CN101514982A - Method for evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate - Google Patents
Method for evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate Download PDFInfo
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Abstract
A method for evaluating effectiveness of a measure for inhibiting alkali-silica active reaction of concrete aggregate comprises the following steps: using active aggregate used in actual works and low-alkali cement with available alkali Na2O content less than or equal to 0.60% or high-alkali cement with available alkali Na2O content of 0.90%+/-0.1% to form mortar test pieces by mixing fly ash, and determining an inhibition measure effective where low-alkali cement mortar test pieces are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.040%, and determining the inhibition measure effective where high-alkali cement mortar test pieces mixed with the fly ash are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.050%. Thus, the method can help quickly determine the expansion rate of the mortar test pieces formed with the active aggregate used in actual works, and verify and evaluate the effectiveness of the measure for inhibiting the reaction of the concrete aggregate to meet engineering construction need.
Description
Technical field
The present invention relates to aggregate alkali-silica active reaction braking measure, particularly the method for evaluation effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate.
Background technology
At present, multinomial hydroelectric projects such as power station, China oriented family dam, three plate stream power stations, silk screen power station have successively been carried out the work of prevention concrete experimental study on alkali-aggregate reaction.The experimental study achievement shows: take to use low alkali cement (effective alkali Na
2O content≤0.60%), in concrete, mixes the measure that can consume the various control concrete total alkali contents such as admixture of effective alkali in the concrete and all can obviously suppress the active reaction of aggregate alkali-silica.
The active reaction of aggregate alkali-silica mainly shows as alkali-aggregate reaction product generation harmfulness expansion and causes concrete cracking the influence of concrete durability.The way that the prophylactic activity aggregate concrete is destroyed by alkali-silica reaction is exactly to take measure safely and effectively to suppress the generation of aggregate alkali active reaction, and concrete expansivity is controlled in the safe range value.
Along with the continuous development of China's engineering construction cause, increasing concrete works will run into and have potential hazard reactive activity aggregate.In order to reduce construction costs, increasing engineering will adopt effective this technology path of inhibition aggregate alkali active reaction, has the aggregate of alkali-silica active reaction near use engineering under the prerequisite that takes preventive measures.The phenomenon that the active reaction of aggregate alkali-silica damages concrete works generally will just show after engineering is built up decades.
The concrete for hydraulic structure engineering is concerning project of vital and lasting importance, and engineering must high standard, tight requirement, and it is perfectly safe to accomplish.In case occur breakoff phenomenon with serious threat to the country and people's the security of the lives and property, cause enormous economic loss to engineering.The braking measure how to be adopted by the research technique checking engineering is safely and effectively, and countries in the world are all among research at present.
Inhibition aggregate basic active potency test method among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", be to make mortar specimen (being standard specimen) with highly active quartz glass sand and high-alkali cement (alkalinity 1.0%), with the mortar specimen (promptly contrasting test specimen) of mixing and suppress material, put into maintenance in 40 ℃ of water vapor fog rooms simultaneously, carry out same expansivity comparison in the length of time, to weigh the inhibition usefulness that suppresses with material.Its evaluation criteria is:
---(75% is the used cement of standard specimen with admixture to mixing, 25% is admixture) or the contrast test specimen of additive, if 14d (my god) length of time mortar expansion rate reduced rate Re be not less than 75%, and 56d (my god) expansivity less than 0.05%, think that then the admixture mixed or additive and corresponding volume thereof have the usefulness that suppresses the aggregate alkali active reaction;
---to the contrast test specimen of cement making selected on the engineering, except that satisfy 14d (my god) length of time mortar expansion rate reduced rate Re be not less than 75% require, contrast test specimen 14d (day) length of time expansivity also must not can think that just this cement can not produce harmful alkali-aggregate expansion greater than 0.02%.
