CN101746973A - Cracking cement - Google Patents
Cracking cement Download PDFInfo
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- CN101746973A CN101746973A CN200810203896A CN200810203896A CN101746973A CN 101746973 A CN101746973 A CN 101746973A CN 200810203896 A CN200810203896 A CN 200810203896A CN 200810203896 A CN200810203896 A CN 200810203896A CN 101746973 A CN101746973 A CN 101746973A
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Abstract
The invention relates to cracking cement, which is characterized in that the cement comprises the following components in weight percent: 50-70% of cement clinker, 10-15% of flyash crystal, 5-10% of sulfur waste, 3-6% of free gypsum dehydration, 1-0.5% of auxiliary dissolving slag and 5-8% of lime stone. In the preparation of the cracking cement of the invention, a special mixed material is doped in advance, to lead the prepared concrete member constituted by cracking cement to dispel the strength and abrasive resistance of the member constituted by the cracking cement by the generated temperature and abrasive force under the abrasive action of the tunnel shield. Therefore, the cracking cement leads the tunnel shield to go into and out of the tunnel, thus increasing capability of tunnel shield cutters to cut concrete, reducing abrasion of cutters, ensuring the quality of the tunnel shield going into and out of the tunnel, greatly lowering construction difficulty, accelerating construction speed, saving a large amount of labor force and financial resources and conforming to requirements of circular economy.
Description
Technical field:
The present invention relates to technical field of cement, specifically a kind of its performance under normal operation meets the characteristic of silicate cement, but when needing to handle is that cement setting body intensity and wear resistance sharply descend under the effect of external cause temperature, abrasive forces, accelerate the speed of processing, reduce energy consumption and labour's special silicate cement, i.e. cracking cement required when handling.
Background technology:
Along with the continuous development of city tunnel engineering, urban track traffic line and subterranean tunnel in constantly planning and building, solve technical variety of issue along with development presses for the material with various performances.Therefore we are necessary to include underground works the category of special cement in cement, and develop the series product that adapt to different function requirements in the Tunnel Engineering.
Underground diaphragm wall in the underground works has that the degree of depth of going along with sb. to guard him is dark, strength of wall body is big, high efficient construction, is one of constructional method of going along with sb. to guard him of subway tunnel station pit, and is used widely.Yet concerning the shield driving construction, exist more unfavorable factor; The geographic soil layer in Shanghai belongs to the water-borne sediments, Yangtze River Delta, the general soft clay ground of forming by clay, silty clay or more fine grain flour sand, propulsive cutter of shield structure and cutterhead rigidity with respect to hard rock or gravel is little, cost is low, therefore the shield cutter with configuration like this passes in and out the hole, the big body of wall of high strength, hardness of cutting underground diaphragm wall, not only the wearing and tearing to cutter are quite big, and the long construction period energy consumption is many.
Summary of the invention:
The object of the present invention is to provide a kind of improved subway station bracing of foundation pit diaphragm wall to water when smashing cracking cement required in the concrete, it can overcome its member grindability and the relatively poor some shortcomings of intensity retractility behind the prior art mesosilicic acid salt cement concrete batching.
To achieve these goals, technical scheme of the present invention is: a kind of cracking cement, it is characterized in that: each composition weight percent of described cement ingredient is as follows: cement clinker 50%～70%, flyash crystal 10%～15%, sulphur slag 5%～10%, desulfurated plaster 3%～6%, hydrotropy slag 1%～0.5%, Wingdale 5%～8%, the weight percent sum of above-mentioned each batching is 100%.
The present invention is when this cracking cement of preparation during use, mix the concrete member that a kind of special mixing material is formed the cracking cement that makes in advance, shield structure abrasive action following the temperature that produces and abrasive forces clear up component strength and the wear resistance that cracking cement is formed, therefore, when this cracking cement makes shield engine turnover hole, quicken shield cutter cutting concrete ability, reduce the wearing and tearing of cutter, guarantee shield structure turnover hole quality, can reduce difficulty of construction to a great extent, speed up the work, and can save great amount of manpower and financial resources, meet the requirement of recycling economy.
