CN102898050A - High-magnesium minimum-inflation low-heat cement and preparation method thereof - Google Patents
High-magnesium minimum-inflation low-heat cement and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-magnesium minimum-inflation low-heat cement and a preparation method thereof. A high-magnesium minimum-inflation low-heat cement clinker comprises the following mineral compositions in percentage by weight: 10-35% of C3S, 40-65% of C2S, 1-5% of C3A, 10-20% of C4AF and 6.0-8.0% of MgO. The concrete prepared by the cement has the characteristics of good liquidity, low water requirement amount, low hydration heat, high long-term strength, good durability and minimum inflation performance, and can be used for compensating the contraction of big-volume concrete and hydraulic concrete and reducing a concrete crack. Compared with the traditional portland cement and the low-heat portland cement, the high-magnesium minimum-inflation low-heat cement is more favorable for realizing the volume stability and the safety of the concrete, and is an ideal cementing material for the major projects, especially the big-volume concrete and hydraulic concrete engineering.
Description
Technical field
The present invention relates to a kind of cement, particularly relate to a kind of high-performance high-magnesium microdilatancy low heat cement and preparation technology thereof that can effectively reduce distress in concrete who can be used for the engineerings such as high performance concrete, mass concrete and concrete for hydraulic structure.
Background technology
Between 20 century 70 world energy sources climacterics, along with deepening constantly problem understanding such as Cement industry high energy gamma source resource consumption, carrying capacity of environment are relatively serious, caused the research boom first time of belite system cement, but therefore come to an end owing to failing to solve the stable and activation gordian technique of high belite cement; Study the great attention that climax starts from late 1980s international concrete project bound pair concrete durability the second time of belite system cement, energy-conservation, consumption reduction, environmental protection and further improve the direction that cement concrete performance becomes the international cement industrial sustainable development, the states such as Japan, Germany, Russia and India have all carried out the research and development of belite system cement.
In China, China Building Material Scientific Research General Institute was just set foot on the research and development journey of low-heat portland cement from 1996.From country's " 95 " emphasis program for tackling key problems in science and technology special topic project " research of concrete novel gelling material ", to country's " 15 " emphasis Key Technology Research and Development Program " exploitation of high belite cement and applied research ", arrive again and China Yangtse River Three Gorges Project Development Corporation's cooperation development " high belite cement is in the special applied research of concrete for hydraulic structure ", until national high-tech research evolutionary operation(EVOP) in 2006 (western action) special topic " research of low-heat cement for dam of high height above sea level extremely frigid zones ", whole project is lasted the time more than 10 years.The achievement in research of project " a kind of cement clinker and preparation technology thereof " and " a kind of low-heat portland cement and preparation thereof and application " obtain respectively national inventing patent (patent No. is ZL 98 1 00581.0, ZL 02 1 00189.8).
Although low-heat portland cement has aquation low-heat, the high excellent characteristics such as durable, but for mass concrete, owing to will emit heat in the cement hydration process in the concrete and liberated heat can not pass to the external world timely, therefore, have the process that a temperature rises first and then descends along with the prolongation in the length of time in the concrete.Mass concrete reached top temperature in 6～12 days usually after building, then be exactly the drop in temperature process that continues the long period, and this process duration can reach 3 months.In the process of drop in temperature, concrete can shrink that (concrete thermal expansivity is about 10 * 10
-6/ ℃), and generation string stress, when string stress just can produce shrinkage crack greater than concrete tensile strength the time, great threat has been caused to the safety of dam in the crack, therefore, how to reduce even eliminate the crack of concrete dam, be that numerous engineering technical personnel wish the difficult problem that solves always.
For this reason, studied and developed a kind of high-performance cement---high magnesium microdilatancy low heat cement that can be used for the engineerings such as high performance concrete, mass concrete and concrete for hydraulic structure and effectively reduce distress in concrete.
Summary of the invention
In the engineerings such as high performance concrete, mass concrete and concrete for hydraulic structure, easily produce the shortcoming of distress in concrete for solving existing cement, the purpose of this invention is to provide a kind of can generally produce in general cement mill, self hydration heat is low, contract with dry rate is low, resistance to fouling and wear resistance are good, particularly can improve the high magnesium microdilatancy low heat cement grog of resistance to cleavage in concrete works uses.
