CN104891884A - C35 low-gel-material self-compacting concrete and preparation method thereof - Google Patents
C35 low-gel-material self-compacting concrete and preparation method thereof Download PDFInfo
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- CN104891884A CN104891884A CN201510259383.9A CN201510259383A CN104891884A CN 104891884 A CN104891884 A CN 104891884A CN 201510259383 A CN201510259383 A CN 201510259383A CN 104891884 A CN104891884 A CN 104891884A
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Abstract
The invention relates to concrete, and specifically relates to C35 low-gel-material self-compacting concrete and a preparation method of the concrete. The scheme of the invention is that the C35 low-gel-material self-compacting concrete comprises the following raw materials, by mass: 180-300 kg/m3 of cement, 30-80 kg/m3 of coal ash, 220-640 kg/m3 of fine river sand, 300-600 kg/m3 of machine-made sand, 600-1100 kg/m3 of cobblestone with a diameter of 5-25 mm, 5-20 kg/m3 of a polycarboxylic acid water reducer, 0.01-0.05 kg/m3 of a thickening agent, and 4-8 kg/m3 of an early strength agent. The C35 low-gel-material self-compacting concrete provided in the invention is less in use amount of materials, has better fluidity and early strength, and plays an important part in accelerating popularization of application of C35 self-compacting concrete.
Description
Technical field
The present invention relates to concrete, be specifically related to a kind of C35 low glue material self-compacting concrete and preparation method thereof.
Background technology
Self-compacting concrete (Self Compacting Concrete or Self-Consolidating Concrete is called for short SCC) refers under self gravitation effect, can flow, closely knit, also can filling template completely even if there is fine and close reinforcing bar, obtain fine uniformity simultaneously, and do not need the concrete of extraneous vibration.Self-compacting concrete gel material content of the prior art is generally at 500kg/m
3above, cement consumption is generally at 350kg/m
3above, and employ the mineral admixture (breeze, flyash) with hydration activity in a large number.Utilize the concrete prepared by this technology, its strength grade is often at more than C50; The people such as Nie Fazhi (patent CN102060481A) have studied a kind of strength grade C50 rank, and gel material content drops to 430kg/m
3to 500kg/m
3.But gel material content is now still significantly more than normal concrete, and strength grade is still higher.And in practical engineering application, consumption is maximum, be the most but the concrete of C35 rank; But the industry cannot obtain the self-compacting concrete of the C35 rank that gelling material is less and mobility is higher, and this seriously constrains the application of self-compacting concrete always.And, in existing self-compacting concrete, the endurance issues such as the gelling material such as large dosage cement, breeze easily cause hydration heat too high, and volume stability is poor.
So, reduce the gel material content of self-compacting concrete, be not only conducive to the application of self-compacting concrete, and can economize on resources, reduce production cost, improve productivity effect.And gel material content is the Main Means improving concrete flowability, how reduces gel material content and don't reduce its mobility; Improve early strength and make it have that preferably to protect performance of collapsing be a problem being difficult to overcome always.
Summary of the invention
The object of the invention is the above-mentioned shortcoming in order to solve prior art, proposing a kind of C35 low glue material self-compacting concrete and preparation method thereof.C35 provided by the invention low glue material self-compacting concrete gel material content is few, and possesses good mobility and early strength, plays important promoter action to the application promoting C35 self-compacting concrete.
The solution of the present invention is, a kind of C35 low glue material self-compacting concrete, and its raw material packet is containing the component of following mass content: cement 180 ~ 300kg/m
3, flyash 30 ~ 80kg/m
3, thin river sand 220 ~ 640kg/m
3, Machine-made Sand 300 ~ 600kg/m
3, 5 ~ 25mm stone, 600 ~ 1100kg/m
3, polycarboxylate water-reducer 5 ~ 20kg/m
3, thickening material 0.01 ~ 0.05kg/m
3, hardening accelerator 4 ~ 8kg/m
3.
Described cement refers to general-purpose cement, can select ordinary Portland cement, Portland blast furnace slag cement, Portland pozzolana cement, Portland fly ash cement or composite Portland cement.Wherein, the preferred fineness modulus of the thin river sand river sand that is less than 2.0; Machine-made Sand is preferably I, II, III interval medium coarse sand; 5 ~ 25mm stone is machine-processed rubble; Flyash is I or II grade of flyash; Thickening material can with concrete, mortar thickening material conventional on the market, preferred Vltra tears; Hardening accelerator preferably sulfuric acid sodium and Quilonum Retard.
On such scheme basis, the preferable amount of described cement is 180 ~ 198kg/m
3.
The consumption of flyash of the present invention is preferably 30 ~ 55kg/m
3.
