ML20126A208

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Petrographic Rept,Project Examination of Concrete Samples from Facility Containment Bldg Base Mat,Ks
ML20126A208
Person / Time
Site: Wolf Creek Wolf Creek Nuclear Operating Corporation icon.png
Issue date: 07/02/1979
From:
ARMY, DEPT. OF, CORPS OF ENGINEERS
To:
Shared Package
ML20126A095 List:
References
NUDOCS 8002140495
Download: ML20126A208 (7)


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17 6794 25 4860  :- _.

18 6771 28 5410 sa

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19 6752 25 4460 20 6561 28 5650 HR 21 6700 28 4790 $-

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40 6737 90 4520 41 6714 .90 4370 In additien, c 27 June 1979 f rag ents cf f our ircken 90-day cylinders vere receivai a: '25 f or exa ina:ict.

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4. ,Dr. D. E. Campbell of the C :strue ien Technology Laboratories of the, 2 _Es:

FCA is the petrographer who made the pe:rographic exa.mination at the PCA.% s_ .

Ee spe : 19 June and part of 20 June 1979 at 1.'IS as an official cbserver gl and te dis: .ss his :hin see: ions. Part of this time was used to verify that .=_-h there .as acc:rd c: recognition of the varicus phases one vould encount er 5:1

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11. The appearance of the concrete in the f:ag=ents of the f our cylinders & l j

(6 5 !. 6, 6f 57, 6659, 6767) was s'-'lar. The paste was gray vi:h a slight _=.__-;

1 olf e e:-i:> vitrecus luster rather than chalkv, or dull, which is often E_E- i indicative of concrete in coor condition.' -

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12. There was to evidence cf abno cal f eatures such as detricental i alkali-silica c: alkali-carbonate rock reaction in the concrete fragnants. .Ei. .

P.icrescopic a :ents of white, r. orcellanous gel-like caterial vere observed E in one v:id in cylinder 6546* in two voids in cylinder 6557, and in two r voids ': c ; linder 6539. Tcis caterial was so stall that it usually was no: ,=

de:.e: table by the untided eye. Examination of sore of this caterial f ro= n cylinders 65'6 and 6559 in pouder d ersion :oun:s with a polarizing $

21erescope shoved it to be largely amorphous with a ref ractive index belov fl '

l.544 Th's ca trial is alkali-silica gel. I:s presence indicates that h-

.s n ,_.. e . .- . .c. a .c. _ s-c..,.. c e. c- a.c r . . _, 4. - s 4. ,. <. c c. . eace.-.. 4 4

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  • h.a. . i m.' a v. . -

00 11 s re :th :o:::ete. The likelihood of de::icentald alkali-silica e.a.u n. e ,el 4.r i'o l e -

. .a- '. .' a . b . .. .=. ~. a. . o d. . . -". . . '. . . o . c". . +. . 3 .s c. ..s i.' e . e i

sic:e ~.cv-alhali per-land ce en vas used in this ccacrete.* This level

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Ne::her the s::othed ne: -he acid-e:ched surf aces of concrete f rc:

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14. T'.in s e::ic a a::2 r.ina t icn s . The exanination ef the 5 pairs of l thin sec:ic.s represen:ing low- a .3 nor:al-s::ength concrete did no:

reveal signifi:at: dif f ere .:es nor did :he examination of the other 31

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15. The ty;ical thin sec:icn indicated a dense, well consolidated concrete [.
ade v-ith a :anona:e cearse ag;:egate, a natural sand, and portland cement.

i E i No ainix.ures such as fly ash were recognized. The paste was a cix:ure of

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,n a: s ee ed c be appropr, ate .,: arount. _

2 ne calcium s:.,acate . hyc. r a t e :.s i not specifically recognizable by examination of thin sections of contrate r

. althou4-h its prese:::e is readily inferred. The comparative exami. nations E..

e- .

did no: sugses: different amounts of cement or of water between the r i di.'fere.: sz .les. Se e of the thin sections vere carbonated, or small [

areas were tissing, or the ep:xy resin was con:acinated with c:all crystals 5.,

hat crystallized f:c: the resin. These def ects are concen, are no 1=~ l n

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