CN1069884C - Treating method for enhancing flyash activity - Google Patents

Treating method for enhancing flyash activity Download PDF

Info

Publication number
CN1069884C
CN1069884C CN98101418A CN98101418A CN1069884C CN 1069884 C CN1069884 C CN 1069884C CN 98101418 A CN98101418 A CN 98101418A CN 98101418 A CN98101418 A CN 98101418A CN 1069884 C CN1069884 C CN 1069884C
Authority
CN
China
Prior art keywords
acid
coal ash
flyash
activity
cement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN98101418A
Other languages
Chinese (zh)
Other versions
CN1194951A (en
Inventor
肖忠明
张大同
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Building Materials Academy CBMA
Original Assignee
China Building Materials Academy CBMA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Building Materials Academy CBMA filed Critical China Building Materials Academy CBMA
Priority to CN98101418A priority Critical patent/CN1069884C/en
Publication of CN1194951A publication Critical patent/CN1194951A/en
Application granted granted Critical
Publication of CN1069884C publication Critical patent/CN1069884C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • 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

The present invention relates to a treating method for enhancing the activity of coal ash. Acid is stirred with coal ash and placed for a certain time to manufacture coal ash having high activity, wherein the coal ash has the using quantity of 80 to 96% and the acid using quantity which is less than 20 %. The present invention uses the acid to actively treat the coal ash and avoids harm to the durability of concrete due to the introduction of a large amount of alkaline substances. After the coal ash is treated by the acid, the activation effect of the activity of the coal ash via twice excitation of alkali in the acid and cement is better than that of single alkali activation.

Description

Improve the treatment process of flyash activity
The present invention relates to a kind of treatment process of utilizing acid to improve flyash activity.
Flyash is used for material of construction such as Cement Concrete owing to it has pozzolanic activity, but because the dense structure of the acid glass microballon of its active main source makes the activity of flyash easily be excited like that not as alkaline slag, its activity will just can show after 28 days mostly in cement.
At present, the traditional method of activating fly ash is alkaline matter activation and mechanical activation.Alkaline matter activatory mechanism improves its activity for the dense structure by alkaline matter corrosion failure dry linting fly ash micro-bead; Mechanical activation then is to improve its activity by increasing its reaction total surface area.Above-mentioned 2 weak point is: the mechanical activation poor effect, and power consumption is big, yields poorly; And the alkaline matter activation is brought a large amount of alkali in the Cement Concrete into, and is unfavorable to the weather resistance of concrete.
The objective of the invention is to invent a kind of treatment process that improves flyash activity,, and reduce the influence of the introducing of alkaline matter the concrete weather resistance with the activity of raising flyash.
The present invention utilizes acid that flyash is handled.Stir by in flyash, adding acid, display oven dry again after for some time,, increase its surface active energy, thereby make high-active flyash with the sour dense structure that destroys flyash.The acid that adds is with the reactant such as the CaSO of oxide compound in the flyash 4, CaCl 2Deng introducing in the cement, improved the cement intensity performance as the active constituent of cement.
Acid of the present invention is sulfuric acid.The aforementioned time of displaying should be greater than 2 hours.The proportioning of high-active flyash of the present invention is: untreated flyash weight percent is 88-96%, and acid (pure acid) usage percentage is 4-12%.
The high-active flyash that utilizes the present invention to prepare is made contain 30% should ash cement with the compressive strength rate of neat portland cement, the compressive strength rate of mixing 30% untreated pulverized fuel ash cement improves 15-30%.
Example 1:
First level flour coal ash with 88% is placed after three hours with 12% sulfuric acid stir process, and the result is as follows:
Ultimate compression strength MPa
Sample fine coal ash sample and measuring 3 days 28 days
Neat portland cement/25.76/100 52.53/100
The pulverized fuel ash cement 30% grey 15.48/60.1 38.81/73.9 that is untreated
Pulverized fuel ash cement 30% is handled grey 23.21/90.1 50.97/97.0
Example 2:
Three grades of flyash with 90% are placed after three hours with 10% sulfuric acid stir process, and the result is as follows:
Ultimate compression strength MPa
Sample fine coal ash sample and measuring 3 days 28 days
Neat portland cement/26.09/100 56.31/100
The pulverized fuel ash cement 30% grey 10.33/39.6 32.88/58.36 that is untreated
Pulverized fuel ash cement 30% is handled grey 22.29/85.4 48.68/86.45
The present invention utilizes acid that flyash is carried out activation treatment, has avoided the harm of the introducing of a large amount of alkaline matters to the concrete weather resistance.Flyash excites for twice of the alkali of its activity in acid and cement after acid treatment, and the effect that simple alkali excites is better.

