CN102515606A - Concrete admixture capable of inhibiting alkali-silica reaction - Google Patents

Abstract

The invention discloses a concrete admixture capable of inhibiting an alkali-silica reaction. The concrete admixture comprises the following components in mass ratio: 20-90 of spherical superfine inorganic industrial waste with high glass content, 0-60 of crystal aluminum hydroxide and 10-70 of inorganic industrial waste silicon ash with high amorphous SiO2 content. The mixing amount of the concrete admixture is 10-30% of the total mass of cementing materials. The spherical superfine inorganic industrial waste with high glass content has the glass content of at least 95%, the granularity characteristic parameter of at most 1.0mum and the physical and chemical factor Ipc of at least 1.20*10<7> calculated according to a formula. The crystal aluminum hydroxide is of an industrial grade and has the Al2O3 content of at least 63.5% and the fineness of 180-6000mu. The inorganic industrial waste silicon ash with high amorphous SiO2 content has the SiO2 content of at least 85%. By using the concrete admixture, damage by alkali-silica reaction of concrete is effectively inhibited under the condition of lower mixing amount which is less than 30%, the viscosity of the concrete is reduced, and the hydration heat of the concrete is not increased.

Description

The concrete admixture that can suppress alkali-silica reaction

Technical field

The invention belongs to the cement concrete material field; The alkali-aggregate reaction that relates to cement concrete material suppresses material; More specifically suppress, especially adopt the concrete of the higher aggregate preparation of basic active, and its adulterant consumption is when receiving the restriction in relevant specification or shipment distance, source to alkali-silica reaction; When perhaps the adding of silicon ash has a negative impact to other performances of concrete, a kind of concrete admixture that suppresses alkali-silica reaction that provides.

Background technology

The concrete alkali aggregate reaction is meant that the water soluble alkali (potassium, sodium) in cement, admixture, mineral admixture and the mixing water in the concrete is dissolved in the concrete pore liquid; With can produce internal stress with a kind of concrete that makes that the activeconstituents of alkali reaction takes place gradually in the aggregate after concrete hardening, be prone to cause the physical-chemical reaction of harm such as concrete works swelling cracking.Alkali-aggregate reaction has two types: alkali-silica reaction and alkali-carbonate reaction, the former is more common.Alkali-silica reaction is meant in alkali and the aggregate in the concrete and contains a kind of chemical reaction between the active silica class mineral; The resultant alkali silicon gel water-swelling of this reaction can cause concrete structure to damage.

Alkali-aggregate reaction has worldwide caused the destruction and the enormous economic loss of a large amount of concrete workses as one of major reason that causes concrete durability to descend.

The braking measure of alkali-aggregate reaction mainly comprises chemical admixtures such as the alkali content that reduces in inert aggregate consumption, the control concrete, Adding Mineral Admixtures, admixture lithium salts.

Under the difficult situation about obtaining of restriction, inert aggregate that aggregate is originated; Except the alkali content of control in the concrete, using mineral admixture (flyash, silicon ash, slag, zeolite powder, metakaolin etc.) is the practicality of prevention concrete alkali aggregate reaction destructive, economy and valid approach.

But, in geographic Hydraulic and Hydro-Power Engineerings such as Southwest China, northwest, run into the basic active condition with higher of aggregate in recent years.When adopting adulterant to suppress the alkali-aggregate reaction disease of the high-alkali reactive aggregate of this type, have that the flyash haul distance is far away excessively, doping quantity of fly ash receives other performance restriction of concrete and relevant specification restriction, the grey volume of silicon receive problems such as concrete construction workability and hydration heat restriction.

For example, in the hydroelectric development of Yalongjiang River basin, run into a kind of typical pelitic siltstone aggregate.When adopting in ASTM C 1260 or the DL/T 5151-2002 standards such as " concrete for hydraulic structure sandstone aggregate testing regulations " basic active of this aggregate of mortar bars rapid method test that in 80 ℃, 1M concentration NaOH solution, soaks 14 days; The rate of expansion in the 14 day length of time is up to 0.311%; And according to related standards, >=0.20% promptly thinks and has potential basic active; When adopting the basic active of 38 ℃ of these aggregates of concrete prism method test in the DL/T 5151-2002 standards such as " concrete for hydraulic structure sandstone aggregate testing regulations "; The rate of expansion of 1 age period is up to 0.177%; And according to related standards, >=0.04% promptly thinks and has potential basic active; Test specimen ftractures during the length of time at 90d.