The limitation of this evaluation criteria mainly shows following 2 aspects:
(1) check of this method is the inhibition usefulness of a certain inhibition material (admixture or additive or cement), use be raw material ratio with a kind of high activity bone material (quartz glass sand), same mortar, the reactive aggregates that uses with engineering does not connect;
(2) in actual engineering, its active height of the reactive aggregates of different cultivars is different, its raw material ratio difference of mortar or concrete, the quantity that reaches the needed inhibition material of safe and effective inhibition effect also there is no fear of identical, the inhibition usefulness that adopts the admixture of 25% volume to evaluate it also is incomplete, some concrete does not allow to mix 25% admixture, and how does this evaluate its inhibition usefulness?
Based on above-mentioned situation, the general test method that suppresses aggregate alkali active reaction study on the efficiency now in the world is the mensuration of carrying out engineering concrete sample expansivity, and this method test is long the length of time, generally takes 2～3 years.This is difficult to satisfy for common engineering in time.Therefore, press for the expansivity that accelerated test procedures that the actual engineering reactive aggregates of a kind of usefulness carries out is measured, the expansivity of measuring with actual engineering reactive aggregate concrete test specimen long-age compares, check and evaluate the braking measure validity of concrete alkali aggregate reaction, to satisfy the needs of engineering construction.
Summary of the invention
Technical matters to be solved by this invention is, at the prior art deficiency, a kind of method of evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate is provided, the feasible validity check that can carry out aggregate alkali-silica active reaction braking measure with reference to the mortar bars express method of aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", the evaluation of determining one group of this method for quickly detecting is worth the validity of evaluating aggregate alkali-silica active reaction braking measure, to substitute aggregate alkali-active reaction braking measure validity check method that actual engineering concrete sample long-age expansivity is measured, to satisfy the needs of engineering construction.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of method of evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate, it comprises the following steps:
1. use actual engineering reactive aggregates and effective alkali Na
2O content is less than or equal to 0.60% low alkali cement or effective alkali Na
2O content is 0.90% ± 0.1% high-alkali cement fly ash moulding mortar specimen;
2. mortar specimen is positioned over to soak in 80 ℃ of water and measured base length in 24 hours;
3. if with effective alkali Na
2O content is less than or equal to the mortar specimen of 0.60% low alkali cement moulding, then mortar specimen is immersed in temperature and is in 80 ℃ and the concentration Celsius NaOH solution identical and carry out maintenance with mortar specimen hole solution alkali concn, measure the 14d expansivity of mortar specimen, if the 14d expansivity is greater than 0.040%, then this braking measure is invalid; If the 14d expansivity is equal to or less than 0.040%, then this braking measure is effective;
4. if with effective alkali Na
2O content is the mortar specimen of 0.90% ± 0.1% high-alkali cement fly ash moulding, then mortar specimen is immersed in temperature and is in the NaOH solution that 80 ℃ and concentration Celsius are 1mol/L and carry out maintenance, measure the 14d expansivity of this mortar specimen, if the 14d expansivity is greater than 0.050%, then this braking measure is invalid; If the 14d expansivity is equal to or less than 0.050%, then this braking measure is effective.
Compared with prior art, the beneficial effect that the present invention had is: the present invention is with reference to mortar bars express method (the 400g Binder Materials of aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio), with actual engineering reactive aggregates moulding low alkali cement and high-alkali cement fly ash mortar specimen, and determine: if moulding is the low alkali cement mortar specimen, then mortar specimen is immersed in temperature and is in 80 ℃ and the concentration Celsius NaOH solution identical and carry out maintenance with mortar specimen hole solution alkali concn, measure the 14d expansivity of mortar specimen, if the 14d expansivity is greater than 0.040%, then this braking measure is invalid; If the 14d expansivity is equal to or less than 0.040%, then this braking measure is effective; If moulding is high-alkali cement fly ash mortar specimen, then mortar specimen is immersed in temperature and is in the NaOH solution that 80 ℃ and concentration Celsius are 1mol/L and carry out maintenance, measure the 14d expansivity of this mortar specimen, if the 14d expansivity greater than 0.050%, then this braking measure is invalid; If the 14d expansivity is equal to or less than 0.050%, then this braking measure is effective.But like this with regard to the mortar specimen expansivity of fast measuring with the moulding of actual engineering reactive aggregates, and the braking measure validity of check and evaluation concrete alkali aggregate reaction, to satisfy the needs of engineering construction.
