CN105801053A - Self-compacting concrete with high content of fly ash C40 - Google Patents
Self-compacting concrete with high content of fly ash C40 Download PDFInfo
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- CN105801053A CN105801053A CN201610149255.3A CN201610149255A CN105801053A CN 105801053 A CN105801053 A CN 105801053A CN 201610149255 A CN201610149255 A CN 201610149255A CN 105801053 A CN105801053 A CN 105801053A
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- compacting concrete
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- 239000010881 fly ash Substances 0.000 title claims abstract description 50
- 239000011376 self-consolidating concrete Substances 0.000 title claims abstract description 42
- 239000004567 concrete Substances 0.000 claims abstract description 52
- 239000004568 cement Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 9
- 239000004575 stone Substances 0.000 claims abstract description 7
- 239000012615 aggregate Substances 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000036571 hydration Effects 0.000 abstract description 6
- 238000006703 hydration reaction Methods 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 3
- 239000011707 mineral Substances 0.000 abstract 3
- 239000000843 powder Substances 0.000 abstract 3
- 239000002253 acid Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- C04B28/04—Portland cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a high-volume fly ash C40 self-compacting concrete, which consists of a cementing material, an aggregate, an additive and water, wherein the cementing material consists of cement and an admixture, the admixture comprises fly ash and mineral powder, the aggregate consists of coarse aggregate and fine aggregate, the additive is a special self-compacting polycarboxylic acid water reducer, and the dosage of each material in each cubic concrete is as follows: 200-280 kg of cement, 0-90 kg of mineral powder, 125-200 kg of fly ash, 700-1000 kg of sand, 800-950 kg of stone, 0.3-10 kg of water reducing agent and 110-170 kg of water. The fly ash C40 self-compacting concrete with large doping amount utilizes the compound doping of the fly ash and mineral powder, and the large doping amount of the fly ash not only reduces the cement consumption and the concrete production cost, but also can reduce the cement hydration heat, improve the concrete workability and improve the concrete durability.
Description
Technical field
The present invention relates to a kind of self-compacting concrete, particularly to a kind of flyash in great mixed amount C40 self-compacting concrete.
Background technology
Self-compacting concrete be a kind of can the high performance concrete of closely knit molding without vibrate (or slightly vibrating) under self gravitation effect.Because it has the workability of excellence, do not need manually additionally to vibrate in the stage of building, rely on the deadweight can closely knit mold filling, the noise in concrete construction can not only be significantly reduced, save labour force, improve production efficiency, also can solve the leakage in conventional concrete construction shake, cross pitted skin that the anthropic factor such as shake causes, bleeding or because reinforcing bar is dense, structure complicated difficult the problem such as to vibrate, thus improving the quality of concrete works.But, the material composition of self-compacting concrete generally has two features: (1) gel material content is big, and concrete strength grade is high；(2) quality requirements of raw material (including Binder Materials and aggregate) is high.Wherein self-compacting concrete gel material content is typically in more than 500kg/m3, and cement consumption is typically in more than 350kg/m3.Cement is the main raw material(s) in self-compacting concrete Binder Materials glue material, the higher meeting of cement consumption is bigger than normal easily caused by concrete shrinkage value because hydration heat of cement is too high, concrete Crack Control and the concrete durability of raising is unfavorable, the problems such as isolation and bleeding particularly easily occur when preparation C40 and following low grade self-compacting concrete.It addition, cement consumption is many, price is high so that holding at high price of self-compacting concrete.Owing to above various reasons makes the popularization and application of self-compacting concrete be restricted.Therefore, rationally mixing appropriate admixture is one of important channel preparing low cost C40 self-compacting concrete.
Flyash, breeze broadly fall into industrial residue, and cheap, aboundresources.Concrete rationally mixes flyash and not only can reduce cost with breeze, concrete performance after improving workability of concrete and hardening, also can reduce concrete cement temperature peak of hydration, and then improve concrete durability.Additionally, rationally mix a large amount of flyash and breeze to be conducive to the protection of comprehensive utilization of resources and ecological environment.
But for a long time, owing to there is idea and technical obstacle, on admixture consumption, the volume on flyash and the impact on concrete mechanics and durability are held than more conservative attitude always.Generally, building trade generally uses the coal ash instead cement of 15%～20% to use.In " technology of high performance concrete code ", still regulation flyash ratio in concrete gel material must not exceed 30%.There are some researches show that both at home and abroad high volume fly ash concrete is applied in building structure and had practical feasibility, but currently without being specifically designed for C40 self-compacting concrete, the application that flyash is combined with C40 self-compacting concrete with breeze compound high volume fly ash concrete.
Summary of the invention
For solving the problems referred to above, present invention aim at providing a kind of flyash in great mixed amount C40 self-compacting concrete.Utilize flyash and breeze combined addition, flyash in great mixed amount, not only reduce cement consumption, reduce concrete production cost, also can reduce hydration heat of cement, improve workability of concrete, improve concrete durability.
