CN105801053A - Large-admixing-amount-fly-ash C40 self-compacting concrete - Google Patents
Large-admixing-amount-fly-ash C40 self-compacting concrete 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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- 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
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Abstract
The invention discloses large-admixing-amount-fly-ash C40 self-compacting concrete.The concrete comprises cementitious materials, aggregates, an admixture and water, the cementitious materials comprise cement and blending materials, the blending materials comprise fly ash and mineral powder, the aggregates include the coarse aggregates and the fine aggregates, and the admixture is a self-compacting special polycarboxylic-type water reducing agent.Per cubic meter of the concrete comprises 200 kg-280 kg of cement, 0 kg- 90 kg of mineral powder, 125 kg-200 kg of fly ash, 700 kg-1,000 kg of sand, 800 kg-950 kg of stone, 0.3 kg-10 kg of water reducing agent and 110 kg-170 kg of water.According to the large-admixing-amount-fly-ash C40 self-compacting concrete, as the fly ash and the mineral powder are combined and mixed, and the large amount of fly ash is admixed, the content of the cement is decreased, the production cost of the concrete is reduced, hydration heat of the cement can be further reduced, the workability of the concrete is improved, and the durability of the concrete is improved.
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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Cited By (24)
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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 |
| CN108821689A (en) * | 2018-07-17 | 2018-11-16 | 芜湖芬特勘测服务有限公司 | A kind of modified concrete and preparation method thereof |
| CN109437700A (en) * | 2018-12-20 | 2019-03-08 | 中南大学 | One kind is unpowered transport self-compacting concrete and its application |
| CN109456007A (en) * | 2018-12-26 | 2019-03-12 | 陕西天石实业有限责任公司 | It lays a railway track C40 self-compacting concrete and preparation method thereof |
| CN109776051A (en) * | 2019-02-28 | 2019-05-21 | 中国建筑第八工程局有限公司 | Low-cost high-strength concrete |
| CN111333383A (en) * | 2020-02-18 | 2020-06-26 | 中建西部建设湖南有限公司 | Extra-coarse machine-made sand super-high layer pumping high-strength concrete |
| CN111348873A (en) * | 2020-02-18 | 2020-06-30 | 中建西部建设湖南有限公司 | Extra-coarse machine-made sand pumping concrete |
| CN111517713A (en) * | 2020-03-23 | 2020-08-11 | 中清大装配式建筑有限公司 | Low-cost high-strength C45 fine-stone concrete and preparation method thereof |
| CN111620609A (en) * | 2020-06-24 | 2020-09-04 | 广西南宁嘉泰水泥制品有限公司 | Ultra-low electric flux concrete and preparation method thereof |
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| CN111348873A (en) * | 2020-02-18 | 2020-06-30 | 中建西部建设湖南有限公司 | Extra-coarse machine-made sand pumping concrete |
| CN111517713A (en) * | 2020-03-23 | 2020-08-11 | 中清大装配式建筑有限公司 | Low-cost high-strength C45 fine-stone concrete and preparation method thereof |
| CN111620609A (en) * | 2020-06-24 | 2020-09-04 | 广西南宁嘉泰水泥制品有限公司 | Ultra-low electric flux concrete and preparation method thereof |
| CN112010626A (en) * | 2020-09-14 | 2020-12-01 | 陈斌 | Self-compacting freeze-thaw-resistant concrete and preparation method thereof |
| CN112521100A (en) * | 2020-12-17 | 2021-03-19 | 十九冶成都建设有限公司 | Ultra-thick wall concrete and preparation method and construction method thereof |
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| CN114656224A (en) * | 2022-04-27 | 2022-06-24 | 水利部交通运输部国家能源局南京水利科学研究院 | Low-cementing-material self-compacting concrete and preparation method thereof |
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