CN108516768A - A kind of high performance concrete and preparation method thereof for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture - Google Patents
A kind of high performance concrete and preparation method thereof for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture Download PDFInfo
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- CN108516768A CN108516768A CN201810494616.7A CN201810494616A CN108516768A CN 108516768 A CN108516768 A CN 108516768A CN 201810494616 A CN201810494616 A CN 201810494616A CN 108516768 A CN108516768 A CN 108516768A
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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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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of high performance concretes and preparation method thereof for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture.Every cubic meter of concrete includes the raw material of following parts by weight：600~720 parts of cement, 50~100 parts of admixture, 850~1000 parts of coarse aggregate, 550~650 parts of fine aggregate, 90~130 parts of water, it with mass ratio is that 2~10 ︰, 2~10 ︰ 0.001~0.08 are formed that 13~25 parts of water-reducing agent, wherein admixture, which are rice hull ash, silicon ash and carbon nanotube,.The present invention is using rice hull ash, silicon ash and carbon nanotube as admixture, it is mutually excited between three kinds of admixture raw materials, early stage and the later strength of concrete can not only be improved, moreover it is possible to be effectively improved the microfissure of concrete, and so that working performance of concrete, mechanical property are promoted.Meanwhile the admixture that the present invention uses not only had alleviated the pressure that high-strength concrete supplies silicon ash and ultrafine slag powder, but also the utilization rate of agricultural wastes rice hull ash is improved, meet the needs of sustainable development.
Description
Technical field
The invention belongs to building material field, rice hull ash, silicon ash and carbon nanotube are used to mix more particularly, to a kind of
Close high performance concrete and preparation method thereof prepared by material.
Background technology
Cement concrete be used as the most large, the most widely used artificial material, be bridge, building, highway, water conservancy,
The main architecture engineering material of traffic etc..Cement concrete has that material source is extensive, construction technology is simple, plasticity before hardening
By force, low power consumption and other advantages.Cement concrete has the advantages of many other materials can not match in excellence or beauty.But cement concrete is conducted oneself with dignity
Greatly, poor ductility, it is easy to crack the shortcomings of also greatly limit the application of cement concrete, so that it is faced with sternness and choose
War.As a kind of fragile material, there are a large amount of cracks inside cement concrete, with the continuous effect of peripheral load, inside
Micro-crack can gradually extend, converge, ultimately form macroscopic cracking, concrete structure caused to destroy.
With the development of nano material, domestic and foreign scholars, which start nano-scale scale fiber, is improving concrete microfissure
Aspect plays the possibility of useful effect.Currently, since carbon nanotube production cost is higher, and the more low factor of yield limits it
Application in actual industrial, most scholar only have studied carbon nano-tube modification cement mortar or cement paste, for carbon nanometer
The research of pipe modified concrete is very few, and the especially research in terms of super high strength high performance coagulation is even more phoenix feathers and unicorn horns.Many institutes
Known, the brittleness of concrete increases with increasing for intensity, the more higher easier cracking of intensity.Therefore, carbon nano-tube modification is super
High-strength high-performance concrete is studied carefully with important experiment meaning and value, it is necessary to which the system of progress is comprehensively studied.
Invention content
The purpose of the present invention is to provide a kind of high-performance for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture
Concrete.The present invention as admixture, is mutually excited between three, can not only be carried using rice hull ash, silicon ash and carbon nanotube
The early strength and later strength of high concrete, moreover it is possible to be effectively improved the microfissure of concrete, high-strength and high performance is prepared
Concrete.
The above-mentioned purpose of the present invention is achieved by following scheme：
A kind of high performance concrete for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture, per cubic meter of concrete packet
Include the raw material of following parts by weight：600~720 parts of cement, 50~100 parts of admixture, 850~1000 parts of coarse aggregate, fine aggregate
550~650 parts, 90~130 parts of water, 13~25 parts of water-reducing agent, wherein admixture are rice hull ash, silicon ash and carbon nanotube with quality
Than being formed for 2~10 ︰, 2~10 ︰ 0.001~0.08.