For realizing the purpose of the present invention, the technical scheme is that
A kind of flyash in great mixed amount C40 self-compacting concrete, it is characterized in that, described concrete is made up of Binder Materials, aggregate, additive and water, described Binder Materials is made up of cement, admixture, admixture comprises flyash and breeze, aggregate is made up of coarse aggregate and fine aggregate, additive is the special poly carboxylic acid series water reducer of self-compaction, in every cube of concrete, each material usage is as follows: cement 200 ~ 280kg, breeze 0 ~ 90kg, flyash 125 ~ 200kg, sand 700 ~ 1000kg, stone 800 ~ 950kg, water reducer 0.3 ~ 10kg, water 110 ~ 170kg.
Cement is portland cement or the Portland cement of 42.5 strength grades and above low cost.
Described flyash is GB I level, II grade, III grade low calcium or high-calcium fly ass.
Described breeze is S105 or S95 breeze.
Described fine aggregate is river sand, medium coarse sand or Machine-made Sand, and modulus of fineness is followed successively by 1.0 ~ 1.8,2.3 ~ 2.8,3.5 ~ 4.1.
Described coarse aggregate is rubble, cobble, and its medium stone is the discontinuous grating of 5 ~ 20mm, and cobble is 5 ~ 20mm continuous grading.
Described additive is the special poly carboxylic acid series water reducer of self-compaction, and solid content is 10 ~ 30%.
In the present invention, flyash and breeze belong to industrial waste, and cheap, aboundresources.By breeze, flyash and cement composition Binder Materials, not only can reduce cement consumption, reduce concrete production cost, and by breeze, after flyash compound mixes concrete, hydration process can excite mutually and produce composite cementitious material, two kinds of composite materials are learnt from other's strong points to offset one's weaknesses the advantage and complementary action that can give full play to flyash and breeze, can effectively improve concrete properties, make up the defect that independent adding coal ash makes early age strength of concrete reduce, concrete cement temperature peak of hydration can be reduced, improve concrete durability, ensure that the xoncrete structure after hardening is more closely knit.And flyash in great mixed amount is to reducing Cost of Concrete advantageously, concrete performance after can being effectively improved workability of concrete and hardening, improves concrete density, the anti-carbonization of Concrete Structure and resisting chloride ion penetration leaching erosion performance.
Detailed description of the invention
The preferred embodiment of the present invention:
Raw material: cement is silicate or the Portland cement of 42.5 strength grades and above low cost, flyash is GB I level, II grade, III grade low calcium or high-calcium fly ass, breeze is S105 or S95 breeze, fine aggregate is river sand, medium coarse sand or Machine-made Sand, modulus of fineness is followed successively by 1.0 ~ 1.8,2.3 ~ 2.8,3.5 ~ 4.1, coarse aggregate is rubble, cobble, its medium stone is the discontinuous grating of 5 ~ 20mm, cobble is 5 ~ 20mm continuous grading, additive is the special poly carboxylic acid series water reducer of self-compaction, and solid content is 10 ~ 30%.
Preparation method: first with the abundant moistening blender of the cement mortar of the water-cement ratio identical with C40 self-compacting concrete, then sandstone is put into blender, Binder Materials proportioning further according to design, weigh corresponding Binder Materials and add in blender, stirring 1 ~ 2min adds the special polycarboxylate water-reducer of self-compaction and water after mix is uniform, and stirring 2min can obtain C40 self-compacting concrete.As shown in table 1 below be embodiment 1 ~ 5 be embodied as match ratio.
Table 1 flyash in great mixed amount C40 mix parameters of high-strength self-compacting concrete
Illustrate: C, K, F, sand, stone and glue material total amount unit are kg/m3, and water reducer unit is kg/m3, and wherein C represents that cement, K represent that breeze, F represent flyash.
As can be seen from the table flyash can singly mix or with breeze compound, the consumption of flyash is the 27% ~ 48% of glue material total amount.
Self-compacting concrete key property carries out self-compacting concrete fillibility (comprising slump flow test, T500 expansion time), gap by property (slump flow test and J ring divergence difference) and education resistance (V-type funnel passes through the time) detection according to JGJ/T283-2012 " self-compacting concrete application technology code " and CECS203:2006 " self-compacting concrete application technology code ", and testing result is as shown in table 2 below.
The key property of table 2 flyash in great mixed amount C40 self-compacting concrete
Illustrate: gap is slump flow test and J ring divergence difference (mm) by property.
Touching painted diameter on concrete extension analyzer at the beginning of the concrete outer rim that slump flow test and T500s(spread from table is the time of the circumference of 500mm) can be seen that C40 self-compacting concrete divergence prepared by flyash in great mixed amount of the present invention is all higher than more than 660mm, T500s is all within 20s, self-compacting concrete two grades even primary standard can be reached, and the scenes such as isolation, bleeding does not occur in the concrete prepared.Show that fresh concrete slump flow test and J ring divergence difference are all within 25mm from gap by property data, illustrate that the concrete workability prepared is better, aggregate clogging does not occur.From table, V-type funnel testing result can be seen that, the C40 concrete prepared has good toughness and education resistance, and the V-type funnel concrete delivery time all reaches the standard within self-compacting concrete 25s.Can be seen that from the comprcssive strength of concrete test block, designed by the present invention, glue material total amount is 420kg/m3, and when single fly ash volume is up to 48%, 28d mark supports intensity all can meet C40 self-compacting concrete trial strength requirement.Composite fly ash is with in breeze situation, and designed C40 self-compacting concrete 28d mark supports intensity all far above C40 self-compacting concrete trial strength requirement.It can thus be assumed that flyash in great mixed amount C40 self-compacting concrete of the present invention meets the standard required by self-compacting concrete, there is feasibility.
