CN103979886A - High early-strength high-performance concrete mixed with nano silicon dioxide powder and preparation method thereof - Google Patents
High early-strength high-performance concrete mixed with nano silicon dioxide powder and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high early-strength high-performance concrete mixed with nano silicon dioxide powders and a preparation method thereof. The concrete comprises following components, 519-550 kg/m<3> of cement, 1010-1040 kg/m<3> of a crude aggregate, 600-620 kg/m<3> of a fine aggregate, 225-235 kg/m<3> of water, 7.77-9.1 kg/m<3> of a high-performance water reducer and 8.1-16.2 kg/m<3> of nano silicon dioxide. A mixing ratio of the concrete is 37-38% in sand percentage and 0.40-0.43 in water-cement ratio. The fine aggregate is river sand or medium sand and the particle size of the crude aggregate is 5-35 mm. Water reducing rate of the high-performance water reducer is not less than 25%. The average particle size of the nano silicon dioxide is 30+/-5 nm. The preparation method can improve early strength of the concrete and the concrete can be used for winter construction of a super-high-rise building and a concrete project which has an early-period requirement of a normal temperature condition and a low temperature condition. The concrete is high in practical value.
Description
Technical field
The invention belongs to civil engineering work concrete technology field, relate to early strong High-Performance Concrete Mixing, specially refer to and improve the early stage performance of concrete taking nano silicon as additive.
Background technology
Occur after portland cement from the twenties in 19th century, because the concrete being mixed with it has the needed intensity of engineering and weather resistance, and raw material is easy to get, cost is lower, particularly energy consumption is lower, thereby purposes is very extensive, become the important structure material of the modern project structures such as civil engineering work, hydro project, communications and transportation.
20 beginnings of the century, along with the proposition of the theories such as water cement ratio, tentatively establish the theoretical basis of concrete strength.After, in succession there is light aggregate concrete, gas concrete and other concrete, various concrete admixtures are also brought into use.Since the sixties in last century, widespread use water reducer, and there is high efficiency water reducing agent and corresponding chutable concrete; Macromolecular material enters concrete material field, has occurred polymer concrete; Multiple fiber is used to the fibrous concrete of dispersed reinforcement.
Concrete early strength agent is one of admixture kind using the earliest in admixture developing history.Up to the present, people are the multiple early-strength type admixture of exploitation except villaumite and vitriol successively, as nitrite, chromic salt etc., and organism hardening accelerator, as trolamine, calcium formiate, urea etc., and on the basis of hardening accelerator, the multiple composite additive of production application, as early strength water-reducing agent, early strength antifreezing agent and early-strength type pumping agent etc.The early-strength type admixture of these kinds all uses in Practical Project, is improving concrete performance.Improve operating efficiency and save cost of investment aspect and brought into play vital role.
Nano material refers in three-dimensional space, to have at least one dimension to be of a size of 1nm～100nm, due to its small size, present the features such as small-size effect, quantum size effect, surface-interface effect and macro quanta tunnel effect that macro object do not have, be described as " the most promising material of 21 century " by scientists.The appearance of nanotechnology indicates that the ability of mankind's nature remodeling has extended to atom, molecular level, indicates that human sciences's technology has entered new epoch-nanosecond science and technology epoch.Nanometer SiO
2be a kind of amorphous substance, its particle diameter is only about 20nm, be widely used in modified paint, anti ultraviolet agent, plastics additive, rubber item, pigment, pottery, etc. field.
First nanoscale science and technology academic conference, formally a new branch using nanometer material science as Materials science makes public, and from then on, nano material has caused the very big interest of countries in the world material circle and physics circle and has extensively paid attention to.At present, about the existing more achievement in research of concrete high-efficiency activated mineral spike, and be applied in engineering reality.In active mineral spike, contain a large amount of active silicas and activated alumina, in hydrated cementitious, generate the low alkalinity hydrated calcium silicate that intensity is high, stability is strong, improved aquation gum material.Fine mineral spike can be filled between cement granules, makes Behavior of Hardened Cement Paste densification, and can improve interface structure and performance.