Carbon nanotube is a kind of monodimension nanometer material, and draw ratio may be up to 1000：1 or more, to inhibiting micro-crack extension
Greatly effect is played with being formed.
Rice hull ash is the extremely abundant agricultural wastes of china natural resources, but it has huge potential value.Due to its change
Learning activity can match in excellence or beauty silicon ash, can replace or part prepares super high strength concrete instead of silicon ash.Rice hull ash is porous structure, leads to it
It is the several times of silicon ash with huge specific surface area.But with the increase of volume, the huge specific surface area of rice hull ash makes its absorption
A large amount of water, causes mobile performance to reduce.For ensure mobility, then need use more water, do not meet it is energy-saving and environment-friendly go out
Hair point.
Silicon ash is a kind of spheric granules that surface is smooth, has lubricating action and ball effect, specific surface area is compared with rice husk
Ash is small, though so the incorporation of silicon ash is adsorbed a part of water mobile performance and is reduced seldom.Silicon ash is a kind of spheric granules, surface ten
Light splitting is slided, and silicon ash is mixed again with rice hull ash, can effectively improve the problem of water requirement caused by the huge specific surface area of rice hull ash increases,
Remarkable effect is played to improving cement mortar mobile performance.And silicon ash is different from rice hull ash grain size, keeps grading more reasonable, multiple
Mixing rice hull ash, silicon ash can mutually excite, modified synergic Mechanical Properties of Cement-based Materials.
In carbon nanotube-cement system, the physics humidification such as filling, carrying, bridging and extraction of carbon nanotube accounts for master
Status is led, can effectively reduce and inhibit micro-crack, effectively share and transmit external force, so as to improve cement-based material mechanical property
Energy.The physics filling effect of carbon nanotube can improve cement-based material resisting chloride ion penetration performance to a certain extent.
And when the admixture silicon ash of high pozzolanic activity, rice hull ash addition when, can promote hydration reaction, reduce hydroxide
Calcium aligns, and generates hydrated calcium silicate gel filling pore, and cement-based material density is made to improve.Therefore, a certain amount of silicon
Grey, rice hull ash admixture keeps cement-based material structure more closely knit, is effectively improved Mechanical Properties of Cement-based Materials.It is worth mentioning
It is that silicon ash is mixed in carbon nano-tube enhanced cement-base composite material, effective dispersion of carbon nanotube can be promoted, and can carry
Adhesion strength between high carbon nanotube and cement matrix interface.This is because the particle size of silicon ash is between 10~500nm,
It is closer to the diameter dimension of carbon nanotube, when the carbon nanotube of silicon ash particle and reunion mixes, can effectively disperse carbon
Nanotube.In addition, the main component of silicon ash is amorphous Si O2, there is under room temperature very high chemical reactivity, it can be with water
The calcium hydroxide reaction that muddy waterization generates generates C-S-H gels, can form physics anchor point in carbon nanotube tube wall surface, from
And effectively improve the interface binding intensity between carbon nanotube and cement matrix.As it can be seen that nanoscale particle can promote carbon to receive
Effective dispersion of the mitron in cement admixture can also improve carbon nanotube and water especially when it is with high chemism
Adhesive property between mud basal body interface.
Preferably, include the raw material of following parts by weight per cubic meter of concrete：600~650 parts of cement, admixture 80~
100 parts, 900~920 parts of coarse aggregate, 600~620 parts of fine aggregate, 110~120 parts of water, 18~20 parts of water-reducing agent, wherein blending
It with mass ratio is that 2~10 ︰, 2~10 ︰ 0.001~0.05 are formed that material, which is rice hull ash, silicon ash and carbon nanotube,.
Preferably, include the raw material of following parts by weight per cubic meter of concrete：633.6 parts of cement, admixture 85~87
Part, 913 parts of coarse aggregate, 608.7 parts of fine aggregate, 115.2 parts of water, 19~20 parts of water-reducing agent, wherein admixture are rice hull ash, silicon ash
It is formed for 10 ︰, 2 ︰ 0.05 with mass ratio with carbon nanotube.
Preferably, Nano-meter SiO_2 in the rice hull ash2Content be more than gross mass 90%.
Preferably, the draw ratio of the carbon nanotube is 200~1000.
