CN1071401A - Retardant for alkali slag cement - Google Patents
Retardant for alkali slag cement Download PDFInfo
- Publication number
- CN1071401A CN1071401A CN91108316A CN91108316A CN1071401A CN 1071401 A CN1071401 A CN 1071401A CN 91108316 A CN91108316 A CN 91108316A CN 91108316 A CN91108316 A CN 91108316A CN 1071401 A CN1071401 A CN 1071401A
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- China
- Prior art keywords
- retardant
- slag cement
- alkali slag
- cement
- alkali
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Retardant for alkali slag cement belongs to building material technical field.The technical problem that needs to solve is extremely short to the rate of set of the alkali slag cement timed interval too fast and first, final set, hinders and applies.The invention reside in and determine a kind of effective retardant for alkali slag cement, for applying of alkali slag cement creates conditions.Technical characterictic is to adopt nitrate of baryta and Portland clinker preparation.Retardant of the present invention can delay the time of coagulation of alkali slag cement effectively, makes it reach " GB " to the silicate cement requirement of time of coagulation.Have that efficient height, adaptability are strong, easy to use, characteristic such as have no side effect.Be applicable to construction work.
Description
Retardant for alkali slag cement belongs to building material technical field.
The technical feature of prior art overview and alkali slag cement: alkali slag cement is made up of levigate blast furnace slag and alkaline constituents, it is a kind of good new and effective building cementing material, have a series of good performances, as early strong, high reactivity and high-durability, and production energy consumption is low, can effectively utilize industrial residue etc.Therefore, in construction work, be extensive day by day to its application.Yet the disadvantage of alkali slag cement is to be easy to generate the rapid hardening phenomenon.Particularly high-strength alkali slag cement, its presetting period generally has only 5～15 minutes, and the timed interval first, final set is extremely short again, is generally 2～7 minutes.Obviously, the fast like this cement that coagulates speed is difficult to be applied in construction work, is badly in need of solving the slow setting problem of alkali slag cement, but becomes the precondition that it is applied.
The slow setting problem of alkali slag cement has caused the extensive concern of Chinese scholars, the particularly Soviet Union, since this century the seventies just this problem is studied, and obtained certain achievement.At present, the approach that solves alkali slag cement slow setting problem has: technological measure and mix retardant, the former comprises the prolongation churning time, adopt secondary stirring and slag is heat-treated, but because the enforcement of processing method, to cause complex technical processization, facility investment increase and engineering construction decrease in efficiency, and, particularly be difficult to be applied in the cast-in-place engineering so be difficult to apply.Therefore, study effective retardant for alkali slag cement, but become the fundamental way of its slow setting problem of solution.
Evidence, the slow setting material of using always in the ordinary Portland cement, very little to no retarding action of condensing of alkali slag cement or effect, and for example organosilicon surfactant and sulfurous acid alcohol waste residue etc., condensing of alkali slag cement there is certain retarding action, but to alkaline slag and alkalimetal silicate or alkali metal hydroxide is the alkali slag cement of alkaline constituents, all the time can not reach related standards its time of coagulation to the silicate cement requirement of time of coagulation, in view of this present situation, the Soviet Union in 1989 the promulgation " alkali slag agglutination material technical regulation " (Ty67-1020-89), its 2.10 regulations: except that soluble glass is made the gelling material of alkaline constituents, presetting period to various agglutination materials must not be early than 30 minutes, and its final set must not be later than 12 hours; Simultaneously, regulation again in 2.12: make the agglutination material of alkaline constituents with soluble silicate, its initial set must not be early than 20 minutes, and final set must not be later than 12 hours.This shows, this subject study is got the earliest Soviet Union, also do not find effective retardant.
Reference: " research of new structural material alkali slag (jk) quality concrete ", " silicate building products " 1988.1 Pu hearts are sincere etc.
Purpose of the present invention: in view of alkali slag cement is a kind of good new and effective building cementing material, have good performance, and the energy consumption of producing is low, can effectively utilize characteristics such as industrial residue.But its rate of set is too fast, and just, the timed interval of final set is extremely short again, is applied so be an impediment in construction work.The invention reside in and determine a kind of effective retardant for alkali slag cement, for applying of alkali slag cement creates conditions.
The present invention tests through analysis-by-synthesis, has determined the compound method of a kind of high-efficient retarder of alkali slag cement, adopts the preparation of nitrate of baryta and Portland clinker, makes new and effective retardant for alkali slag cement.(hereinafter to be referred as retardant)
Its prescription is: (a) Portland clinker is about 2% of a slag weight, and (b) volume of nitrate of baryta is decided on the label of alkali slag cement, about 3% of about slag weight, and both gross weights are controlled at below 5% of slag weight usually.
Its using method is: (a) retardant can add when concrete stirs, but must be earlier with its grinding to cement fineness (about 3000cm
2/ g), (b) when slag milling, add retardant.
The introducing of this retardant of the present invention can delay time of coagulation of slag cement effectively, make it reach " GB " GB175-85 to the silicate cement requirement of time of coagulation.
Its performance is as follows:
1, retardant is to the alkali slag cement influence of time of coagulation
Annotate: a. cement fineness S=5800cm
2/ g
B. test temperature t=17 ℃
2, retardant is to the influence of alkali-slag concrete intensity
Annotate: 1, molecule number is actual measurement value of concrete strength (MPa) in the table (2), and denominator is the ratio with normal concrete intensity in corresponding length of time.
2, cement fineness S=4573cm
2/ g
3, coarse aggregate is the Wingdale rubble, and maximum particle diameter is 20 millimeters, and fine aggregate is a flour sand, and fineness modulus is 0.63
4, test specimen normal curing
5, volume accounts for the percentage ratio of slag weight in the table for retardant weight.
The advantage that the present invention compared with prior art has:
By international online retrieval and manual information retrieval, find out and still do not have similar retardant both at home and abroad at present that prove that it has novelty, creativeness and suitability, retardant for alkali slag cement also has the following advantages simultaneously:
A, efficient height.By adjusting its volume, can delay the time of coagulation of slag cement effectively, make it satisfy GB175-85 to the silicate cement requirement of time of coagulation.Under the prerequisite of final set earlier than 12 hours, adjust volume, can make the presetting period of high-strength alkali slag cement owing to be extended down to 1～3 hour in 5～15 minutes, and make the strength development of alkali-slag concrete reach GB GB8076-87 simultaneously containing the requirement of retardant concrete strength development speed.
B, adaptability are strong, and its not only is fit in what preparation, the low grade alkali slag cement, and be more suitable for the high-strength and superelevation highly basic slag cement of what preparation.
C, easy to use, it both can add when concrete stirs, and also can add when cement grinding, did not increase the difficulty in production technique or the construction.
D, have no side effect, in the composition of retardant for alkali slag cement, do not contain any objectionable constituent (as cl
-, so
2- 4Deng), therefore, can not influence the steel protection property and other weather resistance of alkali slag cement.
E, reasonable price, the material that retardant adopted all has abundant Industrial products, compares with retardant such as organosilicon surfactants, it is cheap, and volume is suitable, therefore, to its introducing, can not cause fluctuating widely of alkali slag cement price, have broad application prospects.
The best way that realizes, retardant is prepared by its prescription requirements, according to repetition test, advises retardant added when the cement grinding and slag mix grinding together, makes its abundant homogenize.Those skilled in the art can realize.
Claims (3)
1, a kind of compound method of retardant for alkali slag cement is characterized in that adopting the preparation of nitrate of baryta and Portland clinker, makes new and effective retardant for alkali slag cement.(hereinafter to be referred as retardant).
2, retardant as claimed in claim 1 is characterized in that its prescription is:
A. Portland clinker is about 2% of a slag weight,
B. the volume of nitrate of baryta is decided on the label of alkali slag cement, about 3% of about slag weight,
Usually both gross weights are controlled at below 5% of slag weight.
3, a retardant as claimed in claim 1 is characterized in that using method is:
(a) retardant can add when concrete stirs, but must be earlier with its grinding to cement fineness (about 3000cm
2/ g)
(b) when slag milling, add retardant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91108316A CN1040529C (en) | 1991-10-09 | 1991-10-09 | Retardant for alkali slag cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91108316A CN1040529C (en) | 1991-10-09 | 1991-10-09 | Retardant for alkali slag cement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1071401A true CN1071401A (en) | 1993-04-28 |
| CN1040529C CN1040529C (en) | 1998-11-04 |
Family
ID=4909215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91108316A Expired - Fee Related CN1040529C (en) | 1991-10-09 | 1991-10-09 | Retardant for alkali slag cement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1040529C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699251B (en) * | 2005-04-29 | 2010-09-15 | 华南理工大学 | Method for preparing alkali-activated-carbonate/slag gel material |
| CN105060758A (en) * | 2015-08-26 | 2015-11-18 | 西南科技大学 | Method for preparing alkali-slag cement retarder through jarosite slag |
-
1991
- 1991-10-09 CN CN91108316A patent/CN1040529C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699251B (en) * | 2005-04-29 | 2010-09-15 | 华南理工大学 | Method for preparing alkali-activated-carbonate/slag gel material |
| CN105060758A (en) * | 2015-08-26 | 2015-11-18 | 西南科技大学 | Method for preparing alkali-slag cement retarder through jarosite slag |
| CN105060758B (en) * | 2015-08-26 | 2017-01-18 | 西南科技大学 | Method for preparing alkali-slag cement retarder through jarosite slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1040529C (en) | 1998-11-04 |
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