RILEM Recommended Test Method AAR-0: Detection of Alkali-Reactivity Potential in Concrete—Outline guide to the use of RILEM methods in assessments of aggregates for potential alkali-reactivity

Sims, Ian; Nixon, P J

doi:10.1007/bf02481527

Cited by 33 publications

(13 citation statements)

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“…Stanton also proposed a test method, which later evolved into the mortar bar test (ASTM C227 [15]), to evaluate the potential reactivity of cementaggregate combinations. Since the 1940s, research has been primarily focused on (a) understanding the reaction mechanisms [1,[16][17][18], (b) developing rapid and reliable test methods to identify reactive minerals and aggregates [19][20][21], (c) predicting the long-term performance of concrete mixtures in service [22][23][24], and (d) proposing and evaluating effective methods to mitigate ASR in new or existing structures [8,25,26].…”

Section: Introductionmentioning

confidence: 99%

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Rajabipour

Giannini

Dunant

et al. 2015

Cement and Concrete Research

433

197

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Section: Introductionmentioning

confidence: 99%

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Rajabipour

Giannini

Dunant

et al. 2015

Cement and Concrete Research

433

197

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“…Sche mat oce ny re ak tyw no ści kru szyw we dług norm pol skich [7] Fi g. 3. In te gra ted as ses sment sche me by RI LEM [17] Ry s. 3. Zin te gro wa ny sys tem oce ny we dług RI LEM [17] …”

Section: Astm Methodsunclassified

“…In te gra ted as ses sment sche me by RI LEM [17] Ry s. 3. Zin te gro wa ny sys tem oce ny we dług RI LEM [17] …”

Section: Astm Methodsmentioning

confidence: 99%

Determining the reactivity of concrete aggregates for Nuclear Power Plant concrete structures

Jackiewicz-Rek

Piotrowski

Courard

et al. 2016

CONSTRUCTION MATERIALS

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Con cer ning du ra bi li ty of the NPP ci vil en gi ne ering con crete struc tu res, ac cor ding to RCC -CW [16], the ma in objec ti ves are to:• pre vent in ter nal di sor ders re sul ting from Al ka li Si li ca Re ac tion (ASR) and De lay ed Et trin gi te For ma tion (DEF);• re du ce and/or pre vent crac king of con cre te and cor ro sion of ste el re in force ment and• con trol cre ep of con cre te. Al ka li -Ag gre ga te Re ac tions (AAR) may in vo lve si li ce ous ag gre ga tes (alka li -si li ca re ac ti vi ty, ASR) or very rare car bo na te ag gre ga tes (al ka li -car bo nate re ac ti vi ty, ACR), and fa ilu re to ta ke pre cau tions may re sult in pro gres si ve de te rio ra tion of con cre te struc tu res. AAR a re che mi cal re ac tions that oc cur betwe en cer ta in ty pes of mi ne ral in ag grega tes and the al ka li ne (Na+ and K+) and hy dro xyl (OH -) ions pre sent in the in ter sti tial so lu tion of ce ment pa ste in con cre te. The se dis so lu tion re ac tions oc cur due to the high so lu bi li ty in very alcaline solutions of cer ta in amor phous, di sor de red or po or ly cry stal li zed forms of si li ca. This re ac tion le ads to for ma tion of a hy gro sco pic al ka li ne gel that ab sorbs wa ter and expands, causing si gni fi cant expan sion and cha racte ri stic crac king of the con cre te. The ra te of expan sion cau sed by AAR ty pical ly has be en fo und to be 20 to 200 x 10 -6 mm/mm per year [1], de pen ding on the se ve ri ty of the re ac tion and the de gree of re stra int. The expan sion beco mes de tec ta ble in abo ut fi ve to ten years after con struc tion, and the most no ti ce able expan sion may be de tec ted in abo ut 15 to 25 years.The three pre re qu isi tes must be simul ta ne ously ful fil led for AAR expansion to oc cur: high con tent of al ka li in con cre te (usually ≥ 3 kg/m 3 ), pre sen ce of re ac ti ve mi ne rals in ag gre ga te and suf fi cient mo istu re sup ply (at le ast 80%). If any one of the se three con di tions is not met, expan sion due to AAR can not oc cur. Other con di tions, such as hi gher tem pe ra tu re, ac ce le ra te the spe ed of reac tion. ASR in vo lves a che mi cal re action, and for the re ac tion to oc cur, the follo wing com po nents must be pre sent: wa ter, re ac ti ve si li ca, and a high con centra tion of hy dro xyl ions -high pH [1]. Li ke wi se, the con cen tra tion and di stribu tion of the se com po nents and the am bient tem pe ra tu re ha ve a si gni fi cant in flu en ce on the ra te and de le te rio us ef fect of the re ac tion. A con cre te structu re with ASR com mon ly exhi bits wi dely dif fe ring si gns of de te rio ra tion in diffe rent pla ces. Con cre te expo sed to dry, in te rior envi ron ments wi tho ut wa ter nor mal ly do es not de ve lop crac king from ASR and the most vul ne ra ble parts of a con cre te struc tu re are tho se expo sed to a warm and hu mid envi ronment [1].In the absence of previous long-term experience EN 12620 [14] suggests to take one of the following precautions:■ limit the total alkali co...

