EP3903101A1 - Procédé de contrôle permettant de déterminer le potentiel de risque pour la réaction alcali-silice dans des matériaux de construction minéraux - Google Patents

Procédé de contrôle permettant de déterminer le potentiel de risque pour la réaction alcali-silice dans des matériaux de construction minéraux

Info

Publication number
EP3903101A1
EP3903101A1 EP19832401.4A EP19832401A EP3903101A1 EP 3903101 A1 EP3903101 A1 EP 3903101A1 EP 19832401 A EP19832401 A EP 19832401A EP 3903101 A1 EP3903101 A1 EP 3903101A1
Authority
EP
European Patent Office
Prior art keywords
concrete
alkali
test
sample
akr
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19832401.4A
Other languages
German (de)
English (en)
Inventor
Sebastian Dittrich
Volker Thome
Severin SEIFERT
Miriam Wolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP3903101A1 publication Critical patent/EP3903101A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0635—Risk analysis of enterprise or organisation activities
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/65—Raman scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
    • G01N33/383—Concrete or cement
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/08—Construction

Definitions

  • the invention relates to a test method for determining the hazard potential of an alkali-silica reaction (AKR) in mineral building materials such as concrete.
  • ARR alkali-silica reaction
  • Concrete is one of the most important construction materials in the world. In general, concrete has a high durability, which in some cases, however, is due to a
  • AK gel alkali-silica gel
  • the German Committee for Reinforced Concrete e.V. has an alkali guideline for the control or examination of the building material concrete in 1974 with a view to an AKR with the title "Preventive measures against damaging alkali reaction in concrete"
  • Appendix B of the DAfStb guideline describes a quick test procedure known as a mortar test. A long-term test method (concrete test) is also described. So far the assessment of
  • test specimens are examined at predetermined time intervals, as described in connection with FIG. 10. The application of the
  • Page 73-78, BTU Cottbus, Eigenverlag, ISSN-No .: 0947 - 6989 describes another known test method, the BTU-SP quick test from the BTU Cottbus.
  • This rapid test shown in FIG. 11 is a direct test method on aggregates for examining the sensitivity to alkali. Part of the solution is removed during storage for 14 days in a KOH solution at elevated temperature. Solution analyzes are carried out from which the excess silica is calculated. In addition to the excess of silica, the open porosity of the
  • JP 0273156 A discloses a test of an alkali aggregate to evaluate the alkali-silica reactivity of the
  • EP 2 397 848 A1 discloses an automatic measurement method and a device for continuous strain measurement on artificially weathered test specimens under simulated ones
  • measuring method is adapted to the influence of the alkali-silica reaction provoking storage
  • JP 2008 230882 A discloses to use a fine aggregate for concrete or mortar, which is classified as harmless when testing the alkali aggregate reaction according to the alkali-silicon dioxide reactivity test methods according to JIS A 1145 and JIS A 1146.
  • WO 14 171902 A1 discloses a mortar rod testing device and a test method in which the change in length of the alkali-silica reaction which occurs on the concrete samples used in the construction industry is observed.
  • the invention is therefore based on the object of specifying a simple and fast method which can provide good predictions for the sensitivity of the concrete to the alkali-silica reaction.
  • a test method for determining the hazard potential for an alkali-silica reaction in mineral building materials such as For example, concrete is specified, which comprises the following steps: a) Examination of a sample by means of Raman spectroscopy for the structural characterization of the sample, b) Comparison of the examination result with that in
  • a great advantage of the method according to the present invention over the known methods is that the method according to the invention requires little effort and that the result as to whether or not there is an AKR potential of the aggregate being examined is available after only a few minutes.
  • Crystallinity of the aggregates has a significant influence on the solubility of silicate and thus on the damage potential of an AKR.
  • the structure or the chemical composition of the AK gels in turn has a major influence on the swelling behavior of the gels and can therefore also be used to classify the sensitivity to aggregates of aggregates.
  • Database stored values include.
  • the sample to be examined can be a
  • Starting material of the concrete mixture for the preparation of the concrete be or include.
  • the starting material can be or comprise an aggregate.
  • the sample to be examined can be or comprise a reaction product formed in the concrete.
  • the reaction product can be or comprise an alkali-silica gel (AK gel).
  • the sample to be examined can be subjected to a dissolution test before the examination.
  • the release attempt can be carried out for at least 3 weeks.
  • the dissolution test can be carried out at a temperature of more than 60 ° C.
  • the dissolution test can be carried out at a temperature of more than 70 ° C.
  • the dissolution test can be carried out at a temperature of more than 75 ° C.
  • the dissolution test can be carried out at a temperature of approximately 80 ° C.
  • the dissolution test can be carried out at a temperature of less than 95 ° C.
  • the dissolution test can be carried out at a temperature of less than 90 ° C.
  • the dissolution test can be carried out at a temperature of less than 85 ° C.
  • the duration can vary depending on the temperature of the dissolution attempt. For example, a duration of 2 weeks can be selected at a temperature of 80 ° C.
  • the solution product can be or comprise an AK gel, which is characterized by means of Raman spectroscopy, in order to classify the hazard potential of the sample.
  • the solvent can be or comprise K / NaOH.
  • the solvent can be or comprise 1 mol K / NaOH.
  • Portlandite Ca (OH) 2 can be added to the K / NaOH solution.
  • the K / NaOH solution can be present without adding Portlandite.
  • Raman spectroscopy can be used as an AKR test method for classifying the alkali sensitivity of
  • the AKR test can be based on the structural examination of the starting materials (aggregate) and / or the emerging ones
  • Raman spectroscopy can measure amorphous AK gels present in mortar samples, concrete samples or in solution, and also measure amorphous to crystalline aggregates and structurally characterize them.
