CN107235701A - 一种耐水型氯氧镁水泥材料 - Google Patents
一种耐水型氯氧镁水泥材料 Download PDFInfo
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000004568 cement Substances 0.000 title claims abstract description 49
- 239000000463 material Substances 0.000 title claims abstract description 43
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 37
- RCJVRSBWZCNNQT-UHFFFAOYSA-N dichloridooxygen Chemical compound ClOCl RCJVRSBWZCNNQT-UHFFFAOYSA-N 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910001868 water Inorganic materials 0.000 title claims abstract description 29
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 39
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- 239000000945 filler Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 16
- 239000003245 coal Substances 0.000 claims description 15
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical class [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 14
- 239000013049 sediment Substances 0.000 claims description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 12
- 239000008236 heating water Substances 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 239000003607 modifier Substances 0.000 claims description 11
- 235000011147 magnesium chloride Nutrition 0.000 claims description 10
- 239000006228 supernatant Substances 0.000 claims description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 4
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000004021 humic acid Substances 0.000 abstract description 3
- 230000007062 hydrolysis Effects 0.000 abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 3
- 239000013522 chelant Substances 0.000 abstract description 2
- 239000004035 construction material Substances 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract description 2
- 239000002657 fibrous material Substances 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 abstract description 2
- 238000011068 loading method Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910021645 metal ion Inorganic materials 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- JWEWPDCILIRASR-UHFFFAOYSA-N [Mg].[O].[Cl] Chemical compound [Mg].[O].[Cl] JWEWPDCILIRASR-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- -1 therefore Chemical compound 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明涉及一种耐水型氯氧镁水泥材料,属于建筑材料制备领域。本发明通过纳米级腐植酸具有较强的极性和金属离子螯合性能,将其负载在纤维材料煅烧形成的孔隙中,均匀释放并分散在水中,与氯氧镁材料中溶出的金属离子发生反应,在水化产物表面形成了致密难溶的络合物保护膜,有效阻止了水泥材料的水解,提高材料耐水性能;本发明通过添加负载有腐殖酸颗粒的玄武岩纤维,通过玄武岩纤维界面粘结横贯裂缝传递应力,使水泥材料能承受更大的荷载,有效改善水泥材料力学性能,减少混凝土中原有微裂纹的产生,同时负载形成的络合物保护膜有效增强强水化产物晶相的结合,填充晶相之间的孔隙,使得水泥材料的强度得到进一步的提升。
Description
技术领域
本发明涉及一种耐水型氯氧镁水泥材料,属于建筑材料制备领域。
背景技术
氯氧镁水泥是瑞典科学家索瑞尔在1867年发明的一种气硬性胶凝材料,由轻烧氧化镁、氯化镁、水按一定的比例调和而成,这种胶凝材料又被称为索瑞尔水泥或菱镁水泥氯氧镁水泥相比于普通的硅酸盐水泥有很多优越性能,如:1.硬化速度快,早期强度高;在室温下成型养护的氯氧镁水泥试块,24h左右即可脱模,抗压强度能达到养护28d强度的20%~30%,7d可达28d强度的80%~90%。2.干空气中的稳定性和气硬性;不同于硅酸盐水泥在水中可以凝结硬化,氯氧镁水泥在终凝后需放在空气中才能继续凝结硬化,若在水中则不能凝结硬化;氯氧镁水泥在干燥的空气中稳定性很好,其抗压和抗折强度随龄期的增加而增加。3.耐磨性较好;氯氧镁水泥是普通硅酸盐水泥耐磨性的3倍。4.弱碱性和低腐蚀性;经测定,氯氧镁水泥浆体的PH值范围为8~9.5,因此,氯氧镁水泥对菱镁混凝土中的有机或无机材料腐蚀比较轻。5.隔热和阻燃性较好;氯氧镁水泥的导热系数较小,只有0.14~0.23w/m·k,因此其隔热性较好;因为氯氧镁水泥由不可燃的氧化镁和氯化镁制成,因此,氯氧镁水泥阻燃性能较好。6.粘结性能好;氯氧镁水泥只对金属材料的粘结性差,对各种无机、有机集料和纤维有很好的粘结性。
氯氧镁水泥固然有很多的优越性能,但它的缺点也较为明显:当氯氧镁水泥受
时,其中的5相晶体和3相晶体就会水解转变成Mg(OH)2,因为Mg(OH)2是层状松散堆积结构,所以氯氧镁水泥制品的强度就会降低且更易吸潮返卤,影响制品外观。氯氧镁水泥制品浸水28d后,强度只有浸水前的20%~30%,若继续浸水,强度会继续降低,所以制备一种耐水性较好,不易发生水解反应的氯氧镁水泥材料很有必要。
发明内容
本发明所要解决的技术问题:针对现有氯氧镁水泥材料耐水性较差,易发生水解降低材料强度的问题,提供了一种耐水型氯氧镁水泥材料。
为解决上述技术问题,本发明采用如下所述的技术方案是:
一种耐水型氯氧镁水泥材料,由以下重量份物质组成:
45~50份轻烧菱镁粉、25~30份氯化镁和10~15份混合改性粉末,所述的混合改性粉末具体制备步骤为:
(1)按质量比1:10,将风化煤粉末与盐酸混合,水浴加热后静置冷却至室温,得混合液,按质量比1:10,将乙二醇添加至混合液中,离心分离收集下层沉淀,按质量比1:10,将下层沉淀与氨水溶液搅拌混合,静置陈化,抽滤并收集上层清液,调节上清液pH至3.0,离心分离并收集下层沉淀,洗涤、干燥、碾磨并过150目筛得改性粉末;
(2)按质量比1:10,将氢氧化铝与磷酸溶液混合,水浴加热并搅拌混合,得粘结改性剂,按质量比1:8,将粘结改性剂与玄武岩纤维混合,压制成型得压制坯体,将压制坯体下预烧后升温,保温煅烧并静置冷却至室温,破碎球磨得改性填料;
(3)按质量比1:5,将改性填料与改性填料混合并球磨过200目筛,制备得混合改性粉末;
所述的轻烧菱镁粉和氯化镁粒径均为250目