High magnesium microdilatancy low heat cement grog provided by the invention, its mineral composition is (weight percent): C
3S:10 ~ 35%, C
2S:40～65%, C
3A:1～5%, and C
4AF:10～20%; And in the above-mentioned cement clinker, MgO content is between 6.0～8.0%.
A preferred version, the mineral composition of described high magnesium microdilatancy low heat cement grog is (weight percent): C
3The S(tricalcium silicate) 11.83 ~ 31.35%, C
2The S(Dicalcium Phosphate (Feed Grade)) 44.08～64.04%, C
3The A(tricalcium aluminate) 1.63～3.36%, C
4The AF(tetracalcium aluminoferrite) 14.26～16.18%; MgO content is 6.47～7.91% in the cement clinker.
Another preferred version, the mineral composition of described high magnesium microdilatancy low heat cement grog is (weight percent): C
3The S(tricalcium silicate) 16.41 ~ 31.35%, C
2The S(Dicalcium Phosphate (Feed Grade)) 44.08～59.27%, C
3The A(tricalcium aluminate) 1.96～3.36%, C
4The AF(tetracalcium aluminoferrite) 14.26～16.18%; MgO content is 6.47～7.54% in the cement clinker.
Another preferred version, the mineral composition of described high magnesium microdilatancy low heat cement grog is (weight percent): C
3The S(tricalcium silicate) 27.66%, C
2The S(Dicalcium Phosphate (Feed Grade)) 48.04%, C
3The A(tricalcium aluminate) 2.79%, C
4The AF(tetracalcium aluminoferrite) 14.92%; MgO content is 6.71% in the cement clinker.
Described high magnesium microdilatancy low heat cement grog, the raw material ratio that generates described mineral composition is (weight percent): calcareous raw material 50～80%, clayey raw material 5～30%, iron powder 0～10%, industrial residue 0～40%, high magnesium limestone raw material 5～20%, and correction material 0～50%, wherein, iron powder, industrial residue and correction material are not 0 simultaneously.
Described calcareous raw material is one or more the combination in Wingdale, muddy limestone, the chalk; Described clayey raw material is one or more the combination in clay, flyash, red mud, coal gangue and the mine tailing; Described iron powder is iron ore powder, iron powder mine tailing; Described industrial residue is Copper Slag, sulfate slag, stone coal slag etc.; Described high magnesium limestone raw material is rhombspar, and Mg content is 15～40%; Described correction material is iron powder or sulfate slag class ferro-controlling raw material, quartzite, silica, yellow ground or the siliceous correction material of red sand class, and one or more the combination in the magnesia correction material of rhombspar class.
Concrete raw material ratio (weight percent) is preferably: Wingdale 65～80%, clay 5～18%, iron ore 2%, sulfate slag 0～4%, rhombspar 5～20% (MgO content is 15～40%), quartz sand 0～4%.
Another object of the present invention provides a kind of preparation method of above-mentioned high magnesium microdilatancy low heat cement grog.
The method comprises the steps necessary that the manufacture of cement starting material is produced cement clinker, and comprises and make content of magnesia in the cement clinker be controlled at step between 6.0～8.0%.
A present invention also purpose is to provide a kind of high magnesium microdilatancy low heat cement.This cement is aforementioned cement clinker and by SO in the cement clinker
3The mixture of 1.0～3.5% the gypsum class retardant that weight is calculated; The preferred dihydrate gypsum of described gypsum class retardant; The grinding fineness control ratio surface-area of described cement is 300～500m
2/ kg.
Still a further object of the present invention is to provide the preparation method of described high magnesium microdilatancy low heat cement.The method is equipped with gypsum class retardant with described high magnesium microdilatancy low heat cement grog, and intergrinding is to specific surface area 300～500m
2/ kg obtains; The volume of retardant is with SO in the cement
3Total amount is controlled, and scope is at 1.0～3.5%(weight percent).
