CN102887683A - High-strength self-compaction concrete and preparation method thereof - Google Patents
High-strength self-compaction concrete and preparation method thereof Download PDFInfo
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- CN102887683A CN102887683A CN2012103995101A CN201210399510A CN102887683A CN 102887683 A CN102887683 A CN 102887683A CN 2012103995101 A CN2012103995101 A CN 2012103995101A CN 201210399510 A CN201210399510 A CN 201210399510A CN 102887683 A CN102887683 A CN 102887683A
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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
- 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 provides a high-strength self-compaction concrete and a preparation method thereof. The high-strength self-compaction concrete comprises the following components in parts by mass: 550-700 parts of powder, 950-1100 parts of gravel, 630-750 parts of river sand, 115-145 parts of water and 8-15 parts of water reducing agent. The powder comprises the following components in parts by mass: 20-30 parts of cement, 35-50 parts of ore powder, 0-20 parts of fly ash and 15-30 parts of fly ash settling bead. The high-strength self-compaction concrete provided by the invention can greatly lower the cement consumption (only 20-30 wt% of the powder), is a low-carbon concrete, and can obviously lower the hydration heat of the concrete, thereby lowering the hydration temperature rise of the concrete and reducing the shrinkage caused by cement hydration.
Description
Technical field
The present invention relates to building material field, be specifically related to a kind of low hydration heat, low high strength self-compacting concrete that shrinks and preparation method thereof.
Background technology
At present the domestic concrete that generally strength grade is not less than C60 calls strong concrete, and it can significantly reduce sectional dimension after building structure, alleviate dead load, makes concrete structure more lightly attractive in appearance.But in high-strength concrete production preparation, often cement consumption is higher, and hydration heat is larger, and thermal stress and autogenous shrinkage bring hidden danger to the cracking of high-strength concrete, and especially in the large volume high-strength concrete, the concrete cracking risk is larger.
In high-strength concrete especially large volume high-strength concrete, adopt large volume mineral admixture can significantly reduce concrete aquation temperature rise, reduce concrete cracking risk.Result of study both domestic and external shows, flyash can reduce concrete aquation temperature rise effectively.But when cement consumption hour, concrete intensity can reduce, therefore, theoretically, effect that should each component of reasonably optimizing powder makes powder give play to optimized active function and filling effect, make concrete have higher density, slurry has good bonding capacity simultaneously.
Serviceability is the gordian technique of high strength self-compacting concrete preparation, need to have suitable work viscosity, so that pumping construction.At present, in the production of high-strength concrete, generally adopt admixture silicon ash to reduce concrete viscosity, but the silicon ash easily cause larger early stage self-constriction, totally unfavorable to concrete anticracking.
Therefore, the reasonably optimizing concrete mix, significantly reduce cement consumption, select the novel material that can improve the concrete work performance, adopt the high-performance compound additive, make high strength self-compacting concrete reach low aquation temperature rise, low performance of shrinking, form the low self-compacting concrete that shrinks of a kind of new low aquation temperature rise, to bring dramatic shift to the concrete preparation theory of modern high performance, simultaneously, will have huge pushing effect to the development of Concrete Industry.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of low hydration heat, low high strength self-compacting concrete that shrinks and preparation method thereof are provided.
The present invention solves the problems of the technologies described above the technical scheme of taking to be:
A kind of high strength self-compacting concrete, it is characterized in that, it comprises powder, rubble, river sand, water and water reducer, described powder comprises cement, breeze, flyash, reaches the heavy pearl of flyash, described powder: rubble: river sand: water: the mass ratio of water reducer is 550 ~ 700:950 ~ 1100:630 ~ 750:115 ~ 145:8 ~ 15, cement in the described powder: breeze: flyash: the mass ratio of the heavy pearl of flyash is 20 ~ 30:35 ~ 50:0 ~ 20:15 ~ 30.
In the such scheme, described high strength self-compacting concrete also includes Vltra tears and polyoxyethylene octylphenol ether, described Vltra tears accounts for 0.005% of described powder quality, and described polyoxyethylene octylphenol ether accounts for 0.5% of described water reducer quality.
In the such scheme, described water reducer is polycarboxylate high performance water-reducing agent.
