CN104926160A - Preparation method for high-performance cement - Google Patents
Preparation method for high-performance cement Download PDFInfo
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- CN104926160A CN104926160A CN201510397943.7A CN201510397943A CN104926160A CN 104926160 A CN104926160 A CN 104926160A CN 201510397943 A CN201510397943 A CN 201510397943A CN 104926160 A CN104926160 A CN 104926160A
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Abstract
The invention relates to a preparation method for high-performance cement. Magniferous carbonate rocks such as dolomite and magnesite, portland cement clinker, gypsum, cement mixtures, alkali-activators and the like are levigated according to a certain proportion to particle sizes of general purpose portland cement, namely the high-performance cement is prepared, and compared with the general purpose portland cement, the high-performance cement has the advantages that higher anti-permeability, freezing resistance and anti-carbonization is achieved, and good volume stability is achieved. According to the cement, the manufacturing technique is simple, all durability indexes of a cement product are improved, the cost is low, and therefore the wide popularization and application market is obtained.
Description
Technical field:
The present invention relates to a kind of preparation method of high-performance cement, especially admixture is containing the preparation method of the high-performance cement of magnesium carbonate rock.
Background technology:
Many cement concretes stand wind, Exposure to Sunlight throughout the year, drench with rain and air, water, all kinds of erosion medium resistance in soil cause damage, therefore except requiring that concrete and cement products should have except enough intensity, also should have the ability that opposing external environment is damaged it, namely good impermeability, frost resistance, anti-carbonization and good volume stability etc.
Alkali-carbonate reaction is also one of reason affecting concrete works security, since over half a century, all therefore many hydro projects, railway, highway, bridge, tunnel and industry and covil construction are destroyed, alkali is also called concrete " cancer ", and how preventing the alkali-carbonate reaction of one of alkali to endanger is still the main task of current various countries concrete researcher.
Produce uneven volumetric expansion because alkali-aggregate reaction damages concrete reason, and cement after hydration and hardening through often there is volumetric shrinkage, cement products is made easily to occur various defect, contriver makes the best use of the situation, the objective law of the volumetric expansion utilizing alkali-carbonate reaction to produce, namely the alkali in cement and exogenously added alkali and rhombspar is utilized to react the characteristic producing even volumetric expansion, and reaction proceeds to then stop certain length of time expanding, and then achieve the object of the performance such as impervious improving concrete and cement products, now obtain patent of invention " preparation method of rhombspar composite blend and application " (ZL2013 1 03011404.X).Find after further study, it is react containing the magnesiumcarbonate in magnesium carbonate rock and the hydroxide ion in environment solution to generate magnesium hydroxide and cause that the essence of volumetric expansion occurs.
Does so contriver associates, whether pure other also have this kind of function containing magnesium carbonatite since the essence producing volume of concrete expansion is caused by magnesiumcarbonate and alkali substance reaction?
This imagination by the experiment show continued, namely the essence that alkali-carbonate reaction produces expansion function mainly forms in calcium hydroxide aqueous solution containing magnesium carbonate rock that magnesium hydroxide colloidal causes, both all have this function containing magnesium carbonate rock, in order to the object reasonably using this principle to reach the endurance quality improving cement, carry out the experimental study directly mixed when silicate cement is produced containing magnesium carbonate rock.
Containing magnesium carbonate rock except white clouds rock salt, the carbonatite of nature also containing magnesiumcarbonate is magnesite, through investigation China magnesite rich reserves, according to second place of the world, mainly be distributed in the ground such as Liaoning, Qinghai, Xinjiang, Shandong, wherein maximum with Liaoning reserves, account for 85.6% of national total reserves.These promotion and implementation being the present invention technology provide material guarantee, particularly in part magnesite because of containing small amounts iron or quartz etc. impurity, be not suitable for preparing refractory materials, therefore much such mineral wealth are stacked by as mine tailing, and not only occupying cultivated land also can to environment.But use can not produce detrimentally affect as starting material of the present invention.