The present invention provides respectively high magnesium microdilatancy low heat cement grog, cement and preparation method thereof with such scheme.When preparing this kind cement clinker except adopting general purpose portland cement production with the starting material, also can adopt various low-grade starting material, such as low-grade limestone and industrial residue, such as coal gangue, red mud, flyash, mine tailing and other waste residue etc., this cement is on the clinker mineral composition kind, identical with traditional silicate cement, all be by tricalcium silicate, Dicalcium Phosphate (Feed Grade), four kinds of mineral compositions of tricalcium aluminate and tetracalcium aluminoferrite, but wherein the content of Dicalcium Phosphate (Feed Grade) reaches 40～65%, magnesian content is between 6.0～8.0%, this high magnesium low-heat portland cement clinker aggregate through the calcining gained is allocated dissimilar retardant (dihydrate gypsum into, anhydrite or other industry by-product gypsum etc.), can make high magnesium microdilatancy low heat cement.Concrete by this cement has good fluidity, water requirement is low, hydration heat is low, later strength is high, good endurance, have the characteristics such as microdilatancy performance, and can be in order to compensate the contraction of mass concrete, concrete for hydraulic structure etc., reduce distress in concrete, more be conducive to realize concrete volume stability and security than traditional portland and low-heat portland cement.The present invention has the following advantages:
1, in the production of the high magnesium microdilatancy of the present invention low heat cement grog, the raw materials wide material sources can take full advantage of low grade material and various industrial residue, and production technique are simple, are applicable to all rotary kiln cement manufacturers.
2, the high magnesium microdilatancy low heat cement that is made by gained grog of the present invention is a kind of novel gelled material of resistance to cleavage excellence, come the contraction of compensating concrete by the delayed expansion that utilizes MgO, reduce distress in concrete, therefore be particularly suitable for the application of the engineerings such as mass concrete, concrete for hydraulic structure.
3, prepare high magnesium low-heat portland cement with the technology of the present invention, the characteristics such as have raw material sources wide (can take full advantage of industrial residue and low-grade starting material etc.), cost is lower, preparation technology is simple, can be widely used in the existing cement production enterprise production of China, therefore have good economic and social benefits.
In sum, high magnesium microdilatancy low heat cement of the present invention is a kind of novel gelled material that is more suitable for preparing high performance concrete than general purpose portland cement, its over-all properties is superior, it is the particularly desirable gelling material of mass concrete and concrete for hydraulic structure engineering etc. of priority project, its appearance will fill the domestic gaps, and market outlook and potentiality are wide.
Below in conjunction with specific embodiment the present invention is described in further details.
Embodiment
Provided by the present invention can be used for the engineering such as concrete for hydraulic structure and effectively reduce distress in concrete high-performance cement---high magnesium microdilatancy low heat cement is identical with traditional silicate cement, all be by tricalcium silicate, Dicalcium Phosphate (Feed Grade), four kinds of mineral compositions of tricalcium aluminate and tetracalcium aluminoferrite, content by the quality tricalcium silicate in its cement reaches 10 ~ 35%, the content of Dicalcium Phosphate (Feed Grade) reaches 40～65%, the content of tricalcium aluminate reaches 1 ~ 5%, the content of tetracalcium aluminoferrite reaches 10 ~ 20%, magnesian content (mean " greater than 6.0% less than 8.0% ") between 6.0～8.0% obtains high magnesium microdilatancy low heat cement grog through calcining.Allocate again dissimilar retardant (dihydrate gypsum, anhydrite or other industry by-product gypsum etc.) in this cement clinker into, can make high magnesium microdilatancy low heat cement.Concrete with this cement has good fluidity, water requirement is low, hydration heat is low, later strength is high, good endurance, have the characteristics such as microdilatancy performance, and can be in order to compensate the contraction of mass concrete, concrete for hydraulic structure etc., reduce distress in concrete, more be conducive to realize concrete volume stability and security than traditional portland and low-heat portland cement.
Specifically, high magnesium microdilatancy low heat cement grog provided by the present invention, its mineral composition is (weight percent): C
3The S(tricalcium silicate) 10 ~ 35%, C
2The S(Dicalcium Phosphate (Feed Grade)) 40～65%, C
3The A(tricalcium aluminate) 1～5%, C
4The AF(tetracalcium aluminoferrite) 10～20%; And in the above-mentioned cement clinker, MgO content is between 6.0～8.0%.
The high magnesium microdilatancy low heat cement grog of enumerating among the embodiment 1-5, its mineral composition is (weight percent): C
3The S(tricalcium silicate) 11.83 ~ 31.35%, C
2The S(Dicalcium Phosphate (Feed Grade)) 44.08～64.04%, C
3The A(tricalcium aluminate) 1.63～3.36%, C
4The AF(tetracalcium aluminoferrite) 14.26～16.18%; MgO content is 6.47～7.91% in the cement clinker.This scheme can be used as preferably.
