CN1107813A - Process for producing, early strength expansive cement - Google Patents

Process for producing, early strength expansive cement Download PDF

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Publication number
CN1107813A
CN1107813A CN94118439A CN94118439A CN1107813A CN 1107813 A CN1107813 A CN 1107813A CN 94118439 A CN94118439 A CN 94118439A CN 94118439 A CN94118439 A CN 94118439A CN 1107813 A CN1107813 A CN 1107813A
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Prior art keywords
ashes
gypsum
cement
clinker
strength
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CN94118439A
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CN1039582C (en
Inventor
曹重仪
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SONGYUAN CEMENT CO Ltd HUADIAN
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SONGYUAN CEMENT CO Ltd HUADIAN
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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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
    • 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 technology for producing early-strength K-type expanding cement uses Portland cement clinker, thioaluminate clinker, gypsum and furnace ash as raw materials. The final product containing C3S, C2S and C4A3S features expanding nature, early strength, quick hardening, stably raised post strength, and low cost.

Description

Process for producing, early strength expansive cement
The present invention relates to the production technique of early strength expansive cement, relating to furtherly with Portland clinker, sulfoaluminate clinker, gypsum and ashes is the production technique of the early strong K type expansive cement of feedstock production.
As far back as 1936, the Losail of France was at first made raw material mature calcined material in rotary kiln with the chalk of 50% gypsum, 25% red bauxite and 25%, with the slag and the common grinding of portland cement clinker of suitable proportion, had produced expansive cement then.The Ke Laien of California, USA university in 1958 and colleague thereof have invented K type expansive cement on the basis of Losail, its manufacturing process and chemical ingredients are similar to the cement of Losail, but contain three component composition in the expansion component of K type cement-calcium sulphoaluminate C 4A 3S(3CaO, Al 2O 3, CaSO 4) and free calcium oxide (fCaO), K type cement adopt mostly calcining calcium sulphoaluminate cement clinker separately then with the production method of the common grinding of Portland clinker.Japanese then after the patent of having bought Ke Laien through research with improve, developed the abbreviation of CSA(calcium sulphoaluminate) cement, different with technology produced in USA is, Japan is after the calcining sulfoaluminate clinker, it is ground into the CSA swelling agent separately, and mix as commodity cement and to make expansive cement, this method is flexible and convenient to use, but requires on-the-spot have equipment and more operating technique preferably.In recent years, there are many countries to study or developed oneself K type expansive cement or CSA swelling agent in succession in the world.But there is a major defect in these prior aries, and promptly they only have expansion and early epistasis energy or intensity level are not lower usually, and setting time is also longer relatively, and its production cost is also higher relatively in addition, is difficult to satisfy the needs of modern construction engineering.Recently CN 1061581 discloses the method for making expansive agent for cement slurry of boiling furnace combustion coal desulfurization waste residue (being ashes), but by its make product do not have morning its later stage folding strength of epistasis and ultimate compression strength also lower.
Therefore the object of the present invention is to provide the production technique of a kind of early strength expansive cement (early strong K type expansive cement), this cement has different mineral compositions, it is when having expansion character, also have early strong, fast hard characteristics, its stable long-term strength raises, and its production cost also reduces significantly simultaneously.
Production technique of the present invention comprises the following steps:
(1) raw material is prepared:
1. prepare Portland clinker: require 3 days ultimate compression strength 〉=28MPa of this grog, 28 days ultimate compression strength 〉=480MPa, its mineral composition (weight percent) is C 3S:55-75%, C 2S22-35%; Free CaO≤3.5%;
2. prepare sulfoaluminate clinker: require its 3 days ultimate compression strength 〉=42.5MPa, its mineral composition (weight percent) is C 4A 3S 〉=55%; β-C 2S 〉=25%;
3. gypsum: SO 3Content 〉=38%(weight); And
4. ashes: loss on ignition≤3%, active SiO 2Content 〉=60%(weight).
(2) raw material mixes: the mixing match scope of various raw materials is (weight percent):
Its preferred range is
Portland clinker: 60-85% 60-65%
Sulfoaluminate clinker: 3-15% 8-12%
Gypsum: 3-20% 5-10%
Ashes: 5-30% 15-30%
(3) grinding and packing: grinding is to being that screen over-size is for less than 7% fineness and packing on 80 microns the square hole sieve in the length of side in ball mill with above-mentioned compound, and the mineral composition of the finished product is by C 3S, C 2S and C 4A 3S forms.
The manufacturing processed of Portland clinker of the present invention and sulfoaluminate clinker all can adopt the common sintering process manufacturing in this area, for example can adopt rotary kiln, shaft kiln to come sintering, as long as these grogs satisfy above-mentioned requirements separately.
The used gypsum raw material of the present invention can be phosphogypsum or dihydrate gypsum, and used ashes for example can be the fluidizing furnace ashes, as long as they satisfy above-mentioned requirements separately and promptly can be used for the present invention.