Embodiment:
The invention will be further described below in conjunction with chart and embodiment.
A kind of cracking cement of the present invention, its difference with the prior art is: each composition weight percent of described cement ingredient is as follows: cement clinker 50%～70%, flyash crystal 10%～15%, sulphur slag 5%～10%, desulfurated plaster 3%～6%, hydrotropy slag 1%～0.5%, Wingdale 5%～8%.3 days intensity of cement clinker are greater than 28MPa, and intensity was greater than 58MPa in 28 days.The chemical ingredients of cement clinker is: SiO
2Be 20%～30%, Fe
2O
3Be 3%～6%, Al
2O
3Be 5%～10%, CaO is 55%～65%, and MgO is 1%～2%, and f-CaO is 0.5%～3.0%, SO
3Be 0.1%～0.5%.
The mineral composition of cement clinker is: C3S is 50%～60%, C
2S is 20%～30%, C
3A is 4%～10%, C
4AF is 10%～15%.
Flyash crystalline chemical ingredients is: SiO
2Be 30%～40%, Fe
2O
3Be 4%～9%, Al
2O
3Be 20%～30%, CaO is 3%～18%, and MgO is 0.5%～3.5%, TiO
2Be 0.1%～0.3%, Na
2O is 0.3%～0.8%, K
2O is 0.4%～0.9%, SO
3Be 0.8%～1.9%, f-CaO is 0.5%～3.0%.
The chemical ingredients of sulphur slag is: S is 30%～40%, SiO
2Be 20%～40%, Fe
2O
3Be 2.5%～4.5%, Al
2O
3Be 3%～9%, CaO is 2%～16%, and wherein fineness 40um accounts for 5%～18%, and loss on ignition Loss is 2%～5%.The desulfurated plaster chemical ingredients is: SiO
2Be 2%～4%, Fe
2O
3Be 0.5%～3%, Al
2O
3Be 1%～3%, CaO is 43%～53%, and MgO is 0.5%～1.5%, and loss on ignition Loss is 25%～35%.
The Wingdale chemical ingredients is: SiO
2Be 2%～14%, Fe
2O
3Be 0.5%～13%, Al
2O
3Be 1%～13%, CaO is 45%～53%, and MgO is 0.5%～15%, and wherein loss on ignition Loss is 25%～35%.
Hydrotropy dreg chemistry composition is: TFe is 5%～10%, and S is 0.5%～2%, and P is 0.5%～1%, and CuO is 30%～40%, CaO is 5%～20%, and MgO is 1%～5%, Al
2O
3Be 10%～20%, SiO
2Be 2.0%～3.0%, wherein loss on ignition Loss is 5%～10%.
Wherein the sulphur slag is that the waste residue thing after petrochemical plant is extracted is a kind of industrial waste, the former landfill of taking of petrochemical plant, the present invention passes through chemical analysis, its quality of testing Physical Test and little mill can satisfy cracking cement fully with requiring, and do not need to carry out other special processing, as long as its chemical ingredients satisfies controlling index and just can use.
Desulfurated plaster is that a kind of industrial waste of power plant was also taked discarded burying method originally.Desulfurated plaster has substituted the plaster of paris fully in manufacture of cement.The present invention can satisfy cracking cement with requiring by testing it, and does not need to carry out other special processing, as long as its chemical ingredients satisfies controlling index and just can use.The present invention has utilized two kinds of original useless industrial wastes, and the not only low but also energy-conserving and environment-protective of its wide material sources cost have met the development of recycling economy.Cracking cement after making its quality under no specified conditions satisfies the existing silicate cement relevant criterion of country, but obvious decline can appear in intensity and wear resistance under the specified conditions influence; Its member has grindability and intensity retractility preferably behind the cracking cement concrete batching.
The cracking cement formula is improved concrete performance mechanism carries out following analysis:
Base-material has utilized the different melting points of material, the microgap is filled by easy melt, the blended material that mixes different melting points among the present invention and assist blended material hydrotropy slag advanced cracking cement that suitable prescription uses concrete and has the heat that obtains and chemical reaction takes place make body of cement inside the cracked effect occur in the external force wear process.
In force,
Cracking cement and concrete admixture compatibility test be table one as a result:
Cracking cement and concrete admixture with second trial are tested compatibility test, and by table one data presentation, its adaptability is better than ordinary Portland cement, and this can be used for the concrete preparation and use.
The second trial result of cracking cement end formulation shows: denseness is average: initial set 26.0%～28.5%: 2 hours 15 minutes～3 hours 30 minutes, final set: 3 hours 50 minutes～4 hours 30 minutes
Intensity was greater than 24.4MPa in three days, 20 top eight's degree are greater than 49.8MPa, fineness 0.08mm1.0%～2.0%, the mortar degree of mobilization is greater than 180mm, loss on ignition is less than 4.8%, sulphur trioxide 2.0%～3.0%, magnesium oxide is less than 4.8%, stability is qualified, the national standard specification of quality that has met silicate PO42.5 cement through test of many times cracking cement intensity and performance when no external cause, its proportioning is: cement clinker 50%～70%, flyash crystal 10%～15%, sulphur slag 5%～10%, desulfurated plaster 3%～6%, hydrotropy slag 1%～0.5%, Wingdale 5%～8%, the weight percent sum of above-mentioned each batching is 100%.
The cracking cement chemical ingredients is: SiO2 is 20%～30%, Fe
2O
3Be 3%～5%, Al2O3 is 3%～6%, and CaO is 45%～55%, and MgO is 1%～4%, and TiO2 is 0.3%～0.1%, and Na2O is 0.4%～0.7%, SO3 is 2.0%～3.0%.
Cracking cement intensity cleavage rate test detected result table two:
| 3d is untreated | 3d handles | 3 days cleavage rate % | 28d is untreated | 28d handles | 28 days cleavage rate % | |
| Cracking cement 1 | ??27.2 | ??24.6 | ??9.56 | ??53.2 | ??42.2 | ??20.68 |
| Cracking cement 2 | ??24.7 | ??22.8 | ??7.69 | ??50.7 | ??36.8 | ??27.42 |
| Cracking cement 1 | ??26.8 | ??23.9 | ??10.82 | ??52.6 | ??41.3 | ??21.48 |
| Cracking cement 2 | ??24.4 | ??22.7 | ??6.97 | ??49.8 | ??34.5 | ??30.72 |
Cracking cement intensity cleavage rate test is to carry out blanks and moulding and conserving by GB/T17671 Test method for strength of hydraulic cement mortar (ISO), maintenance to 3 day and put into after 28 days in 0 ℃～300 ℃ the numerical control analog platform case and carry out the temperature effect test, and test-results sees Table two.
Principle is as follows: cracking cement has a kind of composition CaCO
2And mineral such as sulfide and hydrotropy slag are when under the high temperature negative pressure state, chemical reaction can take place form another mineral, the wear resistance of this mineral hangs down 10% more normally, molten o'clock ought be under temperature action at 110 ℃～250 ℃, make this kind mineral half state of oxidation occur, make to make up the inner small cavity of appearance and strength degradation.The effect that the hydrotropy slag plays in cement slurry is, one with aquation after mineral in conjunction with generating the favourable humatite of cement mutually, two constraints that can overcome water molecules are adsorbed on cement particle surface by electrostatic attraction, help hydrotropy under the effect of temperature.What the sulphur slag played in cement at first is filling effect, do not chemically react, but in external cause (temperature, power) effect down, thus can absorb heat makes in the cement gypsum and ettringite cause local melt and expansion causes the loose of structure and cracking in the concrete body.