For such high reactivity aggregate, according to (Proceedings of the 12 such as Fournier ^ThInt.Conf.Alkali-Aggregate Reaction in Concrete:Mingshu Tang, Min Deng (Eds.), V.1; International Academic Publishers/World Publishing Corp; Beijing, China, 2004; Pp.528-537.) the atmospheric exposure test result who does in Canadian Ottawa; Need very high flyash or silicon ash volume: higher when the basic active of aggregate, for example, 2 years rate of expansion of 38 ℃ of concrete prism methods of straight cement concrete test block reach at 0.338% o'clock; Even the ordinary fly ash of admixture 30% or 10% silicon ash, also be not enough to rate of expansion be reduced to 0.04% this below safety limit.1 year rate of expansion of the pelitic siltstone aggregate in above-mentioned Yalongjiang River basin can reach 2 years rate of expansion over half of the aggregates of testing such as Fournier, needs higher flyash or silicon ash volume.

The volume of flyash and silicon ash is too high all can to produce some negative impacts.Doping quantity of fly ash is too high, and concrete early strength is not enough, carbonization obviously increases, the later stage density is also not enough, therefore; The design construction standard of industries such as building, water conservancy, traffic all has clear and definite restriction for doping quantity of fly ash; For example, regulation is used concrete for hydraulic structure for the skeleton construction in the permanent building among the DL/T 5055-2007 " concrete for hydraulic structure is mixed the flyash technical specifications "; When adopting ordinary portland cement, F class doping quantity of fly ash wherein answers≤30%.

The silicon ash has good inhibition effect to alkali-silica reaction, but the volume of silicon ash surpasses at 5% o'clock, and concrete viscosity will increase, and workability descends, to the obvious effect of construction speed; And because silicon ash active higher, hydration heat is bigger, and spontaneous contraction is bigger, brings concrete crack problem easily.There are negative view in many construction, design and unit in charge of construction to the silicon ash.

And many Hydraulic and Hydro-Power Engineerings are far away apart from the haul distance in the flyash place of production.Power station with Yalongjiang River basin middle and upper reaches is an example, surpasses 500km apart from flyash place of production haul distance, and freight charges increase greatly, even the explant price of flyash surpassed the price that adopts local cement after adding freight charges, and this has also limited doping quantity of fly ash.

Among the patent CN200510039176.9 " multifunctional chlorine-free alkali-free compound concrete slag admixture and working method thereof "; The adulterant that is adopted is main with lithium ground-slag, inferior calcium ground-slag, fluorite mine tailing, silicon ash mainly; Required volume accounts for 30～50% of binder total amount in the concrete, and this belongs to very high volume.Though its do not explain the basic active scope of suitable aggregate; But the rate of expansion deducibility that provides according to embodiment; Subjects among the embodiment is that 14 days mortar bars method rate of expansion are 0.28% basic active aggregate; And according to related standards (like ASTM C1260, DL/T 5151 etc.) criterion---14 days mortar bars method rate of expansion >=0.20% are regarded as potential basic active, this aggregate belongs to the aggregate of typical basic active degree.Do not provide the inhibition effect of 38 ℃ of concrete prism methods in its specification sheets.

Patent CN200710187838.6 " a kind of composition and method of making the same that is used to suppress concrete alkali aggregate reaction " adopts aluminium salt, lithium salts, barium salt, calcium magnesium salts as staple; Though its volume lower (cement quality 6%～8%), embodiment has only provided the inhibition effect for common reactive aggregate.Though embodiment do not explain the basic active scope of suitable aggregate; But reduce figureofmerit and rate of expansion index inverse according to its rate of expansion; The mortar expansion rate that can know the basic active aggregate that is directed against is 0.20%; And according to related standards (like ASTM C1260, DL/T 5151 etc.) criterion---14 days mortar bars method rate of expansion >=0.20% are regarded as potential basic active, this aggregate just just in time is rated as has potential basic active.Simultaneously, because wherein preferred an alkali metal salt or alkaline earth salt are this expensive component of lithium salts, and wherein the lithium salts ratio accounts for 10～30%, and its material cost is with higher.Do not provide the inhibition effect of 38 ℃ of concrete prism methods in its specification sheets.