Another preferred version, described thin river sand consumption is 350 ~ 460kg/m
3, Machine-made Sand consumption 460 ~ 510kg/m
3, 5 ~ 25mm stone, 800 ~ 950kg/m
3.
Another preferred version, described polycarboxylate water-reducer consumption is 12 ~ 14kg/m
3.
Another preferred version, described thickening material consumption 0.02 ~ 0.04kg/m
3.
Another preferred version, described hardening accelerator consumption 5 ~ 6kg/m
3.
The present invention also provides the preparation method of described C35 low glue material self-compacting concrete, comprises the following steps:
(1) raw material is taken by proportioning: cement 180 ~ 300kg/m
3, flyash 30 ~ 80kg/m
3, thin river sand 220 ~ 640kg/m
3, Machine-made Sand 300 ~ 600kg/m
3, 5 ~ 25mm stone, 600 ~ 1100kg/m
3, hardening accelerator 4 ~ 8kg/m
3, and put into stirrer and be dry mixed 20 ~ 60s;
(2) polycarboxylate water-reducer 5 ~ 20kg/m is taken by proportioning
3, thickening material 0.01 ~ 0.05kg/m
3, and thickening material is joined in water reducer, stir;
(3) admixture of step (2) and water are joined in the compound of step (1), water consumption controls at 145 ~ 180kg/m simultaneously
3, stir 1min ~ 2min, to obtain final product.
As improvement project, before being dry mixed, also as follows pre-treatment is soaked to stirrer inwall: take cement 180 ~ 300kg/m in proportion
3, flyash 30 ~ 80kg/m
3, thin river sand 220 ~ 640kg/m
3, Machine-made Sand 300 ~ 600kg/m
3, 5 ~ 25mm stone, 600 ~ 1100kg/m
3, hardening accelerator 4 ~ 8kg/m
3, water 145 ~ 180kg/m
3, pre-mixing concrete, makes stirrer inwall be soaked by one deck cement slurry.
Another preferred version, step (1) compound is when stirrer is dry mixed, and the time of being dry mixed is 30s.
The coarse-fine aggregate grating that the present invention is good, can effectively improve concrete accumulation, makes the phenomenons such as concrete is not easily emanated under larger mobility state, layering; Find that thickening material of the present invention under comparatively low-cementitious material consumption, can increase concrete mobility, improve the parcel of concrete coarse aggregate after deliberation; Hardening accelerator of the present invention is coordinated not change fresh concrete serviceability and while protecting performance of collapsing, to increase concrete early strength.Make self-compacting concrete strength grade reach C35 rank on the whole, the normal concrete of Replacing same levels widely, reduces 50 ~ 150kg/m simultaneously
3gelling material, saved resource, reduced production cost.Solve concrete in self-compacting application, be difficult to reach C35 rank and the large problem of gel material content.In addition, early strength of the present invention is higher, and within one day, ultimate compression strength reaches more than 15MPa, can realize form removal in a day, reduces mould usage quantity, enhances productivity.
Embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated, and protection scope of the present invention is not limited in these embodiments.
Embodiment 1-5
The raw material that following examples adopt is as follows:
Cement is PO
42.5, second class powered coal ash, fineness modulus is the thin river sand of 1.9, and fineness modulus is the Machine-made Sand of 3.3, and 2 ~ 25mm rubble of continuous grading; Water reducer is high-efficiency water-reducing agent of poly-carboxylic acid; Thickening material used is Vltra tears; Hardening accelerator used is anhydrous sodium sulphate.
Testing laboratory is on above starting material basis, and design strength grade is C35 mix parameters of high-strength self-compacting concrete, and its gel material content is not more than 350kg/m
3, specifically see the following form.
(1) the concrete proportioning kg/m of table 1 embodiment 1-5
3
(2) For Workability of Self-compacting Concrete test is newly mixed
According to " self-compacting concrete utilisation technology code ", test slump flow test, T during fresh concrete 0min and 60min respectively
50, U-shaped and V-type.Result shows, and the equal conformance with standard requirement of fresh concrete serviceability of all proportionings, refers to table 2.
Table 2 fresh concrete serviceability
(3) self-compacting concrete strength trial
According to relevant national standard, the ultimate compression strength of test concrete respectively 1 day, 3 days, 7 days and 28 days, refers to table 3.
Table 3 concrete ultimate compression strength result MPa in each length of time
| Numbering | 1 day | 3 days | 7 days | 28 days |
| Embodiment 1 | 15.9 | 17.4 | 20.6 | 35.8 |
| Embodiment 2 | 15.4 | 17.8 | 21.3 | 36.4 |
| Embodiment 3 | 16.5 | 17.0 | 22.4 | 37.6 |
| Embodiment 4 | 17.8 | 20.4 | 25.6 | 39.8 |
| Embodiment 5 | 17.0 | 19.6 | 24.8 | 38.5 |
Can find out, gained self-compacting concrete strength grade of the present invention, at C35, can replace the normal concrete of widely used same levels, utilize the performances such as the high workability of self-compacting concrete, without vibration, significantly can improve the Working environment of workman in construction, increase work efficiency; Early strength is higher, and within one day, ultimate compression strength is at more than 10MPa, can form removal in day lifting.
Embodiment 6-10
(1) the concrete proportioning kg/m of table 4 embodiment 6-10
3
(2) For Workability of Self-compacting Concrete test is newly mixed
According to " self-compacting concrete utilisation technology code ", test slump flow test, T during fresh concrete 0min and 60min respectively
50, U-shaped and V-type.Result shows, and the equal conformance with standard requirement of fresh concrete serviceability of all proportionings, refers to table 5.
Table 5 fresh concrete serviceability
(3) self-compacting concrete strength trial
According to relevant national standard, the ultimate compression strength of test concrete respectively 1 day, 3 days, 7 days and 28 days, refers to table 6
Table 6 concrete ultimate compression strength result MPa in each length of time
| Numbering | 1 day | 3 days | 7 days | 28 days |
| Embodiment 6 | 12.1 | 17.4 | 20.8 | 35.9 |
| Embodiment 7 | 15.1 | 17.8 | 21.2 | 36.7 |
| Embodiment 8 | 15.2 | 17.0 | 21.0 | 37.8 |
| Embodiment 9 | 14.4 | 18.4 | 22.1 | 37.4 |
| Embodiment 10 | 15.8 | 18.2 | 22.1 | 38.5 |
Can find out, gained self-compacting concrete strength grade of the present invention, at C35, can replace the normal concrete of widely used same levels, utilize the performances such as the high workability of self-compacting concrete, without vibration, significantly can improve the Working environment of workman in construction, increase work efficiency; Early strength is higher, and within one day, ultimate compression strength is at more than 10MPa, can form removal in day lifting.
The preparation method that above-described embodiment adopts:
First pre-treatment: take cement, flyash, thin river sand, Machine-made Sand, 5 ~ 25mm stone, hardening accelerator in proportion, water, pre-mixing concrete, makes stirrer inwall be soaked by one deck cement slurry.
Then take raw material by proportioning: cement, flyash, thin river sand, Machine-made Sand, 5 ~ 25mm stone, hardening accelerator, and put into stirrer and be dry mixed 30s;
Take polycarboxylate water-reducer, thickening material by proportioning again, and thickening material is joined in water reducer, stir; Then above-mentioned admixture and water are added in the compound be dry mixed, water consumption controls at 145 ~ 180kg/m simultaneously
3, stir 1min ~ 2min, to obtain final product.
Wherein, thickening material in each embodiment adopts hydroxypropyl first class Mierocrystalline cellulose, the hardening accelerator of embodiment 1,2,6,7,9 be sodium sulfate, embodiment 3,4,5,8,10 hardening accelerator be Quilonum Retard.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from spirit of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. a C35 low glue material self-compacting concrete, is characterized in that, its raw material packet is containing the component of following mass content: cement 180 ~ 300kg/m
3, flyash 30 ~ 80kg/m
3, thin river sand 220 ~ 640kg/m
3, Machine-made Sand 300 ~ 600kg/m
3, 5 ~ 25mm stone, 600 ~ 1100kg/m
3, polycarboxylate water-reducer 5 ~ 20kg/m
3, thickening material 0.01 ~ 0.05kg/m
3, hardening accelerator 4 ~ 8kg/m
3.
2. C35 according to claim 1 low glue material self-compacting concrete, is characterized in that, the consumption of described cement is 180 ~ 198kg/m
3.
3. C35 according to claim 1 low glue material self-compacting concrete, is characterized in that, the consumption of described flyash is 30 ~ 55kg/m
3.
4. the C35 low glue material self-compacting concrete according to claim 1,2 or 3, is characterized in that, described thin river sand consumption is 350 ~ 460kg/m
3, Machine-made Sand consumption 460 ~ 510kg/m
3, 5 ~ 25mm stone consumption, 800 ~ 950kg/m
3.
5. the C35 low glue material self-compacting concrete according to claim 1,2 or 3, it is characterized in that, described polycarboxylate water-reducer consumption is 12 ~ 14kg/m
3.
6. the C35 low glue material self-compacting concrete according to claim 1,2 or 3, is characterized in that, described thickening material consumption 0.02 ~ 0.04kg/m
3.
7. the C35 low glue material self-compacting concrete according to claim 1,2 or 3, is characterized in that, described hardening accelerator consumption 5 ~ 6kg/m
3.
8. the preparation method of C35 low glue material self-compacting concrete described in claim 1 to 7 any one claim, is characterized in that, comprise the following steps:
(1) raw material is taken by proportioning: cement 180 ~ 300kg/m
3, flyash 30 ~ 80kg/m
3, thin river sand 220 ~ 640kg/m
3, Machine-made Sand 300 ~ 600kg/m
3, 5 ~ 25mm stone, 600 ~ 1100kg/m
3, hardening accelerator 4 ~ 8kg/m
3, and put into stirrer and be dry mixed 20 ~ 60s;
(2) polycarboxylate water-reducer 5 ~ 20kg/m is taken by proportioning
3, thickening material 0.01 ~ 0.05kg/m
3, and thickening material is joined in polycarboxylate water-reducer, stir;
(3) admixture of step (2) and water are joined in the compound that step (1) obtains, water consumption controls at 145 ~ 180kg/m simultaneously
3, stir 1min ~ 2min, to obtain final product.
9. the preparation method of C35 low glue material self-compacting concrete according to claim 8, is characterized in that, before being dry mixed, also soak pre-treatment as follows to stirrer inwall: take cement 180 ~ 300kg/m in proportion
3, flyash 30 ~ 80kg/m
3, thin river sand 220 ~ 640kg/m
3, Machine-made Sand 300 ~ 600kg/m
3, 5 ~ 25mm stone, 600 ~ 1100kg/m
3, hardening accelerator 4 ~ 8kg/m
3, water 145 ~ 180kg/m
3, pre-mixing concrete, makes stirrer inwall be soaked by one deck cement slurry.
10. the preparation method of C35 low glue material self-compacting concrete according to claim 8 or claim 9, it is characterized in that, step (1) compound is when stirrer is dry mixed, and the time of being dry mixed is 30s.
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| CN105481320A (en) * | 2015-12-29 | 2016-04-13 | 青岛磊鑫混凝土有限公司 | Lean cemented concrete prepared from aggregate chip iron tailings sand and polycarboxylate water reducer |
| CN105884254A (en) * | 2016-03-17 | 2016-08-24 | 孔蕾蕾 | Preparing method for high-strength phenolic resin concrete |
| CN106587788A (en) * | 2017-01-03 | 2017-04-26 | 长沙加美乐素化工有限公司 | Low-cement-content self-compacting concrete and preparation method thereof |
| CN107840591A (en) * | 2017-12-01 | 2018-03-27 | 北京怡居建筑科技有限公司 | A kind of novel cement concrete and its application in construction wall |
| CN108249806A (en) * | 2017-12-13 | 2018-07-06 | 镇江建科建设科技有限公司 | A kind of preparation method of hydrated calcium silicate early strength agent and a kind of self-compacting concrete |
| CN108249845A (en) * | 2017-12-13 | 2018-07-06 | 镇江建科建设科技有限公司 | A kind of Organic-inorganic composite early strength agent and the self-compacting concrete prepared using the early strength agent |
| CN109972524A (en) * | 2019-04-18 | 2019-07-05 | 联建建设工程有限公司 | Inverted Y-shaped upper king-post strut closes up section constructing method |
| CN114195465A (en) * | 2021-12-24 | 2022-03-18 | 上海建工建材科技集团股份有限公司 | Steam-curing-free concrete for C40 prefabricated part and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105481320A (en) * | 2015-12-29 | 2016-04-13 | 青岛磊鑫混凝土有限公司 | Lean cemented concrete prepared from aggregate chip iron tailings sand and polycarboxylate water reducer |
| CN105884254A (en) * | 2016-03-17 | 2016-08-24 | 孔蕾蕾 | Preparing method for high-strength phenolic resin concrete |
| CN106587788A (en) * | 2017-01-03 | 2017-04-26 | 长沙加美乐素化工有限公司 | Low-cement-content self-compacting concrete and preparation method thereof |
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| CN108249845A (en) * | 2017-12-13 | 2018-07-06 | 镇江建科建设科技有限公司 | A kind of Organic-inorganic composite early strength agent and the self-compacting concrete prepared using the early strength agent |
| CN109972524A (en) * | 2019-04-18 | 2019-07-05 | 联建建设工程有限公司 | Inverted Y-shaped upper king-post strut closes up section constructing method |
| CN114195465A (en) * | 2021-12-24 | 2022-03-18 | 上海建工建材科技集团股份有限公司 | Steam-curing-free concrete for C40 prefabricated part and preparation method thereof |
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