Cracking cement and benchmark 42.5PO cement physical properties comparing result table three
Cracking cement and the 42.5PO cement proportioning table four in the underground diaphragm wall concrete:
| Former proportioning | ??42.5PO | II level flyash | Breeze S95 | Medium sand | Rubble 5～25 | ??SPS-8P-1 |
| ??C30 | ??380 | ??36 | ??65 | ??840 | ??1038 | ??1.2％ |
| The cracking cement proportioning | Cracking cement | II level flyash | Breeze S95 | Medium sand | Rubble 5～25 | ??SPS-8P-1 |
| ??C30 | ??380 | ??36 | ??65 | ??840 | ??1038 | ??1.2％ |
The endurance test contrast in concrete of cracking cement and 42.5PO cement
Concrete impermeability contrast table five
Concrete shrinkage performance comparison table six
Creep of concrete performance comparison table seven
The inhibition contrast table eight of alkali-aggregate reaction
| Product | Cement mortar rate | 14 rate of expansion ratio |
| Benchmark 42.5PO cement | ??1∶2.25 | ??100 |
| Cracking cement | ??1∶2.25 | ??76.8 |
Normal concrete C30 test block cutting test operating mode table nine A
| Numbering | Normal concrete | Default thrust (T) | Default fltting speed (mm/min) | Default cutterhead rotating speed (rpm) | Propelling stroke (mm) | Cutterhead moment of torsion (oil pressure)/Mpa |
| ??1 | Plain concrete | ??2 | ??0.5 | ??1 | ??0～50 | ??4.3 |
| ??2 | Plain concrete | ??0.5 | ??1 | ??51～85 | ??4.4 | |
| ??3 | The glass concrete | ??0.5 | ??3 | ??86～116 | ??4.6 | |
| ??4 | Plain concrete | ??0.5 | ??2 | ??117～145 | ??4.7 | |
| ??5 | Plain concrete | ??0.5 | ??2 | ??146～185 | ??4.4 | |
| ??6 | Reinforcing bar | ??0.5 | ??3 | ??186～216 | ??4.7 | |
| ??7 | Plain concrete | ??0.5 | ??3 | ??217～245 | ??4.2 | |
| ??8 | Plain concrete | ??0.5 | ??3 | ??246～286 | ??4.7 |
Cracking cement concrete C30 test block cutting test operating mode table nine B
| Numbering | The cracking cement concrete | Default thrust (T) | Default fltting speed (mm/min) | Default cutterhead rotating speed (rpm) | Propelling stroke (mm) | Cutterhead moment of torsion (oil pressure)/Mpa |
| ??1 | Plain concrete | ??2 | ??0.5 | ??1 | ??0～50 | ??2.2 |
| ??2 | Plain concrete | ??2 | ??0.5 | ??1 | ??51～85 | ??2.3 |
| ??3 | The glass concrete | ??2 | ??0.5 | ??3 | ??86～116 | ??3.0 |
| ??4 | Plain concrete | ??2 | ??0.5 | ??2 | ??117～145 | ??2.4 |
| ??5 | Plain concrete | ??2 | ??0.5 | ??2 | ??146～185 | ??2.8 |
| ??6 | Reinforcing bar | ??2 | ??0.5 | ??3 | ??186～216 | ??3.0 |
| ??7 | Plain concrete | ??2 | ??0.5 | ??3 | ??217～245 | ??2.8 |
| ??8 | Plain concrete | ??2 | ??0.5 | ??3 | ??246～286 | ??2.1 |
Annotate: the cracking cement test situation, substitute wherein PO42.5 cement by original concrete formulation with cracking cement, composition concrete stone is gone up the simulation shield engine then and is tested, test-results shows, substitute the concrete of being formed behind the PO42.5 cement with cracking cement, under default thrust, default fltting speed, propelling stroke, default cutterhead rotating speed the same terms situation, its cutterhead moment of torsion oil pressure is obviously low than the concrete that PO42.5 cement is formed.
Claims (9)
1. cracking cement, it is characterized in that ingredients by weight per-cent is: cement clinker 50%～70%, flyash crystal 10%～15%, sulphur slag 5%～10%, desulfurated plaster 3%～6%, hydrotropy slag 1%～0.5%, Wingdale 5%～8%, the weight percent sum of above-mentioned each batching is 100%.
2. a kind of cracking cement according to claim 1 is characterized in that: 3 days intensity of cement clinker are greater than 28MPa, and intensity was greater than 58MPa in 28 days.
3. a kind of cracking cement according to claim 2 is characterized in that: the chemical ingredients of cement clinker is: SiO
2Be 20%～30%, Fe
2O
3Be 3%～6%, Al
2O
3Be 5%～10%, CaO is 55%～65%, and MgO is 1%～2%, and f-CaO is 0.5%～3.0%, SO
3Be 0.1%～0.5%.