Patent CN200510104259.1 " concrete admixture and the preparation technology that suppress alkali-aggregate reaction " adopts the modified zeolite powder that has adsorbed H+ to suppress alkali-silica reaction, and it recommends volume to be 5%, and is lower.Though embodiment do not explain the basic active scope of suitable aggregate; But reduce the per-cent inverse according to its 14 days mortar bars rate of expansion test values with than the benchmark test specimen; Can know that adopting broken glass is 0.29% as the rate of expansion of the benchmark test specimen of aggregate; And according to related standards (like ASTM C1260, DL/T 5151-2001 etc.) criterion---14 days mortar bars method rate of expansion >=0.20% are regarded as potential basic active, this aggregate belongs to the aggregate of typical basic active degree.Do not provide the inhibition effect of 38 ℃ of concrete prism methods in its specification sheets.

The related inhibition material of above-mentioned patent is suppressing also there is limitation on the measure of merit selection of Evaluation Method except having the limited limitation of the aggregate basic active degree that is directed against.The main inhibition effect that adopts 80 ℃ of quick mortar bars methods evaluation adulterants to alkali-silica reaction in existing patent and the document.This method is soaked 14d～28d with test specimen in 80 ℃, the NaOH solution of 1M concentration; According to admixture the rate of expansion compared with blank test specimen of the test specimen of adulterant reduce per-cent; Estimate the inhibition effect of adulterant, see standard both at home and abroad such as ASTM C1567 and DL/T 5150-2001 for details.The paper of on " Chinese science " 2011 the 12nd phases (supplementary issue), delivering according to Cai Yue ripple and Ding Jiantong etc.; When adopting this method to estimate essential mineral such as flyash to consist of Vitrea adulterant; No matter the active height of vitreum self; Used high temperature high alkali environment will cause whole vitreums and most of quartz, part mullite crystalline state mineral and alkali reaction, and the level of activity of adulterant is excited greatly, and the ability that suppresses alkali-silica reaction is by exaggerative; And actual concrete structure is under normal temperature, low alkali environment, adulterant suppress alkali-silica reaction effect and Vitrea self activity much relations are arranged.Therefore, 80 ℃ of quick mortar bars methods have been over-evaluated the inhibition effect of the adulterant of flyash and so on to alkali-silica reaction, and its rate of expansion that records reduces per-cent and be far longer than the test result that employing more meets 38 ℃ of concrete prism methods of actual condition.

In other words; For essential mineral consists of 52%～89% Vitrea ordinary fly ash; Article attitude mineral such as wherein contained quartz, mullite, magnetite etc. are difficult to reaction and consume alkali under the low alkali environment of normal temperature, suppress can be considered invalid components for alkali-aggregate reaction.

Big quantity research shows that the fineness of ordinary fly ash suppresses effect to its alkali-silica reaction has certain influence.Fineness can tail over 45 μ m, specific surface area, particle median size (volume average particle size D (4,3) commonly used or surface-area median size D (3,2)), particle median diameter D ₅₀Deng measurement.The particle median diameter D of ordinary fly ash ₅₀Generally greater than 10 μ m.

Through levigate ordinary fly ash or adopt the median size of the superfined flyash that conventional selection by winnowing mode obtains generally (to see symbol national power etc., " Xi'an University of Architecture and Technology's journal (natural science edition) ",, the 3rd phase in 2011 in several micron levels; Zhou Shiqiong etc., " railway science and engineering journal ", 2004 the 2nd phases; Pan Ganghua etc., " concrete ", 1996 the 3rd phases), and simultaneously some coarse particless are pulverized into irregularly shapedly in the levigate process, there were significant differences for the spherical ultra-fine inorganic industrial waste of its physicochemical characteristic and high vitreum content.Still contain more crystalline phase mineral (Zhou Shiqiong etc., " railway science and engineering journal ", 2004 the 2nd phases) in the flyash that obtains like this.Oblige to give birth to and wait (" flyash ", 2010 the 5th phases) used sorting superfined flyash particle major part to be spherical, but median size still there are 2.8 μ m, its mineral composition unknown characteristic.

Build the paper of red grade on " material of construction journal " (2010 the 4th phases) according to fourth, physical and chemical factor of flyash (seeing formula 1) and the inhibition effect height correlation of flyash to alkali-silica reaction.