In the such scheme, described cement is P
.O42.5, P
.I 52.5 and P
.In the II 52.5 any one; Described breeze is S95 level breeze; Described flyash is I level flyash; Described rubble is the rubble of the continuous grading of particle diameter between 4.75 ~ 19.5mm; Described river sand is medium sand; The Blain specific surface of the heavy pearl of described flyash is 700m
2/ kg ~ 1200m
2/ kg.
A kind of preparation method of high strength self-compacting concrete is characterized in that, it may further comprise the steps:
1) get the raw materials ready: according to powder: rubble: river sand: water: the mass ratio 550 ~ 700:950 of water reducer ~ 1100:630 ~ 750:115 ~ 145:8 ~ 15 take by weighing powder, rubble, river sand, water and water reducer, described powder comprises cement, breeze, flyash, and the heavy pearl of flyash, and according to cement: breeze: flyash: the mass ratio of the heavy pearl of flyash is that 20 ~ 30:35 ~ 50:0 ~ 20:15 ~ 30 take by weighing the heavy pearl of cement, breeze, flyash and flyash;
2) powder, rubble, river sand are placed concrete mixer stirred 30 seconds, water, water reducer are mixed, then the mixture of water, water reducer is poured in the concrete mixer, with powder, rubble, and river sand mix and blend 3 ~ 5 minutes.
In the such scheme, also comprise the step that takes by weighing 0.005% the Vltra tears that accounts for described powder quality and account for 0.5% polyoxyethylene octylphenol ether of described water reducer quality in the step 1), and step 2) is that Vltra tears and polyoxyethylene octylphenol ether and water, water reducer are mixed in, then the mixture of water, water reducer, Vltra tears and polyoxyethylene octylphenol ether poured in the concrete mixer.
In the such scheme, described water reducer is polycarboxylate high performance water-reducing agent.
In the such scheme, described cement is P
.O42.5, P
.I 52.5 and P
.In the II 52.5 any one; Described breeze is S95 level breeze; Described flyash is I level flyash; Described rubble is the rubble of the continuous grading of particle diameter between 4.75 ~ 19.5mm; Described river sand is medium sand; The Blain specific surface of the heavy pearl of described flyash is 700m
2/ kg ~ 1200m
2/ kg.
The invention has the beneficial effects as follows:
1. decrease cement consumption makes cement consumption only for 20 ~ 30% of powder total mass, is a kind of low-carbon (LC) concrete, can significantly reduce concrete hydration heat, thereby reduce concrete aquation temperature rise, reduces hydrated cementitious and the contraction that causes;
2. by large volume breeze and reduction water consumption, guarantee concrete intensity;
3. use the heavy pearl of flyash to improve the serviceability of concrete under low water binder ratio, especially reduce the viscosity of high-strength concrete, be convenient to pumping construction, can reduce the water reducer consumption simultaneously;
4. adopt polycarboxylate high performance water-reducing agent, Vltra tears and polyoxyethylene octylphenol ether can reduce concrete contraction and can improve concrete workability again;
Serviceability, ultimate compression strength and the volume stability of low aquation temperature rise low-shrinkage and high-strength self-compacting concrete of the present invention is all comparatively excellent.
Description of drawings
The high strength self-compacting concrete that Fig. 1 provides for embodiment 1 and the aquation temperature rise correlation curve of common high strength self-compacting concrete.
The high strength self-compacting concrete that Fig. 2 provides for embodiment 1 and the self-constriction correlation curve of common high strength self-compacting concrete.
The admixture that Fig. 3 provides for embodiment 2 and the self-constriction correlation curve of the high strength self-compacting concrete of admixture Vltra tears and polyoxyethylene octylphenol ether not.
The self-constriction correlation curve of the high strength self-compacting concrete of the heavy pearl consumption of the different flyash that Fig. 4 provides for embodiment 5.
Embodiment
The invention will be further described below in conjunction with drawings and Examples, and certain following embodiment should not be construed as limitation of the present invention.
Employed water reducer is commercially available polycarboxylate high performance water-reducing agent in following examples.
Embodiment 1
In the present invention, powder comprises cement, breeze, flyash, reaches the heavy pearl of flyash, hereinafter repeats no more.Wherein, the heavy pearl of flyash is the commercial goods by coal ash sorting.