Preferably, the particle size of the silicon ash is 10~500nm.
Preferably, the coarse aggregate include particle size be 5~10mm pawl rice stones and particle size be 10~18mm flower hilllock
Rock rubble.
The present invention also protects the high-performance coagulation for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture simultaneously
The preparation method of soil, described method includes following steps：
S1. first rice hull ash low temperature burned, crushed, be then uniformly mixed rice hull ash, silicon ash and carbon nanotube；
S2. then cement, admixture, coarse aggregate, fine aggregate, water-reducing agent and water are mixed according to above-mentioned formula, you can system
It is standby to obtain high-strength high-performance concrete.
Compared with prior art, the invention has the advantages that：
For the present invention using rice hull ash, silicon ash and carbon nanotube as admixture, wherein rice hull ash and silicon ash raw material are cheap, easily obtain
It takes；It is mutually excited between three kinds of admixture raw materials, can not only improve the early strength and later strength of concrete, moreover it is possible to effectively
Improve the microfissure of concrete, and so that working performance of concrete, mechanical property are promoted.Meanwhile the present invention uses
Admixture not only alleviated the pressure that high-strength concrete supplies silicon ash and ultrafine slag powder, but also improve agricultural wastes preparation
Rice hull ash be admixture efficiency, meet the needs of sustainable development.
Specific implementation mode
The present invention is made with reference to specific embodiment and further being elaborated, the embodiment is served only for explaining this
Invention, is not intended to limit the scope of the present invention.Test method used in following embodiments is normal unless otherwise specified
Rule method；Used material, reagent etc., unless otherwise specified, for the reagent and material commercially obtained.
Embodiment 1
1, the preparation process for the high performance concrete that rice hull ash, silicon ash and carbon nanotube prepared for admixture is used：
（1）The preparation process of composite blend：After rice husk low temperature is burned 1h, using ball mill grinding 1h, Nano-meter SiO_2 is obtained2
Content reaches 90% or more rice hull ash, by it with an angstrom silicon ash, carbon nanotube mixing to get composite blend.
（2）Then cement, admixture, coarse aggregate, fine aggregate, water-reducing agent and water are mixed according to specific proportioning,
High-strength high-performance concrete can be prepared.
Carbon nanotube (CNT) used is that the finely dispersed carbon nanotube of the production of Shenzhen nanometer port Co., Ltd is water-soluble
Liquid（CNT contents about 5wt%）, liquid is in black, and draw ratio is between 200~1000；Silicon ash used is purchased from angstrom willing international trade
（Shanghai）Co., Ltd, model 920U, cement are purchased from Guangzhou Zhujiang Cement Co., Ltd., for golden sheep board P.II.525R water
Mud；Fine aggregate is that sea sand is washed in Guangzhou Yuexiu District, and fineness modulus 2.46, middle sand, grading curve is 2nd area；Coarse aggregate is Huizhou
5~10mm pawl rice stones of Boluo stone field production（) and 10~18mm granite stones C.A1（C.A2）；Water-reducing agent is purchased from Guangzhou West card
Construction material Co., Ltd is Viscocrete3301-40 type high performance water reducing agent of polyocarboxy acid, solid content 40%.
Rice hull ash（RHA）With silicon ash（SF）Chemical composition is shown in Table 1.
1 rice hull ash of table（RHA）With silicon ash（SF）Chemical composition
Wherein rice hull ash and silicon ash kind SiO2Content 90%（wt）More than.
2, concrete is prepared as composite blend using rice hull ash and silicon ash
Concrete is prepared according to the formula in table 2, and detects the performance for the concrete being prepared, to test rice hull ash, silicon ash
Influence as composite blend to concrete performance.Concrete performance examination the results are shown in Table shown in 3.