Embodiment
Embodiment 1: with reference to mortar bars express method (the 400g Binder Materials of aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio), with three plate stream power station sandstone artificial sands and low alkali cement (effective alkali Na2O content≤0.60%) moulding mortar bars express method test specimen, test specimen is positioned over 24 hours mensuration bases of immersion length in 80 ℃ of water, then test specimen is soaked in temperature and is 80 ℃ and (soak maintenance in the identical NaOH solution of NaOH concentration≤0.41mol/L), Celsius by the different expansivitys of measuring test specimen the length of time respectively with mortar specimen hole solution alkali concn.
Simultaneously, mortar bars express method (400g Binder Materials with reference to aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio), with three plate stream power station sandstone artificial sands and high-alkali cement (effective alkali Na2O content=0.90% ± 0.1%) fly ash (adopting the Kerry ash among this embodiment) moulding mortar bars express method test specimen, test specimen is positioned over 24 hours mensuration bases of immersion length in 80 ℃ of water, then test specimen is soaked in temperature and is in the NaOH solution that 80 ℃ and concentration Celsius are 1mol/L and soak maintenance, by the different expansivitys of measuring test specimen the length of time respectively.
The Pyatyi of above-mentioned use low alkali cement or high-alkali cement fly ash and three plate stream power station sandstone artificial sand moulding is joined sand mortar test specimen expansivity measurement result and is seen Table 1.
Table 1 three plate stream power station Pyatyis are joined sand mortar test specimen expansivity measurement result
As known from Table 1:
---using low alkali cement (effective alkali Na
2O content≤0.60%) under the situation, this sandstone mortar bars express method test specimen (400g Binder Materials, five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio) is that the 14d expansivity that mortar specimen hole solution (NaOH concentration is 0.41mol/L) Celsius 80 ℃ soaks under the curing condition is 0.017% in temperature, and find by Micro-Structure Analysis to this test specimen, the alkali-aggregate reaction of harmfulness does not take place in this inside concrete, and promptly this braking measure is safe and effective;
---at high-alkali cement (effective alkali Na
2When mixing 20% flyash O content=0.90% ± 0.1%), this sandstone mortar bars express method test specimen is that 80 ℃ and concentration Celsius are 0.042% for the 14d expansivity that 1mol/LNaOH solution soaks under the curing condition in temperature, and find by Micro-Structure Analysis to this test specimen, the alkali-aggregate reaction of harmfulness does not take place in this inside concrete, and promptly this braking measure is safe and effective.
Embodiment 2: with reference to mortar bars express method (the 400g Binder Materials of aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio), with the last five stream power station sandstone artificial sand and low alkali cement (effective alkali Na2O content≤0.60%) moulding mortar bars express method test specimen, test specimen is positioned over 24 hours mensuration bases of immersion length in 80 ℃ of water, then test specimen is soaked in temperature and is 80 ℃ and (soak maintenance in the identical NaOH solution of NaOH concentration≤0.41mol/L), Celsius by the different expansivitys of measuring test specimen the length of time respectively with mortar specimen hole solution alkali concn.
Simultaneously, mortar bars express method (400g Binder Materials with reference to aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio), with the last five stream power station sandstone artificial sand and high-alkali cement (effective alkali Na2O content=0.90% ± 0.1%) fly ash (adopting Zhuzhou ash and Kerry ash among this embodiment) moulding mortar bars express method test specimen, test specimen is positioned over 24 hours mensuration bases of immersion length in 80 ℃ of water, then test specimen is soaked in temperature and is in the NaOH solution that 80 ℃ and concentration Celsius are 1mol/L and soak maintenance, by the different expansivitys of measuring test specimen the length of time respectively.