步骤(1)所述的调节上清液pH采用的是质量分数20%硫酸。
步骤(2)所述的磷酸溶液为质量分数5%的磷酸溶液。
步骤(2)所述的压制成型压强为10~15MPa。
步骤(2)所述的预烧温度为120~130℃。
步骤(2)所述的保温煅烧温度为1250~1300℃。
本发明与其他方法相比,有益技术效果是:
(1)本发明通过对风化煤进行提取,制备纳米级腐植酸,由于纳米腐植酸具有较强的极性和金属离子螯合性能,将其负载在纤维材料煅烧形成的孔隙中,由于水泥制备浆料中添加大量的水,使其均匀释放并分散在水中,与氯氧镁材料中溶出的金属离子发生反应,在水化产物表面形成了致密难溶的络合物保护膜,有效阻止了水泥材料的水解,提高材料耐水性能。
(2)本发明通过添加负载有腐殖酸颗粒的玄武岩纤维,通过玄武岩纤维界面粘结横贯裂缝传递应力,使水泥材料能承受更大的荷载,有效改善水泥材料力学性能,减少混凝土中原有微裂纹的产生,同时负载形成的络合物保护膜有效增强强水化产物晶相的结合,填充晶相之间的孔隙,使得水泥材料的强度得到进一步的提升,使其水化后的耐水性能具有优异的提升。
具体实施方式
选取风化煤并置于粉碎机中,粉碎并过100目筛,得过筛风化煤粉末,按质量比1:10,将风化煤粉末与质量分数10%盐酸混合,在55~60℃下水浴加热25~30min,随后静置冷却至室温,得混合液,按质量比1:10,将乙二醇添加至混合液中,在3500~4000r/min下离心分离10~15min,收集下层沉淀并按质量比1:10,将下层沉淀与质量分数8%氨水溶液混合,在2500~3000r/min下搅拌混合25~30min,随后静置陈化,抽滤并收集上层清液,用质量分数20%硫酸调节pH至3.0,离心分离并收集下层沉淀,用去离子水洗涤至洗涤液呈中性后,再在75~80℃下干燥3~5h,碾磨并过150目筛,制备得改性粉末;按质量比1:10,将氢氧化铝与质量分数5%磷酸溶液混合,在45~50℃下水浴加热并搅拌混合25~30min,得粘结改性剂,按质量比1:8,将粘结改性剂与玄武岩纤维混合,在室温下以10~15MPa压制成型,得压制坯体,将压制坯体置于120~130℃下预烧10~12h,随后按5℃/min升温至1250~1300℃,保温煅烧并静置冷却至室温,破碎研磨并置于球磨罐中,在200~300r/min下球磨3~5h,过150目筛得改性填料,按质量比1:5,将改性填料与改性填料混合并球磨过200目筛,制备得混合改性粉末;按重量份数计,分别称量45~50份轻烧菱镁粉、25~30份氯化镁和10~15份混合改性粉末置于高速搅拌机中,搅拌混合10~15min,即可制备得一种耐水型氯氧镁水泥材料。
实例1
选取风化煤并置于粉碎机中,粉碎并过100目筛,得过筛风化煤粉末,按质量比1:10,将风化煤粉末与质量分数10%盐酸混合,在55℃下水浴加热25min,随后静置冷却至室温,得混合液,按质量比1:10,将乙二醇添加至混合液中,在3500r/min下离心分离10min,收集下层沉淀并按质量比1:10,将下层沉淀与质量分数8%氨水溶液混合,在2500r/min下搅拌混合25min,随后静置陈化,抽滤并收集上层清液,用质量分数20%硫酸调节pH至3.0,离心分离并收集下层沉淀,用去离子水洗涤至洗涤液呈中性后,再在75℃下干燥3h,碾磨并过150目筛,制备得改性粉末;按质量比1:10,将氢氧化铝与质量分数5%磷酸溶液混合,在45℃下水浴加热并搅拌混合25min,得粘结改性剂,按质量比1:8,将粘结改性剂与玄武岩纤维混合,在室温下以10MPa压制成型,得压制坯体,将压制坯体置于120℃下预烧10h,随后按5℃/min升温至1250℃,保温煅烧并静置冷却至室温,破碎研磨并置于球磨罐中,在200r/min下球磨3h,过150目筛得改性填料,按质量比1:5,将改性填料与改性填料混合并球磨过200目筛,制备得混合改性粉末;按重量份数计,分别称量45份轻烧菱镁粉、25份氯化镁和10份混合改性粉末置于高速搅拌机中,搅拌混合10min,即可制备得一种耐水型氯氧镁水泥材料。
实例2