The high magnesium microdilatancy low heat cement grog of enumerating among the embodiment 1-4, its mineral composition is (weight percent): C
3The S(tricalcium silicate) 16.41 ~ 31.35%, C
2The S(Dicalcium Phosphate (Feed Grade)) 44.08～59.27%, C
3The A(tricalcium aluminate) 1.96～3.36%, C
4The AF(tetracalcium aluminoferrite) 14.26～16.18%; MgO content is 6.47～7.54% in the cement clinker.This scheme can be used as more preferably.
The high magnesium microdilatancy low heat cement grog of enumerating among the embodiment 2, its mineral composition is (weight percent): C
3The S(tricalcium silicate) 27.66%, C
2The S(Dicalcium Phosphate (Feed Grade)) 48.04%, C
3The A(tricalcium aluminate) 2.79%, C
4The AF(tetracalcium aluminoferrite) 14.92%; MgO content is 6.71% in the cement clinker.This scheme can be used as most preferably.
Though the above concrete numerical value of having listed each preferred version according to table 2 is appreciated that institute's column data changes according to the variation that cement raw material forms in actual applications, floating of variation is normal value in ± 10% scope.
In the above-mentioned high magnesium microdilatancy low heat cement grog, the raw material ratio that generates described mineral composition is (weight percent): calcareous raw material 50～80%, clayey raw material 5～30%, iron powder 0～10%, industrial residue 0～40%, high magnesium limestone raw material 5～20%, and correction material 0～50%, wherein, iron powder, industrial residue and correction material are not 0 simultaneously.Described calcareous raw material is one or more the combination in Wingdale, muddy limestone, the chalk; Described clayey raw material is one or more the combination in clay, flyash, red mud, coal gangue and the mine tailing; Described iron powder is iron ore powder, iron powder mine tailing; Described industrial residue is one or more the combination in Copper Slag, sulfate slag, the stone coal slag etc.; Described high magnesium limestone raw material is rhombspar, and MgO content is 15～40%; Described correction material is iron powder or sulfate slag class ferro-controlling raw material, quartzite, silica, yellow ground or the siliceous correction material of red sand class, and one or more the combination in the magnesia correction material of rhombspar class.
Preferred version: in the above-mentioned high magnesium microdilatancy low heat cement grog, the raw material ratio that generates described mineral composition is (weight percent): Wingdale 65～80%, clay 5～18%, iron ore 2%, sulfate slag 0～4%, rhombspar 5～20% (MgO content is 15～40%), quartz sand 0～4%.Allocate 5% dihydrate gypsum in the cement clinker into and obtain high magnesium microdilatancy low heat cement.
According to technique scheme, after between MgO content in the cement clinker brought up to 6.0～8.0%, can give full play to the later stage microdilatancy performance of MgO, with the contraction of compensation mass concrete, reduce distress in concrete, thereby improve concrete volume stability and security.
Prepared high magnesium microdilatancy low heat cement grog is equipped with the different sorts gypsum and makes retardant, and intergrinding just can make high magnesium microdilatancy low heat cement to certain fineness, and the volume of retardant gypsum is with SO in the cement
3Total amount is controlled, and scope is at SO
31.0～3.5% of weight, the grinding fineness control ratio surface-area of cement is at 300～500m
2/ kg.
Embodiment implements under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Method therefor is ordinary method if no special instructions among the following embodiment.
Embodiment 1-5, the high magnesium microdilatancy low heat cement of preparation
The composition of raw materials of the high magnesium microdilatancy low heat cement of embodiment of the invention 1-5 is as shown in table 1:
Composition of raw materials (the unit: weight percent) of the high magnesium microdilatancy of table 1 low heat cement
Produce highly active high magnesium microdilatancy low heat cement grog with ordinary method on φ 2.5 * 45m five-stage cyclone preheater kiln, grog is tiny all neat, and the knot grain is good, without powder phenomenon-tion; This grog is equipped with gypsum makes retardant, produce high magnesium microdilatancy low heat cement.
Chemical analysis, rate value and the mineral composition of the cement clinker of embodiment 1-5 preparation and contrast cement see Table 2.
