CN1621384A - Nanometer based concrete modifier - Google Patents
Nanometer based concrete modifier Download PDFInfo
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- CN1621384A CN1621384A CNA2003101059860A CN200310105986A CN1621384A CN 1621384 A CN1621384 A CN 1621384A CN A2003101059860 A CNA2003101059860 A CN A2003101059860A CN 200310105986 A CN200310105986 A CN 200310105986A CN 1621384 A CN1621384 A CN 1621384A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The present invention relates to building material technology, and is especially one kind of nanometer concrete modifier with raised concrete durability improving effect. The present invention blocks the large and small holes and micropores inside concrete with materials of different fineness and properties. The present invention selects calcium lignosulfonate, ground industrial slag and nanometer powder as concrete modifier added into cement to raise the content of nanometer crystals, raise the crystal/colloid ratio of cement rock, decrease the seepage degree of cement rock and raise the durability of concrete.
Description
One, technical field:
The present invention relates to a kind of building material technical field, is a kind of nano based concrete modifying agent specifically.
Two, technical background:
In northern China cold district and salinization area, the freeze injury of concrete structure destroys (as the crack and peel off etc.), CI
-Iontophoretic injection and SO
4 2-Ion erosion is all more serious, thereby may cause a series of diseases such as seepage, cracking of concrete works, reduces its weather resistance and security.Therefore, the concrete that produces disease being carried out repairing and reinforcing, is one of principal element that improves concrete durability.
Lower grade of Strength of Common (≤C30), strengthen concrete impervious, freezing tolerance, will certainly improve strength grade of concrete, increase its construction cost, the Harmony of itself and surrounding medium is reduced.
And the method for improving concrete durability (especially frost resistance and impermeability) now is to improve methods such as concrete degree of compactness and employing polymer mortar, but these measures can only improve the hole minimizing of inside concrete greater than 400nm, and its aperture increases, and its concrete durability improves not remarkable.
Three, summary of the invention:
The object of the present invention is to provide a kind of nano based concrete modifying agent that utilizes the nano based material to improve concrete durability.
For achieving the above object, the technical solution used in the present invention is:
A kind of nano based concrete modifying agent, the composition proportioning of its compositing formula and parts by weight meter is as follows:
Calcium lignin sulphonate is 0.2%～0.4% of a cement consumption
Ground industrial slag is 4.2%～4.7% of a cement consumption
Nano powder is 0.1%～0.4% of a cement consumption
The composition proportioning of above-mentioned compositing formula and parts by weight meter is as follows:
Calcium lignin sulphonate is 0.3% of a cement consumption
Ground industrial slag is 4.5% of a cement consumption
Nano powder is 0.2% of a cement consumption
Above-mentioned compositing formula can add 0.1%～0.2% the micro foam agent that parts by weight are cement consumption.
Ground industrial slag in the above-mentioned compositing formula is silica flour, ground slag, flyash.
Nano powder in the above-mentioned compositing formula is a silicon oxide.
The present invention compared with prior art, its advantage is as follows:
Nano based concrete modifying agent volume accounts for 5% o'clock of cement consumption, and its material is compared its concrete testing data with the Portland cement material as follows: 28d ultimate compression strength improves about 20%～30%; Infiltration highly reduces about 50%; Freeze proof grade improves about 100%.
Four, description of drawings:
Resistance to compression when Fig. 1 is water cement ratio 0.38, folding strength (MPa);
Resistance to compression when Fig. 2 is water cement ratio 0.48, folding strength (MPa);
Five, embodiment:
Mechanism of modification of the present invention is analyzed as follows:
When some material particle reaches 10
-9In the time of near (millimicron) nano level, the character that both had been different from the large size macro object be will form, the atom of microcosmic particle, the mesoscopic material-nano material with unusual characteristic of molecular property are different from again.It has unimaginably queer huge specific surface area (＞200m
2/ g), thereby high advantageous properties such as chemical mobility of the surface are arranged, this is useful for the hydration rate and the strength development degree that improve cement.In addition, it also has small-size effect and macro quanta tunnel effect.