According to cement: breeze: flyash: the mass ratio 25:45:10:20 of the heavy pearl of flyash takes by weighing the heavy pearl of cement, breeze, flyash and flyash.According to powder: rubble: river sand: water: the mass ratio 600:1020:690:125:9 of water reducer takes by weighing rubble, river sand, water and water reducer, and the concrete proportioning of the present embodiment is shown in a in the table 1.
Proportioning in the table 1 numbering a, b, c(b and c are as a comparative example) in all be added with the Vltra tears that accounts for powder quality 0.005% and account for the polyoxyethylene octylphenol ether of water reducer quality 0.5%, it is in table 1 and unlisted.
Wherein, cement is P
.O 42.5; The Blain specific surface of the heavy pearl of flyash is 700m
2/ kg; Breeze is S95 level breeze; Flyash is I level flyash; Described rubble is the rubble of the continuous grading of particle diameter between 4.75 ~ 19.5mm; River sand is medium sand.
In table 1 proportioning, b is the proportioning with the common high-strength concrete of the equal label of a, and c is and the proportioning of the high strength self-compacting concrete of the equal label of a, can finds out that the cement consumption of a and c is all larger.
The concrete placement that to produce according to a in the table 1 and c proportioning respectively at the pre-buried temperature measuring probe in the central position of die trial, detects the thermal history in 100 hours after the concrete placement, as shown in Figure 1 in cube insulation die trial of 1m3.With concrete standard die trial (150mm * 150mm * 150mm) formation of concrete test block, its 7 days, 28 days to be detected and 60 days intensity.Utilize noncontact concrete shrinkage deformation determinator measurement a and c from initial set to 28 concrete self-shrinkage in day length of time, recycling contact dial indicator measurement a and c are from the concrete self-shrinkage in day length of time in the 28 day length of time to 60, and draw a and c from initial set to the 60 concrete shrinkage rate curve in day length of time, as shown in Figure 2.
Table 1 proportioning one (kg/m
3)
The fundamental property of table 2 proportioning one
As can be seen from Table 2, the slump and the divergence of low aquation temperature rise low-shrinkage and high-strength self-compacting concrete a of the present invention are all excellent than b, c, and a can pass through U-shaped case smoothly, and viscosity is appropriate, and its time of decaying is 5 seconds, superior performance.From strength development, 7 days ultimate compression strength of a are lower slightly, but strength development in 28 days is normal, and gain in strength in 60 days is larger.
Can be found out by the temperature rise of a among Fig. 1 and the temperature rise curve of c, the Wen Feng of a hangs down 17 ℃ than the warm peak of c, and the whole piece temperature variation curve of a all significantly is lower than c, illustrates that low aquation temperature rise low-shrinkage and high-strength self-compacting concrete a of the present invention has the performance of low aquation temperature rise.
Can be seen by Fig. 2, the rate of self-contraction of low aquation temperature rise low-shrinkage and high-strength self-compacting concrete a of the present invention in 60 days is less than 0.2 ‰, and common high strength self-compacting concrete has reached 0.5 ‰, and from two shrinkage curves, a has significantly low contraction advantage.
The present embodiment also provides the preparation method of above-mentioned high strength self-compacting concrete, and it may further comprise the steps:
1) get the raw materials ready: according to powder: rubble: river sand: water: the mass ratio 600:1020:690:125:9 of water reducer takes by weighing powder, rubble, river sand, water and water reducer, described powder comprises cement, breeze, flyash, and the heavy pearl of flyash, according to cement: breeze: flyash: the mass ratio of the heavy pearl of flyash is that 25:45:10:20 takes by weighing cement, breeze, flyash and flyash sink pearl, take by weighing Vltra tears and polyoxyethylene octylphenol ether according to 0.005% the Vltra tears that accounts for described powder quality and 0.5% the polyoxyethylene octylphenol ether that accounts for described water reducer quality;
2) powder, rubble, river sand are placed concrete mixer stirred 30 seconds, water, water reducer, Vltra tears, polyoxyethylene octylphenol ether are mixed, then the mixture of water, water reducer, Vltra tears and polyoxyethylene octylphenol ether is poured in the concrete mixer, with powder, rubble, and river sand mix and blend 3 ~ 5 minutes.