Raw material of the present invention mixes and the grinding step does not have special Processes and apparatus requirement, and they can adopt this area process means and equipment commonly used to finish.
For a more detailed description with reference to embodiment below to the present invention.
In the following table 1 respectively to morning of the present invention strong K type expansive cement production technique ratio range and products thereof expansion character, early epistasis can (presetting period) and anti-ly roll over, ultimate compression strength illustrates.
Figure 941184390_IMG1
Annotate: it is that maintenance is surveyed 1,3,7,14,28 day rate of expansion respectively, standard consistency in the water after measuring initial value that rate of expansion is measured: 30.2%, measure with reference to JC311-82.
Morning of the present invention as can be seen from Table 1, strong K type expansive cement had superior expansion character, suitable epistasis energy morning, and its stable long-term strength rises, and this cement can be used for preparing expansive concrete and self-stressing cement concrete.
Following table 2 will to make by production technique of the present invention 425 #And 525 #Anti-folding, the ultimate compression strength of early strong K type expansive cement are described, and correspondingly itself and Portland cement are contrasted, and all these tests are all undertaken by GB GB175-92.
Table 2 unit: MPa
3 days 28 days
Anti-folding Resistance to compression Anti-folding Resistance to compression
425 ＃ The present invention 5.0 26.1 8.4 55.2
Portland cement 4.5 21.2 7.6 52.9
525 ＃ The present invention 5.7 29.1 9.0 65.7
Portland cement 5.4 27.8 8.6 60.7
The strong K type expansive cement 425 morning that makes by production technique of the present invention as can be seen from Table 2 #All be higher than common 425 in 3 days, 28 days anti-foldings, ultimate compression strength #Cement is near common 525 #Cement, and of the present invention 525 #No matter cement is the intensity of early stage (3 days), or the intensity in later stage (28 days) all is higher than prior art 525 #Cement.
To describe some other performance of the strong K type expansive cement morning that is made by production technique of the present invention below, these parameters are tested by GB175-92 and JC313-82.
Proportion Fineness The initial set time-division The final set time-division Stability Weather resistance three months Frost resistance Permeability resistance
1.25 2.4 0:40 1:18 Qualified Anti-folding and anti-pressing 9.6 61.5 Freeze back 65.6 60.0 556.3 534.3 before freezing after freezing before loss of strength weight loss is frozen 7 days 28 days S＞1.0 S＞1.2
Comprehensive these performances recited above, production technique of the present invention as can be seen compared with prior art, it adopts unique proportioning raw materials, it has used the refuse ashes, the contriver finds that through a large amount of experiments ashes of the present invention can replenish mutually with the sulfoaluminate clinker composition, synergy, improved the expansion character of this cement, both made epistasis energy morning of this cement moderate, the needs that meet construction, increased the later strength of cement again, reduced cost significantly simultaneously, specifically the effect of ashes of the present invention is:
1. contained a large amount of active SiO in the ashes 2Can meet hydrate with the free CaO in the process, form C 2S, thus the later strength of this cement improved;
2. ashes easily grind, and its specific surface area is bigger, have relatively improved the early strength and the hydration rate of cement;
3. aquation is too fast sometimes for sulplo-aluminate, and adding ashes in admixtion can act synergistically, replenish mutually with sulfoaluminate clinker and gypsum, thereby can suitably prolong hydration time, makes later strength can stablize rising;
4. use ashes can reduce this Cement Production cost significantly.
Just because of above-mentioned reason, can obtain to have the high-quality expansive cement that special mineral is formed by the present invention, after testing, its mineral composition is mainly by C 3S, C 2S and C 4A 3S forms, and does not contain free CaO, and prior art then contains a certain amount of free CaO.
Strong K type expanding cement morning that is made by technology of the present invention has the characteristics of fast solidifying, early strength height, stable long-term strength rising, it also has good freeze proof, impervious, durability and good dilatancy, the sclerosis post-shrinkage ratio is littler, expansion rate is greater than drying shrinkage, thereby reaches or keep the contraction compensation effect of microdilatancy state. In addition because the present invention mixes Portland clinker, sulfoaluminate clinker, gypsum and ashes in advance, grinding becomes the cement product, mixing at the construction field (site), whipping step have been saved, it is extremely convenient not only to use, reduce operating personnel's specification requirement, and improved properties of product. The cement that is made by the present invention can be used to mix expansive concrete processed, makes the structures of cracking resistance, waterproof, also can be used to mix self-stressing concretes processed, for the manufacture of external pressure tube and interior pressure pipe. Have above-mentioned characteristics just because of this product in addition, it is specially adapted at cold district Construction, be conducive to the reduction of erection time, improve waterproof, the anti-permeability performance of building, greatly improved construction quality.