  • the measured Raman spectra are evaluated to classify the AKR damage potential by comparing these spectra with a previously created, dedicated database.
  • Raman spectroscopy can provide new, important insights into AKR and improve the assessment of an AKR risk. It can also have another represent a preventive measure against an AKR. This can increase the useful life of concrete and raw materials
  • this invention could be used in the building materials industry, such as construction companies and raw material suppliers (e.g.
  • Raman spectroscopy using a database enables a faster, more efficient and simplified procedure for testing the AKR risk.
  • the use of this test method according to the invention can not only close some of the previous gaps in knowledge about AKR, but also improve the energy balance and enable the saving of raw materials and, overall, extend the useful life of concrete.
  • Raman spectroscopy can be used for the pure characterization of AK gels or aggregates and not as a preventive measure / test method. This information can be used to indirectly indicate the AKR damage potential, for example
  • Fig. 2 shows the evaluation of the vibration bands of the
  • Fig. 3 shows the evaluation of the vibration bands of the
  • Embodiment of the invention of a synthesized potassium silicate gel Embodiment of the invention of a synthesized potassium silicate gel.
  • Fig. 5 shows the evaluation of the vibration bands of the
  • Fig. 6 shows the evaluation of the vibration bands of the
  • Fig. 7 shows Raman spectra according to embodiments of the invention of various mineral grains of the examined aggregates using the example of Grauwacke.
  • Fig. 8 shows a Raman spectrum according to the embodiment
  • FIG. 9 shows Raman spectra according to exemplary embodiments of the invention of various mineral grains of the examined aggregates using the example of Opal & Flintsandstein.
  • Fig. 12 shows the schematic flow of a
  • Raman spectroscopy is used as an AKR test method for classifying the alkali sensitivity of
  • the AKR test is based on the structural examination of the raw materials
  • Raman spectroscopy can measure and structurally characterize both amorphous AK gels in mortar, concrete samples or in solution as well as amorphous to crystalline aggregates. The evaluation of the measured
  • Raman spectra to classify the AKR damage potential are based on the comparison of these spectra with a previously created, dedicated database.
  • the solution product (AK gel) was then characterized by Raman spectroscopy, as shown in FIGS. 1 to 3.
  • the attempt to dissolve includes the storage of fine-grained aggregates
  • the attempt to dissolve can also be made without adding
  • Alkaline sensitivity of the aggregate can be closed.
  • a high degree of silicate linkage (Q4) correlates with a high AKR resistance.
  • the determined image of the vibration bands is compared to a database in which previously performed
  • This exemplary embodiment thus shows that the AKR hazard potential can be determined using the classification of the alkali sensitivity of aggregates.
  • Aggregates can be determined.
  • FIGS. 4 to 6 show a Raman spectroscopy of a synthesized potassium silicate gel, as it could occur in mortar / concrete samples.
  • the gel was examined by means of Raman spectroscopy and structurally characterized using the vibration bands shown in FIGS. 5 and 6. Based on the determined composition and structure, the AKR risk can be determined by comparison with a previously created database. It should be borne in mind that the maximum
  • the gel can come directly from a concrete sample.
  • Raman spectroscopy according to the method according to the invention can be used to detect and structurally characterize AK gels.
  • An AKR hazard potential can be determined by comparing it with a database.
  • the aggregate is structurally characterized by means of
  • the result of the characterization is then correlated with existing test methods (mortar / concrete test methods) by comparing them with a previously created database.
  • the aggregate is in different places
  • the structure of the Si02 minerals is cryptocrystalline, lattice-disturbed or amorphous, it is a quick-reacting aggregate with high
  • Crystalline SiCb minerals are either slowly reactive or not hazardous to AKR.
  • the transition area between AKR-endangering and non-AKR-endangering aggregates is determined based on the correlation with existing test methods.
  • FIGS. 10 to 12 show the known methods in comparison with the method according to the invention.
  • step 10 The method according to the DAfStb guideline is shown in FIG.
  • step 10 a concrete sample 11 is shown and its length 1 is measured.
  • step 20 the
  • step 30 the concrete sample is measured again.
  • step 50 the AKR hazard potential is determined based on the change in length. If length 1 decreases or stays the same, there is no AKR hazard potential. If the length 1 increases, there is an AKR hazard potential.
  • steps 70 and 80 the AKR hazard potential can be assessed under certain circumstances using microscopic examinations on fresh cut surfaces of the test specimens 11.
  • FIG. 11 shows the method according to the BTU-SP rapid test.
  • a gel 12 is provided as a sample.
  • the gel is stored for 14 days at pH14 and elevated temperature.
  • the solution is analyzed by determining the silicate solubility.
  • the result gives an assessment of the alkali sensitivity, which is a measure of the AKR hazard potential.
  • a sample 12 is provided.
  • Sample 12 may be an aggregate or a gel.
  • an examination is carried out using Raman spectroscopy. The measurement can usually be carried out in about 10 seconds. The measurement results can then be available almost immediately.
  • the evaluation time is currently approx. 2 minutes.
  • a structural analysis is carried out in step 230.
  • the results are in steps 240, 250 and 260 with a database
  • Silicate solubility can take place according to the results from the method shown in FIG. 11.
  • the AKR hazard potential results from the comparison with the database.
  • the method according to the invention requires little effort and the result as to whether or not there is an AKR potential in the aggregate being examined can be obtained after only a few minutes.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Human Resources & Organizations (AREA)
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  • Biochemistry (AREA)
  • Immunology (AREA)
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  • General Business, Economics & Management (AREA)
  • Medicinal Chemistry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

