CN103073223A - Concrete admixture for inhibiting alkali reactivity of metamorphic rock aggregate and preparation method and application of concrete admixture - Google Patents
Concrete admixture for inhibiting alkali reactivity of metamorphic rock aggregate and preparation method and application of concrete admixture Download PDFInfo
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- CN103073223A CN103073223A CN2013100415999A CN201310041599A CN103073223A CN 103073223 A CN103073223 A CN 103073223A CN 2013100415999 A CN2013100415999 A CN 2013100415999A CN 201310041599 A CN201310041599 A CN 201310041599A CN 103073223 A CN103073223 A CN 103073223A
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Abstract
The invention relates to a concrete admixture for inhibiting the alkali reactivity of a metamorphic rock aggregate. The concrete admixture comprises the following components in percent by weight of 94-99 wt percent of mineral admixtures, 0.1-1.5wt percent of lithium compound, 0.5-3 wt percent of silane and 0.02-4wt percent of air entraining agent. A preparation method of the concrete admixture comprises the steps of: weighing all components according to the proportion, pouring the weighed components in a stirrer, adding the silane, and stirring for 5-10min until uniformly mixing to obtain the concrete admixture. The concrete admixture for inhibiting the alkali reactivity of the metamorphic rock aggregate can be used for preparing metamorphic rock machine-made sand concrete with different strength grades and applications, and is relatively remarkable in inhibition effect of the metamorphic rock concrete alkali aggregate.
Description
Technical field
The present invention relates to a kind of concrete admixture for suppressing metamorphosed rock aggregate basic active and preparation method thereof and application, belong to the long-term weather resistance technology of concrete and building materials field in traffic, bridge, the road engineering.
Background technology
Alkali-aggregate reaction refers in the aggregate (sand, stone) in mineralogical composition that some has basic active and the concrete pore swelling property reaction that occurs between the basic solution (take KOH, NaOH as main) from the solubility of cement, admixture etc., these alkaline solutions may come from this reaction and cause that volume of concrete expands and even cracking, change concrete microstructure, the mechanical properties such as concrete ultimate compression strength, folding strength, Young's modulus are obviously descended, have a strong impact on the safe handling of structure.Because alkali-aggregate reaction generally is to occur gradually after the several years behind the concrete formation, its result causes concrete durability to descend, and also can make concrete lose its use value when serious.And because reaction occurs in whole inside concrete, therefore, the destruction that this reaction causes both had been difficult to prevention, was difficult to again stop, and more difficult repairing and redemption are so be called as concrete cancer.
Common basic active mineral mainly contain magmatite, sedimentogeneous rock and metamorphosed rock.Metamorphosed rock has very widely distribution in China, and there are a large amount of metamorphosed rocks in the 1/6 above area that especially accounts for the complete regional total area in Guizhou, and this rocks fails to be widely used in the concrete because having potential basic active.Guizhou province can only adopt local rock aggregate and Machine-made Sand concrete batching because of the restriction of geographical environment, natural resources.Along with the propelling of China's strategy to develop western regions, the infrastructure project all-round construction such as a large amount of municipal administrations, motorway, high-speed railway need the concrete skeleton material of enormous amount, and consider and must gather materials on the spot from economy, environment equal angles.From The Metamorphic Rock Area sandstone aggregate natural resources lacks more outstanding, adopts metamorphosed rock aggregate concrete batching imperative.
Therefore, the concrete admixture of research inhibition metamorphosed rock aggregate basic active has important practical usage to concrete works security, weather resistance, the reduce project cost that improves From The Metamorphic Rock Area.
Summary of the invention
The object of the present invention is to provide a kind of concrete admixture that suppresses metamorphosed rock aggregate basic active and preparation method thereof so that have the metamorphosed rock of basic active or potential basic active can be in a large number, be widely used among the concrete works.
The present invention is achieved by the following technical solutions:
A kind of concrete admixture that suppresses metamorphosed rock aggregate basic active is comprised of the component of following weight percentage:
Mineral admixture 94-99wt%;
Lithium compound 0.1-1.5wt%;
Silane 0.5-3wt%;
Air entrapment agent 0.02-4wt%;
Preferably, described a kind of concrete admixture that suppresses metamorphosed rock aggregate basic active is comprised of the component of following weight percentage:
Mineral admixture 96.5-99wt%;
Lithium compound 0.1-0.8wt%;
Silane 0.7-2.5wt%;
Air entrapment agent 0.03-3wt%;
Preferably, described mineral admixture is selected from flyash and silicon ash; Described flyash is second class powered coal ash or first level flour coal ash; Described silicon ash is condensed state silicon ash or ordinary silicon ash, specific surface area 〉=190000cm
2/ g.