Chemical analysis, rate value and the mineral composition of the high magnesium microdilatancy of table 2 low heat cement grog
| ? | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | SO 3 | KH | SM | IM | C 3S | C 2S | C 3A | C 4AF |
| Embodiment 1 | 23.64 | 4.34 | 4.82 | 60.71 | 6.47 | 0.05 | 0.78 | 2.58 | 0.90 | 31.35 | 44.08 | 3.36 | 14.66 |
| Embodiment 2 | 24.13 | 4.18 | 4.90 | 60.49 | 6.71 | 0.04 | 0.77 | 2.65 | 0.85 | 27.66 | 48.04 | 2.79 | 14.92 |
| Embodiment 3 | 24.56 | 4.20 | 4.69 | 59.54 | 7.11 | 0.05 | 0.74 | 2.76 | 0.90 | 20.74 | 54.74 | 3.20 | 14.26 |
| Embodiment 4 | 25.00 | 4.14 | 5.32 | 59.41 | 7.54 | 0.04 | 0.73 | 2.64 | 0.78 | 16.41 | 59.27 | 1.96 | 16.18 |
| 5 | 25.46 | 4.01 | 5.32 | 58.95 | 7.91 | 0.04 | 0.71 | 2.72 | 0.75 | 11.83 | 64.04 | 1.63 | 16.17 |
| PC | 22.61 | 3.93 | 3.44 | 64.69 | 1.15 | 0.07 | 0.91 | 2.90 | 1.21 | 56.98 | 22.16 | 4.57 | 10.47 |
| MH | 21.87 | 3.93 | 5.16 | 62.68 | 4.30 | 0.03 | 0.87 | 2.41 | 0.76 | 52.83 | 23.15 | 1.66 | 15.69 |
| Comparative Examples | 23.32 | 4.65 | 5.58 | 58.33 | 6.00 | 0.03 | 0.75 | 2.28 | 0.83 | 22.15 | 50.20 | 2.86 | 16.96 |
Annotate: MH is moderate-heat portland cement, and PC is general purpose portland cement.Both are contrast cement.
The performance test of the high magnesium low-heat portland cement of embodiment 1-5, Comparative Examples preparation and contrast cement is as follows:
1, strength property
Embodiment 1-5 and comparative example gained grog and gypsum intergrinding to specific surface area are about 360m
2/ Kg carries out the physical property test (with reference to GB/T 17671-1999 Test method for strength of hydraulic cement mortar (ISO method)) of cement, the results are shown in Table 3.From the result as seen, silicate cement (PC) and moderate-heat portland cement (MH) early hydration speed are fast, general cement 7d intensity can reach 60～80% of its 28d intensity, and high magnesium microdilatancy low heat cement (LH[HM]) because take the belite mineral as main, the early hydration activity is relatively low, 7d intensity is about 40～60% of its 28d intensity, and the later intensity enhancement rate of 7d is apparently higher than PC and MH, to 28d during the length of time intensity suitable with PC, MH.3m～1y is during the length of time, and high magnesium microdilatancy low heat cement intensity exceeds approximately 10～15MPa of PC, MH, shows good longterm strength performance.
The physicals result of the high magnesium microdilatancy of table 3 low heat cement
Annotate: MH is moderate-heat portland cement, and PC is general purpose portland cement, the high magnesium microdilatancy low heat cement of LH (HM) 1-5 corresponding embodiment 1-5 preparations.Comparative Examples cement data are referring to table 2.
2, hydration heat
Detect with reference to the hydration heat of GB/T 17671-1999 Test method for strength of hydraulic cement mortar (ISO method) to the high magnesium microdilatancy of embodiment 1-5 low heat cement, the results are shown in Table 4.By table 4 result as seen, LH (HM) is lower by approximately 15% than MH at the hydration heat of different hydration ages, and is lower by 20～30% than PC hydration heat, shows that high magnesium microdilatancy low heat cement of the present invention is a kind of low-heat, high-strength and high performance cement.
The measured value (kJ/kg) of the hydration heat in three kinds of cement of table 4 different length of times
Annotate: MH is moderate-heat portland cement, and PC is general purpose portland cement, the high magnesium microdilatancy low heat cement of LH (HM) 1-5 corresponding embodiment 1-5 preparations.
3, shrinkage performance
The drying shrinkage test of cement is undertaken by JC/T603-2004 " cement mortar dry shrinkage test method ", and test-results sees Table 5.Test-results shows, the contract with dry rate of the high magnesium microdilatancy of the present invention low heat cement is lower than general purpose portland cement, the contract with dry rate in each length of time is 50%～70% of general purpose portland cement, on the other hand, the drying shrinkage of high magnesium microdilatancy low heat cement is shorter stationary phase, contract with dry rate behind the 28d is substantially unchanged, and this shows that high magnesium microdilatancy low heat cement of the present invention has the dry shrinkage resistance energy that is better than general purpose portland cement.