Table 2 prepares the formula of concrete using rice hull ash and silicon ash as composite blend
Table 3 is composite blend to the influence result of mechanical performance of concrete and working performance using rice hull ash and silicon ash
As shown in table 3, the incorporation of rice hull ash and silicon ash can cause working performance of concrete to reduce, the incorporation with rice hull ash and silicon ash
It is almost the same that result is influenced on flow of cement mortar.When Silica fume content is 10%, concrete is in slump maximum, with benchmark
Group maintains an equal level.Rice hull ash concrete is on a declining curve with the admixture of rice hull ash volume, when rice hull ash volume is 10%, 15%, collapses
Degree of falling drops to 220mm.10% rice hull ash is singly mixed in comparison, and when+2% silicon ash of 10% rice hull ash is mixed again, counter increase to does not drop in the slump
225mm.With the increase for mixing middle silicon ash ratio again, concrete slump gradually increases.When+6% silicon ash of 6% rice hull ash is mixed again, collapse
Degree of falling increases to 230mm.10% silicon ash is singly mixed in comparison, and when+10% silicon ash of 2% rice hull ash is mixed again, the slump, which does not drop, counter increases to 235mm.By
This is it is found that rice hull ash has fabulous synergistic effect with silicon ash, and the two is mixed again can greatly improve working performance of concrete, and 10%
+ 2% rice hull ash of silicon ash is mixed again to be played the role of being obviously improved to working performance of concrete.
Under each age, mechanical performance of concrete can be improved by singly mixing rice hull ash, silicon ash and rice hull ash+silicon ash and mixing again, and
Rice hull ash+silicon ash is mixed again promotes bigger to concrete strength.When 3d ages, it is 5% singly to mix silicon ash the optimum mix amount, concrete anti-compression
Intensity reaches 62.67MPa；It is 10% singly to mix rice hull ash the optimum mix amount, and concrete crushing strength reaches 61.03MPa；Most preferably mix again
Ratio is+2% rice hull ash of 10% silicon ash, and concrete crushing strength reaches 63.83MPa.
When 7d ages, it is 10% singly to mix silicon ash the optimum mix amount, and concrete crushing strength reaches 82.83MPa；Singly mix rice hull ash
The optimum mix amount is 5%, and concrete crushing strength reaches 80.2MPa；Best ratio of mixing again is+2% rice hull ash of 10% silicon ash, concrete
Compression strength reaches 85.69MPa.
When 28d ages, it is 10% singly to mix silicon ash the optimum mix amount, and concrete crushing strength reaches 101.74MPa；Singly mix rice husk
Grey the optimum mix amount is 5%, and concrete crushing strength reaches 98.02MPa；Best ratio of mixing again is+2% rice hull ash of 10% silicon ash, coagulation
Native compression strength reaches 109.39MPa.
As can be seen that+2% rice hull ash of 10% silicon ash mix again to each age compression strength of concrete promoted effect it is the most notable.
This is because silicon ash surface is smooth, and it is rounded, there is ball effect.Rice hull ash is porous material, can adsorb cement matrix in right amount
Water in material makes practical water-cement ratio reduce, mechanical property enhancing.The two grain size is different, and good grading can be formed by mutually adding,
Mutually excitation, plays the role of being obviously improved to Mechanical Properties of Cement-based Materials.
Embodiment 2
On the basis of the test result that embodiment 1 obtains, it is known that silicon ash and rice hull ash mix ratio again when being 10%SF+2%RHA,
Collaboration improvement cement-based material properties effect is the most excellent, therefore is mixed again instead of cement as benchmark using 10%SF+ 2%RHA
Group probes into different addition quantity CNT under fixed water-cement ratio（0%、0.01%、0.05%、0.08%）To super high strength high performance concrete
The influence of working performance, mechanical property.
Concrete is prepared according to the formula in table 4, the performance test results of the concrete are shown in Table 5.