The physical and chemical factor of flyash:

$C=\frac{0.0467\mathrm{Si}{O}_2-0.0751O_3+0.4064{\mathrm{Fe}}_2{O}_3}{\mathrm{CaO}+1.0997R_{2}O-1.7050\mathrm{MgO}-1.8916{\mathrm{SO}}_3}\&CenterDot;{\mathrm{SSA}}^{2.7112}$ Formula (1);

In the formula, CaO, R ₂O (be the equivalent alkali content ,=Na ₂O+0.658K ₂O), MgO, SO ₃, SiO ₂, Al ₂O ₃, Fe ₂O ₃Be respectively the mass percent of each chemical ingredients of flyash; SSA is that (unit is m for the specific surface area of flyash ²/ kg), and the size distribution that adopts the laser particle analyzer test to obtain, it is spherical to suppose that fly ash grain is, and calculates.

According to (the tenth national cement and chemistry of concrete and utilisation technology meeting paper summary collection such as Liu Zhi brightness and Lan Xianghui; 2007), (the national high performance concrete of the low carbon technique international Conference of concrete and the 9th scientific seminar such as Feng Xiaoxin and Hu Chenguang; 2010) research, analytical pure Al (OH) ₃Alkali-silica reaction is had certain inhibition effect, and it is better that especially long-term (the longest 72d) suppresses effect.But according to their test, analytical pure Al (OH) ₃Volume all was not enough to the mortar bars rapid method 28d rate of expansion of high-alkali reactive aggregate is reduced to below 0.1% at 10% o'clock; Its volume needs about 20% just enough.The result of the testing method of this approaching more reality of concrete prism method all is not provided in their paper.

For the problems referred to above, existing technology still can not provide a kind of cost-effective solution.

Summary of the invention

The purpose of this invention is to provide a kind of concrete admixture that suppresses alkali-silica reaction; The present invention is directed to adopt the higher aggregate preparation of basic active have a possible concrete of alkali-silica reaction; And when its adulterant consumption receives the restriction in relevant specification or shipment distance, source; When perhaps the adding of silicon ash has a negative impact to other performances of concrete; Below 30% than effectively suppressing its alkali-silica reaction disease under the low-dosage, and reduce concrete viscosity, improve concrete splitting resistance simultaneously.

Technical scheme of the present invention is: a kind of concrete admixture that suppresses alkali-silica reaction, its constituent mass ratio is: the spherical ultra-fine inorganic industrial waste 20～90 of high vitreum content, crystalline state white lake 0～60, high amorphous Si O ₂The inorganic industrial waste silicon ash 10～70 of content.The volume of this adulterant is 10%～30% of a gelling material total mass.

More optimize with more particularly, among the present invention:

The described concrete admixture that suppresses alkali-silica reaction, vitreum content>=95% in the spherical ultra-fine inorganic industrial waste of said high vitreum content, and its grain size characteristic parameter D ₅₀≤1.0 μ m, and its physical and chemical factor I that adopts formula 1 to calculate _Pc>=1.20 * 10 ⁷:

The physical and chemical factor calculating formula:

$\mathrm{Ipc}=\frac{0.0467\mathrm{Si}{O}_2-0.0751O_3+0.4064{\mathrm{Fe}}_2{O}_3}{\mathrm{CaO}+1.0997R_{2}O-1.7050\mathrm{MgO}-1.8916{\mathrm{SO}}_3}\&CenterDot;{\mathrm{SSA}}^{2.7112}$ Formula (1);

In the formula, CaO, R ₂O (be the equivalent alkali content ,=Na ₂O+0.658K ₂O), MgO, SO ₃, SiO ₂, Al ₂O ₃, Fe ₂O ₃Be respectively the mass percent of each chemical ingredients; SSA is that (unit is m to specific surface area ²/ kg), and the size distribution that adopts the laser particle analyzer test to obtain, it is spherical to suppose that particle is, and calculates.

High vitreum content means that the crystalline state mineral that wherein are difficult to react are less; Particle diameter is thinner, and reactive behavior is also higher; When physical and chemical factor was big, the active chemical content that wherein helps suppressing alkali-silica reaction was higher.The inorganic industrial waste that satisfies this requirement is not used to suppress before alkali-silica reaction as yet.Applicant's test shows that it has the inhibition effect that surpasss the expectation to alkali-silica reaction.