Nano powder is from broadly being to belong to accurate zero-dimension nano material category, and the scope of size is at 1～100nm.The basic theories of describing it is Kubo (Kubo) theory.The preparation method of nano powder has physical method: vacuum condensation method, physical pulverization method and mechanical ball milling method; Chemical process has vapour deposition process, the precipitator method, hydrothermal synthesis method, sol-gel method and microemulsion method etc.
For the Portland cement hardened paste, its overall porosity is about 15%～30%.This can be divided into the hydrated calcium silicate gel hole of nanoscale (9-10nm); By being present in the bubble between the hydrated cementitious product, the pore that the crack is formed, size is greatly between 100nm is to several millimeters.And, between its nano level hydrated calcium silicate gel chemical action a little less than, rarelyr form network-like structure preferably by third party's chemical bonding.Can add bonding and the network-like structure of nano based material to improve hydrated product.
Though add polymkeric substance, water reducer and super finely ground slag etc. diameter is reduced greater than the macropore ratio of 400nm, increase less than the aperture content of 150nm; Can reduce the micropore of 5～150nm in the hardening of cement slurry behind the adding nano powder effectively, and nano powder can with nano level hydrated product bonding in large quantities, and be nucleus with the nano powder, form the hydrated calcium silicate gel phase on its surface, it is the network-like structure of core that loose hydrated calcium silicate gel is become with the nano powder; Suitably increase the content of nanocrystal,, reduce the creep degree of cement stone to improve the brilliant glue ratio of cement stone, thus the concrete that acquisition has increased durability.
The present invention utilizes " monosodium glutamate " of nano powder as concrete admixture by to being applied to the research of concrete industrial residue, and its improvement to concrete performance is further improved.Adopt " step shutoff " technology, promptly use the material of different fineness and character, respectively the method for the large and small and micropore in the blocking concrete (mortar).
According to nano based concrete modifying agent proportioning and role, the proportioning that can obtain nano based concrete modifying agent of the present invention is as follows:
1, calcium lignin sulphonate
Its volume is approximately 0.2%～0.4% of cement consumption, and it mainly is in order to improve the workability of concrete (mortar), to improve its workability in properties-correcting agent.
2, ground industrial slag
Its volume is about 4.2%～4.7% of cement consumption.Its effect in properties-correcting agent is bond performance, the shutoff macropore of regulating concrete (mortar) and saves cost etc.It generally selects silica flour, ground slag, flyash etc. for use.
3, nano powder
Its volume is about 0.1%～0.4% of cement consumption, and it can bring into play excellent properties such as its corpuscular property and overactivity in concrete (mortar), shutoff aperture and micropore, improves its intensity and weather resistance (especially concrete impervious and anti-freezing property etc.).It generally selects materials such as silicon oxide for use.
4, other composition
In order further to improve product performance, except that above composition, according to circumstances, can consider admixture and be other compositions such as 0.1%～0.2% micro foam agent (micro foam agent selects for use Wanrong, Shanxi concrete admixture factory to produce), UEA of cement consumption.
Product performance of the present invention are as follows:
Color: pale powder shape
Aerated density: 0.29g/cm
3
Toxicity: nontoxic
Stability: qualified
Solvability: water-soluble
Modified effect: (volume account for cement consumption 5%)
28d ultimate compression strength improves about 20%～30%;
Infiltration highly reduces about 50%;
Freeze proof grade improves about 100%.
Construction technology of the present invention adopts earlier the method for the mixing construction that is dissolved in water.
Specific embodiment one:
Adding the nano based concrete modifying agent in the cement of 1000kg, specifically is the calcium lignin sulphonate of 2kg, the flyash of 4.2kg and the nano oxidized silicon powder of 1kg, adopts earlier the method for the mixing construction that is dissolved in water again.
Specific embodiment two:
Adding the nano based concrete modifying agent in the cement of 1000kg, specifically is the calcium lignin sulphonate of 4kg, the ground slag of 4.7kg and the nano oxidized silicon powder of 4kg, adopts earlier the method for the mixing construction that is dissolved in water again.
Specific embodiment three:
Adding the nano based concrete modifying agent in the cement of 1000kg, specifically is the calcium lignin sulphonate of 3kg, the ground slag of 4.5kg and the nano oxidized silicon powder of 2kg, adopts earlier the method for the mixing construction that is dissolved in water again.