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“…Betono atsparumas šalčiui nustatytas vadovaujantis LST L 142817:2016 standarto reikalavimais. Betono bandinių šarminės korozijos tyrimai atlikti pagal Sims, Nixon (2003) rekomendacijas. Betono bandiniai (prizmės -40×40×160 mm) formuoti specialiose formose, bandinių galuose įtvirtinus atsparius šarmų poveikiui metalinius reperius.…”

Section: šAlčio Atsparumo Ir šArminės Korozijos Tyrimaiunclassified

Mechanical Properties of Lightweight Concrete Produced with Expanded Glass Aggregate

Rumsys

Bačinskas

Spudulis

2017

Science - Future of Lithuania

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2017 © Straipsnio autoriai. Leidėjas VGTU leidykla "Technika". Šis straipsnis yra atvirosios prieigos straipsnis, turintis Kūrybinių bendrijų (Creative Commons) licenciją (CC BY-NC 4.0), kuri leidžia neribotą straipsnio ar jo dalių panaudą su privaloma sąlyga nurodyti autorių ir pirminį šaltinį. Straipsnis ar jo dalys negali būti naudojami komerciniams tikslams. 1) natūralieji užpildai (pemza ir vulkaninės kilmės šlako nuolaužos); 2) natūralios medžiagos (perlitas, vermikulitas, molis, metamorfinės kilmės skalūnas, nuosėdinės kilmės skalūnas ir t. t.); 3) pramoniniai produktai arba šalutiniai produktai (stiklas, plastikai arba pelenai); 4) pramoniniai šalutiniai produktai (sutrinti kuro pelenai, uolienų šlakas arba metalo šlakas). Kadangi natūralūs užpildai randami tik kai kuriose pasaulio vietose, jie nėra plačiai naudojami lengvojo betono gamybai. Tačiau, juos panaudojus, galima pagaminti gerą, vidutinio stiprumo betoną (Mehta, Monteiro 2006 , o gniuždomasis 40×40×40 mm kubelių stipris -nuo 40 iki 103 MPa. Gautas lengvojo betono stiprio ir tankio priklausomybės grafikas, analizuotas lengvųjų dalelių pasiskirstymas bandinyje, atlikti kraštutinių bandinių atsparumo šalčiui ir šarminei korozijai tyrimai. MOKSLAS -LIETUVOS ATEITIS SCIENCE -FUTURE OF LITHUANIAReikšminiai žodžiai: lengvasis betonas, lengvasis užpildas, stiklo granulės, mechaninės savybės, gniuždomasis stipris, lenkiamasis stipris, atsparumas šalčiui, šarminė korozija.

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RILEM Recommended Test Method AAR-0: Detection of Alkali-Reactivity Potential in Concrete—Outline guide to the use of RILEM methods in assessments of aggregates for potential alkali-reactivity

Cited by 33 publications

References 0 publications

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Determining the reactivity of concrete aggregates for Nuclear Power Plant concrete structures

Mechanical Properties of Lightweight Concrete Produced with Expanded Glass Aggregate

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