Collect flue when the spherical ultra-fine inorganic industrial waste of said high vitreum content can adopt special dust arrester installation to burn paper-mill sludge or municipal sludge from using fluidized-bed or circulating fluidized bed; Or from the flyash discharging flue in fuel-burning power plant, collect; Or from ordinary fly ash, adopt special sorting unit to collect; Or adopt that coal gangue is levigate, the burning back adopts special dust arrester installation to collect its flue dust, or adopt flotation process that ordinary fly ash is taken off sorting in high dispersive superfine powder sorting equipment after the charcoal drying.

Said crystalline state white lake is technical grade, its Al ₂O ₃Content>=63.5%, its fineness are 180 orders～6000 orders.The order number more hour, particle is thicker, it is relatively poor to suppress effect.This white lake can adopt three trade mark AH-1, AH-2, the AH-3 that meets GBT 4294-1997 " white lake " standard-required, preferred AH-1.Applicant's test shows; Amorphous hydroted alumina is superior to crystalline state white lake for the short-term inhibition effect of alkali-silica reaction; But the long term inhibition effect is obviously not as crystalline state white lake; And amorphous hydroted alumina has blood coagulation enhancing effect to cement concrete, is not suitable for the concrete of conventional pouring construction.

Said high amorphous Si O ₂The SiO of the inorganic industrial waste silicon ash (claiming silica flour again) of content ₂Content>=85.0%, preferred content>=92%, more preferably content>=95%; Equivalent alkali content≤1.50%, preferred≤1.00%; All the other performances satisfy the requirement of GB/T18736-2002 " mineral admixture for high-strength high-performance concrete ".This silicon ash can be selected the sub product of producing 50% ferro-silicon, 75% ferro-silicon or 98% Pure Silicon Metal for use, preferably adopts the sub product of 75% ferro-silicon or 98% Pure Silicon Metal, more preferably adopts the sub product of 98% Pure Silicon Metal.The silicon ash of encrypting or not encrypting all can adopt, but the tap density of encryption silicon ash is less, more convenient transportation and use.

In adulterant of the present invention, the mass ratio of the spherical ultra-fine inorganic industrial waste of said high vitreum content is 20～90, and the mass ratio of said crystalline state white lake is 0～60, said high amorphous Si O ₂The mass ratio of the inorganic industrial waste silicon ash of content is 10～70, and said adulterant adopts the chemokines I of formula 2 calculating _c>=5.0, preferred>=15.0, more preferably>=20.0.

$\mathrm{Ic}=\frac{0.7928{\mathrm{SiO}}_2+0.5673{\mathrm{Al}}_2{O}_3-2.1705{\mathrm{Fe}}_2{O}_3}{\mathrm{CaO}+0.7356R_{2}O+1.4607\mathrm{MgO}-1.8299{\mathrm{SO}}_3}---\left(2\right);$

Chemokines I _cWhen big, the active chemical content that wherein helps suppressing alkali-silica reaction is higher.The applicant has obtained the chemokines I of adulterant through a large amount of tests _cAnd it suppresses the dependency between the effect to alkali-silica reaction.

The described volume that suppresses the concrete admixture of alkali-silica reaction is 10%～30% of a gelling material total mass.Aggregate for basic active lower (mortar bars rapid method 14d rate of expansion is between 0.100～0.19%) can adopt 10%～15% volume; Aggregate for high (mortar bars rapid method 14d rate of expansion is between 0.20～0.29%) in the basic active can adopt 15%～20% volume; Aggregate for basic active higher (mortar bars rapid method 14d rate of expansion >=0.30%) should adopt the volume between 20%～30%.

Behind the described concrete admixture admixture that suppresses alkali-silica reaction; Owing to wherein contain the spherical ultra-fine inorganic industrial waste of 20%～90% high vitreum content; This component can play good filling effect, ball effect; Therefore, compare, can reduce concrete viscosity with the concrete of single mixing silica; And; Though contain 10%～70% silicon ash in this adulterant; But totally still have certain water-reducing effect, when using with the water reducer combination---this is conventional way, and its mortar water-reducing rate is compared with the result of independent admixture water reducer; Test according to GB 8077-2000 " Methods for testing uniformity of concrete admixture "; Absolute value can further improve 1%～10%, thereby correspondingly reduces concrete water amount and binder total amount, the linear positive correlation of the reduction amplitude of water consumption and binder total amount and the volume of affiliated adulterant.Be accompanied by the reduction of binder total amount, also will bring hydration heat of concrete reduction, contraction minimizing, concrete anticracking property improvement, gelling material to bring the combined effects such as total alkali content reduction in the concrete into.