Specific embodiment four:
Adding the nano based concrete modifying agent in the cement of 1000kg, specifically is the calcium lignin sulphonate of 3kg, the ground slag of 4.5kg, the nano oxidized silicon powder of 2kg and the micro foam agent of 1kg, adopts earlier the method for the mixing construction that is dissolved in water again.
By the optimization of nano based concrete modifying agent, mortar and concrete test research, the nano based concrete modifying agent is as follows to concrete modified effect:
1, the nano based material can be accelerated the setting and harden of concrete (mortar).
Because the corpuscular property and the high reactivity of nano based material, make reaction area and reaction path in the cement stone increase, surface effects strengthens, thus the hydration reaction of mortar (concrete) test specimen inside mortar (concrete) test specimen of more not mixing nano powder is wanted fast and development fully.But wherein the volume of nano powder can not surpass certain limit, because the nano based material will consume a large amount of water of hydrations and the hydration process of cement particle formed hinder, thereby volume is excessive makes its time of coagulation slack-off on the contrary.
Increase along with nano based properties-correcting agent volume, the presetting period of cement paste and final setting time are in 0%～3% scope, the gesture that presents progressively shortening, the more common clean slurry presetting period has approximately shortened 66% when 3% volume, final setting time has then shortened 47%, and its effect that improves mortar (concrete) coagulating hardening performance is very obvious; But after its volume surpasses 3%, begin slow increase the time of coagulation of cement stone, but still less than common test specimen.
2, the soundness test result of the cement paste of admixture nano based concrete modifying agent
According to the cement testing standard, the cement paste stability pat of moulding admixture nano powder is checked its stability with boiling process, does not have destabilization phenomenons such as bending, crisp, be full of cracks, collapse through observing this modification pat.In process of the test, can also see admixture nano powder test specimen cohesiveness, water-retentivity be improved significantly.Trace it to its cause and to think behind the admixture nano powder that the content of the f-CaO in the cement stone and f-MgO is little even reduce, and the admixture material can increase the viscosity of cement stone, improve ultimate compression strength and resistance to bend.
3, mortar strength test-results
By the mortar test as can be seen, because many characteristics of nano powder, its intensity raising effect to mortar (concrete) is tangible.Referring to Fig. 1,2.
When w/c changes between 0.38～0.58, properties-correcting agent volume 3%～5% o'clock, the intensity of the compressive strength rate benchmark group of 7d improves 5.1%～29.7%, and the folding strength of 7d improves 3.7～17.9% than benchmark group; 28d compressive strength rate benchmark group improves 27.9%～44.2%, and the 28d folding strength improves 9.2%～17.7% than benchmark group.
4, concrete permeability resistance test-results
Behind the admixture nano based concrete modifying agent, aperture and micropore in the concrete are all declined to a great extent, improved concrete degree of compactness effectively, thereby improved the impermeability of concrete (mortar).
Draw through experimental study, the mortar (concrete) of admixture nano based concrete modifying agent all significantly improves than the anti-permeability performance with the ordinary mortar (concrete) of proportioning, sees Table 1.
Table 1. mortar (concrete) is relatively impervious
| Mortar | Concrete | Remarks | |||
| Maximum withstand voltage (MPa) | Impervious coefficient (MPah) | Maximum hydraulic pressure (MPa) | Infiltration height (cm) | Mortar M7.5; Concrete C20; The properties-correcting agent volume is 5% | |
| Common | ????0.10 | ????0.174 | ????1.20 | ????5.1 | |
| Modification | ????0.30 | ????0.354 | ????1.20 | ????1.7 | |
From above chart as can be seen, its mortar and concrete impermeability approximately improve 1～3 times after the modification.
5, frost resistance test-results
Behind the admixture nano based concrete modifying agent, greatly improved the pore texture of inside concrete, shutoff aperture, the micropore of aperture less than 150nm, make concrete degree of compactness strengthen greatly, reduced the pore water storage in the concrete structure, thereby avoided because the pore water freezing and expansion, produced the crack and cause destroying concrete structure.The test specimen of M7.5 is adopted in test, test with the method for freezing slowly, the test specimen of admixture 5% nano based concrete modifying agent and common test specimen, the outward appearance of the test specimen of admixture 5% nano based concrete modifying agent substantially becomes after freeze thawing 15 times, and common test specimen outward appearance has obviously produced phenomenons such as crack.