With rhombspar and cement for keyword retrieval, the patent of invention that discovery 13 is relevant to cement and rhombspar altogether, " binding cement " application number: 961048204, " microdilatancy, waterproof, anti-cracking color cement " application number: 951107194, " a kind of preparation method of normal temperature maintenance compound single-component alkali-excited cement " application number: 2014107667463, " a kind of magnesia oxychloride cement " application number: 2014106827060, " a kind of anti-freezing type magnesia oxychloride cement and preparation method thereof and should " application number: 2014107269447, " a kind of by bischofite and dolomite for magnesium cement method of magnesium oxide " application number: 2011103423837, " white cement for plastering of wall " application number: 961048212, " preparation for water cement that is adiabatic and heat reflection product gathers materials " application number: 2009801365946, " a kind of light-burned dolomite cement " application number: 201010551895X, " a kind of aluminate cement containing nano magnalium spinel and preparation method thereof " application number: 201510010803X, above 10 all need to carry out calcination processing therefore unrelated to the invention to rhombspar." inorganic cementitious material " application number: 998141518, what introduce is not Silicate Rocks cement, is not more high-performance cement, also unrelated to the invention, " white aluminosulfate cement and preparation method thereof " rhombspar only uses, so also have nothing to do with the present invention as a kind of filler of white cement.Wherein have with the present invention necessarily contact to be application number be 941022218 invention " high-performance water-proof cement and manufacture method thereof ", this invention is in basic raw material at silicate cement or aluminate cement, add ground dolomite, zinc stearate, Sodium Silicofluoride, the water-proofing powder masterbatch of silica flour and wooden calcium sulfonate's composition, therefore from high-performance cement prepared by the present invention be also exist essence different, one, it is the difference of mechanism, this invention is mainly through adding water-proofing powder masterbatch, cement is had object that certain hydrophobicity performance reaches waterproof, and the object that the present invention is expansion that the alkali-aggregate reaction occurred by rhombspar and alkali produces makes cement products densification reach impervious, two, that volume is different, its the rhombspar volume upper limit is lower limit of the present invention, three, it is the difference of making method.Four, be the difference formed, namely also need to add the water-proofing powder masterbatch be made up of zinc stearate, Sodium Silicofluoride, silica flour and wooden calcium sulfonate except rhombspar.
National patent retrieval is carried out as keyword using magnesite and cement composition, check in 5 patents of invention altogether, but all have basic different from patented technology of the present invention, patent CN103180260A " method for the production of the cement composition containing magnesium ", is used after needing that magnesite is added the materials such as thermogenesis magnesium oxide again; Patent CN1112084, " Ceramo-steel and application thereof ", although produce with cement production process similar, do not relate to silicate cement and concrete character; Patent CN102531526A, " magnesite slag high-strength footpath brick " magnesite slag are the mine tailings after magnesium is refined in industry, are not magnisites; Patent CN1096279, " a kind of magnesia cement and preparation technology thereof ", introduce and magnesite sintered into grog and add gypsum, kaolin etc. and make cement.And this patent is incorporated into by magnesite in silicate cement to improve its endurance quality, the patent 201310003119.X testing method of content of magnesia " in the MgO expansion agent " is then the testing method introducing content of magnesia, has nothing to do especially with the technology of the present invention.
The invention provides a kind of preparation method of high-performance cement, namely adopt and mix containing magnesium carbonate rock (rhombspar in cement, magnesite etc.) prepare the good silicate cement of weather resistance, the mechanism that can improve cement durability is: magnesiumcarbonate can micro dissolution in basic solution, separates out the lower Mg (OH) of solubleness through aquation
2crystal and brucite, the microcrystal (or colloid) of brucite, what the microporosity of Behavior of Hardened Cement Paste can be made to fill is more closely knit, increases the resistance of Behavior of Hardened Cement Paste to liquid-flow, because brucite colloid has huge specific surface area and good wetting ability, so can Preferential adsorption OH
-ion makes brucite colloid electronegative, and the hydration gegenion in water molecules and solution can be strapped in colloid flucculation structure, at this moment the water in glue hole is no longer the free water of common character, but the planar water that water molecules arranged opposite is orderly, foundation physical chemistry rudimentary knowledge is known, and " kapillary is thinner, the principle that in kapillary, the freeze point depression of water is larger ", and containing Na+, the freezing point of the cationic solutions such as K+ can be lower reason, even if also can not freeze under making the water in cement products endoporus be in low temperature environment, and then improve the impervious of concrete and cement products, freeze proof and anti-carbonation properties, the volumetric expansion that alkali one carbonate reaction is formed also add the volume stability of cement products, thus the problem that the weather resistance to some extent solving general purpose portland cement is low.
