CN1077441A - Powdered coal ash composite additive - Google Patents
Powdered coal ash composite additive Download PDFInfo
- Publication number
- CN1077441A CN1077441A CN93100929A CN93100929A CN1077441A CN 1077441 A CN1077441 A CN 1077441A CN 93100929 A CN93100929 A CN 93100929A CN 93100929 A CN93100929 A CN 93100929A CN 1077441 A CN1077441 A CN 1077441A
- Authority
- CN
- China
- Prior art keywords
- molasses
- coal ash
- powdered coal
- composite additive
- ash composite
- 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.)
- Pending
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
- 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
-
- 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
- C04B2103/20—Retarders
- C04B2103/24—Hardening retarders
-
- 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
Abstract
The invention belongs to a kind of retarding additive, particularly a kind of powdered coal ash composite additive.By molasses and unslaked lime hybrid filtering, mix with flyash behind the formation molasses superplasticizer.The present invention is with low cost, and raw material is easy to get, and turns waste into wealth, and technology is simple, has not only improved early stage and later strength but also slow setting, can improve concrete engineering quality effectively.
Description
The invention belongs to a kind of retarding additive, particularly a kind of powdered coal ash composite additive.
In order to improve concrete strength, the normal employing dosed water reducer to obtain intensity preferably, the various water reducers of selling on the market, though can improve concrete strength to a certain extent, but all exist shortcomings such as complex process, cost height, price be expensive, particularly in mixing concrete after 28 days, intensity is on a declining curve, and this is totally unfavorable to the what concrete works.
Chinese patent notification number 1042533 discloses a kind of composite water-reducing agent for concrete, and it is made up of unslaked lime, sodium lignosulfonate, sodium sulfate and stopping composition.This water reducer both can participate in hydration reaction process in the concrete owing to add unslaked lime, can reduce the production cost of normal concrete water reducer again, but still kept away and unavoidably mix in the concrete intensity drawback on a declining curve after 28 days.
Chinese patent notification number 1038266 disclosed another kind of concrete high efficiency water reducing agents and concrete retarding type high efficiency water reducing agent.It is to be main raw material with the washing oil, is furnished with sulfuric acid, formaldehyde, caustic soda, molasses, calcium oxide and water.Be characterized in joint ash, strengthen but its raw material complexity that cost is high and exist too and mix in the concrete intensity shortcoming on a declining curve gradually after 28 days.
The objective of the invention is to avoid the weak point of above-mentioned prior art to provide a kind of and should improve early strength, make again and mix in the concrete after 28 days, even 180 days intensity keeps a kind of powdered coal ash composite additive of rising tendency.This admixture cost is low, technology simply, had not only improved early strong and later strength but also slow setting, increases stability, improves concrete engineering quality effectively.
The object of the present invention is achieved like this: by molasses and unslaked lime hybrid filtering, mix with flyash after forming sugared close water reducer.
The weight ratio of described molasses superplasticizer and flyash is 70～5: 30～90.
The making of molasses superplasticizer of the present invention, the calculation formula of sugared close diluting water amount
G＝ (m（r-r′）)/(r（r′-1）)
G represents molasses diluting water amount (kilogram) in the formula; M is molasses heavy (kilograms); R is a molasses proportion; R ' dilution back water reducer proportion, r ' gets 1.2 for good in the present invention.
The calculation formula of unslaked lime volume
Q＝ (α·m（A·16.38%+B·31.13%）)/(C)
Q represents unslaked lime weight (kilogram) in the formula; α is a correction factor, gets 1.02 in the present invention for good; A be in the molasses sucrose content in per-cent; B be in the molasses contents of monosaccharides in per-cent; 16.38% is that sucrose and CaO react normal percentage ratio; 31.13% reacts normal percentage ratio for monose and CaO; C is the percentage ratio of CaO content in the unslaked lime.
With molasses dilution back and unslaked lime mixing and stirring, in 20 ℃ of-40 ℃ of scopes, leave standstill, filter, make sugared close water reducer, to mix with flyash again, its weight ratio is sugared close water reducer 70～5%, flyash 30～95% forms powdered coal ash composite additive.