Through further test, freeze-thaw damage just takes place in the test specimen that is mixed with the nano based concrete modifying agent after freeze thawing 60 times.Through to the analysis of testing data as can be known, its frost resistance approximately improves 2～3 times behind the admixture properties-correcting agent.
Except that above test, also carried out elasticity modulus test, sulphate attack test of admixture properties-correcting agent and common test specimen etc., the result shows that the weather resistance of concrete and mortar all has bigger improvement.
Claims (5)
1, a kind of nano based concrete modifying agent, the composition proportioning of its compositing formula and parts by weight meter is as follows:
The calcium lignin sulphonate consumption is 0.2%～0.4% of a cement consumption
The ground industrial slag consumption is 4.2%～4.7% of a cement consumption
The nano powder consumption is 0.1%～0.4% of a cement consumption
2, according to right 1 described nano based concrete modifying agent, it is characterized in that: the composition proportioning of described compositing formula and parts by weight meter is as follows:
The calcium lignin sulphonate consumption is 0.3% of a cement consumption
The ground industrial slag consumption is 4.5% of a cement consumption
The nano powder consumption is 0.2% of a cement consumption
3, according to right 1 or 2 described nano based concrete modifying agents, it is characterized in that: described compositing formula can add 0.1%～0.2% the micro foam agent that parts by weight are cement consumption.
4, according to right 1 or 2 described nano based concrete modifying agents, it is characterized in that: the ground industrial slag in the described compositing formula is silica flour, ground slag, flyash.
5, according to right 1 or 2 described nano based concrete modifying agents, it is characterized in that: the nano powder in the described compositing formula is a silicon oxide.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101059860A CN1296308C (en) | 2003-11-28 | 2003-11-28 | Nanometer based concrete modifier |
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|---|---|---|---|
| CNB2003101059860A CN1296308C (en) | 2003-11-28 | 2003-11-28 | Nanometer based concrete modifier |
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| CN1621384A true CN1621384A (en) | 2005-06-01 |
| CN1296308C CN1296308C (en) | 2007-01-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110684A (en) * | 2015-08-31 | 2015-12-02 | 广西路佳道桥勘察设计有限公司 | Concrete and modifier thereof |
| CN106242345A (en) * | 2016-07-19 | 2016-12-21 | 甘肃智通科技工程检测咨询有限公司 | A kind of nanometer base cement modifier |
| CN112028541A (en) * | 2020-09-09 | 2020-12-04 | 江西省建筑材料工业科学研究设计院 | Concrete nano reinforcing modifier and preparation method thereof |
| CN113683337A (en) * | 2021-08-24 | 2021-11-23 | 北京工业大学 | Preparation and use methods of additive for reducing concrete creep |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529224A (en) * | 2014-12-23 | 2015-04-22 | 苏州万盛混凝土有限公司 | Concrete modifier |
| CN104478341A (en) * | 2014-12-23 | 2015-04-01 | 苏州万盛混凝土有限公司 | Low-alkali concrete |
| CN104529336A (en) * | 2014-12-23 | 2015-04-22 | 苏州万盛混凝土有限公司 | Method for preparing low-alkali concrete |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098227C (en) * | 2000-02-15 | 2003-01-08 | 韩永谦 | Multifunctional water-proofing agent for concrete |
| CN1095452C (en) * | 2000-03-15 | 2002-12-04 | 中国人民解放军国防科学技术大学 | Composite concrete liquid |
-
2003
- 2003-11-28 CN CNB2003101059860A patent/CN1296308C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110684A (en) * | 2015-08-31 | 2015-12-02 | 广西路佳道桥勘察设计有限公司 | Concrete and modifier thereof |
| CN106242345A (en) * | 2016-07-19 | 2016-12-21 | 甘肃智通科技工程检测咨询有限公司 | A kind of nanometer base cement modifier |
| CN112028541A (en) * | 2020-09-09 | 2020-12-04 | 江西省建筑材料工业科学研究设计院 | Concrete nano reinforcing modifier and preparation method thereof |
| CN113683337A (en) * | 2021-08-24 | 2021-11-23 | 北京工业大学 | Preparation and use methods of additive for reducing concrete creep |
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| CN1296308C (en) | 2007-01-24 |
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