CN102311246A - Anti-crack concrete - Google Patents
Anti-crack concrete Download PDFInfo
- Publication number
- CN102311246A CN102311246A CN2010101723955A CN201010172395A CN102311246A CN 102311246 A CN102311246 A CN 102311246A CN 2010101723955 A CN2010101723955 A CN 2010101723955A CN 201010172395 A CN201010172395 A CN 201010172395A CN 102311246 A CN102311246 A CN 102311246A
- Authority
- CN
- China
- Prior art keywords
- concrete
- cellulosic fibre
- crack concrete
- crack
- 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.)
- Pending
Links
Images
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an anti-crack concrete which comprises aggregate, concrete and additives and also comprises cellulose fibers. The anti-crack concrete disclosed by the invention has the advantages of improving the pore structure of cement paste and increasing the homogeneity of the concrete.
Description
Technical field
The present invention relates to the cement-base composite material of building material field, specifically a kind ofly improve the anti-crack concrete that water is pinched slurry pore texture and homogeneity.
Background technology
Normal concrete disposes the artificial stone material that forms through sclerosis again by gelling material, thick, thin aggregate and water by suitable proportion.From being detected, concrete section macroscopic view sees; Concrete is made up of the particles of aggregates of different size and shape and the hydrated cement slurry of discontinuous cementing properties medium; See microstructure this two mutually neither equally distributed each other from microcosmic angle, microstructure itself neither be spared matter.The microstructure of the cement slurry of contiguous macrobead aggregate usually and the grout in the system or mortar ontological existence than big-difference, i.e. interfacial transition zone.Because grout body and interfacial transition zone both are contained solid phase, hole and the microfracture of uneven distribution, dissimilar and quantity in the concrete; Cause concrete microfracture expansion so that concrete is subject to the influence of external environment; Objectionable impurities is invaded and is caused concrete deterioration; Reduce concrete durability, influence the work-ing life of concrete structures.
Summary of the invention
The object of the invention is that a kind of anti-crack concrete that improves the pore texture of cement slurry and improve homogeneity of concrete is provided.
The technical scheme that realizes above-mentioned purpose is following:
A kind of anti-crack concrete comprises aggregate, cement and admixture, also comprises cellulosic fibre.
Described admixture comprises mineral additive and chemical admixture.
The content of said cellulosic fibre is: fibre-bearing 0.6kg～2.7kg in every cubic meter of concrete.Can be according to concrete concrete design requirements and concrete Service Environment to the volume (kg/m of cellulosic fibre
3) adjust.
Said cellulosic fibre be with the needlebush wood chip with sulfite pulping, behind washing, bleaching, interpolation tenderizer and alkaline-resisting dose, manufacture paper with pulp into the reel pulpboard, make after the stripping and slicing.
The mean length of said cellulosic fibre is 2.1mm, and specific diameter is 17～20 μ m.
The present invention has added cellulosic fibre on the basis of available coagulation soil; Through cellulosic fibre " suction---release " effect; Promptly cellulosic fibre absorbs a certain amount of moisture when the early stage internal moisture of fresh concrete and concrete hardening is sufficient; Along with the evaporation of moisture in the carrying out of hydrated reaction of cement and the concrete and when making inside concrete humidity be unfavorable for the further aquation of cement; The moisture that absorbs before the cellulosic fibre discharges the further aquation that promotes cement slurry, thereby forms concrete " interior maintenance " function, improves its pore texture; Because of the water retention of fiber, weaken the trend of coarse aggregate surface aggregation moisture film simultaneously, reduced the defective that concrete bleeding has reduced hydrated cementitious slurry and coarse aggregate interfacial transition zone.
Description of drawings
Fig. 1 is the graph of pore diameter distribution of three embodiment of the present invention and Comparative Examples;
Fig. 2 is for to improve concrete plastic shrinkage cracks graphic representation according to ASTM C856 standard testing fiber.
Embodiment
Below in conjunction with specific embodiment and testing data the present invention is described further.