The Pyatyi of above-mentioned use low alkali cement or high-alkali cement fly ash and the sandstone artificial sand moulding of the last five stream power station is joined sand mortar test specimen expansivity measurement result and is seen Table 2.
Table 2 the last five stream power station Pyatyi is joined sand mortar test specimen expansivity measurement result
As known from Table 2:
---using low alkali cement (effective alkali Na
2O content≤0.60%) under the situation, the last five small stream sandstone mortar bars express method test specimen is that (the 14d expansivity of soaking under the curing condition in the NaOH concentration≤0.41mol/L) is 0.017%～0.018% for 80 ℃ and mortar hole solution Celsius in temperature, and find by Micro-Structure Analysis to this test specimen, the alkali-aggregate reaction of harmfulness does not take place in this inside concrete, and promptly this braking measure is safe and effective;
---at high-alkali cement (effective alkali Na
2When mixing 20% flyash O content=0.90% ± 0.1%), the last five small stream sandstone mortar bars express method test specimen is that 80 ℃ and concentration Celsius are that the 14d expansivity of soaking under the curing condition in the 1mol/LNaOH solution is 0.042%～0.045% in temperature, and find by Micro-Structure Analysis to this test specimen, the alkali-aggregate reaction of harmfulness does not take place in this inside concrete, and promptly this braking measure is safe and effective.
Embodiment 3: mix 5% high activity vitreous aggregate with the last five small stream sandstone and dispose artificial reactive aggregates, mortar bars express method (400g Binder Materials with reference to aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio), with this artificial reactive aggregates and low alkali cement (effective alkali Na2O content≤0.60%) moulding mortar bars express method test specimen, test specimen is positioned over 24 hours mensuration bases of immersion length in 80 ℃ of water, then test specimen is soaked in temperature and is 80 ℃ and (soak maintenance in the identical NaOH solution of NaOH concentration≤0.41mol/L), Celsius by the different expansivitys of measuring test specimen the length of time respectively with mortar specimen hole solution alkali concn.
Simultaneously, mortar bars express method (400g Binder Materials with reference to aggregate basic active test among the existing DL/T5151-2001 " concrete for hydraulic structure sandstone aggregate testing regulations ", five graded sands, 1: 2.25 cement-sand ratio, 0.47 water cement ratio), with artificial reactive aggregates and high-alkali cement (effective alkali Na2O content=0.90% ± 0.1%) fly ash (adopting the Zhuzhou ash among this embodiment) moulding mortar bars express method test specimen, test specimen is positioned over 24 hours mensuration bases of immersion length in 80 ℃ of water, then test specimen is soaked in temperature and is in the NaOH solution that 80 ℃ and concentration Celsius are 1mol/L and soak maintenance, by the different expansivitys of measuring test specimen the length of time respectively.
Above-mentioned use low alkali cement or high-alkali cement fly ash are joined sand mortar test specimen expansivity measurement result with the Pyatyi of artificial reactive aggregates moulding and are seen Table 3.