4. a kind of cracking cement according to claim 2 is characterized in that: the mineral composition of cement clinker is: C
3S is 50%～60%, C
2S is 20%～30%, C
3A is 4%～10%, C
4AF is 10%～15%.
5. a kind of cracking cement according to claim 1 is characterized in that: flyash crystalline chemical ingredients is: SiO
2Be 30%～40%, Fe
2O
3Be 4%～9%, Al
2O
3Be 20%～30%, CaO is 3%～18%, and MgO is 0.5%～3.5%, TiO
2Be 0.1%～0.3%, Na
2O is 0.3%～0.8%, K
2O is 0.4%～0.9%, SO
3Be 0.8%～1.9%, f-CaO is 0.5%～3.0%.
6. a kind of cracking cement according to claim 1 is characterized in that: the chemical ingredients of sulphur slag is: the chemical ingredients of sulphur slag is: S is 30%～40%, SiO
2Be 20%～40%, Fe
2O
3Be 2.5%～4.5%, Al
2O
3Be 3%～9%, CaO is 2%～16%.
7. a kind of cracking cement according to claim 1 is characterized in that: the desulfurated plaster chemical ingredients is: SiO
2Be 3%～8%, Fe
2O
3Be 0.5%～1%, Al
2O
3Be 0.2%～1%, CaO is 30%～40%, and MgO is 0.5%～1%, SO
3Be 35%～50%.
8. a kind of cracking cement according to claim 1 is characterized in that: the Wingdale chemical ingredients is: SiO
2Be 2%～14%, Fe
2O
3Be 0.5%～13%, Al
2O
3Be 1%～13%, CaO is 45%～53%, and MgO is 0.5%～15%.
9. a kind of cracking cement according to claim 1 is characterized in that: hydrotropy dreg chemistry composition is: TFe is 5%～10%, and S is 0.5%～2%, and P is 0.5%～1%, and CuO is 30%～40%, and CaO is 5%～20%, and MgO is 1%～5%, Al
2O
3Be 10%～20%, SiO
2Be 2.0%～3.0%.。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810203896A CN101746973A (en) | 2008-12-02 | 2008-12-02 | Cracking cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810203896A CN101746973A (en) | 2008-12-02 | 2008-12-02 | Cracking cement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101746973A true CN101746973A (en) | 2010-06-23 |
Family
ID=42474668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810203896A Pending CN101746973A (en) | 2008-12-02 | 2008-12-02 | Cracking cement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101746973A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173612A (en) * | 2011-03-14 | 2011-09-07 | 广州市越堡水泥有限公司 | Slow-setting cement for highway roadbeds |
| CN102757189A (en) * | 2012-07-25 | 2012-10-31 | 大同煤矿集团有限责任公司 | Parameter proportion of slow setting cement for highway construction |
| CN114656179A (en) * | 2022-03-08 | 2022-06-24 | 云南凝创环保科技有限公司 | Method for preparing high-performance cementing material by negative-pressure anaerobic thermal cracking of phosphogypsum |
-
2008
- 2008-12-02 CN CN200810203896A patent/CN101746973A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173612A (en) * | 2011-03-14 | 2011-09-07 | 广州市越堡水泥有限公司 | Slow-setting cement for highway roadbeds |
| CN102173612B (en) * | 2011-03-14 | 2013-01-30 | 广州市越堡水泥有限公司 | Slow-setting cement for highway roadbeds |
| CN102757189A (en) * | 2012-07-25 | 2012-10-31 | 大同煤矿集团有限责任公司 | Parameter proportion of slow setting cement for highway construction |
| CN102757189B (en) * | 2012-07-25 | 2014-01-15 | 大同煤矿集团有限责任公司 | Parameter proportion of slow setting cement for highway construction |
| CN114656179A (en) * | 2022-03-08 | 2022-06-24 | 云南凝创环保科技有限公司 | Method for preparing high-performance cementing material by negative-pressure anaerobic thermal cracking of phosphogypsum |
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Open date: 20100623 |