Advantage of the present invention:

The alkali-aggregate reaction that (1) can effectively suppress to adopt the active higher aggregate of alkali-silica to cause.Can suppress alkali-silica reaction according to the reactive aggregate of the test of the mortar bars rapid method in related standards gained 14d rate of expansion >=0.20%.And when adopting 80 ℃ of mortar bars rapid methods and 38 ℃ of concrete prism methods to test adulterant of the present invention to the inhibition effect of alkali-silica reaction, the inhibition efficiency ratio of gained is more approaching.

(2) required volume is lower, accounts for ratio≤30% of gelling material total mass.

(3) can reduce concrete viscosity.And can the mortar water-reducing rate further be improved 1%～10%, and corresponding reduction concrete water amount and binder total amount, thus concrete hydration heat reduced, reduce and shrink, improve cracking of reinforced concrete, reduce gelling material and bring the total alkali content in the concrete into.

Embodiment

Embodiment 1:

The mass ratio of each component is in the adulterant:

Vitreum content 95%, D ₅₀=558nm, physical and chemical factor I _Pc=3.9 * 10 ⁷Spherical ultra-fine inorganic industrial waste: 50 parts

Crystalline state white lake: 0 part;

Amorphous Si O ₂Content 92%, equivalent alkali content 1.14%, all the other performances satisfy the inorganic industrial waste silicon ash of the requirement of GB/T 18736-2002 " mineral admixture for high-strength high-performance concrete ": 50 parts;

The chemokines I of adulterant _c=7.3;

Adopt certain power station pelitic siltstone basic active aggregate of Southwest China area.This aggregate soaks the rate of expansion in the 14 day length of time according to the mortar bars rapid method in the DL/T 5151-2002 standards such as " concrete for hydraulic structure sandstone aggregate testing regulations " in 80 ℃, 1M concentration NaOH solution be 0.311%, is 0.177% according to the concrete prism method in the DL/T 5151-2002 standards such as " concrete for hydraulic structure sandstone aggregate testing regulations " in the rate of expansion of 38 ℃ of following maintenance 1 age periods.

Adulterant volume 25% time, 2 years rate of expansion 0.037% of 0.098%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method can effectively suppress the alkali-silica reaction disease of this aggregate.

Embodiment 2:

The mass ratio of each component is in the adulterant:

Vitreum content 98%, D ₅₀=325nm, physical and chemical factor I _Pc=6.4 * 10 ⁷Spherical ultra-fine inorganic industrial waste: 33 parts;

1000 order crystalline state white lakes (trade mark AH1) of alumina content 65.4%: 33 parts;

Amorphous Si O ₂Content 92%, equivalent alkali content 1.14%, all the other performances satisfy the inorganic industrial waste silicon ash of the requirement of GB/T 18736-2002 " mineral admixture for high-strength high-performance concrete ": 34 parts;

The chemokines I of adulterant _c=15.2;

Adopt the basic active aggregate identical with embodiment 1.

Adulterant volume 20% time, 2 years rate of expansion 0.035% of 0.076%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method can effectively suppress the alkali-silica reaction disease of this aggregate, and volume are superior to embodiment 1.

Embodiment 3:

The mass ratio of each component is in the adulterant:

Vitreum content 98%, D ₅₀=325nm, physical and chemical factor I _Pc=6.4 * 10 ⁷Spherical ultra-fine inorganic industrial waste: 20 parts;

6000 order crystalline state white lakes (trade mark AH1) of alumina content 65.4%: 40 parts;

Amorphous Si O ₂Content 96%, equivalent alkali content 0.33%, all the other performances satisfy the inorganic industrial waste silicon ash of the requirement of GB/T 18736-2002 " mineral admixture for high-strength high-performance concrete ": 40 parts;

The chemokines I of adulterant _c=21.1;

Adopt the basic active aggregate identical with embodiment 1.

Adulterant volume 20% time, 2 years rate of expansion 0.027% of 0.050%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method can effectively suppress the alkali-silica reaction disease of this aggregate, and suppress effect and be superior to embodiment 2.