The present invention is owing to the powdered coal ash composite additive that utilizes flyash to make, and is with low cost, and raw material is easy to get, and turns waste into wealth, and not only improved early stage and later strength but also slow setting.
The present invention is different with the blending amount of sugared close water reducer according to flyash, can be made into the powdered coal ash composite additive of various different performances, as:
Flyash 30% molasses superplasticizer 70% is defined as FR
Flyash 95% molasses superplasticizer 5% is defined as FR
1
Flyash 90% molasses superplasticizer 10% is defined as FR
3
Test by relevant regulations in " GB8076-87 concrete admixture ", test-results is as showing:
Powdered coal ash composite additive is to the influence of concrete strength
| Intensity numbering in the length of time | Ultimate compression strength (MPa) | With the normal concrete strength ratio | ||||||||
| 3 days | 7 days | 28 days | 90 days | 180 days | 3 days | 7 days | 28 days | 90 days | 180 days | |
| Fo | 13.42 | 22.47 | 33.40 | 44.13 | 48.67 | 100 | 100 | 100 | 100 | 100 |
| FR | 20.40 | 31.33 | 41.90 | 50.33 | 58.30 | 152 | 139 | 125 | 114 | 120 |
| R | 20.43 | 33.47 | 42.50 | 49.00 | 48.47 | 152 | 149 | 127 | 111 | 100 |
| PR 1 | 14.63 | 30.30 | 42.33 | 47.27 | 52.00 | 109 | 135 | 127 | 107 | 107 |
| FR 2 | 22.40 | 40.57 | 54.00 | 55.50 | 57.70 | 167 | 181 | 162 | 126 | 119 |
| FR 3 | 14.40 | 33.30 | 50.60 | 60.93 | -- | 107 | 148 | 151 | 138 | -- |
Annotate:
Fo represents the not normal concrete intensity of fly ash compound additive;
FR represents to mix FR powdered coal ash composite additive 0.7%, intensity when cement consumption is identical with normal concrete;
R has and shows intensity when mixing R water reducer 0.5%;
FR
1FR is mixed in expression
1Powdered coal ash composite additive 10%, and intensity when in normal concrete, cutting cement with fly-ash-contained equivalent;
FR
2FR is mixed in expression
1Powdered coal ash composite additive 10%, the intensity when cement consumption is identical with normal concrete;
FR
3FR is mixed in expression
3Powdered coal ash composite additive 5%, intensity when cement consumption is identical with reference cement.
The test of intensity is found out from table, the concrete of fly ash compound additive, and in 3 days to 180 days each length of time, intensity all surpasses normal concrete.
Claims (2)
1, a kind of retarding additive, particularly a kind of powdered coal ash composite additive is characterized in that: by molasses and unslaked lime hybrid filtering, mix with flyash behind the formation molasses superplasticizer again.
2, powdered coal ash composite additive according to claim 1 is characterized in that: the weight ratio of said molasses superplasticizer and flyash is 70～5: 30～95.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93100929A CN1077441A (en) | 1993-01-21 | 1993-01-21 | Powdered coal ash composite additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93100929A CN1077441A (en) | 1993-01-21 | 1993-01-21 | Powdered coal ash composite additive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1077441A true CN1077441A (en) | 1993-10-20 |
Family
ID=4983315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93100929A Pending CN1077441A (en) | 1993-01-21 | 1993-01-21 | Powdered coal ash composite additive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1077441A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948261A (en) * | 2010-09-09 | 2011-01-19 | 镇江市鑫塔混凝土外加剂有限公司 | Early strength agent of concrete |
| CN101624278B (en) * | 2009-08-06 | 2012-09-19 | 白兴志 | Limy mixture |
-
1993
- 1993-01-21 CN CN93100929A patent/CN1077441A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101624278B (en) * | 2009-08-06 | 2012-09-19 | 白兴志 | Limy mixture |
| CN101948261A (en) * | 2010-09-09 | 2011-01-19 | 镇江市鑫塔混凝土外加剂有限公司 | Early strength agent of concrete |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |