CN104761212A - Low cementitious material self-compact concrete with rice husk ash as internal curing agent - Google Patents
Low cementitious material self-compact concrete with rice husk ash as internal curing agent Download PDFInfo
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- CN104761212A CN104761212A CN201510122255.XA CN201510122255A CN104761212A CN 104761212 A CN104761212 A CN 104761212A CN 201510122255 A CN201510122255 A CN 201510122255A CN 104761212 A CN104761212 A CN 104761212A
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Abstract
The invention relates to a low cementitious material self-compact concrete with rice husk ash as an internal curing agent. The low cementitious material self-compact concrete comprises Portland cement, rice husk ash, slag micro-powder, a modified polycarboxylate superplasticizer and a filler. The self-compact concrete has the characteristics of low consumption of Portland cement, good workability, stable later-stage strength development, low cost and substantial environment benefit. Compared with concretes in the prior art, the low cementitious material self-compact concrete has the advantages of self-compact concrete performance guaranteeing, reduction of the high burden and treatment cost of unused rice husk ash, slag micro-powder and other agricultural and industrial solid wastes to environment, and good application prospect.
Description
Technical field
The invention belongs to new material technology, environmental protection and energy saving technical field, be specifically related to a kind of low-cementitious material self-compacting concrete using rice hull ash as interior curing agent.
Background technology
Relative normal concrete, self-compacting concrete has higher requirement to raw material quality, and as maximum size of coarse aggregate is no more than 20 mm, particle form and grating require good, and this limits the spread of self-compacting concrete to a great extent.Because concrete production is normally gathered materials on the spot, many times strict raw material quality control standard is difficult to realize, often feasible technically but economically and impracticable.Therefore, good economy being had higher requirement to the progress of self-compacting concrete compounding process and challenging.The research of novel gelled material and admixture becomes the emphasis addressed this problem.
Lower intensity level concrete is in mix-design, and the selection aspect of gelling material, need adopt a certain amount of mineral admixture to substitute cement, thus increases the volume ratio under equal gelling material quality.And water reducer aspect, polycarboxylate water-reducer is as the main admixture of current preparation self-compacting concrete, though the diminishing of its excellence and function of slump protection have been widely accepted, particularly proper formulation diminishing requires high high-strength concrete, the concrete with greatly mobile.But for lower intensity level concrete, its gel material content is few and water consumption is bigger than normal, and a small amount of polycarboxylate water-reducer is difficult to make the most of the advantage, and more cannot suppress the generation of excreting water phenomenon, joined concrete quality is made to be difficult to ensure.And institute join lower intensity level concrete to water consumption and aggregate quality fluctuation very responsive.For meeting engineering demand, usually have to adopt the method improving gel material content to meet self-compacting ability requirement, thus provide the self-compacting concrete higher than design strength, this causes again production cost to increase.Therefore, how on the basis ensureing mechanical performance of concrete and weather resistance, make excellent property, the low-cementitious material self-compacting concrete of economic environmental protection becomes current main bugbear.
Summary of the invention
The object of the invention is the defect existed to overcome above-mentioned prior art, a kind of low-cementitious material self-compacting concrete using rice hull ash as interior curing agent and preparation method thereof is provided.Described self-compacting concrete is while guarantee product performance, on the one hand, the feature of rice hull ash self porous, high-ratio surface can be utilized, at the early stage bound fraction free-water of aquation, slow releasing in hydration process, thus serve as excellent property but economical and practical interior curing agent; On the other hand, compared with widely used traditional industry solid waste (such as flyash or slag), contain in rice hull ash after suitable calcining unformed siliceous (about 85 ~ 90%) of more high-content, almost close to the mediosilicic content of silicon ash, the calcium hydroxide reaction that easier and hydrated cementitious generates, secondary reaction occurs, and is excellent volcano grey matter additive.In addition, based on rice hull ash originally as vesicular structure, specific surface is comparatively large, and the polycarboxylate water-reducer that therefore the present invention is used is different from traditional polycarboxylate water-reducer, wherein containing par-tial polysaccharide base or polysaccharide-ether base viscosity modifier, can the concrete workability of Effective Regulation.Both effective couplings make joined low-cementitious material self-compacting concrete both have good workability, have again excellent mechanical property and weather resistance.
The low-cementitious material self-compacting concrete using rice hull ash as interior curing agent that the present invention proposes, be made up of silicate cement, rice hull ash, slag micropowder, modified polycarboxylic acid water reducer and packing material, the weight percent of each component is:
Weight percentages
Silicate cement 30% ~ 55%;
Rice hull ash 15% ~ 30%;
Slag micropowder 20% ~ 40%;
Modified polycarboxylic acid water reducer 0.8% ~ 2%;
All the other are packing material, conventional fine quartz sand class material, and its gross weight meets 100%;
Rice hull ash used is by rice husk grinding to 8 ~ 10 μm after 500 ~ 700 DEG C of high-temperature calcinations.
In the present invention, silicate cement is PO 42.5 grades or PO more than 42.5 grades strength grades.
In the present invention, modified polycarboxylic acid water reducer is the modified polycarboxylate water-reducer of polysaccharide-based or polysaccharide-ether base class viscosity modifier.
In the present invention, the low-cementitious material self-compacting concrete slump is greater than 270 mm, and 28 d ultimate compression strength are that 20 ~ 45 MPa, 28d drying shrinkage is less than 3 × 10
-4, 28d carbonation depth is less than 15 mm, and chloride permeability coefficient is lower than 1700 C.
The preparation method of the low-cementitious material self-compacting concrete using rice hull ash as interior curing agent that the present invention proposes, take various raw material by proportioning raw materials, mix, domination set gray scale is 5, water-cement ratio 0.38 ~ 0.4, namely obtains required self-compacting concrete product.
China produces at least 4 thousand ten thousand tons of rice husks per year, and a large amount of accumulations both took up space, and also can cause series of environmental problems, pays close attention to few so far.And compared with prior art, the present invention effectively combines the performance advantage of rice hull ash and viscosity modifier polycarboxylate water-reducer, fully ensure that the weather resistance such as concrete workability, strength development and resist drying contraction, there is stronger Modulatory character.In addition, fully utilize the various solid waste such as rice hull ash, slag micropowder, while guarantee self-compacting concrete product performance, these solid waste can be alleviated owing to not being utilized the serious burden and processing costs that cause environment, there is good economic and social benefit.
The performance requriements of this low-cementitious material self-compacting concrete is as shown in table 1:
The performance of table 1 low-cementitious material self-compacting concrete
| Project | Performance |
| The slump, mm | ≥ 270 |
| Final setting time, h | ≤ 9 |
| 3 d ultimate compression strength, MPa | ≥ 8 |
| 28 d ultimate compression strength, MPa | ≥ 20 |
| 28 d drying shrinkages | ≤ 3×10 -4 |
| Carbonation depth, mm | ≤ 15 |
| Displacement flux, C | ≤1700 |
In sum, this low-cementitious material self-compacting concrete process for preparation is simple, and each performance index are excellent, quality is easy to control, applied widely, are convenient to large-scale promotion application.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
embodiment 1
The starting material of low-cementitious material self-compacting concrete have silicate cement 45%, rice hull ash 30%, slag micropowder 20%, modified polycarboxylic acid water reducer 0.8%, packing material 4.2%.Aggregate-cement ratio is 5, and water-cement ratio is 0.38.Join the workability of self-compacting concrete and 20 DEG C at normal curing as shown in table 2 to the performance during regulation length of time.
The performance test results of table 2 low-cementitious material self-compacting concrete formula one
| Project | Performance |
| The slump, mm | 290 |
| Final setting time, h | 7.2 |
| 3 d ultimate compression strength, MPa | 12 |
| 28 d ultimate compression strength, MPa | 44.5 |
| 28 d drying shrinkages, % | 2.8×10 -4 |
| Carbonation depth, mm | 14.2 |
| Displacement flux, C | 1600 |
embodiment 2
The starting material of low-cementitious material self-compacting concrete have silicate cement 40%, rice hull ash 20%, slag micropowder 35%, modified polycarboxylic acid water reducer 1.2%, packing material 3.8%.Aggregate-cement ratio is 5, and water-cement ratio is 0.4.Join the workability of self-compacting concrete and 20 DEG C at normal curing as shown in table 3 to the performance during regulation length of time.
The performance test results of table 3 low-cementitious material self-compacting concrete formula two
| Project | Performance |
| The slump, mm | 280 |
| Final setting time, h | 8 |
| 3 d ultimate compression strength, MPa | 10.4 |
| 28 d ultimate compression strength, MPa | 36 |
| 28 d drying shrinkages, % | 2.2×10 -4 |
| Carbonation depth, mm | 12 |
| Displacement flux, C | 1380 |
embodiment 3
The main raw material(s) of low-cementitious material self-compacting concrete has silicate cement 30%, rice hull ash 20%, slag micropowder 40%, modified polycarboxylic acid water reducer 1.5%, packing material 8.5%.Aggregate-cement ratio is 5, and water-cement ratio is 0.4.Join the workability of self-compacting concrete and 20 DEG C at normal curing as shown in table 4 to the performance during regulation length of time.
The performance test results of table 4 low-cementitious material self-compacting concrete formula three
| Project | Performance |
| The slump, mm | 273 |
| Final setting time, h | 8.8 |
| 3 d ultimate compression strength, MPa | 8.2 |
| 28 d ultimate compression strength, MPa | 26.7 |
| 28 d drying shrinkages, % | 2×10 -4 |
| Carbonation depth, mm | 10.4 |
| Displacement flux, C | 1400 |
From above embodiment further, a kind of method preparing low-cementitious material self-compacting concrete using rice hull ash as interior curing agent involved by the present invention, join self-compacting concrete property indices all meet or exceed relevant criterion and Practical Project requirement, economical and practical, can extensively promote the use of.
Claims (4)
1., using rice hull ash as a low-cementitious material self-compacting concrete for interior curing agent, it is characterized in that being made up of silicate cement, rice hull ash, slag micropowder, modified polycarboxylic acid water reducer and packing material, the weight percent of each component is:
Weight percentages
Silicate cement 30% ~ 55%;
Rice hull ash 15% ~ 30%;
Slag micropowder 20% ~ 40%;
Modified polycarboxylic acid water reducer 0.8% ~ 2%;
All the other are packing material, and its gross weight meets 100%;
Rice hull ash used is by rice husk grinding to 8 ~ 10 μm after 500 ~ 700 DEG C of high-temperature calcinations.
2. the low-cementitious material self-compacting concrete prepared using rice hull ash as interior curing agent according to claim 1, is characterized in that, the strength grade of described silicate cement is PO 42.5 grades or PO more than 42.5 grades.
3. the low-cementitious material self-compacting concrete prepared using rice hull ash as interior curing agent according to claim 1, is characterized in that, modified polycarboxylic acid water reducer adopts containing the high-performance polycarboxylic acids water reducing agent with polysaccharide-based or polysaccharide-ether base viscosity modifier.
4. the low-cementitious material self-compacting concrete prepared using rice hull ash as interior curing agent according to claim 1, is characterized in that, the slump is greater than 270 mm, and 28 d ultimate compression strength are about 20 ~ 45 MPa, and 28 d drying shrinkages are less than 3 × 10
-4, 28d carbonation depth is less than 15 mm, and chloride permeability coefficient is lower than 1700 C.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152611A (en) * | 2015-10-16 | 2015-12-16 | 江苏名和集团有限公司 | Concrete internal maintenance material and preparation method thereof |
| CN105314938A (en) * | 2015-11-24 | 2016-02-10 | 绍兴文理学院 | Low-air-shrinkage anti-crack concrete |
| CN106396555A (en) * | 2016-09-08 | 2017-02-15 | 东南大学 | Cellulose fiber internal curing-based ultra-high-performance cement-based composite material and preparation method thereof |
| CN106892604A (en) * | 2017-03-23 | 2017-06-27 | 中国矿业大学 | A kind of method for making interior sealing compound concrete batching with waste incineration slag |
| CN107573099A (en) * | 2017-08-14 | 2018-01-12 | 成都新柯力化工科技有限公司 | A kind of building concrete penetrant crystalline sealing compound and application process |
| CN107686298A (en) * | 2017-07-13 | 2018-02-13 | 江苏美城建筑规划设计院有限公司 | A kind of self-compaction composite concrete and preparation method thereof |
| CN108059408A (en) * | 2017-12-22 | 2018-05-22 | 中建八局第建设有限公司 | A kind of high intensity self-compacting concrete and preparation method thereof |
| CN110577376A (en) * | 2019-10-15 | 2019-12-17 | 四川功予名图文设计有限公司 | Concrete internal curing agent, preparation method thereof and concrete internal curing method |
| CN111018378A (en) * | 2020-01-15 | 2020-04-17 | 肖本立 | Method for preparing self-leveling self-compacting cement by blending industrial and construction waste |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643060A (en) * | 2012-05-02 | 2012-08-22 | 同济大学 | High-strength concrete mixed with low-temperature rice husk ash |
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2015
- 2015-03-19 CN CN201510122255.XA patent/CN104761212A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102643060A (en) * | 2012-05-02 | 2012-08-22 | 同济大学 | High-strength concrete mixed with low-temperature rice husk ash |
Non-Patent Citations (1)
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| 武增礼等: "粘度改性剂对掺聚羧酸减水剂的水泥浆体流变学性能的影响", 《第七届全国混凝土耐久性学术交流会论文集》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152611A (en) * | 2015-10-16 | 2015-12-16 | 江苏名和集团有限公司 | Concrete internal maintenance material and preparation method thereof |
| CN105314938A (en) * | 2015-11-24 | 2016-02-10 | 绍兴文理学院 | Low-air-shrinkage anti-crack concrete |
| CN106396555A (en) * | 2016-09-08 | 2017-02-15 | 东南大学 | Cellulose fiber internal curing-based ultra-high-performance cement-based composite material and preparation method thereof |
| CN106396555B (en) * | 2016-09-08 | 2019-03-19 | 东南大学 | It is a kind of based on the ultra high performance cementitious and preparation method thereof conserved in cellulose fibre |
| CN106892604A (en) * | 2017-03-23 | 2017-06-27 | 中国矿业大学 | A kind of method for making interior sealing compound concrete batching with waste incineration slag |
| CN107686298A (en) * | 2017-07-13 | 2018-02-13 | 江苏美城建筑规划设计院有限公司 | A kind of self-compaction composite concrete and preparation method thereof |
| CN107686298B (en) * | 2017-07-13 | 2019-06-25 | 江苏美城建筑规划设计院有限公司 | A kind of self-compaction composite concrete and preparation method thereof |
| CN107573099A (en) * | 2017-08-14 | 2018-01-12 | 成都新柯力化工科技有限公司 | A kind of building concrete penetrant crystalline sealing compound and application process |
| CN108059408A (en) * | 2017-12-22 | 2018-05-22 | 中建八局第建设有限公司 | A kind of high intensity self-compacting concrete and preparation method thereof |
| CN110577376A (en) * | 2019-10-15 | 2019-12-17 | 四川功予名图文设计有限公司 | Concrete internal curing agent, preparation method thereof and concrete internal curing method |
| CN111018378A (en) * | 2020-01-15 | 2020-04-17 | 肖本立 | Method for preparing self-leveling self-compacting cement by blending industrial and construction waste |
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