Embodiment 4

The mass ratio of each component is in the adulterant:

Vitreum content 95%, D ₅₀=558nm, physical and chemical factor I _Pc=3.9 * 10 ⁷Spherical ultra-fine inorganic industrial waste: 20 parts

3000 order crystalline state white lakes (trade mark AH3) of alumina content 63.7%: 60 parts;

Amorphous Si O ₂Content 92%, equivalent alkali content 1.14%, all the other performances satisfy the inorganic industrial waste silicon ash of the requirement of GB/T 18736-2002 " mineral admixture for high-strength high-performance concrete ": 20 parts;

The chemokines I of adulterant _c=25.9;

Adopt the basic active aggregate identical with embodiment 1.

Adulterant volume 15% time, 2 years rate of expansion 0.021% of 0.065%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method can effectively suppress the alkali-silica reaction disease of this aggregate, and volume are superior to embodiment 3.

Embodiment 5

The mass ratio of each component is in the adulterant:

Vitreum content 98%, D ₅₀=325nm, physical and chemical factor I _Pc=6.4 * 10 ⁷Spherical ultra-fine inorganic industrial waste: 90 parts

Crystalline state white lake: 0 part;

Amorphous Si O ₂Content 98%, equivalent alkali content 0.98%, all the other performances satisfy the inorganic industrial waste silicon ash of the requirement of GB/T 18736-2002 " mineral admixture for high-strength high-performance concrete ": 10 parts;

The chemokines I of adulterant _c=6.8;

Adulterant volume 30% time, 2 years rate of expansion 0.033% of 0.038%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method can effectively suppress the alkali-silica reaction disease of this aggregate.

Embodiment 6

The mass ratio of each component is in the adulterant:

Vitreum content 98%, D ₅₀=325nm, physical and chemical factor I _Pc=6.4 * 10 ⁷Spherical ultra-fine inorganic industrial waste: 20 parts

180 order crystalline state white lakes (trade mark AH3) of alumina content 63.7%: 10 parts;

Amorphous Si O ₂Content 85%, equivalent alkali content 1.02%, all the other performances satisfy the inorganic industrial waste silicon ash of GB/T 18736-2002 " mineral admixture for high-strength high-performance concrete ": 70 parts;

The chemokines I of adulterant _c=15.5;

Adulterant volume 10% time, 2 years rate of expansion 0.036% of 0.026%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method can effectively suppress the alkali-silica reaction disease of this aggregate, and volume are superior to embodiment 3.

Comparative Examples 1:

Vitreum content 53%, D ₅₀=27.3 μ m, physical and chemical factor I _Pc=3.0 * 10 ⁶Common I level flyash: 100 parts;

The chemokines I of this flyash _c=7.9;

Adopt the basic active aggregate identical with embodiment 1.

This doping quantity of fly ash 20% time, 2 years rate of expansion 0.076% of 0.109%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method.The result of comprehensive two kinds of methods judges based on the regulation of DL/T 5241-2010 " hydroconcrete durability technical specification ", can not effectively suppress the alkali-silica reaction disease of this aggregate.

Comparative Examples 2:

Vitreum content 53%, D ₅₀=27.3 μ m, physical and chemical factor I _Pc=3.0 * 10 ⁶Common I level flyash: 100 parts;

The chemokines I of this flyash _c=7.9;

Adopt the basic active aggregate identical with embodiment 1.

This doping quantity of fly ash 30% time, 2 years rate of expansion 0.050% of 0.048%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method.The result of comprehensive two kinds of methods; Regulation according to DL/T 5241-2010 " hydroconcrete durability technical specifications " is judged; The alkali-silica reaction disease that can not effectively suppress this aggregate, and doping quantity of fly ash has surpassed DL/T 5055-2007 " concrete for hydraulic structure is mixed the flyash technical specifications " to the concrete maximum doping quantity restriction of anti scuffing (25%).

Comparative Examples 3:

SiO ₂The inorganic industrial waste silicon ash of content 92%: 100 parts;

Adopt the basic active aggregate identical with embodiment 1.

Silicon ash volume 8% time, 2 years rate of expansion 0.049% of 0.062%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method.The result of comprehensive two kinds of methods judges based on the regulation of DL/T 5241-2010 " hydroconcrete durability technical specification ", can not effectively suppress the alkali-silica reaction disease of this aggregate.