The artificial reactive aggregates Pyatyi of table 3 is joined sand mortar test specimen expansivity measurement result
Join sand mortar test specimen expansivity measurement result as can be known from the artificial reactive aggregates Pyatyi of table 3:
---for mixing the vitreous artificial reactive aggregates of 5% high activity, though low alkali cement mortar specimen 14d expansivity in the length of time is starkly lower than the high-alkali cement mortar specimen, but still have 0.140%～0.206%, it is the expansion that mortar specimen has still produced harmfulness, and along with the continuous prolongation of curing age, low alkali cement mortar specimen expansivity even exceed the high-alkali cement mortar specimen.So, can not take the maintenance method of mortar hole solution immersion to use the validity check of low alkali cement braking measure to mixing the vitreous artificial reactive aggregates of 5% high activity, promptly low alkali cement (effective alkali Na is used in check with reference to the mortar bars express method
2O content≤0.60%) validity of braking measure is inapplicable for mixing the vitreous artificial reactive aggregates of 5% high activity;
---for mixing the vitreous artificial reactive aggregates of 5% high activity, at high-alkali cement (effective alkali Na
2When mixing 25% flyash O content=0.90% ± 0.1%), corresponding mortar bars express method test specimen is that the 14d expansivity of soaking under the curing condition in the 1mol/LNaOH solution is 0.042%～0.045% 80 ℃ of concentration, find by Micro-Structure Analysis this test specimen, the alkali-aggregate reaction of harmfulness does not take place in this inside concrete, promptly takes at high-alkali cement (effective alkali Na
2O content=0.90% ± 0.1%) mixes the braking measure of 25% flyash in, can suppress to mix the alkali-silica active reaction of the artificial reactive aggregates of the 5% high activity vitreous safely and effectively.
Claims (1)
1, a kind of method of evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate is characterized in that comprising the following steps:
1. use actual engineering reactive aggregates and effective alkali Na
2O content is less than or equal to 0.60% low alkali cement or effective alkali Na
2O content is 0.90% ± 0.1% high-alkali cement fly ash moulding mortar specimen;
2. mortar specimen is positioned over to soak in 80 ℃ of water and measured base length in 24 hours;
3. if with effective alkali Na
2O content is less than or equal to the mortar specimen of 0.60% low alkali cement moulding, then mortar specimen is immersed in temperature and is in 80 ℃ and the concentration Celsius NaOH solution identical and carry out maintenance with mortar specimen hole solution alkali concn, measure the 14d expansivity of mortar specimen, if the 14d expansivity is greater than 0.040%, then this braking measure is invalid; If the 14d expansivity is equal to or less than 0.040%, then this braking measure is effective;
4. if with effective alkali Na
2O content is the mortar specimen of 0.90% ± 0.1% high-alkali cement fly ash moulding, then mortar specimen is immersed in temperature and is in the NaOH solution that 80 ℃ and concentration Celsius are 1mol/L and carry out maintenance, measure the 14d expansivity of this mortar specimen, if the 14d expansivity is greater than 0.050%, then this braking measure is invalid; If the 14d expansivity is equal to or less than 0.050%, then this braking measure is effective.
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| CN102565311A (en) * | 2011-12-27 | 2012-07-11 | 水利部交通运输部国家能源局南京水利科学研究院 | Test method for evaluating actual risk of alkali-aggregate reaction of hydraulic concrete |
| CN103235112A (en) * | 2013-04-26 | 2013-08-07 | 西南交通大学 | Test method for evaluating inhibition availability of inhibition material to alkali-aggregate reaction |
| CN103353518A (en) * | 2013-06-27 | 2013-10-16 | 湖南大学 | Design method of ternary component cementing material for inhibiting alkali-aggregate reaction |