The anti-carbonation properties of table 3 flyash in great mixed amount C40 self-compacting concrete
Illustrate: the unit of carbonation depth is mm.
By embodiment 1 ~ 5 experimental formula formation of concrete block, mark puts into carbonization case after supporting 28d, test according to " Standard for test methods of longterm performance and durability of ordinary concrete standard " GB/T50082 2009, it is thus achieved that the carbonation depth data of each age, in Table 3.As can be seen from Table 3, the concrete density of the embodiment of the present invention 1 ~ 5 is very big, the diffusion of gas very not easily, so carbonizing degree is only small.It can be said that the concrete resisting carbonization of the present invention is very strong.
Concrete has extraordinary anti-permeability performance, and electric flux is between 350 ~ 650 coulombs, and normal concrete electric flux, then between 1000 ~ 2000 coulombs, illustrates that this xoncrete structure is closely knit, and pore structure is reasonable, has good durability.
Above-described embodiment is illustrative principles of the invention and effect thereof only; and the embodiment that part is used, for the person of ordinary skill of the art, without departing from the concept of the premise of the invention; can also making some deformation and improvement, these broadly fall into protection scope of the present invention.
Claims (7)
1. a flyash in great mixed amount C40 self-compacting concrete, it is characterized in that, described concrete is made up of Binder Materials, aggregate, additive and water, described Binder Materials is made up of cement, admixture, admixture comprises flyash and breeze, aggregate is made up of coarse aggregate and fine aggregate, additive is the special poly carboxylic acid series water reducer of self-compaction, in every cube of concrete, each material usage is as follows: cement 200 ~ 280kg, breeze 0 ~ 90kg, flyash 125 ~ 200kg, sand 700 ~ 1000kg, stone 800 ~ 950kg, water reducer 0.3 ~ 10kg, water 110 ~ 170kg.
2. flyash in great mixed amount C40 self-compacting concrete according to claim 1, it is characterised in that cement is portland cement or the Portland cement of 42.5 strength grades and above low cost.
3. flyash in great mixed amount C40 self-compacting concrete according to claim 1, it is characterised in that described flyash is GB I level, II grade, III grade low calcium or high-calcium fly ass.
4. flyash in great mixed amount C40 self-compacting concrete according to claim 1, it is characterised in that described breeze is S105 or S95 breeze.
5. flyash in great mixed amount C40 self-compacting concrete according to claim 1, it is characterised in that described fine aggregate is river sand, medium coarse sand or Machine-made Sand, and modulus of fineness is followed successively by 1.0 ~ 1.8,2.3 ~ 2.8,3.5 ~ 4.1.
6. flyash in great mixed amount C40 self-compacting concrete according to claim 1, it is characterised in that described coarse aggregate is rubble, cobble, its medium stone is the discontinuous grating of 5 ~ 20mm, and cobble is 5 ~ 20mm continuous grading.
7. flyash in great mixed amount C40 self-compacting concrete according to claim 1, it is characterised in that described additive is the special poly carboxylic acid series water reducer of self-compaction, and solid content is 10 ~ 30%.
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| CN107382210A (en) * | 2017-08-24 | 2017-11-24 | 重庆三圣实业股份有限公司 | A kind of high flowability concrete and preparation method thereof and application method |
| CN107459308A (en) * | 2017-09-11 | 2017-12-12 | 中国人民解放军63926部队 | A kind of anti-isolation self-compacting concrete of upper flow regime |
| CN107601998A (en) * | 2017-10-27 | 2018-01-19 | 山东电力建设第工程公司 | A kind of voluntarily closely knit concrete formulation and forming method |
| CN107814540A (en) * | 2017-12-19 | 2018-03-20 | 济南大学 | A kind of fiber reinforced gunite concrete |
| CN107840624A (en) * | 2017-12-19 | 2018-03-27 | 济南大学 | A kind of flyash in great mixed amount gunite concrete |
| CN107963845A (en) * | 2017-12-29 | 2018-04-27 | 成都精准混凝土有限公司 | It is prepared by a kind of self-compacting concrete preparation process and dedicated modified additive |
| CN108314377A (en) * | 2018-01-25 | 2018-07-24 | 合肥中科富华新材料有限公司 | A kind of high performance cement concrete and the preparation method and application thereof |
| CN108383466A (en) * | 2018-05-14 | 2018-08-10 | 邢台建工商品混凝土有限公司 | Low-cost concrete |
| CN108529934A (en) * | 2017-03-06 | 2018-09-14 | 北京城建银龙混凝土有限公司 | A kind of self-compacting concrete and preparation method thereof |
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Application publication date: 20160727 |