Summary of the invention:
The present invention can solve current general common silicate cement weather resistance problem on the low side, particularly low cost can provide a kind of preparation method of high-performance cement.
The object of the invention is to be achieved through the following technical solutions:
A preparation method for high-performance cement, is characterized in that, comprises the following steps:
A, prepare high-performance cement of the present invention time, by rhombspar or magnesite or their mixture (namely containing magnesium carbonate rock) and Portland clinker, gypsum, containing the levigate granularity to general purpose portland cement together with alkali salt (as sodium sulfate, water glass etc.) and cement mixture (as slag, flyash etc.), be prepared into high-performance cement; Or by rhombspar or magnesite or their mixture (namely containing magnesium carbonate rock) separate grinding to the powder thinner than silicate cement fineness, then be spiked into stir in general purpose portland cement and be prepared into high-performance cement.
B, to mix rhombspar or magnesite or their mixture (namely containing magnesium carbonate rock) in the ratio accounting for silicate cement quality 2%-11%, according to the equivalent sodium oxide quantity that cement contains, various containing alkali salt by suitably adding, here preferably select sodium sulfate and water glass, control the equivalent sodium oxide of silicate cement between 0.8-1.8%.
Specific experiment:
Starting material: experiment adopts Haicheng to produce magnesite tailings, knows that the magnesiumcarbonate massfraction in this ore deposit is 96% by analysis.Dolomite originates from Shandong, detects be confirmed to be dolomite through chemical constitution and mineral composition.
Liaoyuan, cement clinker source Buddha's warrior attendant Cement Group, cement clinker 3 days intensity 27.6MPa, 28 days intensity 57.6MPa, the equivalent alkali content 1.2% of cement clinker.Gypsum originates from Tonghua, Jilin Province city Liuhe, SO
3content 25%.Flyash Changchun thermoelectricity two factory, slag powders Tong-Hua Steel Factory factory produces.
Cement is prepared by table 1 cement ingredient list.
According to existing general purpose portland cement quality inspection standard to preparing the intensity of cement, time of coagulation, stability carry out detecting appraisal, concrete outcome is in table 2
Cement ingredient list (%) tested by table 1
Table 2 hydraulicity quality detection result
Table 3 cement mortar test specimen swell increment detected result in time (unit mm)
The high-performance cement obtained by above-mentioned technique and Portland cement mixing cement concrete, the C30 concrete mix prepared with 42.5 cement is: C: S: G=1: 2.56: 3.1, W/C=0.52, cement consumption 325kg naphthalene water reducer (powder) 1.4%.
The C20 concrete mix prepared with 32.5 cement is: C: S: G=1: 2.07: 4.1, W/C=0.57, cement consumption 302kg, naphthalene water reducer (powder) 1.4%.
The freeze thawing of table 4 agent on crack resistance of concrete is tested
Table 5 agent on crack resistance of concrete carbonation depth mm
Table 6 concrete impermeability test (units MPa)
As can be seen from above-mentioned experimental result, with the concrete of high-performance cement mixing and mortar, all there is good weather resistance.With X-ray diffraction analysis, in the glue sand test specimen of maintenance in 28 water, rhombspar and the equal aquation of magnesite completely, be can't see the characteristic peak of its diffraction completely, can be confirmed to define Mg (OH) 2 with scanning electron microscope and energy spectrum analysis.