| CN103992052A (en) * | 2014-05-17 | 2014-08-20 | 安徽水利开发股份有限公司 | Method for inhibiting alkali activity of cement concrete |
| CN105004655A (en) * | 2015-08-07 | 2015-10-28 | 辽宁省水利水电勘测设计研究院 | Real-time measurement device for alkali aggregate active reaction |
| CN106198394A (en) * | 2016-06-29 | 2016-12-07 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of microcosmic judges the method for aggregate basic active |
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| CN112098583A (en) * | 2020-09-26 | 2020-12-18 | 吉林建筑大学 | Method for rapidly identifying alkali active aggregate |
| CN113009118A (en) * | 2021-03-01 | 2021-06-22 | 中铁检验认证中心有限公司 | Method for evaluating damage risk of alkali aggregate reaction of concrete structure |
| CN114459986A (en) * | 2022-03-23 | 2022-05-10 | 内蒙古科技大学 | Concrete alkali silicate reaction life prediction method based on rapid mortar rod method |
| CN114778804A (en) * | 2022-02-24 | 2022-07-22 | 海南绿峰资源开发有限公司 | Detection method of concrete alkali-active aggregate |
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| CN102565311A (en) * | 2011-12-27 | 2012-07-11 | 水利部交通运输部国家能源局南京水利科学研究院 | Test method for evaluating actual risk of alkali-aggregate reaction of hydraulic concrete |
| CN102565311B (en) * | 2011-12-27 | 2015-07-15 | 水利部交通运输部国家能源局南京水利科学研究院 | Test method for evaluating actual risk of alkali-aggregate reaction of hydraulic concrete |
| CN103235112A (en) * | 2013-04-26 | 2013-08-07 | 西南交通大学 | Test method for evaluating inhibition availability of inhibition material to alkali-aggregate reaction |
| CN103353518A (en) * | 2013-06-27 | 2013-10-16 | 湖南大学 | Design method of ternary component cementing material for inhibiting alkali-aggregate reaction |
| CN103992052A (en) * | 2014-05-17 | 2014-08-20 | 安徽水利开发股份有限公司 | Method for inhibiting alkali activity of cement concrete |
| CN105004655A (en) * | 2015-08-07 | 2015-10-28 | 辽宁省水利水电勘测设计研究院 | Real-time measurement device for alkali aggregate active reaction |
| CN106198394A (en) * | 2016-06-29 | 2016-12-07 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of microcosmic judges the method for aggregate basic active |
| CN110333316A (en) * | 2019-07-16 | 2019-10-15 | 吴云 | One kind is for judging gather materials containing the slate active concrete microtrabeculae test specimen of alkali_silica reaction and its preparation and application |
| CN112098583A (en) * | 2020-09-26 | 2020-12-18 | 吉林建筑大学 | Method for rapidly identifying alkali active aggregate |
| CN113009118A (en) * | 2021-03-01 | 2021-06-22 | 中铁检验认证中心有限公司 | Method for evaluating damage risk of alkali aggregate reaction of concrete structure |
| CN114778804A (en) * | 2022-02-24 | 2022-07-22 | 海南绿峰资源开发有限公司 | Detection method of concrete alkali-active aggregate |
| CN114778804B (en) * | 2022-02-24 | 2023-10-27 | 海南绿峰资源开发有限公司 | Method for detecting alkali-activated aggregate of concrete |
| CN114459986A (en) * | 2022-03-23 | 2022-05-10 | 内蒙古科技大学 | Concrete alkali silicate reaction life prediction method based on rapid mortar rod method |
| CN114459986B (en) * | 2022-03-23 | 2024-04-05 | 内蒙古科技大学 | Concrete alkali silicate reaction life prediction method based on rapid mortar rod method |
| CN117269461A (en) * | 2023-05-15 | 2023-12-22 | 燕山大学 | Method for rapidly detecting alkali aggregate reaction of seawater concrete |
| CN117269461B (en) * | 2023-05-15 | 2024-04-09 | 燕山大学 | Method for rapidly detecting alkali aggregate reaction of seawater concrete |
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Owner name: CHINA POWER GROUP ZHONGNAN INVESTIGATION DESIGN + Free format text: FORMER NAME: ZHONGNAN PROSPECTING DESIGN INST. CHINA HYDRAUELECTRIC CONSULTANT GROUP |
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Address after: 410014 Hunan province Changsha Yuhua District, camphor Road No. 16 Patentee after: Company limited of Central-South survey and design research institute of electricity Jian group of China Address before: 410014, 9 camphor Road, Yuhua District, Hunan, Changsha Patentee before: Zhongnan Prospecting Design Inst. China Hydrauelectric Consultant Group |