CN102659370B - Mineral admixture concrete and preparation method thereof - Google Patents
Mineral admixture concrete and preparation method thereof Download PDFInfo
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- CN102659370B CN102659370B CN201210091992.4A CN201210091992A CN102659370B CN 102659370 B CN102659370 B CN 102659370B CN 201210091992 A CN201210091992 A CN 201210091992A CN 102659370 B CN102659370 B CN 102659370B
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Abstract
The invention relates to mineral admixture concrete and a preparation method thereof and belongs to the field of building materials. The preparation method is characterized in that a composite solid exciting agent is utilized to excite potential activity of a mineral admixture and produces a synergistic effect with common cement so that the mineral admixture concrete having strength of C30-C70 and excellent durability such as anti-permeability and frost-resistance and allowing normal setting time is obtained. The composite solid exciting agent can greatly improve the strength and the durability of the mineral admixture concrete. Through replacement of 90 to 95% of cement with a large amount of an industrial waste residue-slag powder-fly ash admixture, a production cost is reduced obviously. The mineral admixture of a cementing agent, a sand aggregate and the composite solid exciting agent is pre-stirred and then is added with mixing water so that the composite solid exciting agent is dispersed uniformly and after addition of the mixing water, the mineral admixture can be fully excited. In construction, the mineral admixture concrete has good workability and no ropiness, can be operated easily, has high strength after setting and hardening, good durability and a low cost, and can be used in various engineering construction and concrete products.
Description
Technical field
The present invention relates to a kind of mineral admixture concrete and preparation method thereof, the mineral admixture concrete for various engineering constructions and concrete product, belongs to material of construction.
Background technology
Concrete is as a kind of traditional material of construction, and along with the increase to its usage quantity, resource, the energy and environmental problem also become increasingly conspicuous.During tradition manufacture of cement, Resources consumption is large, and waste gas, dust discharge amount are large, and environment is caused to serious pollution, therefore, concrete developing direction must be the needs that should meet people from now on, alleviates again the load to global environment, takies less as much as possible resource, reduce energy consumption, reduce waste discharge, thereby meet the requirement of Sustainable development, and environment is coordinated better and meets Mode of Circular.
The production of new concrete should make full use of industrial residue, as slag, flyash etc., uses no or little cement clinker, reduces as far as possible clinker, reduces the carrying capacity of environment in cement production process, realizes the coordination of concrete development and environment.
Slag, flyash equal industrial residue is as the adulterant in cement or concrete.But due to technical reason, the blended material using these adulterants as replacement cement, exists replacement amount low, is generally no more than 50%, and the problem that activity is not high, concrete stability is poor, can not bring into play the performance of these materials completely.Alkali excites industrial residue to compare with portland cement concrete, has the weather resistance of low hydration heat, high early strong, high permeability resistant and various excellences.Utilize alkaline constituents to pass through chemistry and physical method and activate slag, the various industrial residues preparations such as flyash are without the agglutination material of grog, few grog, remove calcination and powder-grinding process repeatedly from, are the effective ways of the Sustainable development of promotion cement and concrete.
At present, excite in the alkali-activator of trade waste the lowest modulus liquid soluble glass, but adopt liquid soluble glass to there is following shortcoming: (1) poor stability, larger to the harm of human and environment, be unfavorable for that transportation stores; (2) the alkali-excited cement concrete mix viscosity of situ production is large, constructs very inconvenient; (3) be difficult to time of coagulation control, in actual concrete application, be easy to occur rapid hardening or not solidifying phenomenon, intensity is difficult to guarantee; (4) easily there is the phenomenon in scum and crack in the concrete condensing.And mainly with NaOH, KOH, be main in the solid exciting agent that stimulation effect is good in early days, NaOH, KOH very easily absorb moisture deliquescence in air, jointly levigate with gelling material, and the hydration reaction of local alkali-gelling material can occur, and cause alkali binding material to lose efficacy very soon.If use solid base metal silicate, because their solubleness in water is little and dissolution rate is very slow, separately slag, flyash are excited and is difficult to be effective, even use the good instant powdery sodium silicate activated slag of solvability, flyash, but because being also difficult to be effective time of coagulation oversize (being greater than 24h).
Summary of the invention
The object of this invention is to provide that a kind of time of coagulation is normal, intensity is high, good endurance, not thickness, constructability, a kind of mineral admixture concrete of with low cost, energy-conserving and environment-protective and preparation method thereof.
Technical solution:
Mineral admixture concrete of the present invention, comprises the weight percent component of following material: adulterant 14～19%, cement 0.6～1.7%, composite solid exciting agent 0.9～1.7%, sand 25～34%, stone 42～50%, water 7～7.6%.
Described adulterant be slag powders and flyash mixture, it forms weight ratio and is: slag powders 50～60%, flyash 40～50%.