Table 4 prepares the formula of high performance concrete using rice hull ash, silicon ash and carbon nanotube as composite blend
Note：It is aqueous that water consumption need to deduct institute in CNT aqueous solutions
5 rice hull ash of table, silicon ash and carbon nanotube are the performance test results of high performance concrete prepared by composite blend
As shown in table 5, working performance of concrete is presented as the incorporation of carbon nanotube increases and is greatly reduced with cement mortar
Identical rule.When CNT volumes increase to 0.05%, the slump declines to a great extent to 220mm.0.1% is continued to increase in CNT volumes
When, slump reduction to 210mm.It is noted that although the incorporation of carbon nanotube makes concrete slump decline, collapse
Degree remains at 210mm or more, and workability is good, can meet modernization Practical Project pumping requirements.The above results show that mixed
Solidifying soil compression strength is as the incorporation of carbon nanotube increases and increases.When 3d, 7d, 28d age, optimum C/N T volumes are 0.05%
When, concrete crushing strength promotes 19%, 15%, 9% compared with benchmark group respectively.This is because in carbon nanotube-cement system, carbon is received
The physics humidification such as filling, carrying, bridging and extraction of mitron is occupied an leading position, and micro-crack can be effectively reduced and inhibit,
External force is effectively shared and transmits, so as to improve Mechanical Properties of Cement-based Materials.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than is protected to the present invention
The limitation of shield range can also be made on the basis of above description and thinking for those of ordinary skill in the art
Other various forms of variations or variation, there is no necessity and possibility to exhaust all the enbodiments.It is all the present invention
All any modification, equivalent and improvement etc., should be included in the protection of the claims in the present invention made by within spirit and principle
Within the scope of.
Claims (7)
1. a kind of high performance concrete for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture, which is characterized in that often stand
Square rice concrete includes the raw material of following parts by weight：600~720 parts of cement, 50~100 parts of admixture, coarse aggregate 850~
1000 parts, 550~650 parts of fine aggregate, 90~130 parts of water, 13~25 parts of water-reducing agent, wherein admixture be rice hull ash, silicon ash and
Carbon nanotube is that 2~10 ︰, 2~10 ︰ 0.001~0.08 are formed with mass ratio.
2. the high performance concrete for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture according to claim 1,
It is characterized in that, includes the raw material of following parts by weight per cubic meter of concrete：600~650 parts of cement, 80~100 parts of admixture,
900~920 parts of coarse aggregate, 600~620 parts of fine aggregate, 110~120 parts of water, 18~20 parts of water-reducing agent, wherein admixture are rice
Shell ash, silicon ash and carbon nanotube are that 2~10 ︰, 2~10 ︰ 0.001~0.05 are formed with mass ratio.
3. the high performance concrete for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture according to claim 2,
It is characterized in that, includes the raw material of following parts by weight per cubic meter of concrete：633.6 parts of cement, 85~87 parts of admixture, thick bone
913 parts of material, 608.7 parts of fine aggregate, 115.2 parts of water, 19~20 parts of water-reducing agent, wherein admixture are that rice hull ash, silicon ash and carbon are received
Mitron is that 10 ︰, 2 ︰ 0.05 are formed with mass ratio.
4. mixed according to any high-performance for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture of claims 1 to 3
Solidifying soil, which is characterized in that Nano-meter SiO_2 in the rice hull ash2Content be more than gross mass 90%.
5. mixed according to any high-performance for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture of claims 1 to 3
Solidifying soil, which is characterized in that the draw ratio of the carbon nanotube is 200~1000.
6. mixed according to any high-performance for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture of claims 1 to 3
Solidifying soil, which is characterized in that the particle size of the silicon ash is 10~500nm.
7. mixed according to any high-performance for using rice hull ash, silicon ash and carbon nanotube to be prepared for admixture of claims 1 to 3
Solidifying soil, which is characterized in that it is 5~10mm pawl rice stones and particle size is 10~18mm flowers hilllock that the coarse aggregate, which includes particle size,
Rock rubble.
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| CN109138310A (en) * | 2018-10-23 | 2019-01-04 | 黄贺明 | A kind of superhigh tenacity concrete inorganic decorating board and preparation method thereof of the surface containing pattern |
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| CN113816695A (en) * | 2021-10-26 | 2021-12-21 | 西安建筑科技大学 | Carbon nanotube modified concrete and preparation method and application thereof |
| CN115716736A (en) * | 2022-11-25 | 2023-02-28 | 华能陇东能源有限责任公司正宁电厂 | High-performance concrete based on high-concentration strong brine modification technology and preparation method thereof |
| DE202023102643U1 (en) | 2023-05-15 | 2023-06-07 | Abhinav Bhargav | Composition for sustainable construction fine concrete using PVA nano-calcium carbonate powder and soybean hull |
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