Water Water reducer Doping quantity of fly ash %
C 1 The present invention 425 75 50 977.47 725.25 150 0.5％ 15
C 2 The present invention 375 125 50 928.57 725.25 150 1.0％ 25
C 3 The present invention 325 175 50 879.68 725.25 150 1.2％ 35
C 4 The present invention 275 225 50 830.81 725.25 150 1.3％ 45
C 5 The present invention 225 275 50 782.00 725.25 150 1.5％ 55
Table two concrete strength unit (MPa)
Numbering C 1 C 2 C 3 C 4 C 5
Technology The present invention The present invention The present invention The present invention The present invention
3 days 72.62 67.07 63.87 60.42 55.29
7 days 83.49 80.70 75.07 68.70 63.39
28 days 106.13 102.97 91.40 83.30 78.86
Example two, carry out concrete strength test by table one and table three proportioning, adopt recuperate guard strip spare etc. of examination to see Table four with the ultimate compression strength of the fly ash cement concrete of example one identical gained normal concrete manufacture method and the inventive method manufacturing, the unit of various starting material consumptions represents with kg in the proportioning.
Table three mix Design (unit: kg)
Numbering Technology Cement Flyash Stone Sand Water Water reducer
PC 1 Common 425 75 1019.55 725.25 150 0.7％
PC 2 Common 375 125 970.65 725.25 150 1.0％
PC 3 Common 325 175 921.76 725.25 150 1.2％
PC 4 Common 275 225 872.89 725.25 150 1.0％
PC 5 Common 225 275 824.08 725.25 150 1.5％
Table four the present invention and common law are made concrete strength relatively (MPa)
Numbering 3 days 7 days 28 days
Common The present invention Common The present invention Common The present invention
PC 1 C 1 59.08 72.62 69.67 83.49 88.47 106.13
PC 2 C 2 54.24 67.07 62.09 80.70 86.66 102.97
PC 3 C 3 46.43 63.87 58.52 75.07 78.93 91.40
PC 4 C 4 39.42 60.42 49.87 68.70 70.79 83.30
PC 5 C 5 25.75 55.29 36.58 63.39 62.28 78.86
Example three. carry out concrete strength test by table five proportioning and adopt the examination body identical with example one, cement and doping quantity of fly ash are constant, the anhydrite volume accounts for 6～14% (weight) of cement and doping quantity of fly ash summation, and curing condition is identical with example one, and gained the results are shown in table six.
Table five mix Design (unit: kg)
Numbering Technology Cement Flyash Gypsum Stone Sand Water Water reducer
Y 1 The present invention 325 175 30 869.57 725.25 150 1.2％
Y 2 The present invention 325 175 40 888.09 725.25 150 1.2％
Y 3 The present invention 325 175 50 879.65 725.25 150 1.2％
Y 4 The present invention 325 175 60 871.26 725.25 150 1.3％
Y 5 The present invention 325 175 70 862.85 725.25 150 1.4％
The different gypsum addition of table six are to the influence (MPa) of concrete strength
Numbering Technology 3 days 7 days 28 days
Y 1 The present invention 57.93 68.72 79.56
Y 2 The present invention 59.92 70.07 85.28
Y 3 The present invention 63.87 75.07 91.40
Y 4 The present invention 55.68 67.84 86.45
Y 5 The present invention 54.35 64.34 82.39
Example four is pressed table one numbering C 3Proportioning examination body is identical with table one with curing condition takes different raise-position speed gained intensity to see Table seven.
The different heat-up rates of table seven are to the influence of intensity
Numbering Heat-up rate (C/h) 3 days 7 days 28 days
S 1 15 63.87 75.07 91.40
S 2 16 64.25 75.48 92.34
S 3 18 65.29 76.87 93.15
S 4 19 65.07 75.67 91.29
S 5 20 64.32 74.29 90.38
Example five: press table one numbering C 3Proportioning, examination body and other curing conditions take the intensity results of different curing gained to see Table eight with example one:
Table eight different curing is to the influence (MPa) of intensity
Numbering Curing temperature Technology 3 days 7 days 28 days
W 1 45℃ The present invention 42.14 54.80 72.46
W 2 55℃ The present invention 56.31 61.59 85.50
W 3 65℃ The present invention 63.87 75.07 91.40
W 4 75℃ The present invention 67.46 78.80 91.92
W 5 85℃ The present invention 87.20 77.74 90.43
Example six is pressed table one numbering C 3Proportioning, examination body and other curing conditions adopt the intensity results of different curing time gained to see Table nine with example one.
The different curing times of table nine are to the influence of intensity
Numbering Curing time Technology 3 days 7 days 28 days
h 1 4h The present invention 54.66 70.38 84.32
h 2 6h The present invention 63.87 75.07 91.40
h 3 8h The present invention 64.79 76.05 91.59
h 4 10h The present invention 65.59 76.32 91.89
h 5 12h The present invention 66.79 78.42 93.18

Claims (3)

1, a kind of method for manufacturing high-early flyash cement concrete, stir after it is characterized in that levigated anhydrite (or bassanite), cement, flyash, stone, sand, water and water reducer cooperated according to a certain ratio after the moulding, quiet stopping maintenance 5-24 hour, further carry out atmospheric steam curing and rise to 45-80 ℃ with 10-20 ℃ of heat-up rate per hour and naturally cool to normal temperature after maintenance 4-12 hour again, can increase substantially the early stage and later strength of fly ash cement concrete like this.
2,, it is characterized in that the amount of the flyash replacement cement in the concrete of manufacturing is 15-55% (weight) according to right 1 described a kind of method for manufacturing high-early flyash cement concrete; The outer volume of anhydrite (or bassanite) accounts for the 6-14% (weight) of cement and flyash total amount, and the volume of water reducer accounts for cement, 0.5～1.5% (weight) of flyash and anhydrite (or bassanite) total amount.
3, require described method according to right 1 and right 2, it is characterized in that, behind the concrete formation, quiet stopping maintenance 5-24 hour, logical steam rises to 45～85 ℃ with 10-20 ℃ of heat-up rate per hour and naturally cools to room temperature after maintenance 4-12 hour again under normal pressure then.
CN97109254A 1997-09-25 1997-09-25 Method for manufacturing high-early flyash cement concrete Expired - Fee Related CN1069294C (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104016622A (en) * 2014-04-30 2014-09-03 枞阳县天筑新型建筑材料有限公司 Boric-sludge-containing water-resistant concrete and preparation method thereof
CN104030617A (en) * 2014-04-30 2014-09-10 枞阳县天筑新型建筑材料有限公司 Waterproof easy-maintenance concrete and preparation method thereof
CN104058645B (en) * 2014-05-29 2016-03-23 蚌埠华东石膏有限公司 A kind of containing easy curing concrete of fluorite and preparation method thereof
CN106810166A (en) * 2017-02-20 2017-06-09 内蒙古科技大学 A kind of flyash concrete of anti-sulfur dioxide corrosion
CN112479648A (en) * 2020-11-13 2021-03-12 中建西部建设湖南有限公司 Short-term self-decomposition concrete for temporary member and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1034354A (en) * 1987-11-21 1989-08-02 武汉工业大学 Method for making steam curing cement
CN1036940A (en) * 1988-04-13 1989-11-08 李绍模 The compound method of high-strength special pulverized fuel ash cement and compound thereof early
CN1172085A (en) * 1996-07-29 1998-02-04 舒金莲 Flyash compound cement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1034354A (en) * 1987-11-21 1989-08-02 武汉工业大学 Method for making steam curing cement
CN1036940A (en) * 1988-04-13 1989-11-08 李绍模 The compound method of high-strength special pulverized fuel ash cement and compound thereof early
CN1172085A (en) * 1996-07-29 1998-02-04 舒金莲 Flyash compound cement

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