Described composite solid exciting agent comprises: sodium hydroxide, sodium carbonate, low modulus liquid soluble glass, properties-correcting agent, its raw material forms weight ratio: sodium hydroxide 10～25%, sodium carbonate 10～25%, low modulus liquid soluble glass (modulus 2.5～2.8, degree Beaume 40～50 degree) 55～65%, properties-correcting agent polyacrylamide or poly-phosphate 0.2～0.5%.In mineral admixture concrete, composite solid exciting agent can provide sufficient OH on the one hand
-ion, improves concrete pH value, and hydration reaction accelerates, and concrete is had to good early strength function, makes on the other hand the slag powders Ca (OH) that aquation produces in basic solution
2further carry out pozzolanic reaction with fly vitreous, guaranteed concrete later strength.Compared with prior art, the composite solid exciting agent adopting in the present invention has overcome the poor stability of conventional solid alkali-activator, the drawback of liquid exciting agent site operation difficulty, alkalescence is strong, good stability in air, processing is simple, with low cost, and it is convenient to use, store, and the excellent in te pins of durability such as remarkable to slag powders, flyash stimulation effect, concrete strength is high, anti-permeability performance and anti-freezing property.
Described cement is ordinary Portland cement, the Ca (OH) that hydrated cementitious generates
2can excite active ingredient in flyash, generate ettringite and C-S-H gel, therefore there is the effect that improves early age strength of concrete and adjust time of coagulation.
Described sand be silt content be not more than 5% in, coarse sand or fine sand, stone is the rubble of 5～20mm or 5～31.5mm continuous grading.Sand, other control indexes of stone are in national standard.
Mineral admixture concrete preparation method of the present invention, comprises the steps:
(1) prepare composite solid exciting agent: raw material is formed by weight: sodium hydroxide 10～25%, sodium carbonate 10～25%, low modulus liquid soluble glass 55～65%, each component of properties-correcting agent polyacrylamide or poly-phosphate 0.2～0.5% mixes, under vacuum condition, ageing is cleared up 24～48 hours, dry at 140～170 ℃, dry after, then carry out grinding to specific surface area and be not less than 300m
2the pressed powder that/kg obtains;
(2) raw material is formed by weight: adulterant 14～19%, cement 0.6～1.7%, composite solid exciting agent 0.9～1.7%, sand 25～34%, each component of stone 42～50% drops into mixing machine, and mix 40s-60s, mixes;
(3) weight ratio forming by raw material in the mixture after step (2) mixes drops into 7～7.6% water again, and mix 60s-90s, stirs, and makes mineral admixture concrete.
It is as concrete consolidating material that the present invention adopts mineral admixture, add composite solid exciting agent to excite mineral admixture lateral reactivity, be equipped with Portland cement acting in conjunction, make that intensity is high, the concrete of the excellent in te pins of durability such as time of coagulation is normal, impermeability and frost resistance.
The present invention, under the acting in conjunction of composite solid exciting agent and ordinary Portland cement, has excited the lateral reactivity of slag powders, flyash in mineral admixture concrete effectively, can make the concrete that label is C30～C70.Compare with same label normal concrete, the present invention is owing to using a large amount of industrial residues to reduce cost, and especially with respect to concrete more than C50, cost can reach 30 yuan/m
3, there is obvious Social benefit and economic benefit.Excite the concrete of preparation to compare with the alkali of current report, uniqueness due to composite solid exciting agent in the present invention, alkalescence property strong, stable in the air is good, the features such as constructability, mineral admixture concrete of the present invention overcome site operation concrete unstable, there is the problems such as scum or crack after condensing, be used in concrete product, be not stained with mould during the demoulding, construction or result of use are good.
Whether what in the present invention, composite solid exciting agent disperseed in mineral admixture concrete is even, and its stimulation effect is had a certain impact.Traditional concrete technology of preparing, once the technology of feeding intake is used in alkali and excites in concrete, and tending to, because exciting agent disperses unevenly to affect stimulation effect, further affects concrete quality, for example there will be the even rapid hardening of a part of concrete coagulation, the quality accident that a part is not solidifying.The preparation method that the present invention adopts is: first the mixture of slag powders, flyash, composite solid exciting agent, cement, sand, stone is dropped into mixing machine, mix is 40s～60s at least, composite solid exciting agent is uniformly dispersed in concrete, in mixture, drop into again water, mix is 60s～90s at least, makes the mineral admixture concrete stirring.Preparation method of the present invention has overcome above-mentioned shortcoming, needs in the preparation the churning time long compared with normal concrete.
Accompanying drawing explanation
Fig. 1 is that mineral admixture concrete test block 28d of the present invention surveys test block picture after ultimate compression strength breakage the length of time;
Fig. 2 is that portland cement concrete test block 28d surveys test block picture after ultimate compression strength breakage the length of time.
Embodiment
The present invention by weight percentage, mineral admixture is 14～18%, comprising 60wt% slag powders and 40wt% flyash, the consumption of composite solid exciting agent is 1.0～1.3%, 425 ordinary Portland cement consumptions are 0.7～0.9%, and sand consumption is that 28～32% sands adopt the medium sand that moduluses are 2.8, silt content is 2%; Stone consumption is the rubble of 45% employing 5-31.5mm continuous grading, and water consumption is 7.2～7.5%;
The raw material of composite solid exciting agent forms weight ratio: sodium hydroxide 25%, modulus is 2.5, degree Beaume is the liquid soluble glass 65% of 46 degree, sodium carbonate 10%, properties-correcting agent polyacrylamide 0.2%, after above-mentioned raw materials fully mixes, under vacuum condition, 36h is cleared up in ageing, dry at 150 ℃, after dry, grinding to specific surface area is 305m
2/ kg makes pressed powder.