Embodiment 1 water-tight concrete simultaneous test:
C30P6 pumping water-tight concrete basis (blank) proportioning: common Portland PO42.5 strength rating cement, cement consumption is 325kg, medium sand 835kg, rubble 5 ~ 31.5mm particle diameter 1010kg, water 170kg, naphthalene water reducer 9kg.Within 28 days, the actual seepage-resistant grade that detects reaches P8 requirement.
C30P6 pumping water-tight concrete test proportioning: P.O42.5*b high-performance cement 325kg, sand 835kg, rubble 5 ~ 31.5mm particle diameter 1010kg, water 170kg, naphthalene water reducer 9kg.Within 28 days, actual seepage-resistant grade reaches P14 requirement.
C30P6 pumping water-tight concrete test proportioning: P.O42.5*1 high-performance cement 325kg, sand 835kg, rubble 5 ~ 31.5mm particle diameter 1010kg, water 170kg, naphthalene water reducer 9kg.Within 28 days, actual seepage-resistant grade reaches P18 requirement.
Embodiment 2 frost-resistant concrete simultaneous test:
C30F100 pumping frost-resistant concrete basis (blank) proportioning: common Portland PO42.5 strength rating cement, cement consumption is 325kg, medium sand 835kg, and ballast grain sizes is (5mm ~ 31.5mm) 1010kg, water 160kg, naphthalene water reducer 9.5kg.Make 100 × 100 × 100mm cubes concrete sample, after normal curing in 28 days, concrete sample actual detection freeze-thaw-reach 100 times qualified.
C30F100 pumping frost-resistant concrete test proportioning: P.O42.5*b high-performance cement, cement consumption 325kg, sand 835kg, ballast grain sizes (5mm ~ 31.5mm) 1010kg, water 160kg, naphthalene water reducer 9.5kg.After normal curing in 28 days, concrete actual detection freeze-thaw-reaches 150 times.Qualified
C30F100 pumping frost-resistant concrete test proportioning: P.O42.5*1 high-performance cement, cement consumption 325kg, sand 835kg, ballast grain sizes (5mm ~ 31.5mm) 1010kg, water 160kg, naphthalene water reducer 9.6kg.After normal curing in 28 days, concrete actual detection freeze-thaw-reaches 200 times.Qualified
The anti-carbonated concrete of embodiment 3:
C20 concrete benchmark (blank) proportioning: PC32.5 general purpose portland cement, alkaline content of cement 1.2%, cement consumption is 302kg, rubble (5-31.5mm) 1238kg, sand 625kg water 175kg, naphthalene water reducer 9.1kg.28 days through the average carbonation depth 9.3mm of the actual detection of standard silicon carbide case carbonization experiment.
C20 concrete test proportioning: P.C32.5*b high-performance cement, cement consumption 302kg, sand 625kg, rubble (5-31.5mm) 1238kg, water 175kg, naphthalene water reducer 9.1kg.28 days through the average carbonation depth 5.4mm of the actual detection of standard silicon carbide case carbonization experiment.
C20 concrete test proportioning: P.O32.5*1 high-performance cement, cement consumption 302kg, sand 625kg, rubble (5-31.5mm) 1238kg, water 175kg, naphthalene water reducer 9.1kg.28 days through the average carbonation depth 5.9mm of the actual detection of carbonization case carbonization experiment.
Embodiment 4 water-tight concrete:
C20 concrete benchmark (blank) proportioning: PC32.5 general purpose portland cement, alkaline content of cement 1.2%, cement consumption is 302kg, rubble (5-31.5mm) 1238kg, sand 625kg water 170kg, naphthalene water reducer 9.1kg.Within 28 days, the actual seepage-resistant grade that detects reaches P6 requirement.
C20 concrete test proportioning: P.C32.5*b high-performance cement, cement consumption 302kg, sand 625kg, rubble (5-31.5mm) 1238kg, water 170kg, naphthalene water reducer 9.2kg.Within 28 days, the actual seepage-resistant grade that detects reaches P12 requirement.
C20 concrete test proportioning: P.C32.5*1 high-performance cement, cement consumption 302kg, sand 625kg, rubble (5-31.5mm) 1238kg, water 170kg, naphthalene water reducer 9.2kg.Within 28 days, the actual seepage-resistant grade that detects reaches P14 requirement.
Claims (2)
1. a preparation method for high-performance cement, is characterized in that, comprises the following steps:
A, prepare high-performance cement of the present invention time, rhombspar or magnesite or their mixture (namely containing magnesium carbonate rock) with Portland clinker, gypsum, containing alkali salt levigate granularity to general purpose portland cement together with cement mixture, are prepared into high-performance cement; Or become powder thinner than silicate cement fineness by rhombspar or magnesite or their mixture (namely containing magnesium carbonate rock) and containing alkali salt separate grinding, then be spiked into stir in general purpose portland cement and be prepared into high-performance cement.
B, to mix rhombspar or magnesite or their mixture (namely containing magnesium carbonate rock) in the ratio accounting for silicate cement oeverall quality 2%-11%.
C, foundation cement equivalent sodium oxide quantity, various containing alkali salt by suitably adding, control the equivalent sodium oxide of silicate cement between 0.8-1.8%.
2. a high-performance cement, is characterized in that, prepare that high-performance cement adds containing alkali salt, preferentially select sodium sulfate, potassium sulfate, water glass, potassium silicate, sodium carbonate, salt of wormwood.
This cement comparatively general common silicate cement has better impermeability, frost resistance, anti-carbonation properties, and the feature of good volume stability.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107151983A (en) * | 2017-07-02 | 2017-09-12 | 陈佑生 | A kind of road and bridge use bearing pad stone construction method |
| CN110316986A (en) * | 2019-08-21 | 2019-10-11 | 山东鲁碧建材有限公司 | A kind of magnesium-based cementitious material and preparation method thereof |
| CN112608126A (en) * | 2020-11-27 | 2021-04-06 | 重庆腾治科技有限公司 | Quick-setting early-strength mortar and preparation method thereof |
| CN113800866A (en) * | 2021-09-01 | 2021-12-17 | 嘉华特种水泥股份有限公司 | Multifunctional lightweight concrete and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103396026A (en) * | 2013-07-17 | 2013-11-20 | 吉林建筑大学 | Preparation method and new application of dolomite complex admixture |
| CN104310833A (en) * | 2014-10-07 | 2015-01-28 | 吉林建筑大学 | Functional admixture for improving durability of concrete and cement products and preparation method of functional admixture |
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2015
- 2015-07-04 CN CN201510397943.7A patent/CN104926160A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396026A (en) * | 2013-07-17 | 2013-11-20 | 吉林建筑大学 | Preparation method and new application of dolomite complex admixture |
| WO2015007226A1 (en) * | 2013-07-17 | 2015-01-22 | 吉林建筑大学 | Dolomite composite admixture preparation method and novel application |
| CN104310833A (en) * | 2014-10-07 | 2015-01-28 | 吉林建筑大学 | Functional admixture for improving durability of concrete and cement products and preparation method of functional admixture |
Non-Patent Citations (1)
| Title |
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| 刘家友, 西安交通大学出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107151983A (en) * | 2017-07-02 | 2017-09-12 | 陈佑生 | A kind of road and bridge use bearing pad stone construction method |
| CN107151983B (en) * | 2017-07-02 | 2019-01-22 | 江西省交通工程集团有限公司 | A kind of road and bridge bearing pad stone construction method |
| CN110316986A (en) * | 2019-08-21 | 2019-10-11 | 山东鲁碧建材有限公司 | A kind of magnesium-based cementitious material and preparation method thereof |
| CN112608126A (en) * | 2020-11-27 | 2021-04-06 | 重庆腾治科技有限公司 | Quick-setting early-strength mortar and preparation method thereof |
| CN113800866A (en) * | 2021-09-01 | 2021-12-17 | 嘉华特种水泥股份有限公司 | Multifunctional lightweight concrete and preparation method thereof |
| CN113800866B (en) * | 2021-09-01 | 2022-12-16 | 嘉华特种水泥股份有限公司 | Multifunctional lightweight concrete and preparation method thereof |
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