Embodiment 2
The concrete material proportioning of the present embodiment is shown in the d in the table 3, and the preparation method is with embodiment 1, and the d that is the present embodiment with a difference among the embodiment 1 is admixture Vltra tears and polyoxyethylene octylphenol ether not.In the present embodiment, the Blain specific surface of the heavy pearl of flyash is 1200m
2/ kg.
Table 3 proportioning two (kg/m
3)
The fundamental property of table 4 proportioning two
As can be seen from Figure 3, the self-desiccation shrinkage in the concrete a aquation of admixture Vltra tears and polyoxyethylene octylphenol ether 3 days is lower, thereby the overall shrinkage amount is also lower, and d compares with concrete, the self-constriction of concrete a low 20%.
Embodiment 3
The present embodiment is respectively take the total amount of powder as 550kg/m
3And 700kg/m
3Prepare low aquation temperature rise low-shrinkage and high-strength self-compacting concrete e and f, its proportioning raw materials is as shown in table 5, and component is identical with embodiment 1.The preparation method is with embodiment 1.
In the present embodiment, concrete mix e, f all add the Vltra tears of powder quality 0.005% and the polyoxyethylene octylphenol ether of water reducer quality 0.5%, and it is unlisted in table 5.
Table 5 proportioning three (kg/m
3)
The fundamental property of table 6 proportioning three
Data by table 5 and table 6 can be found out, use 550 kg/m
3With 700 kg/m
3All can realize the present invention, but the powder consumption is when higher, concrete intensity is also higher, therefore adjusts the high strength self-compacting concrete that the powder consumption can be prepared different intensity grades.
Embodiment 4
The concrete material proportioning of the present embodiment is shown in g and h in the table 7, and only cement type is different from embodiment 1 on the component.The cement that the present embodiment is selected is respectively P
.I 52.5 and P
.II 52.5.The preparation method is with embodiment 1.
In the present embodiment, concrete mix g and h all add the Vltra tears of powder quality 0.005% and the polyoxyethylene octylphenol ether of water reducer quality 0.5%, and it is unlisted in table 5.
Table 7 proportioning four (kg/m
3)
The fundamental property of table 8 proportioning four
Data by table 8 are found out, adopt P
.O 42.5, P
.I 52.5 and P
.The fundamental property of the low aquation temperature rise low-shrinkage and high-strength self-compacting concrete that II 52.5 makes is suitable.It is in the nature, and cement clinker contained in the dissimilar cement is different, in the situation that the grog type is identical, can determine by the actual cement clinker quality that converts the usage quantity of different model cement, and its low aquation temperature rise is identical with low principle of shrinking.
The concrete material proportioning of the present embodiment is shown in i and j in the table 9, and the component of i is identical with embodiment 1, and the component difference from Example 1 of j is that j has saved the flyash component.The heavy pearl usage ratio of two groups of concrete flyash of i and j accounts for respectively 15% and 30% of total powder quality.The preparation method is with embodiment 1.
In the present embodiment, concrete mix i, j all add the Vltra tears of powder quality 0.005% and the polyoxyethylene octylphenol ether of water reducer quality 0.5%, and it is unlisted in table 9.
Table 9 proportioning five (kg/m
3)
The fundamental property of table 10 proportioning five
As can be seen from Figure 4, the heavy ratio of pearl in concrete of flyash all can make high strength self-compacting concrete when being 15% and 30%, and its ultimate compression strength is substantially suitable, but when the heavy pearl volume of flyash is 30%, the consumption of water reducer decreases, and serviceability is slightly excellent, and early stage self-constriction is lower.
Need to prove, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from aim and the scope of technical solution of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. high strength self-compacting concrete, it is characterized in that, it comprises powder, rubble, river sand, water and water reducer, described powder comprises cement, breeze, flyash, reaches the heavy pearl of flyash, described powder: rubble: river sand: water: the mass ratio of water reducer is 550 ~ 700:950 ~ 1100:630 ~ 750:115 ~ 145:8 ~ 15, cement in the described powder: breeze: flyash: the mass ratio of the heavy pearl of flyash is 20 ~ 30:35 ~ 50:0 ~ 20:15 ~ 30.
2. high strength self-compacting concrete as claimed in claim 1, it is characterized in that, described high strength self-compacting concrete also includes Vltra tears and polyoxyethylene octylphenol ether, described Vltra tears accounts for 0.005% of described powder quality, and described polyoxyethylene octylphenol ether accounts for 0.5% of described water reducer quality.