Below among each embodiment because of the present invention focusing on added cellulosic fibre on the basis of existing concrete, so the content of aggregate, cement and the admixture of prior art part etc. is not done detailed qualification.
Embodiment 1
A kind of anti-crack concrete comprises aggregate, cement and admixture, also comprises cellulosic fibre, and wherein the content of cellulosic fibre is: fibre-bearing 0.6kg in every cubic meter of concrete.
Embodiment 2
Differently with embodiment 1 be that the content of cellulosic fibre is every invention coagulation soil species cellulose fiber 0.9kg.
Embodiment 3
Differently with embodiment 1 be that the content of cellulosic fibre is every invention coagulation soil species cellulose fiber 1.2kg.
Test 1
(the gaging hole interval is 1.778～2134nm for mercury intrusion porosimetry, the MIP) pore structure of measurement 28d hardened cement paste in order to use mercury injection apparatus.Test has explained that cellulosic fibre is to the porosity of hydrated cementitious slurry and the optimization of pore size distribution.Cement slurry sample: cement mixed by water-cement ratio 0.29 with the cellulosic fibre of each volume respectively process clean slurry (nothing is mixed admixture).Fibers content is chosen 0,0.15%, 0.23%, 0.3% of cement quality respectively in the clean slurry, in the promptly corresponding concrete volume be respectively 0,0.6,0.9,1.2kg/m
3Table 1 is a sample 28d hardened cement paste pore structure parameter, cellulosic fibre mix the porosity that can reduce hardened cement paste, reduce mean pore size, wherein volume is the best with 0.23%.
Table 1 28d hardened cement paste pore structure parameter
Fig. 1 is the pore size distribution of hardened cement paste, and the pore size distribution that can make the reference cement slurry that mixes of fiber develops towards doing harm to hole and harmless hole direction less, optimizes pore size distribution.
Test 2
According to ASTM C856 standard maturing has been carried out petrographic analysis, the result shows: the extent of hydration of cement is higher than normal concrete in the cellulosic fibre concrete, and the cellulosic fibre inside concrete is non-microcracked, and there is tiny crack in normal concrete inside.
Test 3
High slump proportioning fibrous concrete with certain Transbay Bridge is a research object, and the normal concrete segregation phenomenon is serious, and slurry is faint to the parcel of aggregate, and a large amount of aggregates are deposited on slump bucket bottom; And the cellulosic fibre concrete, because the effect of fiber, concrete mortar is remarkable to the package action of aggregate, concrete rheological is good.In the method for sieving isolation test, the isolation rate of normal concrete is 41%, does not meet the requirement (one-level≤23%, secondary≤18%) in " European self-compacting concrete guide ", and concrete isolation rate in anti-isolation test of mixing cellulosic fibre is merely 8%.
Test 4
Carry out the plastic shrinkage cracking test of different cellulosic fibre volumes according to ASTM C1579, test-results is seen Fig. 2.Cellulosic fibre can increase substantially crack-resistant performance of concrete, at 0.9kg/m
3Cracking resistance improvement rate reaches more than 84% under the fibers content.Belong to limit by " fibrous concrete structure technology rules " and split performance ratings I level.
Claims (6)
1. an anti-crack concrete comprises aggregate, cement and admixture, it is characterized by: also comprise cellulosic fibre.
2. anti-crack concrete according to claim 1 is characterized by: cellulose fiber 0.6kg～2.7kg in every cubic meter of concrete.
3. anti-crack concrete according to claim 2 is characterized by: cellulose fiber 0.9～1.2kg/m in every cubic meter of concrete
3
4. anti-crack concrete according to claim 1 is characterized by: said admixture comprises mineral additive and chemical admixture.
5. anti-crack concrete according to claim 1 is characterized by: said cellulosic fibre for the needlebush wood chip with sulfite pulping, behind washing, bleaching, interpolation tenderizer and alkaline-resisting dose, manufacture paper with pulp into the reel pulpboard, make after the stripping and slicing.