Claims (2)

1. treatment process that improves flyash activity is characterized in that: oven dry makes high-active flyash to utilize acid and flyash to stir and display more than two hours again, and wherein the flyash weight percent is 88-96%, and sour weight percent is 4-12%.
2. treatment process according to claim 1 is characterized in that: described acid is sulfuric acid.
CN98101418A 1998-04-20 1998-04-20 Treating method for enhancing flyash activity Expired - Fee Related CN1069884C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN98101418A CN1069884C (en) 1998-04-20 1998-04-20 Treating method for enhancing flyash activity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN98101418A CN1069884C (en) 1998-04-20 1998-04-20 Treating method for enhancing flyash activity

Publications (2)

Publication Number Publication Date
CN1194951A CN1194951A (en) 1998-10-07
CN1069884C true CN1069884C (en) 2001-08-22

Family

ID=5216681

Family Applications (1)

Application Number Title Priority Date Filing Date
CN98101418A Expired - Fee Related CN1069884C (en) 1998-04-20 1998-04-20 Treating method for enhancing flyash activity

Country Status (1)

Country Link
CN (1) CN1069884C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1020205C2 (en) * 2002-03-19 2003-09-23 Cdem Holland Bv Method for working up material containing a pozzolane component.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1034356A (en) * 1988-01-21 1989-08-02 国家建材局苏州混凝土水泥制品研究院 Flyash activity exciting method
CN1136544A (en) * 1995-05-19 1996-11-27 路西泉 Active powdered coal ash fertilizer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1034356A (en) * 1988-01-21 1989-08-02 国家建材局苏州混凝土水泥制品研究院 Flyash activity exciting method
CN1136544A (en) * 1995-05-19 1996-11-27 路西泉 Active powdered coal ash fertilizer

Also Published As

Publication number Publication date
CN1194951A (en) 1998-10-07

Similar Documents

Publication Publication Date Title
Khedr et al. Characteristics of silica-fume concrete
Chindaprasirt et al. Hybrid high calcium fly ash alkali-activated repair material for concrete exposed to sulfate environment
CN107010853B (en) A kind of method that microwave synergy is activated S95 grade slag powder
WO2024022235A1 (en) Method for exciting steel slag powder cementing material via chemical-physical coupling, and application thereof
CN111205002A (en) High-toughness super-sulfate cement and preparation method thereof
CN114455899A (en) Fly ash cementing material
CN1050173A (en) Alkaline dregs and powder coal ash bricks exempted from firing
CN1903773A (en) Calcium enriched high strength concrete admixture and its preparation method and use method
Njau et al. Effect of Temperature on the Self-Healing Efficiency of Bacteria and on that of Fly Ash in Concrete
CN1069884C (en) Treating method for enhancing flyash activity
Venkatesan et al. Application potentials of conch shell powder as a bacterial carrier for enhancing the Micro-Mechanical performance of biogenic gypsum plaster
CN102643107B (en) Calcination-free desulfurized gypsum-based ceramsite concrete perforated brick
Yao et al. Review on autogenous self-healing technologies and multi-dimension mechanisms for cement concrete
CN1076672A (en) Mixed low-clinker active cement
Khalaf et al. Properties of red-mud-based geopolymers in the light of their chemical composition
CN114920475B (en) Titanium gypsum mineral powder-based composite cementing material
CN115466098B (en) Environment-friendly high-crack-resistance plastering mortar and preparation method thereof
CN101434464B (en) Preparation of fly ash highly activator
CN110317015A (en) A kind of composite high-strength concrete
CN1078572C (en) Grinding-helping and reinforcing additive of cement
CN1640845A (en) Concrete cementing material using desulfurized gypsum as accelerator
CN102219427A (en) Retarder for desulfurated building gypsum and preparation method thereof
CN1095450C (en) Active agent for fly ash concrete
Zhang et al. Enhancing the Interfacial Compatibility and Self-Healing Performance of Microbial Mortars by Nano-Sio2 Modified Basalt Fibers
CN101857386A (en) High-calcium flyash fixed sealing material and preparation method thereof

Legal Events

Date Code Title Description
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
C57 Notification of unclear or unknown address
DD01 Delivery of document by public notice

Addressee: Wang Xinjie

Document name: payment instructions

C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee