CN114988738B - 一种改性白云石粉及其制备方法和混凝土 - Google Patents
一种改性白云石粉及其制备方法和混凝土 Download PDFInfo
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- 239000010459 dolomite Substances 0.000 title claims abstract description 102
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 102
- 239000000843 powder Substances 0.000 title claims abstract description 100
- 239000004567 concrete Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000004090 dissolution Methods 0.000 claims abstract description 21
- 239000000945 filler Substances 0.000 claims abstract description 19
- 239000011148 porous material Substances 0.000 claims abstract description 19
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 18
- 239000010452 phosphate Substances 0.000 claims abstract description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 18
- 239000006184 cosolvent Substances 0.000 claims abstract description 7
- 230000001737 promoting effect Effects 0.000 claims abstract description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 4
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 4
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 4
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910052939 potassium sulfate Inorganic materials 0.000 claims abstract description 4
- 235000011151 potassium sulphates Nutrition 0.000 claims abstract description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000003085 diluting agent Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 2
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 2
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 2
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 2
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 206010016807 Fluid retention Diseases 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
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- 239000000440 bentonite Substances 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
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- 238000000227 grinding Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-M dihydrogenphosphate Chemical compound OP(O)([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-M 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 238000005204 segregation Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
Classifications
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- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
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- C04B28/105—Magnesium oxide or magnesium carbonate cements
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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- 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
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
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- C04B22/142—Sulfates
- C04B22/147—Alkali-metal sulfates; Ammonium sulfate
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- 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
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
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- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
本发明公开了一种改性白云石粉及其制备方法和混凝土，其由白云石粉98～99％，白云石粉专用促溶剂0.2～0.5％、磷酸二氢盐0.6～1.0％和毛细孔填充剂0.2～0.5％按照质量百分比制成；所述促溶剂为硫酸钠、硫酸钾、硫酸铵中的一种或多种。通过促进白云石粉表面的溶解、参与水化反应和毛细孔填充三重改性，解决了现有技术中白云石粉混凝土的泌水、强度和耐久性问题，得到的改性白云石粉溶解度好、化学活性高，制备的混凝土强度和密实度高，孔隙率低，且具有优异的耐久性。
Description
技术领域
本发明属于建筑材料领域，具体涉及一种改性白云石粉及其制备方法，还涉及一种含有上述改性白云石粉的混凝土。
背景技术
近年来随着水利、交通及各类民用设施建设的迅速发展，混凝土的用量日益增大。目前在混凝土中大量使用且最普及的矿物掺合料为粉煤灰和矿粉。但当前我国的粉煤灰市场逐渐面临资源紧缺和运输距离远的问题，这大大提高了混凝土的制造成本，增加了工程造价。另一方面，当前粉煤灰市场混乱、质量不稳定、以次充好、供应紧缺等问题突出，使混凝土的供应和质量均受到很大的影响。如果大量采用矿粉代替粉煤灰，则会造成混凝土生产企业的成本大幅度增加，且配制的高标号混凝土粘度大、施工效率低等问题。因此，急需寻求一种资源分布广、性能稳定的矿物掺合料替代粉煤灰。
白云石是我国储量丰富的矿产资源之一，每年白云石开采量超过千万吨。但由于白云石在破碎过程中会产生大量的固体废渣废粉，因此如将白云石的废渣废粉进行改性处理，作为一种混凝土用矿物掺合料使用，则具有资源丰富、成本低廉、能耗低且经济实用等优点，其市场前景广阔。
有研究指出，白云石粉在水泥胶凝材料体系中主要起到微集料填充作用，对微观结构有一定优化作用。但是，白云石粉应用于混凝土存在以下几个问题：1)白云石粉在水泥基材料中的溶解度极低，很难与水泥发生化学反应，化学活性明显偏低，对水泥混凝土的强度不利，且其掺量越高，混凝土强度下降越显著；2)白云石粉表面光滑，附着的水膜薄，保水性差，配制的混凝土易离析泌水；3)考虑到技术的经济性，白云石粉的改性成本不能使其价格高于粉煤灰等传统矿物掺合料。
公开号为CN103396026A的中国专利公开了一种用于制备微膨胀或补偿收缩混凝土的白云石复合掺合料的制备方法。该掺合料是将白云石磨细至与硅酸盐水泥基本相同的粒度，再掺入一定当量氧化钠的含碱物质均匀混合而成，提高了掺石粉混凝土抗渗性和抗折强度，但没有提高掺石粉混凝土的抗压强度，且较高掺量的含碱物质可能使混凝土返碱。
公开号为CN106747090A的中国专利公开了一种改性白云石粉基矿物掺合料，由白云石粉、矿粉、粉煤灰和膨润土混合均匀制成，但吸水膨胀的膨润土在混凝土硬化过程中会逐步失水收缩，将会增加混凝土的收缩；另一方面，矿粉和膨润土的价格远高于白云石粉，且掺量高，因此该改性白云石粉基矿物掺合料的性价比低，限制其推广使用。
公开号为CN108046621A的中国专利公开了一种煅烧白云石粉的制备方法，使煅烧白云石粉具有较强的化学活性，可作为制备磷酸镁水泥和氯氧镁水泥的主要原材料。但该制备方法能耗高，成本显著高于粉煤灰和粒化高炉矿渣粉的价格。如作为混凝土用矿物掺合料，不具有经济性和实用性。
因此，针对改性白云石粉的性价比以及白云石粉混凝土易离析泌水和抗压强度不高的问题，有必要开发出一种高保水性的改性白云石粉，其制备工艺简单、成本低，原材料无毒无害、绿色环保。
发明内容
本发明提供了一种改性白云石粉，通过对白云石粉进行物理和化学双重改性，改善白云石粉表面的粗糙程度和亲水性，且使白云石粉具有一定的水化活性。
为了实现上述目的，本发明采用以下技术方案：
一种改性白云石粉，其由白云石粉98～99％，促溶剂0.2～0.5％、磷酸二氢盐0.6～1.0％和毛细孔填充剂0.2～0.5％按照质量百分比制备而成；
所述促溶剂为硫酸钠、硫酸钾、硫酸铵中的一种或多种。
进一步方案，所述白云石粉的粒径为300～600目。
本发明优选了300～600目的白云石粉，其粒径比水泥小，一方面能增加混凝土的密实程度；另一方面，300～600目的粉磨成本较低，配制的混凝土强度高，相比更细或更粗的白云石粉，300～600目白云石粉的性价比更高。
更优选的，白云石粉的粒径为600目，使得改性白云石粉的性能最佳。
进一步方案，所述磷酸二氢盐为磷酸二氢铵、磷酸二氢钾、磷酸二氢钠中的一种或多种。
进一步方案，所述毛细孔填充剂为聚合硫酸铝、聚合硫酸铁、聚合硫酸铝铁中的一种或多种。
进一步方案，所述促溶剂、磷酸二氢盐和毛细孔填充剂的质量比为2：6：2。
本发明中使用的促溶剂为硫酸钠、硫酸钾、硫酸铵，是白云石粉专用促溶剂，其可在水中电离出高浓度的SO4 2-，而SO4 2-可降低白云石中Ca2+、Mg2+和CO3 2-的离子活度，促使Ca2 +、Mg2+和CO3 2-在水中的离子浓度增加，进而提高了白云石在水中的溶解度。而白云石粉末的部分溶解将使其非常致密的表面逐渐溶蚀，形成凹凸不平的粗糙表面，进而促进了石粉表面水膜的附着，即白云石粉的保水性得到增加。
而且Ca2+、CO3 2-可与水泥中的铝酸三钙C3A(3CaO·Al2O3)发生化学反应，Mg2+可与磷酸二氢盐(BH2PO4)发生化学反应，如下：
C3A+CaCO3→3CaO·Al2O3·CaCO3·11H2O
B++H++PO4 3-+Mg2+→MgBPO4·6H2O
生成的3CaO·Al2O3·CaCO3·11H2O和MgBPO4·6H2O在混凝土中有以下作用：一是起到一定的胶凝作用，提高白云石粉混凝土的强度；二是能填充混凝土中的孔隙，阻碍外界侵蚀介质进入混凝土内部，进而提高白云石粉混凝土的耐久性；三是3CaO·Al2O3·CaCO3·11H2O和MgBPO4·6H2O是沉淀物，因而上述化学反应式能不断进行，白云石粉的表面也能不断被溶蚀。
毛细孔填充剂聚合硫酸铝、聚合硫酸铁、聚合硫酸铝铁能与水泥的水化产物Ca(OH)2反应生成不溶于水的Al(OH)3或Fe(OH)3胶体，同时还能与水泥中的水化铝酸钙作用，生成具有一定膨胀性的钙矾石晶体。这些胶体和晶体填充了混凝土的毛细通道，从而提高阻碍了外界侵蚀介质进入混凝土内部，进而提高白云石粉混凝土的耐久性。毛细孔填充剂是无机盐，且能参与水泥水化，因而不会降低混凝土的强度。
优选的，所述白云石粉专用促溶剂、磷酸二氢盐和毛细孔填充剂的质量比为2:6:2，从而使得改性白云石粉的性能达到最优。
本发明的第二个发明目的是提供一种改性白云石粉的制备方法，其包括以下步骤：
(1)按照配比称取白云石粉、促溶剂、磷酸二氢盐和毛细孔填充剂；
(2)用水将促溶剂溶解成稀释液；
(3)在白云石粉搅拌的同时喷洒促溶剂稀释液，使促溶剂均匀分散于石粉之间；
(4)再加入磷酸二氢盐和毛细孔填充剂，充分混合均匀制得改性白云石粉。
进一步方案，所述促溶剂稀释液的质量浓度为5～10％。
可以理解的是，这里的混合为本领域常规的机械混合，其混合时间这里不再做具体的限定，只要能使其混合均匀即可，在本发明的一些实施例中，优选的混合时间为10min。
本发明的第三个发明目的是提供一种混凝土，其含有上述改性白云石粉，所述改性白云石粉的加入量为胶凝材料的15～30％。
与现有技术相比，本发明具有以下有益效果：
本发明中使用白云石粉专用促溶剂、磷酸二氢盐和毛细孔填充剂混合的化学改性剂，促进了白云石粉的溶解，并与磷酸二氢盐和水泥熟料C3A发生化学反应，提高了常温下白云石粉的化学活性和保水性，降低了混凝土的孔隙率，进而提高了混凝土的强度和密实度，使得白云石粉混凝土的强度和耐久性也能跟常规的粉煤灰混凝土相当，极大的促进了白云石粉在混凝土中的应用，为解决优质粉煤灰短缺的市场问题提供了一种新的替代方案。
具体实施方式
为了便于理解本发明，下面将结合具体的实施例对本发明进行更全面的描述。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施方式。相反地，提供这些实施方式的目的是使对本发明的公开内容理解的更加透彻全面。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本发明。
以下实施例和对比例中改性白云石粉的制备方法均为：
(1)按照下表1中配比称取白云石粉、促溶剂、磷酸二氢盐和毛细孔填充剂；
(2)用水将促溶剂溶解成质量浓度为5～10％的促溶剂稀释液；
(3)在白云石粉搅拌的同时喷洒促溶剂稀释液，使促溶剂均匀分散于石粉之间；
(4)再加入磷酸二氢盐和毛细孔填充剂，充分混合均匀制得改性白云石粉。
同时用Ⅱ级粉煤灰作为对比例1。
表1实施例1～6和对比例1～5中改性白云石粉的各原料组分和配比
混凝土的组分和配比如表2：
表2混凝土组分配合比(单位为kg)
将上述制得的混凝土按照GB/T 50082-2009《普通混凝土长期性能和耐久性能试验方法标准》进行的各组混凝土试件的工作性能、力学性能和耐久性能测试。
其中配合比1中Ⅱ级粉煤灰组成为表1中的对比例1；配合比3中的改性白云石粉的组成为表1中的实施例1～6和对比例2～5，性能检测结果见表3；
表3混凝土性能测试结果
实施例3制备的改性白云石粉分别按表2中配合比2～5配比制得的混凝土，其性能测试结果见表4。
表4实施例3改性白云石粉制得的混凝土性能测试结果
| 编号 | 配方 | 常压泌水率(％) | 28d抗压强度(MPa) | 电通量(C) |
| 混凝土12 | 配合比2 | 0 | 47.2 | 1433 |
| 混凝土13 | 配合比3 | 0 | 45.6 | 1458 |
| 混凝土14 | 配合比4 | 0 | 42.0 | 1367 |
| 混凝土15 | 配合比5 | 0 | 40.9 | 1312 |
根据表3和表4中的测试结果可以看出，单掺白云石粉制得的混凝土2，其常压泌水率为32％，高于规范要求；28d抗压强度和电通量也明显偏低。加入改性白云石粉，混凝土的各性能指标均得到明显优化，其中加入由600目白云石粉制成的改性白云石粉，制成的混凝土6～8和单掺Ⅱ级粉煤灰的混凝土1的各性能指标基本相当，其工作性能、力学性能和耐久性能良好。所以本发明中的改性白云石粉可替代Ⅱ级粉煤灰用作在混凝土的原料，由于促溶剂、磷酸二氢盐和毛细孔填充剂的成本较低，生产工艺简单，故改性白云石粉的总成本低于Ⅱ级粉煤灰的价格，从而可大量降低混凝土的生产成本，且性能相当。
而加入对比例3～5中单一改性剂对白云石粉进行改性，其制备的混凝土3～5的性能明显比混凝土6～8差，因此，采用促溶剂、磷酸二氢盐和毛细孔填充剂共同对白云石粉进行改性可明显提高混凝土的工作性能、力学性能和耐久性。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。
Claims (8)
1.一种改性白云石粉，其特征在于：其由白云石粉98～99％、促溶剂0.2～0.5％、磷酸二氢盐0.6～1.0％和毛细孔填充剂0.2～0.5％按照质量百分比制备而成；
所述促溶剂为硫酸钠、硫酸钾、硫酸铵中的一种或多种；
所述毛细孔填充剂为聚合硫酸铝、聚合硫酸铁、聚合硫酸铝铁中的一种或多种。
2.根据权利要求1所述的改性白云石粉，其特征在于：所述白云石粉的粒径为300～600目。
3.根据权利要求2所述的改性白云石粉，其特征在于：所述白云石粉的粒径为600目。
4.根据权利要求1所述的改性白云石粉，其特征在于：所述磷酸二氢盐为磷酸二氢铵、磷酸二氢钾、磷酸二氢钠中的一种或多种。
5.根据权利要求1所述的改性白云石粉，其特征在于：所述促溶剂、磷酸二氢盐和毛细孔填充剂的质量比为2：6：2。
6.如权利要求1-5任一项所述的改性白云石粉的制备方法，其特征在于：包括以下步骤：
(1)按照配比称取白云石粉、促溶剂、磷酸二氢盐和毛细孔填充剂；
(2)用水将促溶剂溶解成稀释液；
(3)在白云石粉搅拌的同时喷洒促溶剂稀释液，使促溶剂均匀分散于石粉之间；
(4)再加入磷酸二氢盐和毛细孔填充剂，充分混合均匀制得改性白云石粉。
7.根据权利要求6所述的制备方法，其特征在于：所述促溶剂稀释液的质量浓度为5～10％。
8.一种混凝土，其特征在于：含有如权利要求1～5任一项所述的改性白云石粉，所述改性白云石粉的加入量为胶凝材料质量的15～30％。
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