选取风化煤并置于粉碎机中,粉碎并过100目筛,得过筛风化煤粉末,按质量比1:10,将风化煤粉末与质量分数10%盐酸混合,在57℃下水浴加热27min,随后静置冷却至室温,得混合液,按质量比1:10,将乙二醇添加至混合液中,在3750r/min下离心分离12min,收集下层沉淀并按质量比1:10,将下层沉淀与质量分数8%氨水溶液混合,在2750r/min下搅拌混合27min,随后静置陈化,抽滤并收集上层清液,用质量分数20%硫酸调节pH至3.0,离心分离并收集下层沉淀,用去离子水洗涤至洗涤液呈中性后,再在77℃下干燥4h,碾磨并过150目筛,制备得改性粉末;按质量比1:10,将氢氧化铝与质量分数5%磷酸溶液混合,在47℃下水浴加热并搅拌混合27min,得粘结改性剂,按质量比1:8,将粘结改性剂与玄武岩纤维混合,在室温下以12MPa压制成型,得压制坯体,将压制坯体置于125℃下预烧11h,随后按5℃/min升温至1275℃,保温煅烧并静置冷却至室温,破碎研磨并置于球磨罐中,在250r/min下球磨4h,过150目筛得改性填料,按质量比1:5,将改性填料与改性填料混合并球磨过200目筛,制备得混合改性粉末;按重量份数计,分别称量47份轻烧菱镁粉、27份氯化镁和12份混合改性粉末置于高速搅拌机中,搅拌混合12min,即可制备得一种耐水型氯氧镁水泥材料。
实例3
选取风化煤并置于粉碎机中,粉碎并过100目筛,得过筛风化煤粉末,按质量比1:10,将风化煤粉末与质量分数10%盐酸混合,在60℃下水浴加热30min,随后静置冷却至室温,得混合液,按质量比1:10,将乙二醇添加至混合液中,在4000r/min下离心分离15min,收集下层沉淀并按质量比1:10,将下层沉淀与质量分数8%氨水溶液混合,在3000r/min下搅拌混合30min,随后静置陈化,抽滤并收集上层清液,用质量分数20%硫酸调节pH至3.0,离心分离并收集下层沉淀,用去离子水洗涤至洗涤液呈中性后,再在80℃下干燥5h,碾磨并过150目筛,制备得改性粉末;按质量比1:10,将氢氧化铝与质量分数5%磷酸溶液混合,在50℃下水浴加热并搅拌混合30min,得粘结改性剂,按质量比1:8,将粘结改性剂与玄武岩纤维混合,在室温下以15MPa压制成型,得压制坯体,将压制坯体置于130℃下预烧12h,随后按5℃/min升温至1300℃,保温煅烧并静置冷却至室温,破碎研磨并置于球磨罐中,在300r/min下球磨5h,过150目筛得改性填料,按质量比1:5,将改性填料与改性填料混合并球磨过200目筛,制备得混合改性粉末;按重量份数计,分别称量50份轻烧菱镁粉、30份氯化镁和15份混合改性粉末置于高速搅拌机中,搅拌混合15min,即可制备得一种耐水型氯氧镁水泥材料。
将不添加混合改性粉末的氯氧镁水泥材料作为空白对照组,同时将空白对照组和实例1,2,3中材料与水混合并浇注至长宽高4cm×4cm×16cm的模具中,振实后在(25±2)℃的温度和﹙65±5﹚%的湿度条件下封闭养护1天脱模,脱模后在(25±2)℃下于空气中养护28天后进行对照试验,表1为对照组实验表。
表1氯氧镁水泥材料对照表
由上表可知,本发明制备的氯氧镁水泥材料耐水性能优异,且浸水后材料力学性能优异。
Claims (7)
1.一种耐水型氯氧镁水泥材料,其特征在于,由以下重量份物质组成:
45~50份轻烧菱镁粉、25~30份氯化镁和10~15份混合改性粉末,所述的混合改性粉末具体制备步骤为:
(1)按质量比1:10,将风化煤粉末与盐酸混合,水浴加热后静置冷却至室温,得混合液,按质量比1:10,将乙二醇添加至混合液中,离心分离收集下层沉淀,按质量比1:10,将下层沉淀与氨水溶液搅拌混合,静置陈化,抽滤并收集上层清液,调节上清液pH至3.0,离心分离并收集下层沉淀,洗涤、干燥、碾磨并过150目筛得改性粉末;
(2)按质量比1:10,将氢氧化铝与磷酸溶液混合,水浴加热并搅拌混合,得粘结改性剂,按质量比1:8,将粘结改性剂与玄武岩纤维混合,压制成型得压制坯体,将压制坯体下预烧后升温,保温煅烧并静置冷却至室温,破碎球磨得改性填料;
(3)按质量比1:5,将改性填料与改性填料混合并球磨过200目筛,制备得混合改性粉末。
2.根据权利要求1所述的一种耐水型氯氧镁水泥材料,其特征在于:所述的轻烧菱镁粉和氯化镁粒径均为250目。
3.根据权利要求1所述的一种耐水型氯氧镁水泥材料,其特征在于:步骤(1)所述的调节上清液pH采用的是质量分数20%硫酸。
4.根据权利要求1所述的一种耐水型氯氧镁水泥材料,其特征在于:步骤(2)所述的磷酸溶液为质量分数5%的磷酸溶液。
5.根据权利要求1所述的一种耐水型氯氧镁水泥材料,其特征在于:步骤(2)所述的压制成型压强为10~15MPa。
6.根据权利要求1所述的一种耐水型氯氧镁水泥材料,其特征在于:步骤(2)所述的预烧温度为120~130℃。
7.根据权利要求1所述的一种耐水型氯氧镁水泥材料,其特征在于:步骤(2)所述的保温煅烧温度为1250~1300℃。
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