CN1194951A - 提高粉煤灰活性的处理方法 - Google Patents

提高粉煤灰活性的处理方法 Download PDF

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CN1194951A
CN1194951A CN98101418A CN98101418A CN1194951A CN 1194951 A CN1194951 A CN 1194951A CN 98101418 A CN98101418 A CN 98101418A CN 98101418 A CN98101418 A CN 98101418A CN 1194951 A CN1194951 A CN 1194951A
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flyash
acid
activity
cement
enhancing
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CN1069884C (zh
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肖忠明
张大同
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China Building Materials Academy CBMA
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China Building Materials Academy CBMA
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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
    • 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
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

本发明涉及一种提高粉煤灰活性的处理方法,利用酸与粉煤灰进行搅拌并陈放一定时间制得高活性粉煤灰,其中粉煤灰用量为80—96%,酸用量< 20%。本发明利用酸对粉煤灰进行活化处理,避免了大量的碱性物质的引入对砼耐久性的危害。粉煤灰经酸处理后,其活性经酸及水泥中的碱的两次激发,较单纯碱激发的效果更佳。

Description

提高粉煤灰活性的处理方法
本发明涉及一种利用酸来提高粉煤灰活性的处理方法。
粉煤灰由于其具有火山灰活性而用于水泥砼等建筑材料，但由于其活性主要来源的酸性玻璃微珠的致密结构使粉煤灰的活性不如碱性矿渣那样被容易地激发，在水泥中其活性大多要在28天后才能表现出来。
目前，活化粉煤灰的传统方法为碱性物质活化及机械活化。碱性物质活化的机理为通过碱性物质腐蚀破坏掉粉煤灰微珠的致密结构，提高其活性；而机械活化则是通过增大其反应总表面积来提高其活性。上述两点的不足之处为：机械活化效果不佳，电耗大，产量低；而碱性物质活化又将大量的碱带入水泥砼中，对砼的耐久性不利。
本发明的目的在于发明一种提高粉煤灰活性的处理方法，以提高粉煤灰的活性，并减少碱性物质的引入对砼耐久性的影响。
本发明利用酸对粉煤灰进行处理。通过在粉煤灰中加入酸搅拌均匀，陈放一段时间后再烘干，用酸破坏掉粉煤灰的致密结构，增大其表面活化能，从而制成高活性粉煤灰。加入的酸同粉煤灰中氧化物的反应物如CaSO、CaCl等引入水泥中作为水泥的活性组份，提高了水泥的强度性能。
本发明所述的酸可为工业用酸，也可为废酸。前述陈放的时间应大于2小时。本发明所述的高活性粉煤灰的配比为：未处理的粉煤灰80-96％，酸(纯酸)＜20％。
利用本发明制备的高活性粉煤灰制成的含30％该灰的水泥同纯硅酸盐水泥的抗压强度比，较掺30％未处理的粉煤灰水泥的抗压强度比提高15-30％。
例1：
将88％的一级粉煤灰用12％的硫酸搅拌处理，放置三小时后，结果如下：
                                         抗压强度 MPa
试样              粉煤灰样及量          3天        28天
纯硅酸盐水泥          /              25.76/100   52.53/100
粉煤灰水泥        30％未处理灰       15.48/60.1  38.81/73.9
粉煤灰水泥         30％处理灰        23.21/90.1  50.97/97.0
例2：
将90％的三级粉煤灰用10％的硫酸搅拌处理，放置三小时后，结果如下：
                                  抗压强度   MPa
  试样        粉煤灰样及量      3天          28天
纯硅酸盐水泥       /         26.09/100    56.31/100
粉煤灰水泥    30％未处理灰   10.33/39.6   32.88/58.36
粉煤灰水泥     30％处理灰    22.29/85.4   48.68/86.45
本发明利用酸对粉煤灰进行活化处理，进免了大量碱性物质的引入对砼耐久性的危害。粉煤灰经酸处理后，其活性经酸及水泥中的碱的两次激发，较单纯碱激发的效果更佳。

Claims (2)

1.一种提高粉煤灰活性的处理方法，其特征在于：利用酸与粉煤灰进行搅拌并陈放两小时以上再烘干制得高活性粉煤灰，其中粉煤灰用量为80-96％，酸用量＜20％。
2.根据权利要求1所述的处理方法，其特征在于：所述的酸为工业用酸或废酸。
CN98101418A 1998-04-20 1998-04-20 提高粉煤灰活性的处理方法 Expired - Fee Related CN1069884C (zh)

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CN98101418A CN1069884C (zh) 1998-04-20 1998-04-20 提高粉煤灰活性的处理方法

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Application Number Priority Date Filing Date Title
CN98101418A CN1069884C (zh) 1998-04-20 1998-04-20 提高粉煤灰活性的处理方法

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CN1194951A true CN1194951A (zh) 1998-10-07
CN1069884C CN1069884C (zh) 2001-08-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003078348A3 (en) * 2002-03-19 2004-02-12 Cdem Holland Bv Method of improving material comprising a pozzolanic component

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1029116C (zh) * 1988-01-21 1995-06-28 国家建材局苏州混凝土水泥制品研究院 粉煤灰活性激发方法
CN1136544A (zh) * 1995-05-19 1996-11-27 路西泉 活性粉煤灰肥料

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003078348A3 (en) * 2002-03-19 2004-02-12 Cdem Holland Bv Method of improving material comprising a pozzolanic component

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