3. high strength self-compacting concrete as claimed in claim 1 or 2 is characterized in that, described water reducer is polycarboxylate high performance water-reducing agent.
4. high strength self-compacting concrete as claimed in claim 1 is characterized in that, described cement is P
.O42.5, P
.I 52.5 and P
.In the II 52.5 any one; Described breeze is S95 level breeze; Described flyash is I level flyash; Described rubble is the rubble of the continuous grading of particle diameter between 4.75 ~ 19.5mm; Described river sand is medium sand; The Blain specific surface of the heavy pearl of described flyash is 700m
2/ kg ~ 1200m
2/ kg.
5. the preparation method of a high strength self-compacting concrete is characterized in that, it may further comprise the steps:
1) get the raw materials ready: according to powder: rubble: river sand: water: the mass ratio 550 ~ 700:950 of water reducer ~ 1100:630 ~ 750:115 ~ 145:8 ~ 15 take by weighing powder, rubble, river sand, water and water reducer, described powder comprises cement, breeze, flyash, and the heavy pearl of flyash, and according to cement: breeze: flyash: the mass ratio of the heavy pearl of flyash is that 20 ~ 30:35 ~ 50:0 ~ 20:15 ~ 30 take by weighing the heavy pearl of cement, breeze, flyash and flyash;
2) powder, rubble, river sand are placed concrete mixer stirred 30 seconds, water, water reducer are mixed, then the mixture of water, water reducer is poured in the concrete mixer, with powder, rubble, and river sand mix and blend 3 ~ 5 minutes.
6. preparation method as claimed in claim 5, it is characterized in that, also comprise the step that takes by weighing 0.005% the Vltra tears that accounts for described powder quality and account for 0.5% polyoxyethylene octylphenol ether of described water reducer quality in the step 1), and step 2) is that Vltra tears and polyoxyethylene octylphenol ether and water, water reducer are mixed in, then the mixture of water, water reducer, Vltra tears and polyoxyethylene octylphenol ether poured in the concrete mixer.
7. preparation method as claimed in claim 5 is characterized in that, described water reducer is polycarboxylate high performance water-reducing agent.
8. preparation method as claimed in claim 5 is characterized in that, described cement is P
.O42.5, P
.I 52.5 and P
.In the II 52.5 any one; Described breeze is S95 level breeze; Described flyash is I level flyash; Described rubble is the rubble of the continuous grading of particle diameter between 4.75 ~ 19.5mm; Described river sand is medium sand; The Blain specific surface of the heavy pearl of described flyash is 700m
2/ kg ~ 1200m
2/ kg.
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| CN104891884A (en) * | 2015-05-20 | 2015-09-09 | 中民筑友有限公司 | C35 low-gel-material self-compacting concrete and preparation method thereof |
| CN104891901A (en) * | 2015-05-20 | 2015-09-09 | 中民筑友有限公司 | C35 low-gel-material self-compacting wear-resistant concrete and preparation method thereof |
| CN105016671A (en) * | 2014-04-29 | 2015-11-04 | 黄贺明 | Superfluid self-compacting concrete and preparing method thereof |
| CN105645894A (en) * | 2015-12-29 | 2016-06-08 | 武汉武新新型建材股份有限公司 | High-performance concrete with large mixing amount of mineral powder and manufacturing method of high-performance concrete |
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| CN109400022A (en) * | 2018-11-13 | 2019-03-01 | 江苏省安捷岩土工程有限公司 | A kind of ultra-large volume high intensity low hydration heat concrete |
| CN109776052A (en) * | 2019-03-15 | 2019-05-21 | 长安大学 | A kind of fiber reinforced lightweight aggregate concrete of self-compaction and preparation method thereof |
| CN111039621A (en) * | 2019-12-23 | 2020-04-21 | 佛山市新利海混凝土有限公司 | High-strength fine stone self-compacting concrete and fine stone screening device |
| CN112194418A (en) * | 2020-10-23 | 2021-01-08 | 广东龙湖科技股份有限公司 | Wood fiber self-compacting concrete |
| CN115925338A (en) * | 2022-11-30 | 2023-04-07 | 广州市泰和混凝土有限公司 | Concrete for building and preparation method thereof |
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