Table 5 cement mortar contract with dry rate test-results
| Cement type | 7d | 14d | 28d | 3m | 6m |
| PC | 0.058 | 0.083 | 0.103 | 0.115 | 0.096 |
| LH(HM)1 | 0.035 | 0.047 | 0.062 | 0.064 | 0.069 |
| LH(HM)2 | 0.034 | 0.045 | 0.060 | 0.062 | 0.065 |
| LH(HM)3 | 0.032 | 0.043 | 0.059 | 0.061 | 0.064 |
| LH(HM)4 | 0.030 | 0.042 | 0.058 | 0.060 | 0.063 |
| LH(HM)5 | 0.029 | 0.040 | 0.058 | 0.059 | 0.062 |
Annotate: PC is general purpose portland cement, the high magnesium microdilatancy low heat cement of LH (HM) 1-5 corresponding embodiment 1-5 preparations.
4, expansion character
The swelling rate test of cement is undertaken by JC/T313-2009 " expansive cement swelling rate test method ", and test-results sees Table 6.Test-results shows that high magnesium microdilatancy low heat cement has good expansion character with respect to general purpose portland cement, and along with the clean rate of expansion of the increase cement of content of magnesia in the cement increases, expansion character is obviously stable in the time of between content of magnesia concentrates on 6%～8% in the cement, and is comparatively desirable.
The clean swelling rate test result of table 6 cement
| Cement type | 1d | 3d | 7d | 14d | 28d |
| PC | 0.006 | 0.011 | 0.016 | 0.019 | 0.023 |
| LH(HM)1 | 0.022 | 0.031 | 0.043 | 0.057 | 0.069 |
| LH(HM)2 | 0.023 | 0.032 | 0.045 | 0.059 | 0.070 |
| LH(HM)3 | 0.023 | 0.031 | 0.044 | 0.058 | 0.069 |
| LH(HM)4 | 0.024 | 0.032 | 0.046 | 0.060 | 0.071 |
| LH(HM)5 | 0.025 | 0.033 | 0.046 | 0.061 | 0.072 |
| Comparative Examples | 0.015 | 0.023 | 0.031 | 0.042 | 0.054 |
Annotate: PC is general purpose portland cement, the high magnesium microdilatancy low heat cement of LH (HM) 1-5 corresponding embodiment 1-5 preparations.The Comparative Examples cement composition sees Table 2.
5, cracking of reinforced concrete
Because high magnesium microdilatancy low heat cement (LH (HM)) is very suitable for the engineerings such as concrete for hydraulic structure, mass concrete, therefore (moderate-heat portland cement, MH) concrete contrasts with high magnesium low-heat portland cement concrete and cement for dam.
According to theoretical investigation and a large amount of test result analysis, the Volume Concrete Cracks major part is to be subject to basis or inner concrete constraint and the crack that produces in temperature-fall period, take into full account the characteristics such as elasticity, plasticity, viscosity of concrete material, propose concrete crack resistance from the angle of strain and can consider as follows:
The distortion of concrete tension refers to the tensile deformation that concrete itself can bear in the formula, comprises that the utmost point draws distortion, creeps, certainly becomes and drying shrinkage, and concrete shrinkage deformation refers to the temperature contraction distortion that produces in the temperature-fall period.This concept is mainly done relatively from the material angle, and tear factor R both can be used as base concrete, also can be used for outside cracking of reinforced concrete relatively.
Wherein, ε
a=k
1* concrete instantaneous deformation (ultimate elongation)+k
2* creep deformation-k
3* autogenous volumetric deformation-k
4* dry-shrinkage deformed
ε
b=k
5* concrete temperature contraction distortion coefficient k
1, k
2, k
3, k
4, k
5The weight coefficient (%) of expression corresponding deformation.
This expression formula from the physical conception categorical analysis favourable distortion and the unfavorable distortion the concrete cooling process, can be used to the resistance to cleavage of relative evaluation concrete material, namely the R value is larger, concrete splitting resistance is relatively better.
In actual concrete works, instantaneous deformation is maximum to concrete crack resistance contribution, and the creep deformation performance is taken second place, the impact of autogenous volumetric deformation, drying shrinkage is less, and is particularly dry-shrinkage deformed, as long as the maintenance measure that adopts is proper, its impact can be ignored, therefore get coefficient k
1, k
2, k
3, k
4The weight of expression is respectively 80%, 15%, 4%, 1%.Secondly, because concrete the scattering and disappearing of heat in casting process, inside concrete is generally 60% of thermal insulation warming, therefore get coefficient k
5Be 0.6.According to statistical information, getting concrete linear expansivity is 8.5 * 10
-6/ ℃, therefore by formula calculate the results are shown in Table 7.
Calculation result shows, in the different length of times, the concrete tension deformation epsilon of LH (HM)
aAll greater than the MH concrete, and temperature contraction distortion ε
bAll less than the MH concrete, therefore its tear factor R is all greater than the MH concrete.This calculating illustrates that also the concrete relative crack resistance of LH (HM) is more excellent than MH concrete on physical conception.
The concrete tear factor R of table 7 LH (HM) and MH
Annotate: MH is moderate-heat portland cement, and PC is general purpose portland cement, the high magnesium microdilatancy low heat cement of the corresponding embodiment 1-5 preparation of LH (HM) 1-5.
To sum up, high magnesium microdilatancy low heat cement provided by the invention and preparation technology thereof have following features:
1. the mineral composition of high magnesium microdilatancy low heat cement grog is by C
3S, C
2S, C
3A and C
4AF forms, and (means " greater than 6.0%～less than 8.0% ") between wherein MgO content is controlled at 6.0%～8.0%, has broken through the restriction of national standard 6.0%, is intended to utilize the delayed expansion of MgO to come the contraction of compensating concrete, reduces distress in concrete.
2. produce the used raw-material scope of high magnesium microdilatancy low heat cement very extensive, can extensively utilize low-grade limestone, coal gangue, red mud, flyash, mine tailing, waste residue etc.
3. the modulus control scope of producing high magnesium microdilatancy low heat cement is: the KH(saturation ratio)=0.70～0.82, and SM(silicon rate)=2.0～3.0, IM(aluminium rate)=0.80～1.50.
4. the firing process parameter that is complementary with high magnesium microdilatancy low heat cement grog: 1. Stabilizing Materials layer thickness and feeding capacity, the rational Match of accomplishing wind, coal, material; 2. should guarantee that flame is submissive strong during calcination operation, avoid short-flame anxious burn and kiln in the appearance of reducing atmosphere, and can suitably improve the fast and kiln unit-hour output of kiln; 3. strictly control the knot grain situation of grog; 4. strictly control the clinker discharging liter and weigh and free calcium oxide content, should take appropriate measures simultaneously, strengthen the cooling of grog.
Claims (10)
1. high magnesium microdilatancy low heat cement grog, its mineral composition is (weight percent):
C
3S：10~35%
C
2S：40～65％，
C
3A:1～5%, and
C
4AF：10～20％；
And in the above-mentioned cement clinker, MgO content is between 6.0～8.0%.
2. high magnesium microdilatancy low heat cement grog according to claim 1, it is characterized in that: described high magnesium microdilatancy low heat cement clinker mineral composition is (weight percent): C
3The S(tricalcium silicate) 11.83 ~ 31.35%, C
2The S(Dicalcium Phosphate (Feed Grade)) 44.08～64.04%, C
3The A(tricalcium aluminate) 1.63～3.36%, C
4The AF(tetracalcium aluminoferrite) 14.26～16.18%; MgO content is 6.47～7.91% in the cement clinker.
3. high magnesium microdilatancy low heat cement grog according to claim 1 and 2, it is characterized in that: described high magnesium microdilatancy low heat cement clinker mineral composition is (weight percent): C
3The S(tricalcium silicate) 16.41 ~ 31.35%, C
2The S(Dicalcium Phosphate (Feed Grade)) 44.08～59.27%, C
3The A(tricalcium aluminate) 1.96～3.36%, C
4The AF(tetracalcium aluminoferrite) 14.26～16.18%; MgO content is 6.47～7.54% in the cement clinker.
4. according to claim 1 and 2 or 3 described high magnesium microdilatancy low heat cement grogs, it is characterized in that: described high magnesium microdilatancy low heat cement clinker mineral composition is (weight percent): C
3The S(tricalcium silicate) 27.66%, C
2The S(Dicalcium Phosphate (Feed Grade)) 48.04%, C
3The A(tricalcium aluminate) 2.79%, C
4The AF(tetracalcium aluminoferrite) 14.92%; MgO content is 6.71% in the cement clinker.
5. according to claim 1 to 4 arbitrary described high magnesium microdilatancy low heat cement grogs, it is characterized in that: the raw material ratio that generates described mineral composition is (weight percent):
Calcareous raw material 50～80%,
Clayey raw material 5～30%,
Iron powder 0～10%,
Industrial residue 0～40%,
High magnesium limestone raw material 5～20%, and
Correction material 0～50%,
Wherein, iron powder, industrial residue and correction material are not 0 simultaneously.
6. high magnesium microdilatancy low heat cement grog according to claim 5 is characterized in that: described calcareous raw material is one or more the combination in Wingdale, muddy limestone, the chalk; Described clayey raw material is one or more the combination in clay, flyash, red mud, coal gangue and the mine tailing; Described iron powder is iron ore powder, iron powder mine tailing; Described industrial residue is Copper Slag, sulfate slag, stone coal slag etc.; Described high magnesium limestone raw material is rhombspar, and Mg content is 15～40%; Described correction material is iron powder or sulfate slag class ferro-controlling raw material, quartzite, silica, yellow ground or the siliceous correction material of red sand class, and one or more the combination in the magnesia correction material of rhombspar class.
7. it is characterized in that according to claim 5 or 6 described high magnesium microdilatancy low heat cement grogs:
Concrete raw material ratio (weight percent) is: Wingdale 65～80%, clay 5～18%, iron ore 2%, sulfate slag 0～4%, rhombspar 5～20% (MgO content is 15～40%), quartz sand 0～4%.
8. method for preparing each described high magnesium microdilatancy low heat cement grog of claim 1-4, comprise the steps necessary that the manufacture of cement starting material is produced cement clinker, and comprise and make content of magnesia in the cement clinker be controlled at step between 6.0～8.0%.
9. one kind high magnesium microdilatancy low heat cement is characterized in that, for the arbitrary described cement clinker of claim 1 to 7 with the mixture of 1.0～3.5% the gypsum class retardant of pressing that SO3 weight in the cement clinker calculates; The preferred dihydrate gypsum of described gypsum class retardant; The grinding fineness control ratio surface-area of described cement is 300～500m
2/ kg.
10. the preparation method of the described high magnesium microdilatancy low heat cement of claim 9, it is characterized in that: the arbitrary described high magnesium microdilatancy low heat cement grog of claim 1 to 7 is equipped with gypsum class retardant, and intergrinding is to specific surface area 300～500m
2/ kg obtains; The volume of retardant is with SO in the cement
3Total amount is controlled, and scope is at 1.0～3.5%(weight percent).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041560A (en) * | 2003-09-17 | 2007-09-26 | 中国建筑材料科学研究院 | High-magnesium low-heat portland cement clinker aggregate and preparation method thereof |
| CN101353231A (en) * | 2008-08-01 | 2009-01-28 | 湖南石门特种水泥有限公司 | High-magnesium moderate-heat portland cement and production method thereof |
| CN101781096A (en) * | 2010-01-22 | 2010-07-21 | 中材天山(云浮)水泥有限公司 | Method for producing cement by utilizing high-silicon low-calcium limestone |
| CN102173700A (en) * | 2010-12-31 | 2011-09-07 | 四川嘉华企业（集团）股份有限公司 | Minimum inflation low heat silicate cement |
-
2012
- 2012-10-22 CN CN201210403083.XA patent/CN102898050B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041560A (en) * | 2003-09-17 | 2007-09-26 | 中国建筑材料科学研究院 | High-magnesium low-heat portland cement clinker aggregate and preparation method thereof |
| CN101353231A (en) * | 2008-08-01 | 2009-01-28 | 湖南石门特种水泥有限公司 | High-magnesium moderate-heat portland cement and production method thereof |
| CN101781096A (en) * | 2010-01-22 | 2010-07-21 | 中材天山(云浮)水泥有限公司 | Method for producing cement by utilizing high-silicon low-calcium limestone |
| CN102173700A (en) * | 2010-12-31 | 2011-09-07 | 四川嘉华企业（集团）股份有限公司 | Minimum inflation low heat silicate cement |
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