Claims (3)

1, the production technique of early strength expansive cement comprises the following steps:
(1) raw material is prepared:
1. prepare Portland clinker: require 3 days ultimate compression strength 〉=28MPa of this grog, 28 days ultimate compression strength 〉=480MPa, its mineral composition (weight percent) is C 3S:55-75%, C 2S22-35%; Free CaO≤3.5%;
2. prepare sulfoaluminate clinker: require its 3 days ultimate compression strength 〉=42.5MPa, its mineral composition (weight percent) is C 4A 3S 〉=55%; β-C 2S 〉=25%;
3. gypsum: SO 3Content 〉=38% (weight); And
4. ashes: loss on ignition 3%, active SiO 2Content 〉=60% (weight)
(2) raw material mixes: the mixing match scope of various raw materials is (weight percent):
Portland clinker: 60-85%
Sulfoaluminate clinker: 3-15%
Gypsum: 3-20%
Ashes: 5-30%
(3) grinding and packing: grinding is to being that screen over-size is for less than 7% fineness and packing on 80 microns the square hole sieve in the length of side in ball mill with above-mentioned compound, and the mineral composition of the finished product is by C 3S, C 2S and C 4A 3S forms.
2, the production technique of early strength expansive cement according to claim 1, the mixing match scope of wherein said various raw materials is preferably (weight percent):
Portland clinker: 60-65%
Sulfoaluminate clinker: 8-12%
Gypsum: 5-10%
Ashes: 15-30%
3, the production technique of early strength expansive cement according to claim 1, wherein said gypsum are dihydrate gypsum or phosphogypsum, and described ashes are the fluidizing furnace ashes.
CN94118439A 1994-11-30 1994-11-30 Process for producing, early strength expansive cement Expired - Fee Related CN1039582C (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1050111C (en) * 1997-07-19 2000-03-08 浙江大学 Production method of slightly expanded portland cement
CN1061951C (en) * 1997-01-08 2001-02-14 中国建筑材料科学研究院水泥所阳泉联营特种水泥厂 Super high strength quick hardening sulfaluminous cement
CN103209925A (en) * 2010-11-11 2013-07-17 电气化学工业株式会社 Production method for beta-2CaOSiO2
CN103328383A (en) * 2011-02-03 2013-09-25 电气化学工业株式会社 Process for producing ss-2caosio2
CN104724967A (en) * 2013-12-20 2015-06-24 南京中联水泥有限公司 Method for prolonging setting time of cement
CN112830697A (en) * 2021-01-20 2021-05-25 北京工业大学 Excitation C3S hydrated composite gelled material

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1015445B (en) * 1988-05-21 1992-02-12 中国建筑材料科学研究院 Composition of high-quality plumping agent of concrete and manufacturing method
CN1015446B (en) * 1989-01-26 1992-02-12 武汉工业大学 Barium-containing sulfoaluminate cement

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1061951C (en) * 1997-01-08 2001-02-14 中国建筑材料科学研究院水泥所阳泉联营特种水泥厂 Super high strength quick hardening sulfaluminous cement
CN1050111C (en) * 1997-07-19 2000-03-08 浙江大学 Production method of slightly expanded portland cement
CN103209925A (en) * 2010-11-11 2013-07-17 电气化学工业株式会社 Production method for beta-2CaOSiO2
CN103209925B (en) * 2010-11-11 2015-06-10 电气化学工业株式会社 Production method for beta-2CaOSiO2
CN103328383A (en) * 2011-02-03 2013-09-25 电气化学工业株式会社 Process for producing ss-2caosio2
CN104724967A (en) * 2013-12-20 2015-06-24 南京中联水泥有限公司 Method for prolonging setting time of cement
CN112830697A (en) * 2021-01-20 2021-05-25 北京工业大学 Excitation C3S hydrated composite gelled material

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