6. anti-crack concrete according to claim 1 is characterized by: the mean length of said cellulosic fibre is 2.1mm, and specific diameter is 17～20 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101723955A CN102311246A (en) | 2010-05-14 | 2010-05-14 | Anti-crack concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101723955A CN102311246A (en) | 2010-05-14 | 2010-05-14 | Anti-crack concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102311246A true CN102311246A (en) | 2012-01-11 |
Family
ID=45424855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101723955A Pending CN102311246A (en) | 2010-05-14 | 2010-05-14 | Anti-crack concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102311246A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103739245A (en) * | 2013-12-19 | 2014-04-23 | 柳州正菱集团有限公司 | Anti-cracking concrete |
| CN103755233A (en) * | 2013-12-19 | 2014-04-30 | 柳州正菱集团有限公司 | Crack-resistant concrete |
-
2010
- 2010-05-14 CN CN2010101723955A patent/CN102311246A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103739245A (en) * | 2013-12-19 | 2014-04-23 | 柳州正菱集团有限公司 | Anti-cracking concrete |
| CN103755233A (en) * | 2013-12-19 | 2014-04-30 | 柳州正菱集团有限公司 | Crack-resistant concrete |
| CN103755233B (en) * | 2013-12-19 | 2016-01-20 | 柳州正菱集团有限公司 | A kind of anti-crack concrete |
| CN103739245B (en) * | 2013-12-19 | 2016-04-13 | 柳州正菱集团有限公司 | A kind of anti-crack concrete |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110105018B (en) | Modified coarse aggregate, fiber nano recycled concrete prepared from modified coarse aggregate and preparation method of fiber nano recycled concrete | |
| Bravo et al. | Durability performance of concrete with recycled aggregates from construction and demolition waste plants | |
| Braga et al. | Reduction of the cement content in mortars made with fine concrete aggregates | |
| Alyousif et al. | Effect of self-healing on the different transport properties of cementitious composites | |
| CN110395963B (en) | Construction waste recycled concrete | |
| Dávila-Pompermayer et al. | Lechugilla natural fiber as internal curing agent in self compacting concrete (SCC): Mechanical properties, shrinkage and durability | |
| Martínez-García et al. | Effect of pores on the mechanical and durability properties on high strength recycled fine aggregate mortar | |
| US9809496B2 (en) | Additive for cementitious materials | |
| CN109095823A (en) | A kind of preparation method for the permeable durable regeneration concrete of lightweight that assorted fibre is modified | |
| CN112374832B (en) | Recycled aggregate concrete and preparation method thereof | |
| CN103951330B (en) | A kind of bridge High-performance clean water concrete and preparation method thereof | |
| JP6644546B2 (en) | Cellulose nanofiber-supported reinforcing fiber for hydraulic molded article, hydraulic composition containing the same, hydraulic molded article | |
| Nayak et al. | Experimental studies on the effect of natural and synthetic fibers on properties of fresh and hardened mortar | |
| CN113354350B (en) | Processing technology of recycled aggregate concrete | |
| CN106045368A (en) | Admixture special for underwater concrete | |
| Li et al. | Leaching resistance of alkali-activated slag and fly ash mortars exposed to organic acid | |
| Nagrockienė et al. | Predicting frost resistance of concrete with different coarse aggregate concentration by porosity parameters | |
| CN102311246A (en) | Anti-crack concrete | |
| CN110759684B (en) | Double-aggregate cement mortar and preparation method thereof | |
| KR101363982B1 (en) | Lightweight concrete composition and manufacturing method thereof | |
| CN108033717B (en) | Recycled concrete mixture and preparation method and application thereof | |
| Li et al. | Effect of sand content on properties of self-consolidating, high-performance cementitious mortar | |
| RU2569422C1 (en) | Wood-cement mix | |
| Page et al. | Using alternative binders for the development of flax fibre reinforced mortars | |
| CN110668761A (en) | Concrete special for hydraulic engineering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120111 |