Preferably, described mineral admixture preferred first level flour coal ash and silicon ash when the preparation strong concrete.
Preferably, described lithium compound is selected from LiOH, LiF and Li
2CO
3
Preferably, described silane is silane powder or silane emulsion.
Preferably, described air entrapment agent is selected alkyl salt air entrapment agent, lignin sulfonate air entrapment agent, rosin tree lipid air entrapment agent or aliphatic alcohols air entrapment agent; Alkyl salt air entrapment agent more preferably.
Preferably, described alkyl salt air entrapment agent is selected from sodium lauryl sulphate and Sodium dodecylbenzene sulfonate.
Preferably, described lignin sulfonate air entrapment agent is selected from calcium lignin sulphonate or sodium lignosulfonate.
Preferably, described rosin tree lipid air entrapment agent is selected from colophonium pyrolytic polymer or rosined soap.
Preferably, described aliphatic alcohols air entrapment agent is selected from sodium alkyl sulfate or high fatty alcohol derivative.
The present invention further discloses described a kind of preparation method who suppresses the concrete admixture of metamorphosed rock aggregate basic active, may further comprise the steps:
(1) takes by weighing each component by proportioning;
(2) load weighted each component is poured in the stirrer, silane adds at last, stirs 5-10 minute to mixing.
A kind of concrete admixture that suppresses metamorphosed rock aggregate basic active of the present invention can be used for the preparation different intensity grades and with the metamorphosed rock machine-made sand concrete of purposes.
According to said method the concrete of preparation is compared with additive method, has the following advantages:
1) preparation method is simple, and inhibition is remarkable.Present method can reduce 14 days rate of expansion 75 ~ 94% of mortar bars effectively, and is quite remarkable to the retarding effect of metamorphosed rock concrete alkali aggregate reaction.
2) take full advantage of trade waste, and can prepare the metamorphosed rock aggregate concrete that satisfies various conditions by optimizing proportioning.Reduce project cost shortens the duration of a project, alleviates carrying capacity of environment.
3) engineering project in rock area can be gathered materials on the spot on the turn, thereby reduces starting material transportation, storage cost and time, also can alleviate the environmental disruption that brings because of raw-material long-distance transport.
Embodiment
Below by specific specific examples technical scheme of the present invention is described.Should be understood that one or more method stepss that the present invention mentions do not repel before and after described combination step also exists the additive method step or can also insert the additive method step between these step of clearly mentioning; Should also be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.And, except as otherwise noted, the numbering of various method steps is only for differentiating the convenient tool of various method steps, but not ordering or the enforceable scope of restriction the present invention for limiting various method steps, the change of its relativeness or adjustment, in the situation without essence change technology contents, when also being considered as the enforceable category of the present invention.
Embodiment 1
Prepare a kind ofly for certain engineering Bridge, roadbed, tunnel, Culvert engineering a kind of concrete admixture that suppresses metamorphosed rock aggregate basic active with C25 metamorphosed rock aggregate machine-made sand concrete, it is as follows to prepare burden:
Second class powered coal ash 97.972wt%;
LiOH 0.160wt%；
Silane powder 0.911wt%;
Sodium lignosulfonate 0.957wt%;
The preparation process of described admixture is: after taking by weighing each component by proportioning, load weighted each component is poured in the stirrer, silane adds at last, stirs 5-10 minute to mixing.
The volume of described admixture in described concrete is the 43wt% of cement weight; Adopt American Society Testing and Materials's standard (ASTM C1260 standard) that described concrete is tested, 14d mortar bars rate of expansion is 0.067%, has reduced by 85.2% than benchmark test specimen (not adding admixture) rate of expansion.
Embodiment 2
Prepare a kind ofly for certain engineering Bridge, roadbed, tunnel, Culvert engineering a kind of concrete admixture that suppresses metamorphosed rock aggregate basic active with C30 metamorphosed rock aggregate machine-made sand concrete, it is as follows to prepare burden:
Second class powered coal ash 97.611wt%;
Li
2CO
3 0.518wt%；
Silane emulsion 1.816wt%;
Rosin soap air-entraining agent 0.055wt%.
The preparation process of described admixture is with embodiment 1.
The volume of described admixture in described concrete is the 21.5wt% of cement weight; Adopt American Society Testing and Materials's standard (ASTM C1260 standard) that described concrete is tested, 14d mortar bars rate of expansion is 0.070%, has reduced by 77.5% than benchmark test specimen (not adding admixture) rate of expansion.