Every cubic metre of mineral admixture concrete proportioning is in Table proportioning 1-5 in 1.For contrasting, preparation exciting agent simultaneously, and in the situation that keeping identical water consumption, applied the proportioning of conventional naphthalene water reducer, in Table proportioning 6-10 in 2, in table 2, proportioning 11-13 is respectively C50, C55, C60 portland cement concrete proportioning.Carry out concrete mix time of coagulation, 3d, 7d, 28d, 60d compressive strength test in the length of time, and impervious, the anti-freezing property test of proportioning 3 and proportioning 8 have been carried out in contrast.
Table 1 mineral admixture concrete proportioning kg/m
3
Table 2 common concrete proportioning kg/m
3
In the present invention, the cost of composite solid exciting agent is 2200 yuan/ton of left and right, from table 1 proportioning 1-5 and table 2 proportioning 6-10 contrast, can find out, adopt the mineral admixture concrete of composite solid exciting agent preparation of the present invention, than cost-saving 10～20 yuan/m of portland cement concrete not preparing with composite solid exciting agent of the present invention
3.
Claims (1)
1. a preparation method for mineral admixture concrete, is characterized in that, comprises the steps:
(1) prepare composite solid exciting agent: raw material is formed by weight: sodium hydroxide 10～25%, sodium carbonate 10～25%, modulus 2.5～2.8, the low modulus liquid soluble glass 55～65% of degree Beaume 40～50 degree, properties-correcting agent polyacrylamide or poly-phosphate 0.2～0.5% mix, and under vacuum condition, ageing is cleared up 24～48 hours, dry at 140～170 ℃, after dry, then carry out grinding to specific surface area and be not less than 300m
2the pressed powder that/kg obtains;
(2) raw material is formed by weight: adulterant 14～19%, cement 0.6～1.7%, composite solid exciting agent 0.9～1.7%, silt content be not more than 5% in, coarse sand or fine sand 25～34%, continuous grading 5～20mm or 5～31.5mm rubble 42～50% drop into mixing machine, mix 40s-60s, mixes; Wherein adulterant is the mixture of slag powders and flyash, and its composition weight ratio is: slag powders 50～60%, flyash 40～50%;
(3) weight ratio forming by raw material in the mixture after step (2) mixes drops into 7～7.6% water again, and mix 60s-90s, stirs, and makes mineral admixture concrete.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103964759B (en) * | 2014-03-31 | 2016-05-25 | 安徽鑫润新型材料有限公司 | A kind of seepage control and crack resistance concrete and preparation method thereof |
| CN104030592A (en) * | 2014-07-01 | 2014-09-10 | 把正春 | Method for preparing environment-friendly activation mineral material addition exciting agent of ferrochrome slag |
| CN104177034B (en) * | 2014-09-16 | 2015-12-09 | 福州大学 | Neutral sodium alkali-activated slag haydite concrete and preparation method thereof |
| CN105271972A (en) * | 2015-09-21 | 2016-01-27 | 长沙县三和新型建材有限公司 | Mineral waste admixture hydraulic concrete |
| CN109574609A (en) * | 2019-01-18 | 2019-04-05 | 安徽理工大学 | A method of alkali-activated carbonatite concrete shrinkage cracking is effectively relieved |
| CN111807763A (en) * | 2020-06-10 | 2020-10-23 | 成都宏基建材股份有限公司 | Preparation method of alkali-activated pervious concrete |
| CN115626811A (en) * | 2022-09-05 | 2023-01-20 | 上海建工集团股份有限公司 | Precast concrete of cement-alkali activated aluminosilicate cementing system and preparation method thereof |
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|---|---|---|---|---|
| CN1792968A (en) * | 2005-11-18 | 2006-06-28 | 同济大学 | Light high performance ocean concrete and preparation process thereof |
| CN101514088A (en) * | 2008-02-22 | 2009-08-26 | 陈加耘 | Finely ground high-titanium slag and fly ash composite high-performance concrete |
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2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1792968A (en) * | 2005-11-18 | 2006-06-28 | 同济大学 | Light high performance ocean concrete and preparation process thereof |
| CN101514088A (en) * | 2008-02-22 | 2009-08-26 | 陈加耘 | Finely ground high-titanium slag and fly ash composite high-performance concrete |
Non-Patent Citations (2)
| Title |
|---|
| 《碱激发复合渣体混凝土的试验研究》;张兰芳等;《哈尔滨工业大学学报》;20080430;第40卷(第4期);第640-643页 * |
| 张兰芳等.《碱激发复合渣体混凝土的试验研究》.《哈尔滨工业大学学报》.2008,第40卷(第4期),第640-643页. |
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