L'invention concerne un procédé de contrôle permettant de déterminer le potentiel de risque d'une réaction alcali-silice dans des matériaux de construction minéraux comme le béton par exemple. Elle se caractérise par les étapes suivantes : a) analyse (220) d'un échantillon (12) par spectroscopie Raman pour la caractérisation (230) structurelle de l'échantillon (12), b) comparaison (240) des résultats de l'analyse avec des valeurs (250) stockées dans une base de données, et c) utilisation (260) des résultats de la comparaison (240) pour déterminer (270) un potentiel de risque pour le béton pour une réaction alcali-silice.
EP19832401.4A 2018-12-28 2019-12-22 Procédé de contrôle permettant de déterminer le potentiel de risque pour la réaction alcali-silice dans des matériaux de construction minéraux Pending EP3903101A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018251789.4A DE102018251789A1 (de) 2018-12-28 2018-12-28 Prüfverfahren zur Bestimmung des Gefährdungspotentials für Alkali-Kieselsäure-Reaktion in mineralischen Baustoffen
PCT/EP2019/086885 WO2020136152A1 (fr) 2018-12-28 2019-12-22 Procédé de contrôle permettant de déterminer le potentiel de risque pour la réaction alcali-silice dans des matériaux de construction minéraux

Publications (1)

Publication Number Publication Date
EP3903101A1 true EP3903101A1 (fr) 2021-11-03

Family

ID=69137900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19832401.4A Pending EP3903101A1 (fr) 2018-12-28 2019-12-22 Procédé de contrôle permettant de déterminer le potentiel de risque pour la réaction alcali-silice dans des matériaux de construction minéraux

Country Status (5)

Country Link
US (1) US20210319377A1 (fr)
EP (1) EP3903101A1 (fr)
CA (1) CA3124999A1 (fr)
DE (1) DE102018251789A1 (fr)
WO (1) WO2020136152A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220317109A1 (en) * 2020-12-04 2022-10-06 The United States Department of Transportation / Federal Highway Administration Method for the assessment of alkali-silica reactivity of aggregates and concrete mixtures

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0273156A (ja) 1988-09-08 1990-03-13 Tohoku Electric Power Co Inc アルカリ骨材反応試験方法及びその供試体
JP5484655B2 (ja) 2007-03-19 2014-05-07 株式会社デイ・シイ コンクリート或いはモルタルのアルカリ骨材反応抑制方法
DE102010017468B4 (de) 2010-06-18 2013-10-17 Bundesanstalt für Materialforschung und -Prüfung (BAM) Kontinuierliche Dehnungsmessung bei Prüfung des Einflusses der Alkali-Kieselsäure-Reaktion auf Gefügeveränderungen in Betonen
WO2014171902A1 (fr) 2013-04-16 2014-10-23 Hamit Semati Test de réaction alcali-silice, testeur accéléré de barre de mortier et méthodes de test
EA201991461A1 (ru) * 2016-12-14 2019-12-30 Майкл Смит Способы и устройства для оценки содержания материалов
US10830713B2 (en) * 2017-11-20 2020-11-10 DigiM Solution LLC System and methods for computing physical properties of materials using imaging data

Also Published As

Publication number Publication date
WO2020136152A1 (fr) 2020-07-02
DE102018251789A1 (de) 2020-07-02
US20210319377A1 (en) 2021-10-14
CA3124999A1 (fr) 2020-07-02

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