The nano level SiO of synthetic
2(Nano-SiO
2, be called for short NS) particle diameter very little, its pozzolanic activity is higher much than silicon ash, flyash etc.In cement slurry, Ca (OH)
2can be more at nanometer SiO
2surface forms bonding, and generates C-S-H gel, has played reduction Ca (OH)
2content and refinement Ca (OH)
2the effect of crystalline size, CSH gel is with nanometer SiO simultaneously
2for core forms bunch shape structure, nanometer SiO
2play the effect of CSH gel network node.Nanometer SiO
2above-mentioned acting on can improve in theory the performances such as concrete intensity, degree of compactness, impermeability.At present for mixing nanometer SiO in concrete
2research fewer, only limit in the aspect such as interface modification, macroscopical physical and mechanical property.
Improving the important directions that cement concrete early strength is concrete material development, is also the study hotspot in concrete material field at present.Nano silica powder is applied in concrete material, will increases substantially the early stage performance of concrete, there is significant innovative significance and Important Project using value.
Summary of the invention
The invention provides one and mix early strong high performance concrete of nano silica powder and preparation method thereof, object is to improve concrete early strength.
In order to achieve the above object, the technical solution used in the present invention is as follows:
The early strong high performance concrete of nano silica powder of mixing of the present invention, is characterized in that component and content are as follows: cement 519--550kg/m
3, coarse aggregate 1010-1040kg/m
3, fine aggregate 600--620kg/m
3, water 225--235kg/m
3, high-performance water reducing agent 7.77--9.1kg/m
3, nano silicon 8.1--16.2kg/m
3, proportioning is sand coarse aggregate ratio 37～38%, water cement ratio 0.40～0.43.
Described cement is the silicate cement that strength grade is not less than PC32.5 level.
Described fine aggregate is river sand or medium sand, and silt content is less than 3%.
The particle diameter of described coarse aggregate is 5-35mm.
The water-reducing rate of described high-performance water reducing agent is not less than 25%.
Described high-performance water reducing agent is naphthalene series concrete high efficiency water reducing agent or polycarboxylate high-efficiency water reducing agent.
Described nano silicon median size 30 ± 5nm, nano surface processing, nanometer titanium dioxide silicone content
>=99.5%, calcination loss rate≤6.0%.
Preparation method, comprises the steps:
1) water of high-performance water reducing agent, nano silicon, 60-70%, is stirred into mixed solution;
2) in concrete mixer, coarse aggregate, fine aggregate and cement mixing are evenly become to solid mixt;
3) by step 1) mixed solution, step 2) water of solid mixt, residue 30-40%, high-speed stirring 180-240 second, be stirred into concrete mix.
Described mixing speed is agitator shaft speed 30r/min.
Fine aggregate: river sand, the silt contents such as medium sand are less than 3%.
Coarse aggregate: particle diameter is 5-35mm, fineness modulus 4.3, aerated density 1460kg/m
3, apparent density 2.85g/cm
3, crush values 3.45%, meets GB/T14684-2001 " cobble for building, rubble " requirement.
High-performance water reducing agent: water-reducing rate is not less than 25%; There are naphthalene series concrete high efficiency water reducing agent and polycarboxylate high-efficiency water reducing agent.
Nano silicon: median size 30 ± 5nm, specific surface area 200 ± 30mm
2/ g, content>=99.5%.
Mix proportion design considerations mass method calculates.Sand coarse aggregate ratio 37-38%, water-cement ratio 0.40-0.43.
Take starting material by above-mentioned mass ratio, mechanical stirring.Stirring technique is:
Water reducer plus nano powder adds 60-70% water consumption, is stirred into mixed solution; In concrete mixer, thick, fine aggregate are evenly become to solid mixt with cement mixing; Mixed solution adds solid mixt and adds residue 30-40% water consumption, high-speed stirring 180-240 second, is stirred into concrete mix.
Beneficial effect: add nano silicon in the present invention's formula and can improve concrete strength, especially significantly improve early age strength of concrete, improving concrete performance, improve operating efficiency and play a significant role with saving cost of investment aspect.Carry out grouping experiment according to " standard for test methods of mechanical properties of ordinary concrete GB/T50081-2002 ", different embodiment prove, that is prepared by present method mixes early strong high performance concrete of nano silica powder, contrast the normal concrete of same mix-design, the folding strength in the 7 day length of time can improve 214%--396%, tensile splitting strength can improve 28.9%--43.0%, and ultimate compression strength can improve 6.13%--17.2%; The tensile splitting strength in the 28 day length of time can improve 7.8%-22.2%.This early strength concrete can be used for the high-rise building of winter construction and normal temperature and cold condition the concrete works of early stage requirement, has great engineering practical value and significant Technological Economy meaning.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with technical scheme.
Embodiment 1
Certain harbour engineering self compacting high strength frost thawing resistance concrete, raw materials and performance are as follows:
Cement: PI42.5 silicate cement, purchased from Yu Hua cement mill, Nanjing.
Fine aggregate: river sand, fineness modulus 2.3, medium sand; Apparent density 2.57g/cm
3, before using, rinse and dry.
Coarse aggregate: high-density Wingdale, nominal particle diameter is 5-35mm, apparent density is 2.85g/cm
3.
Water: tap water.
Water reducer: poly carboxylic acid series water reducer, water-reducing rate 42%.Purchased from Nanjing Painier Technology Co., Ltd..
Nanometer SiO
2powder: nanometer SiO
2content is greater than 99.5%, particle diameter 30 ± 5nm.Purchased from Hangzhou Wanjing New Material Co., Ltd..
According to " design of common concrete proportioning code (JGJ55-2011) ", mix Design following (sand coarse aggregate ratio 37%, water cement ratio 0.4):
Take starting material by above-mentioned mass ratio, mechanical stirring, stirring technique:
Water reducer plus nano powder adds 60% water consumption, is stirred into mixed solution; Thick, fine aggregate are evenly become to solid mixt with cement mixing; Mixed solution adds solid mixt and adds residue 40% water consumption, and (agitator shaft speed 30r/min) stirs 240 seconds at a high speed.
According to " standard for test methods of mechanical properties of ordinary concrete GB/T50081-2002 ", strength trial result:
7 days ultimate compression strength 35.7MPa, 7 days folding strength 3.8Mpa, 7 days tensile splitting strength 1.69MPa.
Embodiment 2
Starting material:
Cement: conch board PC42.5 composite Portland cement
Fine aggregate: river sand, fineness modulus 2.3, medium sand; Apparent density 2.65g/cm
3, before using, rinse and dry.
Coarse aggregate: the basaltic broken stone of In Nanjing, nominal particle diameter is 5-35mm.
Water: Nanjing tap water.
Water reducer: the Richlam240 naphthalene series concrete high efficiency water reducing agent that Nanjing Painier Technology Co., Ltd. produces, water-reducing rate 25%.
Nanometer SiO
2powder: the nanometer SiO that Zhejiang Hangzhou ten thousand scape novel material company limiteds produce
2powder, nano-substance content is greater than 99.5%, median size 30nm, specific surface area 200mm
2/ g, calcination loss rate 3.5%.
This example arranges adds nanometer SiO
2the early strength concrete of powder and do not add nanometer SiO
2the normal concrete of powder, according to " design of common concrete proportioning code (JGJ55-2011) ", " Standard for test methods of properties of ordinary concrete mixture standard (GB/T50080-2002) ", " standard for test methods of mechanical properties of ordinary concrete (GB/T50081-2002) " carries out.
Mix-design is (water cement ratio 0.43, sand coarse aggregate ratio 38%):
Test-results:
Embodiment 3
Starting material:
Cement: conch board PC32.5 composite Portland cement
Fine aggregate: river sand, fineness modulus 2.3, medium sand; Apparent density 2.65g/cm
3, before using, rinse and dry.
Coarse aggregate: the basaltic broken stone of In Nanjing, nominal particle diameter is 5-35mm.
Water: Nanjing tap water.
Water reducer: the Richlam240 naphthalene series concrete high efficiency water reducing agent that Nanjing Painier Technology Co., Ltd. produces, water-reducing rate 25%
Nanometer SiO
2powder: the nanometer SiO that Zhejiang Hangzhou ten thousand scape novel material company limiteds produce
2powder, nano-substance content is greater than 99.5%, median size 30nm, specific surface area 200m
2/ g, calcination loss rate 3.5%.
This example arranges adds nanometer SiO
2the early strength concrete of powder and do not add nanometer SiO
2the normal concrete of powder, according to " design of common concrete proportioning code (JGJ55-2011) ", " Standard for test methods of properties of ordinary concrete mixture standard (GB/T50080-2002) ", " standard for test methods of mechanical properties of ordinary concrete (GB/T50081-2002) " carries out.
Mix-design is (water cement ratio 0.43, sand coarse aggregate ratio 38%):
| Type | Water cement ratio | Water | Cement | Fine aggregate | Coarse aggregate | Nanometer NS | Water reducer |
| Do not mix NS | 0.43 | 235 | 535 | 620 | 1010 | 0 | 8.01 |
| Mix NS | 0.43 | 235 | 519 | 620 | 1010 | 16.2 | 7.77 |
Test-results:
Embodiment 4
Starting material:
Cement: conch board PC32.5 composite Portland cement
Fine aggregate: river sand, fineness modulus 2.3, medium sand; Apparent density 2.65g/cm
3, before using, rinse and dry.
Coarse aggregate: the basaltic broken stone of In Nanjing, nominal particle diameter is 5-35mm.
Water: Nanjing tap water.
Water reducer: the Richlam240 naphthalene series concrete high efficiency water reducing agent that Nanjing Painier Technology Co., Ltd. produces, water-reducing rate 25%
Nanometer SiO
2powder: the nanometer SiO that Zhejiang Hangzhou ten thousand scape novel material company limiteds produce
2powder, nano-substance content is greater than 99.5%, median size 30nm, specific surface area 200m
2/ g, calcination loss rate 3.5%.
This example arranges adds nanometer SiO
2the early strength concrete of powder and do not add nanometer SiO
2the normal concrete of powder, according to " design of common concrete proportioning code (JGJ55-2011) ", " Standard for test methods of properties of ordinary concrete mixture standard (GB/T50080-2002) ", " standard for test methods of mechanical properties of ordinary concrete (GB/T50081-2002) " carries out.
Mix-design is (water cement ratio 0.43, sand coarse aggregate ratio 38%):
| Type | Water cement ratio | Water | Cement | Fine aggregate | Coarse aggregate | Nanometer NS | Water reducer |
| Do not mix NS | 0.43 | 235 | 535 | 620 | 1010 | 0 | 8.01 |
| Mix NS | 0.43 | 235 | 527 | 620 | 1010 | 8.1 | 7.89 |
Test-results:
Different embodiment prove, that is prepared by present method mixes early strong high performance concrete of nano silica powder, contrast the normal concrete of same mix-design, the folding strength in the 7 day length of time can improve 214%--396%, tensile splitting strength can improve 28.9%--43.0%, and ultimate compression strength can improve 6.13%--17.2%; The tensile splitting strength in the 28 day length of time can improve 7.8%-22.2%.This early strength concrete can be used for the high-rise building of winter construction and normal temperature and cold condition the concrete works of early stage requirement, has great engineering practical value and significant Technological Economy meaning.
Claims (9)
1. mix the early strong high performance concrete of nano silica powder, it is characterized in that component and content are as follows: cement 519 ~ 550kg/ m
3, coarse aggregate 1010 ~ 1040kg/ m
3, fine aggregate 600 ~ 620kg/ m
3, water 225 ~ 235kg/ m
3, high-performance water reducing agent 7.77 ~ 9.1kg/ m
3, nano silicon 8.1 ~ 16.2kg/ m
3, proportioning is: sand coarse aggregate ratio 37 ~ 38%, water cement ratio 0.40 ~ 0.43.
2. one as claimed in claim 1 is mixed the early strong high performance concrete of nano silica powder, it is characterized in that: described cement is the silicate cement that strength grade is not less than PC32.5 level.
3. one as claimed in claim 1 is mixed the early strong high performance concrete of nano silica powder, it is characterized in that: described fine aggregate is river sand or medium sand, and silt content is less than 3%.
4. one as claimed in claim 1 is mixed the early strong high performance concrete of nano silica powder, it is characterized in that: the particle diameter of described coarse aggregate is 5-35mm.
5. one as claimed in claim 1 is mixed the early strong high performance concrete of nano silica powder, it is characterized in that: the water-reducing rate of described high-performance water reducing agent is not less than 25%.
6. one as claimed in claim 5 is mixed the early strong high performance concrete of nano silica powder, it is characterized in that: described high-performance water reducing agent is naphthalene series concrete high efficiency water reducing agent or polycarboxylate high-efficiency water reducing agent.
7. one as claimed in claim 1 is mixed the early strong high performance concrete of nano silica powder, it is characterized in that: described nano silicon median size 30 ± 5nm, specific surface area 200 ± 30mm
2/ g, content>=99.5%.
8. a kind of preparation method who mixes the early strong high performance concrete of nano silica powder described in any one in claim 1 ~ 7, is characterized in that comprising the steps:
1) water of high-performance water reducing agent, nano silicon, 60-70%, is stirred into mixed solution;
2) in concrete mixer, coarse aggregate, fine aggregate and cement mixing are evenly become to solid mixt;
3) by step 1) mixed solution, step 2) water of solid mixt, residue 30-40%, stir 180-240 second, be stirred into concrete mix.
9. a kind of preparation method who mixes the early strong high performance concrete of nano silica powder described in claim 8, is characterized in that: described mixing speed is 30r/min.
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| CN104628335A (en) * | 2015-02-09 | 2015-05-20 | 沈阳大学 | Method for preparing nanometer silicon dioxide high-performance concrete |
| CN104860593A (en) * | 2015-05-13 | 2015-08-26 | 刘勇 | Construction waste recycled aggregate water milled colorful paving brick and preparation method thereof |
| CN105777011A (en) * | 2016-03-24 | 2016-07-20 | 西京学院 | Preparation method of high-strength high-toughness anti-fatigue modified fiber recycled concrete |
| CN105859227A (en) * | 2016-04-01 | 2016-08-17 | 成都理工大学 | High-early strength nano-composite cement-based water shutoff reinforcing material |
| CN105948652A (en) * | 2016-05-09 | 2016-09-21 | 西京学院 | Preparation method of binary high strength and high elastic modulus hybrid fiber reinforced nano recycled concrete |
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| CN113402234A (en) * | 2021-07-26 | 2021-09-17 | 安徽筑园景新型建材科技有限公司 | Reinforced polymer cement concrete and preparation method thereof |
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| CN108168973A (en) * | 2017-12-27 | 2018-06-15 | 中国地质大学（武汉） | A kind of production method and device of inside face containing non-through structure similar material model |
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| CN115959851A (en) * | 2022-12-20 | 2023-04-14 | 武汉科技大学 | Early strength agent suitable for high-doping-amount low-quality fly ash cement-based material and preparation method thereof |
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