And receive the restriction of cracking of reinforced concrete and workability, higher silicon ash volume is reluctant to adopt by design and unit in charge of construction.

Comparative Examples 4:

Vitreum content 53%, D ₅₀=27.3 μ m, physical and chemical factor I _Pc=3.0 * 10 ⁶Common I level flyash: 80 parts;

SiO ₂The inorganic industrial waste silicon ash of content 92%: 20 parts;

The chemokines I of this composite blend _c=9.3;

Adopt the basic active aggregate identical with embodiment 1.

This composite blend volume 25% time, 2 years rate of expansion 0.044% of 0.030%, 38 ℃ of concrete prism of mortar bars rapid method 28d rate of expansion method.The result of comprehensive two kinds of methods judges based on the regulation of DL/T 5241-2010 " hydroconcrete durability technical specification ", can not effectively suppress the alkali-silica reaction disease of this aggregate.

Claims (8)

1. the concrete admixture that can suppress alkali-silica reaction is characterized in that, the mass ratio of this each component of concrete admixture is: the spherical ultra-fine inorganic industrial waste 20～90 of high vitreum content, crystalline state white lake 0～60, high amorphous Si O ₂The inorganic industrial waste silicon ash 10～70 of content.

2. the concrete admixture that suppresses alkali-silica reaction according to claim 1 is characterized in that this adulterant counts gelling material, and its volume is 10%～30% of a gelling material total mass.

3. the concrete admixture that suppresses alkali-silica reaction according to claim 1 is characterized in that, vitreum content >=95% of the spherical ultra-fine inorganic industrial waste of said high vitreum content.

4. the concrete admixture that suppresses alkali-silica reaction according to claim 1 is characterized in that, the grain size characteristic parameter D of the spherical ultra-fine inorganic industrial waste of said high vitreum content ₅₀≤1.0 μ m.

5. the concrete admixture that suppresses alkali-silica reaction according to claim 1 is characterized in that, the physical and chemical factor I that the spherical ultra-fine inorganic industrial waste of said high vitreum content adopts formula 1 to calculate _Pc>=1.20 * 10 ⁷:

The physical and chemical factor calculating formula:

$\mathrm{Ipc}=\frac{0.0467\mathrm{Si}{O}_2-0.0751O_3+0.4064{\mathrm{Fe}}_2{O}_3}{\mathrm{CaO}+1.0997R_{2}O-1.7050\mathrm{MgO}-1.8916{\mathrm{SO}}_3}\&CenterDot;{\mathrm{SSA}}^{2.7112}$ Formula (1);

In the formula, CaO, R ₂O, MgO, SO ₃, SiO ₂, Al ₂O ₃, Fe ₂O ₃Be respectively the mass percent of each chemical ingredients; SSA is a specific surface area, the size distribution that adopts the laser particle analyzer test to obtain, and it is spherical to suppose that particle is, and calculates.

6. the concrete admixture that suppresses alkali-silica reaction according to claim 1 is characterized in that, said crystalline state white lake is technical grade, its Al ₂O ₃Content>=63.5%, its fineness are 180 orders～6000 orders.

7. the concrete admixture that suppresses alkali-silica reaction according to claim 1 is characterized in that, said high amorphous Si O ₂The SiO of the inorganic industrial waste silicon ash of content ₂Content>=85.0%, equivalent alkali content≤1.50%, all the other performances satisfy the requirement of GB/T18736-2002 " mineral admixture for high-strength high-performance concrete ".

8. according to the described concrete admixture that suppresses alkali-silica reaction of one of claim 1-9; It is characterized in that; The mass ratio of the spherical ultra-fine inorganic industrial waste of said high vitreum content is 20～90, and the mass ratio of said crystalline state white lake is 0～60, said high amorphous Si O ₂The mass ratio of the inorganic industrial waste silicon ash of content is 10～70, and said adulterant adopts chemokines>=5.0 of formula 2 calculating:

$C_{\mathrm{FA}}=\frac{0.7928{\mathrm{SiO}}_2+0.5673{\mathrm{Al}}_2{O}_3-2.1705{\mathrm{Fe}}_2{O}_3}{\mathrm{CaO}+0.7356R_{2}O+1.4607\mathrm{MgO}-1.8299{\mathrm{SO}}_3}---\left(2\right).$