Embodiment 3
Prepare a kind ofly for certain engineering Bridge, roadbed, tunnel, Culvert engineering a kind of concrete admixture that suppresses metamorphosed rock aggregate basic active with C30 metamorphosed rock aggregate machine-made sand concrete, it is as follows to prepare burden:
First level flour coal ash 98.586wt%;
Li
2CO
3 0.233wt%；
Silane powder 1.149wt%;
Sodium lauryl sulphate 0.032wt%.
The preparation process of described admixture is with embodiment 1.
The volume of described admixture in described concrete is the 42.9wt% of cement weight; Adopt American Society Testing and Materials's standard (ASTM C1260 standard) that described concrete is tested, 14d mortar bars rate of expansion is 0.081%, has reduced by 79.8% than benchmark test specimen (not adding admixture) rate of expansion.
Embodiment 4
Prepare a kind ofly for certain engineering Bridge, roadbed, tunnel, Culvert engineering a kind of concrete admixture that suppresses metamorphosed rock aggregate basic active with C40 metamorphosed rock aggregate machine-made sand concrete, it is as follows to prepare burden:
Ordinary silicon ash 97.741wt%;
LiF 0.383wt%；
Silane emulsion 1.762wt%;
Sodium alkyl sulfate 0.114wt%;
The preparation process of described admixture is with embodiment 1.
The volume of described admixture in described concrete is the 33.3wt% of cement weight; Adopt American Society Testing and Materials's standard (ASTM C1260 standard) that described concrete is tested, 14d mortar bars rate of expansion is 0.077%, has reduced by 82% than benchmark test specimen (not adding admixture) rate of expansion.
Claims (9)
1. concrete admixture that suppresses metamorphosed rock aggregate basic active is comprised of the component of following weight percentage:
Mineral admixture 94-99wt%;
Lithium compound 0.1-1.5wt%;
Silane 0.5-3wt%;
Air entrapment agent 0.02-4wt%.
2. concrete admixture as claimed in claim 1 is characterized in that, described mineral admixture is selected from flyash and silicon ash.
3. concrete admixture as claimed in claim 2 is characterized in that, described flyash is second class powered coal ash or first level flour coal ash; Described silicon ash is condensed state silicon ash or ordinary silicon ash, specific surface area 〉=190000cm
2/ g.
4. concrete admixture as claimed in claim 1 is characterized in that, described lithium compound is selected from LiOH, LiF and Li
2CO
3
5. concrete admixture as claimed in claim 1 is characterized in that, described silane is silane powder or silane emulsion.
6. concrete admixture as claimed in claim 1 is characterized in that, described air entrapment agent is selected alkyl salt air entrapment agent, lignin sulfonate air entrapment agent, rosin tree lipid air entrapment agent or aliphatic alcohols air entrapment agent.
7. concrete admixture as claimed in claim 6 is characterized in that, described alkyl salt air entrapment agent is selected from sodium lauryl sulphate and Sodium dodecylbenzene sulfonate; Described lignin sulfonate air entrapment agent is selected from calcium lignin sulphonate or sodium lignosulfonate; Described rosin tree lipid air entrapment agent is selected from colophonium pyrolytic polymer or rosined soap; Described aliphatic alcohols air entrapment agent is selected from sodium alkyl sulfate or high fatty alcohol derivative.
8. such as the preparation method of the described concrete admixture of claim 1-7, may further comprise the steps:
(1) takes by weighing each component by proportioning;
(2) load weighted each component is poured in the stirrer, silane adds at last, stirs 5-10 minute to mixing.
9. concrete admixture is used for the purposes of the metamorphosed rock machine-made sand concrete of preparation different intensity grades and purposes as described in arbitrary such as claim 1-7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939502A (en) * | 2021-03-09 | 2021-06-11 | 贵州宏信创达工程检测咨询有限公司 | Concrete alkali-aggregate reaction inhibitor based on industrial solid waste material and concrete |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584085A (en) * | 2012-03-05 | 2012-07-18 | 刘福战 | Special additive for inhibiting concrete alkali-aggregate reaction |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584085A (en) * | 2012-03-05 | 2012-07-18 | 刘福战 | Special additive for inhibiting concrete alkali-aggregate reaction |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939502A (en) * | 2021-03-09 | 2021-06-11 | 贵州宏信创达工程检测咨询有限公司 | Concrete alkali-aggregate reaction inhibitor based on industrial solid waste material and concrete |
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Application publication date: 20130501 |